Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_sig.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright (c) 1982, 1986, 1989, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)kern_sig.c 8.7 (Berkeley) 4/18/94 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include "opt_compat.h" 41 #include "opt_ktrace.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/signalvar.h> 46 #include <sys/vnode.h> 47 #include <sys/acct.h> 48 #include <sys/condvar.h> 49 #include <sys/event.h> 50 #include <sys/fcntl.h> 51 #include <sys/kernel.h> 52 #include <sys/kse.h> 53 #include <sys/ktr.h> 54 #include <sys/ktrace.h> 55 #include <sys/lock.h> 56 #include <sys/malloc.h> 57 #include <sys/mutex.h> 58 #include <sys/namei.h> 59 #include <sys/proc.h> 60 #include <sys/posix4.h> 61 #include <sys/pioctl.h> 62 #include <sys/resourcevar.h> 63 #include <sys/sbuf.h> 64 #include <sys/sleepqueue.h> 65 #include <sys/smp.h> 66 #include <sys/stat.h> 67 #include <sys/sx.h> 68 #include <sys/syscallsubr.h> 69 #include <sys/sysctl.h> 70 #include <sys/sysent.h> 71 #include <sys/syslog.h> 72 #include <sys/sysproto.h> 73 #include <sys/timers.h> 74 #include <sys/unistd.h> 75 #include <sys/wait.h> 76 #include <vm/vm.h> 77 #include <vm/vm_extern.h> 78 #include <vm/uma.h> 79 80 #include <machine/cpu.h> 81 82 #include <security/audit/audit.h> 83 84 #define ONSIG 32 /* NSIG for osig* syscalls. XXX. */ 85 86 static int coredump(struct thread *); 87 static char *expand_name(const char *, uid_t, pid_t); 88 static int killpg1(struct thread *td, int sig, int pgid, int all); 89 static int issignal(struct thread *p); 90 static int sigprop(int sig); 91 static int tdsigwakeup(struct thread *, int, sig_t, int); 92 static void sig_suspend_threads(struct thread *, struct proc *, int); 93 static int filt_sigattach(struct knote *kn); 94 static void filt_sigdetach(struct knote *kn); 95 static int filt_signal(struct knote *kn, long hint); 96 static struct thread *sigtd(struct proc *p, int sig, int prop); 97 #ifdef KSE 98 static int do_tdsignal(struct proc *, struct thread *, int, ksiginfo_t *); 99 #endif 100 static void sigqueue_start(void); 101 102 static uma_zone_t ksiginfo_zone = NULL; 103 struct filterops sig_filtops = 104 { 0, filt_sigattach, filt_sigdetach, filt_signal }; 105 106 int kern_logsigexit = 1; 107 SYSCTL_INT(_kern, KERN_LOGSIGEXIT, logsigexit, CTLFLAG_RW, 108 &kern_logsigexit, 0, 109 "Log processes quitting on abnormal signals to syslog(3)"); 110 111 static int kern_forcesigexit = 1; 112 SYSCTL_INT(_kern, OID_AUTO, forcesigexit, CTLFLAG_RW, 113 &kern_forcesigexit, 0, "Force trap signal to be handled"); 114 115 SYSCTL_NODE(_kern, OID_AUTO, sigqueue, CTLFLAG_RW, 0, "POSIX real time signal"); 116 117 static int max_pending_per_proc = 128; 118 SYSCTL_INT(_kern_sigqueue, OID_AUTO, max_pending_per_proc, CTLFLAG_RW, 119 &max_pending_per_proc, 0, "Max pending signals per proc"); 120 121 static int preallocate_siginfo = 1024; 122 TUNABLE_INT("kern.sigqueue.preallocate", &preallocate_siginfo); 123 SYSCTL_INT(_kern_sigqueue, OID_AUTO, preallocate, CTLFLAG_RD, 124 &preallocate_siginfo, 0, "Preallocated signal memory size"); 125 126 static int signal_overflow = 0; 127 SYSCTL_INT(_kern_sigqueue, OID_AUTO, overflow, CTLFLAG_RD, 128 &signal_overflow, 0, "Number of signals overflew"); 129 130 static int signal_alloc_fail = 0; 131 SYSCTL_INT(_kern_sigqueue, OID_AUTO, alloc_fail, CTLFLAG_RD, 132 &signal_alloc_fail, 0, "signals failed to be allocated"); 133 134 SYSINIT(signal, SI_SUB_P1003_1B, SI_ORDER_FIRST+3, sigqueue_start, NULL); 135 136 /* 137 * Policy -- Can ucred cr1 send SIGIO to process cr2? 138 * Should use cr_cansignal() once cr_cansignal() allows SIGIO and SIGURG 139 * in the right situations. 140 */ 141 #define CANSIGIO(cr1, cr2) \ 142 ((cr1)->cr_uid == 0 || \ 143 (cr1)->cr_ruid == (cr2)->cr_ruid || \ 144 (cr1)->cr_uid == (cr2)->cr_ruid || \ 145 (cr1)->cr_ruid == (cr2)->cr_uid || \ 146 (cr1)->cr_uid == (cr2)->cr_uid) 147 148 int sugid_coredump; 149 SYSCTL_INT(_kern, OID_AUTO, sugid_coredump, CTLFLAG_RW, 150 &sugid_coredump, 0, "Enable coredumping set user/group ID processes"); 151 152 static int do_coredump = 1; 153 SYSCTL_INT(_kern, OID_AUTO, coredump, CTLFLAG_RW, 154 &do_coredump, 0, "Enable/Disable coredumps"); 155 156 static int set_core_nodump_flag = 0; 157 SYSCTL_INT(_kern, OID_AUTO, nodump_coredump, CTLFLAG_RW, &set_core_nodump_flag, 158 0, "Enable setting the NODUMP flag on coredump files"); 159 160 /* 161 * Signal properties and actions. 162 * The array below categorizes the signals and their default actions 163 * according to the following properties: 164 */ 165 #define SA_KILL 0x01 /* terminates process by default */ 166 #define SA_CORE 0x02 /* ditto and coredumps */ 167 #define SA_STOP 0x04 /* suspend process */ 168 #define SA_TTYSTOP 0x08 /* ditto, from tty */ 169 #define SA_IGNORE 0x10 /* ignore by default */ 170 #define SA_CONT 0x20 /* continue if suspended */ 171 #define SA_CANTMASK 0x40 /* non-maskable, catchable */ 172 #define SA_PROC 0x80 /* deliverable to any thread */ 173 174 static int sigproptbl[NSIG] = { 175 SA_KILL|SA_PROC, /* SIGHUP */ 176 SA_KILL|SA_PROC, /* SIGINT */ 177 SA_KILL|SA_CORE|SA_PROC, /* SIGQUIT */ 178 SA_KILL|SA_CORE, /* SIGILL */ 179 SA_KILL|SA_CORE, /* SIGTRAP */ 180 SA_KILL|SA_CORE, /* SIGABRT */ 181 SA_KILL|SA_CORE|SA_PROC, /* SIGEMT */ 182 SA_KILL|SA_CORE, /* SIGFPE */ 183 SA_KILL|SA_PROC, /* SIGKILL */ 184 SA_KILL|SA_CORE, /* SIGBUS */ 185 SA_KILL|SA_CORE, /* SIGSEGV */ 186 SA_KILL|SA_CORE, /* SIGSYS */ 187 SA_KILL|SA_PROC, /* SIGPIPE */ 188 SA_KILL|SA_PROC, /* SIGALRM */ 189 SA_KILL|SA_PROC, /* SIGTERM */ 190 SA_IGNORE|SA_PROC, /* SIGURG */ 191 SA_STOP|SA_PROC, /* SIGSTOP */ 192 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTSTP */ 193 SA_IGNORE|SA_CONT|SA_PROC, /* SIGCONT */ 194 SA_IGNORE|SA_PROC, /* SIGCHLD */ 195 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTTIN */ 196 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTTOU */ 197 SA_IGNORE|SA_PROC, /* SIGIO */ 198 SA_KILL, /* SIGXCPU */ 199 SA_KILL, /* SIGXFSZ */ 200 SA_KILL|SA_PROC, /* SIGVTALRM */ 201 SA_KILL|SA_PROC, /* SIGPROF */ 202 SA_IGNORE|SA_PROC, /* SIGWINCH */ 203 SA_IGNORE|SA_PROC, /* SIGINFO */ 204 SA_KILL|SA_PROC, /* SIGUSR1 */ 205 SA_KILL|SA_PROC, /* SIGUSR2 */ 206 }; 207 208 static void 209 sigqueue_start(void) 210 { 211 ksiginfo_zone = uma_zcreate("ksiginfo", sizeof(ksiginfo_t), 212 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 213 uma_prealloc(ksiginfo_zone, preallocate_siginfo); 214 p31b_setcfg(CTL_P1003_1B_REALTIME_SIGNALS, _POSIX_REALTIME_SIGNALS); 215 p31b_setcfg(CTL_P1003_1B_RTSIG_MAX, SIGRTMAX - SIGRTMIN + 1); 216 p31b_setcfg(CTL_P1003_1B_SIGQUEUE_MAX, max_pending_per_proc); 217 } 218 219 ksiginfo_t * 220 ksiginfo_alloc(int wait) 221 { 222 int flags; 223 224 flags = M_ZERO; 225 if (! wait) 226 flags |= M_NOWAIT; 227 if (ksiginfo_zone != NULL) 228 return ((ksiginfo_t *)uma_zalloc(ksiginfo_zone, flags)); 229 return (NULL); 230 } 231 232 void 233 ksiginfo_free(ksiginfo_t *ksi) 234 { 235 uma_zfree(ksiginfo_zone, ksi); 236 } 237 238 static __inline int 239 ksiginfo_tryfree(ksiginfo_t *ksi) 240 { 241 if (!(ksi->ksi_flags & KSI_EXT)) { 242 uma_zfree(ksiginfo_zone, ksi); 243 return (1); 244 } 245 return (0); 246 } 247 248 void 249 sigqueue_init(sigqueue_t *list, struct proc *p) 250 { 251 SIGEMPTYSET(list->sq_signals); 252 SIGEMPTYSET(list->sq_kill); 253 TAILQ_INIT(&list->sq_list); 254 list->sq_proc = p; 255 list->sq_flags = SQ_INIT; 256 } 257 258 /* 259 * Get a signal's ksiginfo. 260 * Return: 261 * 0 - signal not found 262 * others - signal number 263 */ 264 int 265 sigqueue_get(sigqueue_t *sq, int signo, ksiginfo_t *si) 266 { 267 struct proc *p = sq->sq_proc; 268 struct ksiginfo *ksi, *next; 269 int count = 0; 270 271 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited")); 272 273 if (!SIGISMEMBER(sq->sq_signals, signo)) 274 return (0); 275 276 if (SIGISMEMBER(sq->sq_kill, signo)) { 277 count++; 278 SIGDELSET(sq->sq_kill, signo); 279 } 280 281 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) { 282 if (ksi->ksi_signo == signo) { 283 if (count == 0) { 284 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link); 285 ksi->ksi_sigq = NULL; 286 ksiginfo_copy(ksi, si); 287 if (ksiginfo_tryfree(ksi) && p != NULL) 288 p->p_pendingcnt--; 289 } 290 if (++count > 1) 291 break; 292 } 293 } 294 295 if (count <= 1) 296 SIGDELSET(sq->sq_signals, signo); 297 si->ksi_signo = signo; 298 return (signo); 299 } 300 301 void 302 sigqueue_take(ksiginfo_t *ksi) 303 { 304 struct ksiginfo *kp; 305 struct proc *p; 306 sigqueue_t *sq; 307 308 if (ksi == NULL || (sq = ksi->ksi_sigq) == NULL) 309 return; 310 311 p = sq->sq_proc; 312 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link); 313 ksi->ksi_sigq = NULL; 314 if (!(ksi->ksi_flags & KSI_EXT) && p != NULL) 315 p->p_pendingcnt--; 316 317 for (kp = TAILQ_FIRST(&sq->sq_list); kp != NULL; 318 kp = TAILQ_NEXT(kp, ksi_link)) { 319 if (kp->ksi_signo == ksi->ksi_signo) 320 break; 321 } 322 if (kp == NULL && !SIGISMEMBER(sq->sq_kill, ksi->ksi_signo)) 323 SIGDELSET(sq->sq_signals, ksi->ksi_signo); 324 } 325 326 int 327 sigqueue_add(sigqueue_t *sq, int signo, ksiginfo_t *si) 328 { 329 struct proc *p = sq->sq_proc; 330 struct ksiginfo *ksi; 331 int ret = 0; 332 333 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited")); 334 335 if (signo == SIGKILL || signo == SIGSTOP || si == NULL) { 336 SIGADDSET(sq->sq_kill, signo); 337 goto out_set_bit; 338 } 339 340 /* directly insert the ksi, don't copy it */ 341 if (si->ksi_flags & KSI_INS) { 342 TAILQ_INSERT_TAIL(&sq->sq_list, si, ksi_link); 343 si->ksi_sigq = sq; 344 goto out_set_bit; 345 } 346 347 if (__predict_false(ksiginfo_zone == NULL)) { 348 SIGADDSET(sq->sq_kill, signo); 349 goto out_set_bit; 350 } 351 352 if (p != NULL && p->p_pendingcnt >= max_pending_per_proc) { 353 signal_overflow++; 354 ret = EAGAIN; 355 } else if ((ksi = ksiginfo_alloc(0)) == NULL) { 356 signal_alloc_fail++; 357 ret = EAGAIN; 358 } else { 359 if (p != NULL) 360 p->p_pendingcnt++; 361 ksiginfo_copy(si, ksi); 362 ksi->ksi_signo = signo; 363 TAILQ_INSERT_TAIL(&sq->sq_list, ksi, ksi_link); 364 ksi->ksi_sigq = sq; 365 } 366 367 if ((si->ksi_flags & KSI_TRAP) != 0) { 368 if (ret != 0) 369 SIGADDSET(sq->sq_kill, signo); 370 ret = 0; 371 goto out_set_bit; 372 } 373 374 if (ret != 0) 375 return (ret); 376 377 out_set_bit: 378 SIGADDSET(sq->sq_signals, signo); 379 return (ret); 380 } 381 382 void 383 sigqueue_flush(sigqueue_t *sq) 384 { 385 struct proc *p = sq->sq_proc; 386 ksiginfo_t *ksi; 387 388 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited")); 389 390 if (p != NULL) 391 PROC_LOCK_ASSERT(p, MA_OWNED); 392 393 while ((ksi = TAILQ_FIRST(&sq->sq_list)) != NULL) { 394 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link); 395 ksi->ksi_sigq = NULL; 396 if (ksiginfo_tryfree(ksi) && p != NULL) 397 p->p_pendingcnt--; 398 } 399 400 SIGEMPTYSET(sq->sq_signals); 401 SIGEMPTYSET(sq->sq_kill); 402 } 403 404 void 405 sigqueue_collect_set(sigqueue_t *sq, sigset_t *set) 406 { 407 ksiginfo_t *ksi; 408 409 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited")); 410 411 TAILQ_FOREACH(ksi, &sq->sq_list, ksi_link) 412 SIGADDSET(*set, ksi->ksi_signo); 413 SIGSETOR(*set, sq->sq_kill); 414 } 415 416 void 417 sigqueue_move_set(sigqueue_t *src, sigqueue_t *dst, sigset_t *setp) 418 { 419 sigset_t tmp, set; 420 struct proc *p1, *p2; 421 ksiginfo_t *ksi, *next; 422 423 KASSERT(src->sq_flags & SQ_INIT, ("src sigqueue not inited")); 424 KASSERT(dst->sq_flags & SQ_INIT, ("dst sigqueue not inited")); 425 /* 426 * make a copy, this allows setp to point to src or dst 427 * sq_signals without trouble. 428 */ 429 set = *setp; 430 p1 = src->sq_proc; 431 p2 = dst->sq_proc; 432 /* Move siginfo to target list */ 433 TAILQ_FOREACH_SAFE(ksi, &src->sq_list, ksi_link, next) { 434 if (SIGISMEMBER(set, ksi->ksi_signo)) { 435 TAILQ_REMOVE(&src->sq_list, ksi, ksi_link); 436 if (p1 != NULL) 437 p1->p_pendingcnt--; 438 TAILQ_INSERT_TAIL(&dst->sq_list, ksi, ksi_link); 439 ksi->ksi_sigq = dst; 440 if (p2 != NULL) 441 p2->p_pendingcnt++; 442 } 443 } 444 445 /* Move pending bits to target list */ 446 tmp = src->sq_kill; 447 SIGSETAND(tmp, set); 448 SIGSETOR(dst->sq_kill, tmp); 449 SIGSETNAND(src->sq_kill, tmp); 450 451 tmp = src->sq_signals; 452 SIGSETAND(tmp, set); 453 SIGSETOR(dst->sq_signals, tmp); 454 SIGSETNAND(src->sq_signals, tmp); 455 456 /* Finally, rescan src queue and set pending bits for it */ 457 sigqueue_collect_set(src, &src->sq_signals); 458 } 459 460 void 461 sigqueue_move(sigqueue_t *src, sigqueue_t *dst, int signo) 462 { 463 sigset_t set; 464 465 SIGEMPTYSET(set); 466 SIGADDSET(set, signo); 467 sigqueue_move_set(src, dst, &set); 468 } 469 470 void 471 sigqueue_delete_set(sigqueue_t *sq, sigset_t *set) 472 { 473 struct proc *p = sq->sq_proc; 474 ksiginfo_t *ksi, *next; 475 476 KASSERT(sq->sq_flags & SQ_INIT, ("src sigqueue not inited")); 477 478 /* Remove siginfo queue */ 479 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) { 480 if (SIGISMEMBER(*set, ksi->ksi_signo)) { 481 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link); 482 ksi->ksi_sigq = NULL; 483 if (ksiginfo_tryfree(ksi) && p != NULL) 484 p->p_pendingcnt--; 485 } 486 } 487 SIGSETNAND(sq->sq_kill, *set); 488 SIGSETNAND(sq->sq_signals, *set); 489 /* Finally, rescan queue and set pending bits for it */ 490 sigqueue_collect_set(sq, &sq->sq_signals); 491 } 492 493 void 494 sigqueue_delete(sigqueue_t *sq, int signo) 495 { 496 sigset_t set; 497 498 SIGEMPTYSET(set); 499 SIGADDSET(set, signo); 500 sigqueue_delete_set(sq, &set); 501 } 502 503 /* Remove a set of signals for a process */ 504 void 505 sigqueue_delete_set_proc(struct proc *p, sigset_t *set) 506 { 507 sigqueue_t worklist; 508 struct thread *td0; 509 510 PROC_LOCK_ASSERT(p, MA_OWNED); 511 512 sigqueue_init(&worklist, NULL); 513 sigqueue_move_set(&p->p_sigqueue, &worklist, set); 514 515 PROC_SLOCK(p); 516 FOREACH_THREAD_IN_PROC(p, td0) 517 sigqueue_move_set(&td0->td_sigqueue, &worklist, set); 518 PROC_SUNLOCK(p); 519 520 sigqueue_flush(&worklist); 521 } 522 523 void 524 sigqueue_delete_proc(struct proc *p, int signo) 525 { 526 sigset_t set; 527 528 SIGEMPTYSET(set); 529 SIGADDSET(set, signo); 530 sigqueue_delete_set_proc(p, &set); 531 } 532 533 void 534 sigqueue_delete_stopmask_proc(struct proc *p) 535 { 536 sigset_t set; 537 538 SIGEMPTYSET(set); 539 SIGADDSET(set, SIGSTOP); 540 SIGADDSET(set, SIGTSTP); 541 SIGADDSET(set, SIGTTIN); 542 SIGADDSET(set, SIGTTOU); 543 sigqueue_delete_set_proc(p, &set); 544 } 545 546 /* 547 * Determine signal that should be delivered to process p, the current 548 * process, 0 if none. If there is a pending stop signal with default 549 * action, the process stops in issignal(). 550 */ 551 int 552 cursig(struct thread *td) 553 { 554 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 555 mtx_assert(&td->td_proc->p_sigacts->ps_mtx, MA_OWNED); 556 THREAD_LOCK_ASSERT(td, MA_NOTOWNED); 557 return (SIGPENDING(td) ? issignal(td) : 0); 558 } 559 560 /* 561 * Arrange for ast() to handle unmasked pending signals on return to user 562 * mode. This must be called whenever a signal is added to td_sigqueue or 563 * unmasked in td_sigmask. 564 */ 565 void 566 signotify(struct thread *td) 567 { 568 struct proc *p; 569 #ifdef KSE 570 sigset_t set, saved; 571 #else 572 sigset_t set; 573 #endif 574 575 p = td->td_proc; 576 577 PROC_LOCK_ASSERT(p, MA_OWNED); 578 579 /* 580 * If our mask changed we may have to move signal that were 581 * previously masked by all threads to our sigqueue. 582 */ 583 set = p->p_sigqueue.sq_signals; 584 #ifdef KSE 585 if (p->p_flag & P_SA) 586 saved = p->p_sigqueue.sq_signals; 587 #endif 588 SIGSETNAND(set, td->td_sigmask); 589 if (! SIGISEMPTY(set)) 590 sigqueue_move_set(&p->p_sigqueue, &td->td_sigqueue, &set); 591 if (SIGPENDING(td)) { 592 thread_lock(td); 593 td->td_flags |= TDF_NEEDSIGCHK | TDF_ASTPENDING; 594 thread_unlock(td); 595 } 596 #ifdef KSE 597 if ((p->p_flag & P_SA) && !(p->p_flag & P_SIGEVENT)) { 598 if (!SIGSETEQ(saved, p->p_sigqueue.sq_signals)) { 599 /* pending set changed */ 600 p->p_flag |= P_SIGEVENT; 601 wakeup(&p->p_siglist); 602 } 603 } 604 #endif 605 } 606 607 int 608 sigonstack(size_t sp) 609 { 610 struct thread *td = curthread; 611 612 return ((td->td_pflags & TDP_ALTSTACK) ? 613 #if defined(COMPAT_43) 614 ((td->td_sigstk.ss_size == 0) ? 615 (td->td_sigstk.ss_flags & SS_ONSTACK) : 616 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size)) 617 #else 618 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size) 619 #endif 620 : 0); 621 } 622 623 static __inline int 624 sigprop(int sig) 625 { 626 627 if (sig > 0 && sig < NSIG) 628 return (sigproptbl[_SIG_IDX(sig)]); 629 return (0); 630 } 631 632 int 633 sig_ffs(sigset_t *set) 634 { 635 int i; 636 637 for (i = 0; i < _SIG_WORDS; i++) 638 if (set->__bits[i]) 639 return (ffs(set->__bits[i]) + (i * 32)); 640 return (0); 641 } 642 643 /* 644 * kern_sigaction 645 * sigaction 646 * freebsd4_sigaction 647 * osigaction 648 */ 649 int 650 kern_sigaction(td, sig, act, oact, flags) 651 struct thread *td; 652 register int sig; 653 struct sigaction *act, *oact; 654 int flags; 655 { 656 struct sigacts *ps; 657 struct proc *p = td->td_proc; 658 659 if (!_SIG_VALID(sig)) 660 return (EINVAL); 661 662 PROC_LOCK(p); 663 ps = p->p_sigacts; 664 mtx_lock(&ps->ps_mtx); 665 if (oact) { 666 oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)]; 667 oact->sa_flags = 0; 668 if (SIGISMEMBER(ps->ps_sigonstack, sig)) 669 oact->sa_flags |= SA_ONSTACK; 670 if (!SIGISMEMBER(ps->ps_sigintr, sig)) 671 oact->sa_flags |= SA_RESTART; 672 if (SIGISMEMBER(ps->ps_sigreset, sig)) 673 oact->sa_flags |= SA_RESETHAND; 674 if (SIGISMEMBER(ps->ps_signodefer, sig)) 675 oact->sa_flags |= SA_NODEFER; 676 if (SIGISMEMBER(ps->ps_siginfo, sig)) { 677 oact->sa_flags |= SA_SIGINFO; 678 oact->sa_sigaction = 679 (__siginfohandler_t *)ps->ps_sigact[_SIG_IDX(sig)]; 680 } else 681 oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)]; 682 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDSTOP) 683 oact->sa_flags |= SA_NOCLDSTOP; 684 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDWAIT) 685 oact->sa_flags |= SA_NOCLDWAIT; 686 } 687 if (act) { 688 if ((sig == SIGKILL || sig == SIGSTOP) && 689 act->sa_handler != SIG_DFL) { 690 mtx_unlock(&ps->ps_mtx); 691 PROC_UNLOCK(p); 692 return (EINVAL); 693 } 694 695 /* 696 * Change setting atomically. 697 */ 698 699 ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask; 700 SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]); 701 if (act->sa_flags & SA_SIGINFO) { 702 ps->ps_sigact[_SIG_IDX(sig)] = 703 (__sighandler_t *)act->sa_sigaction; 704 SIGADDSET(ps->ps_siginfo, sig); 705 } else { 706 ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler; 707 SIGDELSET(ps->ps_siginfo, sig); 708 } 709 if (!(act->sa_flags & SA_RESTART)) 710 SIGADDSET(ps->ps_sigintr, sig); 711 else 712 SIGDELSET(ps->ps_sigintr, sig); 713 if (act->sa_flags & SA_ONSTACK) 714 SIGADDSET(ps->ps_sigonstack, sig); 715 else 716 SIGDELSET(ps->ps_sigonstack, sig); 717 if (act->sa_flags & SA_RESETHAND) 718 SIGADDSET(ps->ps_sigreset, sig); 719 else 720 SIGDELSET(ps->ps_sigreset, sig); 721 if (act->sa_flags & SA_NODEFER) 722 SIGADDSET(ps->ps_signodefer, sig); 723 else 724 SIGDELSET(ps->ps_signodefer, sig); 725 if (sig == SIGCHLD) { 726 if (act->sa_flags & SA_NOCLDSTOP) 727 ps->ps_flag |= PS_NOCLDSTOP; 728 else 729 ps->ps_flag &= ~PS_NOCLDSTOP; 730 if (act->sa_flags & SA_NOCLDWAIT) { 731 /* 732 * Paranoia: since SA_NOCLDWAIT is implemented 733 * by reparenting the dying child to PID 1 (and 734 * trust it to reap the zombie), PID 1 itself 735 * is forbidden to set SA_NOCLDWAIT. 736 */ 737 if (p->p_pid == 1) 738 ps->ps_flag &= ~PS_NOCLDWAIT; 739 else 740 ps->ps_flag |= PS_NOCLDWAIT; 741 } else 742 ps->ps_flag &= ~PS_NOCLDWAIT; 743 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN) 744 ps->ps_flag |= PS_CLDSIGIGN; 745 else 746 ps->ps_flag &= ~PS_CLDSIGIGN; 747 } 748 /* 749 * Set bit in ps_sigignore for signals that are set to SIG_IGN, 750 * and for signals set to SIG_DFL where the default is to 751 * ignore. However, don't put SIGCONT in ps_sigignore, as we 752 * have to restart the process. 753 */ 754 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN || 755 (sigprop(sig) & SA_IGNORE && 756 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) { 757 #ifdef KSE 758 if ((p->p_flag & P_SA) && 759 SIGISMEMBER(p->p_sigqueue.sq_signals, sig)) { 760 p->p_flag |= P_SIGEVENT; 761 wakeup(&p->p_siglist); 762 } 763 #endif 764 /* never to be seen again */ 765 sigqueue_delete_proc(p, sig); 766 if (sig != SIGCONT) 767 /* easier in psignal */ 768 SIGADDSET(ps->ps_sigignore, sig); 769 SIGDELSET(ps->ps_sigcatch, sig); 770 } else { 771 SIGDELSET(ps->ps_sigignore, sig); 772 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL) 773 SIGDELSET(ps->ps_sigcatch, sig); 774 else 775 SIGADDSET(ps->ps_sigcatch, sig); 776 } 777 #ifdef COMPAT_FREEBSD4 778 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN || 779 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL || 780 (flags & KSA_FREEBSD4) == 0) 781 SIGDELSET(ps->ps_freebsd4, sig); 782 else 783 SIGADDSET(ps->ps_freebsd4, sig); 784 #endif 785 #ifdef COMPAT_43 786 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN || 787 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL || 788 (flags & KSA_OSIGSET) == 0) 789 SIGDELSET(ps->ps_osigset, sig); 790 else 791 SIGADDSET(ps->ps_osigset, sig); 792 #endif 793 } 794 mtx_unlock(&ps->ps_mtx); 795 PROC_UNLOCK(p); 796 return (0); 797 } 798 799 #ifndef _SYS_SYSPROTO_H_ 800 struct sigaction_args { 801 int sig; 802 struct sigaction *act; 803 struct sigaction *oact; 804 }; 805 #endif 806 int 807 sigaction(td, uap) 808 struct thread *td; 809 register struct sigaction_args *uap; 810 { 811 struct sigaction act, oact; 812 register struct sigaction *actp, *oactp; 813 int error; 814 815 actp = (uap->act != NULL) ? &act : NULL; 816 oactp = (uap->oact != NULL) ? &oact : NULL; 817 if (actp) { 818 error = copyin(uap->act, actp, sizeof(act)); 819 if (error) 820 return (error); 821 } 822 error = kern_sigaction(td, uap->sig, actp, oactp, 0); 823 if (oactp && !error) 824 error = copyout(oactp, uap->oact, sizeof(oact)); 825 return (error); 826 } 827 828 #ifdef COMPAT_FREEBSD4 829 #ifndef _SYS_SYSPROTO_H_ 830 struct freebsd4_sigaction_args { 831 int sig; 832 struct sigaction *act; 833 struct sigaction *oact; 834 }; 835 #endif 836 int 837 freebsd4_sigaction(td, uap) 838 struct thread *td; 839 register struct freebsd4_sigaction_args *uap; 840 { 841 struct sigaction act, oact; 842 register struct sigaction *actp, *oactp; 843 int error; 844 845 846 actp = (uap->act != NULL) ? &act : NULL; 847 oactp = (uap->oact != NULL) ? &oact : NULL; 848 if (actp) { 849 error = copyin(uap->act, actp, sizeof(act)); 850 if (error) 851 return (error); 852 } 853 error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4); 854 if (oactp && !error) 855 error = copyout(oactp, uap->oact, sizeof(oact)); 856 return (error); 857 } 858 #endif /* COMAPT_FREEBSD4 */ 859 860 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */ 861 #ifndef _SYS_SYSPROTO_H_ 862 struct osigaction_args { 863 int signum; 864 struct osigaction *nsa; 865 struct osigaction *osa; 866 }; 867 #endif 868 int 869 osigaction(td, uap) 870 struct thread *td; 871 register struct osigaction_args *uap; 872 { 873 struct osigaction sa; 874 struct sigaction nsa, osa; 875 register struct sigaction *nsap, *osap; 876 int error; 877 878 if (uap->signum <= 0 || uap->signum >= ONSIG) 879 return (EINVAL); 880 881 nsap = (uap->nsa != NULL) ? &nsa : NULL; 882 osap = (uap->osa != NULL) ? &osa : NULL; 883 884 if (nsap) { 885 error = copyin(uap->nsa, &sa, sizeof(sa)); 886 if (error) 887 return (error); 888 nsap->sa_handler = sa.sa_handler; 889 nsap->sa_flags = sa.sa_flags; 890 OSIG2SIG(sa.sa_mask, nsap->sa_mask); 891 } 892 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET); 893 if (osap && !error) { 894 sa.sa_handler = osap->sa_handler; 895 sa.sa_flags = osap->sa_flags; 896 SIG2OSIG(osap->sa_mask, sa.sa_mask); 897 error = copyout(&sa, uap->osa, sizeof(sa)); 898 } 899 return (error); 900 } 901 902 #if !defined(__i386__) 903 /* Avoid replicating the same stub everywhere */ 904 int 905 osigreturn(td, uap) 906 struct thread *td; 907 struct osigreturn_args *uap; 908 { 909 910 return (nosys(td, (struct nosys_args *)uap)); 911 } 912 #endif 913 #endif /* COMPAT_43 */ 914 915 /* 916 * Initialize signal state for process 0; 917 * set to ignore signals that are ignored by default. 918 */ 919 void 920 siginit(p) 921 struct proc *p; 922 { 923 register int i; 924 struct sigacts *ps; 925 926 PROC_LOCK(p); 927 ps = p->p_sigacts; 928 mtx_lock(&ps->ps_mtx); 929 for (i = 1; i <= NSIG; i++) 930 if (sigprop(i) & SA_IGNORE && i != SIGCONT) 931 SIGADDSET(ps->ps_sigignore, i); 932 mtx_unlock(&ps->ps_mtx); 933 PROC_UNLOCK(p); 934 } 935 936 /* 937 * Reset signals for an exec of the specified process. 938 */ 939 void 940 execsigs(struct proc *p) 941 { 942 struct sigacts *ps; 943 int sig; 944 struct thread *td; 945 946 /* 947 * Reset caught signals. Held signals remain held 948 * through td_sigmask (unless they were caught, 949 * and are now ignored by default). 950 */ 951 PROC_LOCK_ASSERT(p, MA_OWNED); 952 td = FIRST_THREAD_IN_PROC(p); 953 ps = p->p_sigacts; 954 mtx_lock(&ps->ps_mtx); 955 while (SIGNOTEMPTY(ps->ps_sigcatch)) { 956 sig = sig_ffs(&ps->ps_sigcatch); 957 SIGDELSET(ps->ps_sigcatch, sig); 958 if (sigprop(sig) & SA_IGNORE) { 959 if (sig != SIGCONT) 960 SIGADDSET(ps->ps_sigignore, sig); 961 sigqueue_delete_proc(p, sig); 962 } 963 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL; 964 } 965 /* 966 * Reset stack state to the user stack. 967 * Clear set of signals caught on the signal stack. 968 */ 969 td->td_sigstk.ss_flags = SS_DISABLE; 970 td->td_sigstk.ss_size = 0; 971 td->td_sigstk.ss_sp = 0; 972 td->td_pflags &= ~TDP_ALTSTACK; 973 /* 974 * Reset no zombies if child dies flag as Solaris does. 975 */ 976 ps->ps_flag &= ~(PS_NOCLDWAIT | PS_CLDSIGIGN); 977 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN) 978 ps->ps_sigact[_SIG_IDX(SIGCHLD)] = SIG_DFL; 979 mtx_unlock(&ps->ps_mtx); 980 } 981 982 /* 983 * kern_sigprocmask() 984 * 985 * Manipulate signal mask. 986 */ 987 int 988 kern_sigprocmask(td, how, set, oset, old) 989 struct thread *td; 990 int how; 991 sigset_t *set, *oset; 992 int old; 993 { 994 int error; 995 996 PROC_LOCK(td->td_proc); 997 if (oset != NULL) 998 *oset = td->td_sigmask; 999 1000 error = 0; 1001 if (set != NULL) { 1002 switch (how) { 1003 case SIG_BLOCK: 1004 SIG_CANTMASK(*set); 1005 SIGSETOR(td->td_sigmask, *set); 1006 break; 1007 case SIG_UNBLOCK: 1008 SIGSETNAND(td->td_sigmask, *set); 1009 signotify(td); 1010 break; 1011 case SIG_SETMASK: 1012 SIG_CANTMASK(*set); 1013 if (old) 1014 SIGSETLO(td->td_sigmask, *set); 1015 else 1016 td->td_sigmask = *set; 1017 signotify(td); 1018 break; 1019 default: 1020 error = EINVAL; 1021 break; 1022 } 1023 } 1024 PROC_UNLOCK(td->td_proc); 1025 return (error); 1026 } 1027 1028 #ifndef _SYS_SYSPROTO_H_ 1029 struct sigprocmask_args { 1030 int how; 1031 const sigset_t *set; 1032 sigset_t *oset; 1033 }; 1034 #endif 1035 int 1036 sigprocmask(td, uap) 1037 register struct thread *td; 1038 struct sigprocmask_args *uap; 1039 { 1040 sigset_t set, oset; 1041 sigset_t *setp, *osetp; 1042 int error; 1043 1044 setp = (uap->set != NULL) ? &set : NULL; 1045 osetp = (uap->oset != NULL) ? &oset : NULL; 1046 if (setp) { 1047 error = copyin(uap->set, setp, sizeof(set)); 1048 if (error) 1049 return (error); 1050 } 1051 error = kern_sigprocmask(td, uap->how, setp, osetp, 0); 1052 if (osetp && !error) { 1053 error = copyout(osetp, uap->oset, sizeof(oset)); 1054 } 1055 return (error); 1056 } 1057 1058 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */ 1059 #ifndef _SYS_SYSPROTO_H_ 1060 struct osigprocmask_args { 1061 int how; 1062 osigset_t mask; 1063 }; 1064 #endif 1065 int 1066 osigprocmask(td, uap) 1067 register struct thread *td; 1068 struct osigprocmask_args *uap; 1069 { 1070 sigset_t set, oset; 1071 int error; 1072 1073 OSIG2SIG(uap->mask, set); 1074 error = kern_sigprocmask(td, uap->how, &set, &oset, 1); 1075 SIG2OSIG(oset, td->td_retval[0]); 1076 return (error); 1077 } 1078 #endif /* COMPAT_43 */ 1079 1080 int 1081 sigwait(struct thread *td, struct sigwait_args *uap) 1082 { 1083 ksiginfo_t ksi; 1084 sigset_t set; 1085 int error; 1086 1087 error = copyin(uap->set, &set, sizeof(set)); 1088 if (error) { 1089 td->td_retval[0] = error; 1090 return (0); 1091 } 1092 1093 error = kern_sigtimedwait(td, set, &ksi, NULL); 1094 if (error) { 1095 if (error == ERESTART) 1096 return (error); 1097 td->td_retval[0] = error; 1098 return (0); 1099 } 1100 1101 error = copyout(&ksi.ksi_signo, uap->sig, sizeof(ksi.ksi_signo)); 1102 td->td_retval[0] = error; 1103 return (0); 1104 } 1105 1106 int 1107 sigtimedwait(struct thread *td, struct sigtimedwait_args *uap) 1108 { 1109 struct timespec ts; 1110 struct timespec *timeout; 1111 sigset_t set; 1112 ksiginfo_t ksi; 1113 int error; 1114 1115 if (uap->timeout) { 1116 error = copyin(uap->timeout, &ts, sizeof(ts)); 1117 if (error) 1118 return (error); 1119 1120 timeout = &ts; 1121 } else 1122 timeout = NULL; 1123 1124 error = copyin(uap->set, &set, sizeof(set)); 1125 if (error) 1126 return (error); 1127 1128 error = kern_sigtimedwait(td, set, &ksi, timeout); 1129 if (error) 1130 return (error); 1131 1132 if (uap->info) 1133 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t)); 1134 1135 if (error == 0) 1136 td->td_retval[0] = ksi.ksi_signo; 1137 return (error); 1138 } 1139 1140 int 1141 sigwaitinfo(struct thread *td, struct sigwaitinfo_args *uap) 1142 { 1143 ksiginfo_t ksi; 1144 sigset_t set; 1145 int error; 1146 1147 error = copyin(uap->set, &set, sizeof(set)); 1148 if (error) 1149 return (error); 1150 1151 error = kern_sigtimedwait(td, set, &ksi, NULL); 1152 if (error) 1153 return (error); 1154 1155 if (uap->info) 1156 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t)); 1157 1158 if (error == 0) 1159 td->td_retval[0] = ksi.ksi_signo; 1160 return (error); 1161 } 1162 1163 int 1164 kern_sigtimedwait(struct thread *td, sigset_t waitset, ksiginfo_t *ksi, 1165 struct timespec *timeout) 1166 { 1167 struct sigacts *ps; 1168 sigset_t savedmask; 1169 struct proc *p; 1170 int error, sig, hz, i, timevalid = 0; 1171 struct timespec rts, ets, ts; 1172 struct timeval tv; 1173 1174 p = td->td_proc; 1175 error = 0; 1176 sig = 0; 1177 ets.tv_sec = 0; 1178 ets.tv_nsec = 0; 1179 SIG_CANTMASK(waitset); 1180 1181 PROC_LOCK(p); 1182 ps = p->p_sigacts; 1183 savedmask = td->td_sigmask; 1184 if (timeout) { 1185 if (timeout->tv_nsec >= 0 && timeout->tv_nsec < 1000000000) { 1186 timevalid = 1; 1187 getnanouptime(&rts); 1188 ets = rts; 1189 timespecadd(&ets, timeout); 1190 } 1191 } 1192 1193 restart: 1194 for (i = 1; i <= _SIG_MAXSIG; ++i) { 1195 if (!SIGISMEMBER(waitset, i)) 1196 continue; 1197 if (!SIGISMEMBER(td->td_sigqueue.sq_signals, i)) { 1198 if (SIGISMEMBER(p->p_sigqueue.sq_signals, i)) { 1199 #ifdef KSE 1200 if (p->p_flag & P_SA) { 1201 p->p_flag |= P_SIGEVENT; 1202 wakeup(&p->p_siglist); 1203 } 1204 #endif 1205 sigqueue_move(&p->p_sigqueue, 1206 &td->td_sigqueue, i); 1207 } else 1208 continue; 1209 } 1210 1211 SIGFILLSET(td->td_sigmask); 1212 SIG_CANTMASK(td->td_sigmask); 1213 SIGDELSET(td->td_sigmask, i); 1214 mtx_lock(&ps->ps_mtx); 1215 sig = cursig(td); 1216 mtx_unlock(&ps->ps_mtx); 1217 if (sig) 1218 goto out; 1219 else { 1220 /* 1221 * Because cursig() may have stopped current thread, 1222 * after it is resumed, things may have already been 1223 * changed, it should rescan any pending signals. 1224 */ 1225 goto restart; 1226 } 1227 } 1228 1229 if (error) 1230 goto out; 1231 1232 /* 1233 * POSIX says this must be checked after looking for pending 1234 * signals. 1235 */ 1236 if (timeout) { 1237 if (!timevalid) { 1238 error = EINVAL; 1239 goto out; 1240 } 1241 getnanouptime(&rts); 1242 if (timespeccmp(&rts, &ets, >=)) { 1243 error = EAGAIN; 1244 goto out; 1245 } 1246 ts = ets; 1247 timespecsub(&ts, &rts); 1248 TIMESPEC_TO_TIMEVAL(&tv, &ts); 1249 hz = tvtohz(&tv); 1250 } else 1251 hz = 0; 1252 1253 td->td_sigmask = savedmask; 1254 SIGSETNAND(td->td_sigmask, waitset); 1255 signotify(td); 1256 error = msleep(&ps, &p->p_mtx, PPAUSE|PCATCH, "sigwait", hz); 1257 if (timeout) { 1258 if (error == ERESTART) { 1259 /* timeout can not be restarted. */ 1260 error = EINTR; 1261 } else if (error == EAGAIN) { 1262 /* will calculate timeout by ourself. */ 1263 error = 0; 1264 } 1265 } 1266 goto restart; 1267 1268 out: 1269 td->td_sigmask = savedmask; 1270 signotify(td); 1271 if (sig) { 1272 ksiginfo_init(ksi); 1273 sigqueue_get(&td->td_sigqueue, sig, ksi); 1274 ksi->ksi_signo = sig; 1275 if (ksi->ksi_code == SI_TIMER) 1276 itimer_accept(p, ksi->ksi_timerid, ksi); 1277 error = 0; 1278 1279 #ifdef KTRACE 1280 if (KTRPOINT(td, KTR_PSIG)) { 1281 sig_t action; 1282 1283 mtx_lock(&ps->ps_mtx); 1284 action = ps->ps_sigact[_SIG_IDX(sig)]; 1285 mtx_unlock(&ps->ps_mtx); 1286 ktrpsig(sig, action, &td->td_sigmask, 0); 1287 } 1288 #endif 1289 if (sig == SIGKILL) 1290 sigexit(td, sig); 1291 } 1292 PROC_UNLOCK(p); 1293 return (error); 1294 } 1295 1296 #ifndef _SYS_SYSPROTO_H_ 1297 struct sigpending_args { 1298 sigset_t *set; 1299 }; 1300 #endif 1301 int 1302 sigpending(td, uap) 1303 struct thread *td; 1304 struct sigpending_args *uap; 1305 { 1306 struct proc *p = td->td_proc; 1307 sigset_t pending; 1308 1309 PROC_LOCK(p); 1310 pending = p->p_sigqueue.sq_signals; 1311 SIGSETOR(pending, td->td_sigqueue.sq_signals); 1312 PROC_UNLOCK(p); 1313 return (copyout(&pending, uap->set, sizeof(sigset_t))); 1314 } 1315 1316 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */ 1317 #ifndef _SYS_SYSPROTO_H_ 1318 struct osigpending_args { 1319 int dummy; 1320 }; 1321 #endif 1322 int 1323 osigpending(td, uap) 1324 struct thread *td; 1325 struct osigpending_args *uap; 1326 { 1327 struct proc *p = td->td_proc; 1328 sigset_t pending; 1329 1330 PROC_LOCK(p); 1331 pending = p->p_sigqueue.sq_signals; 1332 SIGSETOR(pending, td->td_sigqueue.sq_signals); 1333 PROC_UNLOCK(p); 1334 SIG2OSIG(pending, td->td_retval[0]); 1335 return (0); 1336 } 1337 #endif /* COMPAT_43 */ 1338 1339 #if defined(COMPAT_43) 1340 /* 1341 * Generalized interface signal handler, 4.3-compatible. 1342 */ 1343 #ifndef _SYS_SYSPROTO_H_ 1344 struct osigvec_args { 1345 int signum; 1346 struct sigvec *nsv; 1347 struct sigvec *osv; 1348 }; 1349 #endif 1350 /* ARGSUSED */ 1351 int 1352 osigvec(td, uap) 1353 struct thread *td; 1354 register struct osigvec_args *uap; 1355 { 1356 struct sigvec vec; 1357 struct sigaction nsa, osa; 1358 register struct sigaction *nsap, *osap; 1359 int error; 1360 1361 if (uap->signum <= 0 || uap->signum >= ONSIG) 1362 return (EINVAL); 1363 nsap = (uap->nsv != NULL) ? &nsa : NULL; 1364 osap = (uap->osv != NULL) ? &osa : NULL; 1365 if (nsap) { 1366 error = copyin(uap->nsv, &vec, sizeof(vec)); 1367 if (error) 1368 return (error); 1369 nsap->sa_handler = vec.sv_handler; 1370 OSIG2SIG(vec.sv_mask, nsap->sa_mask); 1371 nsap->sa_flags = vec.sv_flags; 1372 nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */ 1373 } 1374 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET); 1375 if (osap && !error) { 1376 vec.sv_handler = osap->sa_handler; 1377 SIG2OSIG(osap->sa_mask, vec.sv_mask); 1378 vec.sv_flags = osap->sa_flags; 1379 vec.sv_flags &= ~SA_NOCLDWAIT; 1380 vec.sv_flags ^= SA_RESTART; 1381 error = copyout(&vec, uap->osv, sizeof(vec)); 1382 } 1383 return (error); 1384 } 1385 1386 #ifndef _SYS_SYSPROTO_H_ 1387 struct osigblock_args { 1388 int mask; 1389 }; 1390 #endif 1391 int 1392 osigblock(td, uap) 1393 register struct thread *td; 1394 struct osigblock_args *uap; 1395 { 1396 struct proc *p = td->td_proc; 1397 sigset_t set; 1398 1399 OSIG2SIG(uap->mask, set); 1400 SIG_CANTMASK(set); 1401 PROC_LOCK(p); 1402 SIG2OSIG(td->td_sigmask, td->td_retval[0]); 1403 SIGSETOR(td->td_sigmask, set); 1404 PROC_UNLOCK(p); 1405 return (0); 1406 } 1407 1408 #ifndef _SYS_SYSPROTO_H_ 1409 struct osigsetmask_args { 1410 int mask; 1411 }; 1412 #endif 1413 int 1414 osigsetmask(td, uap) 1415 struct thread *td; 1416 struct osigsetmask_args *uap; 1417 { 1418 struct proc *p = td->td_proc; 1419 sigset_t set; 1420 1421 OSIG2SIG(uap->mask, set); 1422 SIG_CANTMASK(set); 1423 PROC_LOCK(p); 1424 SIG2OSIG(td->td_sigmask, td->td_retval[0]); 1425 SIGSETLO(td->td_sigmask, set); 1426 signotify(td); 1427 PROC_UNLOCK(p); 1428 return (0); 1429 } 1430 #endif /* COMPAT_43 */ 1431 1432 /* 1433 * Suspend calling thread until signal, providing mask to be set in the 1434 * meantime. 1435 */ 1436 #ifndef _SYS_SYSPROTO_H_ 1437 struct sigsuspend_args { 1438 const sigset_t *sigmask; 1439 }; 1440 #endif 1441 /* ARGSUSED */ 1442 int 1443 sigsuspend(td, uap) 1444 struct thread *td; 1445 struct sigsuspend_args *uap; 1446 { 1447 sigset_t mask; 1448 int error; 1449 1450 error = copyin(uap->sigmask, &mask, sizeof(mask)); 1451 if (error) 1452 return (error); 1453 return (kern_sigsuspend(td, mask)); 1454 } 1455 1456 int 1457 kern_sigsuspend(struct thread *td, sigset_t mask) 1458 { 1459 struct proc *p = td->td_proc; 1460 1461 /* 1462 * When returning from sigsuspend, we want 1463 * the old mask to be restored after the 1464 * signal handler has finished. Thus, we 1465 * save it here and mark the sigacts structure 1466 * to indicate this. 1467 */ 1468 PROC_LOCK(p); 1469 td->td_oldsigmask = td->td_sigmask; 1470 td->td_pflags |= TDP_OLDMASK; 1471 SIG_CANTMASK(mask); 1472 td->td_sigmask = mask; 1473 signotify(td); 1474 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "pause", 0) == 0) 1475 /* void */; 1476 PROC_UNLOCK(p); 1477 /* always return EINTR rather than ERESTART... */ 1478 return (EINTR); 1479 } 1480 1481 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */ 1482 /* 1483 * Compatibility sigsuspend call for old binaries. Note nonstandard calling 1484 * convention: libc stub passes mask, not pointer, to save a copyin. 1485 */ 1486 #ifndef _SYS_SYSPROTO_H_ 1487 struct osigsuspend_args { 1488 osigset_t mask; 1489 }; 1490 #endif 1491 /* ARGSUSED */ 1492 int 1493 osigsuspend(td, uap) 1494 struct thread *td; 1495 struct osigsuspend_args *uap; 1496 { 1497 struct proc *p = td->td_proc; 1498 sigset_t mask; 1499 1500 PROC_LOCK(p); 1501 td->td_oldsigmask = td->td_sigmask; 1502 td->td_pflags |= TDP_OLDMASK; 1503 OSIG2SIG(uap->mask, mask); 1504 SIG_CANTMASK(mask); 1505 SIGSETLO(td->td_sigmask, mask); 1506 signotify(td); 1507 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "opause", 0) == 0) 1508 /* void */; 1509 PROC_UNLOCK(p); 1510 /* always return EINTR rather than ERESTART... */ 1511 return (EINTR); 1512 } 1513 #endif /* COMPAT_43 */ 1514 1515 #if defined(COMPAT_43) 1516 #ifndef _SYS_SYSPROTO_H_ 1517 struct osigstack_args { 1518 struct sigstack *nss; 1519 struct sigstack *oss; 1520 }; 1521 #endif 1522 /* ARGSUSED */ 1523 int 1524 osigstack(td, uap) 1525 struct thread *td; 1526 register struct osigstack_args *uap; 1527 { 1528 struct sigstack nss, oss; 1529 int error = 0; 1530 1531 if (uap->nss != NULL) { 1532 error = copyin(uap->nss, &nss, sizeof(nss)); 1533 if (error) 1534 return (error); 1535 } 1536 oss.ss_sp = td->td_sigstk.ss_sp; 1537 oss.ss_onstack = sigonstack(cpu_getstack(td)); 1538 if (uap->nss != NULL) { 1539 td->td_sigstk.ss_sp = nss.ss_sp; 1540 td->td_sigstk.ss_size = 0; 1541 td->td_sigstk.ss_flags |= nss.ss_onstack & SS_ONSTACK; 1542 td->td_pflags |= TDP_ALTSTACK; 1543 } 1544 if (uap->oss != NULL) 1545 error = copyout(&oss, uap->oss, sizeof(oss)); 1546 1547 return (error); 1548 } 1549 #endif /* COMPAT_43 */ 1550 1551 #ifndef _SYS_SYSPROTO_H_ 1552 struct sigaltstack_args { 1553 stack_t *ss; 1554 stack_t *oss; 1555 }; 1556 #endif 1557 /* ARGSUSED */ 1558 int 1559 sigaltstack(td, uap) 1560 struct thread *td; 1561 register struct sigaltstack_args *uap; 1562 { 1563 stack_t ss, oss; 1564 int error; 1565 1566 if (uap->ss != NULL) { 1567 error = copyin(uap->ss, &ss, sizeof(ss)); 1568 if (error) 1569 return (error); 1570 } 1571 error = kern_sigaltstack(td, (uap->ss != NULL) ? &ss : NULL, 1572 (uap->oss != NULL) ? &oss : NULL); 1573 if (error) 1574 return (error); 1575 if (uap->oss != NULL) 1576 error = copyout(&oss, uap->oss, sizeof(stack_t)); 1577 return (error); 1578 } 1579 1580 int 1581 kern_sigaltstack(struct thread *td, stack_t *ss, stack_t *oss) 1582 { 1583 struct proc *p = td->td_proc; 1584 int oonstack; 1585 1586 oonstack = sigonstack(cpu_getstack(td)); 1587 1588 if (oss != NULL) { 1589 *oss = td->td_sigstk; 1590 oss->ss_flags = (td->td_pflags & TDP_ALTSTACK) 1591 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 1592 } 1593 1594 if (ss != NULL) { 1595 if (oonstack) 1596 return (EPERM); 1597 if ((ss->ss_flags & ~SS_DISABLE) != 0) 1598 return (EINVAL); 1599 if (!(ss->ss_flags & SS_DISABLE)) { 1600 if (ss->ss_size < p->p_sysent->sv_minsigstksz) 1601 return (ENOMEM); 1602 1603 td->td_sigstk = *ss; 1604 td->td_pflags |= TDP_ALTSTACK; 1605 } else { 1606 td->td_pflags &= ~TDP_ALTSTACK; 1607 } 1608 } 1609 return (0); 1610 } 1611 1612 /* 1613 * Common code for kill process group/broadcast kill. 1614 * cp is calling process. 1615 */ 1616 static int 1617 killpg1(td, sig, pgid, all) 1618 register struct thread *td; 1619 int sig, pgid, all; 1620 { 1621 register struct proc *p; 1622 struct pgrp *pgrp; 1623 int err; 1624 int ret; 1625 1626 ret = ESRCH; 1627 if (all) { 1628 /* 1629 * broadcast 1630 */ 1631 sx_slock(&allproc_lock); 1632 FOREACH_PROC_IN_SYSTEM(p) { 1633 PROC_LOCK(p); 1634 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM || 1635 p == td->td_proc || p->p_state == PRS_NEW) { 1636 PROC_UNLOCK(p); 1637 continue; 1638 } 1639 err = p_cansignal(td, p, sig); 1640 if (err == 0) { 1641 if (sig) 1642 psignal(p, sig); 1643 ret = err; 1644 } 1645 else if (ret == ESRCH) 1646 ret = err; 1647 PROC_UNLOCK(p); 1648 } 1649 sx_sunlock(&allproc_lock); 1650 } else { 1651 sx_slock(&proctree_lock); 1652 if (pgid == 0) { 1653 /* 1654 * zero pgid means send to my process group. 1655 */ 1656 pgrp = td->td_proc->p_pgrp; 1657 PGRP_LOCK(pgrp); 1658 } else { 1659 pgrp = pgfind(pgid); 1660 if (pgrp == NULL) { 1661 sx_sunlock(&proctree_lock); 1662 return (ESRCH); 1663 } 1664 } 1665 sx_sunlock(&proctree_lock); 1666 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) { 1667 PROC_LOCK(p); 1668 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM || 1669 p->p_state == PRS_NEW ) { 1670 PROC_UNLOCK(p); 1671 continue; 1672 } 1673 err = p_cansignal(td, p, sig); 1674 if (err == 0) { 1675 if (sig) 1676 psignal(p, sig); 1677 ret = err; 1678 } 1679 else if (ret == ESRCH) 1680 ret = err; 1681 PROC_UNLOCK(p); 1682 } 1683 PGRP_UNLOCK(pgrp); 1684 } 1685 return (ret); 1686 } 1687 1688 #ifndef _SYS_SYSPROTO_H_ 1689 struct kill_args { 1690 int pid; 1691 int signum; 1692 }; 1693 #endif 1694 /* ARGSUSED */ 1695 int 1696 kill(td, uap) 1697 register struct thread *td; 1698 register struct kill_args *uap; 1699 { 1700 register struct proc *p; 1701 int error; 1702 1703 AUDIT_ARG(signum, uap->signum); 1704 AUDIT_ARG(pid, uap->pid); 1705 if ((u_int)uap->signum > _SIG_MAXSIG) 1706 return (EINVAL); 1707 1708 if (uap->pid > 0) { 1709 /* kill single process */ 1710 if ((p = pfind(uap->pid)) == NULL) { 1711 if ((p = zpfind(uap->pid)) == NULL) 1712 return (ESRCH); 1713 } 1714 AUDIT_ARG(process, p); 1715 error = p_cansignal(td, p, uap->signum); 1716 if (error == 0 && uap->signum) 1717 psignal(p, uap->signum); 1718 PROC_UNLOCK(p); 1719 return (error); 1720 } 1721 switch (uap->pid) { 1722 case -1: /* broadcast signal */ 1723 return (killpg1(td, uap->signum, 0, 1)); 1724 case 0: /* signal own process group */ 1725 return (killpg1(td, uap->signum, 0, 0)); 1726 default: /* negative explicit process group */ 1727 return (killpg1(td, uap->signum, -uap->pid, 0)); 1728 } 1729 /* NOTREACHED */ 1730 } 1731 1732 #if defined(COMPAT_43) 1733 #ifndef _SYS_SYSPROTO_H_ 1734 struct okillpg_args { 1735 int pgid; 1736 int signum; 1737 }; 1738 #endif 1739 /* ARGSUSED */ 1740 int 1741 okillpg(td, uap) 1742 struct thread *td; 1743 register struct okillpg_args *uap; 1744 { 1745 1746 AUDIT_ARG(signum, uap->signum); 1747 AUDIT_ARG(pid, uap->pgid); 1748 if ((u_int)uap->signum > _SIG_MAXSIG) 1749 return (EINVAL); 1750 1751 return (killpg1(td, uap->signum, uap->pgid, 0)); 1752 } 1753 #endif /* COMPAT_43 */ 1754 1755 #ifndef _SYS_SYSPROTO_H_ 1756 struct sigqueue_args { 1757 pid_t pid; 1758 int signum; 1759 /* union sigval */ void *value; 1760 }; 1761 #endif 1762 int 1763 sigqueue(struct thread *td, struct sigqueue_args *uap) 1764 { 1765 ksiginfo_t ksi; 1766 struct proc *p; 1767 int error; 1768 1769 if ((u_int)uap->signum > _SIG_MAXSIG) 1770 return (EINVAL); 1771 1772 /* 1773 * Specification says sigqueue can only send signal to 1774 * single process. 1775 */ 1776 if (uap->pid <= 0) 1777 return (EINVAL); 1778 1779 if ((p = pfind(uap->pid)) == NULL) { 1780 if ((p = zpfind(uap->pid)) == NULL) 1781 return (ESRCH); 1782 } 1783 error = p_cansignal(td, p, uap->signum); 1784 if (error == 0 && uap->signum != 0) { 1785 ksiginfo_init(&ksi); 1786 ksi.ksi_signo = uap->signum; 1787 ksi.ksi_code = SI_QUEUE; 1788 ksi.ksi_pid = td->td_proc->p_pid; 1789 ksi.ksi_uid = td->td_ucred->cr_ruid; 1790 ksi.ksi_value.sival_ptr = uap->value; 1791 error = tdsignal(p, NULL, ksi.ksi_signo, &ksi); 1792 } 1793 PROC_UNLOCK(p); 1794 return (error); 1795 } 1796 1797 /* 1798 * Send a signal to a process group. 1799 */ 1800 void 1801 gsignal(pgid, sig) 1802 int pgid, sig; 1803 { 1804 struct pgrp *pgrp; 1805 1806 if (pgid != 0) { 1807 sx_slock(&proctree_lock); 1808 pgrp = pgfind(pgid); 1809 sx_sunlock(&proctree_lock); 1810 if (pgrp != NULL) { 1811 pgsignal(pgrp, sig, 0); 1812 PGRP_UNLOCK(pgrp); 1813 } 1814 } 1815 } 1816 1817 /* 1818 * Send a signal to a process group. If checktty is 1, 1819 * limit to members which have a controlling terminal. 1820 */ 1821 void 1822 pgsignal(pgrp, sig, checkctty) 1823 struct pgrp *pgrp; 1824 int sig, checkctty; 1825 { 1826 register struct proc *p; 1827 1828 if (pgrp) { 1829 PGRP_LOCK_ASSERT(pgrp, MA_OWNED); 1830 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) { 1831 PROC_LOCK(p); 1832 if (checkctty == 0 || p->p_flag & P_CONTROLT) 1833 psignal(p, sig); 1834 PROC_UNLOCK(p); 1835 } 1836 } 1837 } 1838 1839 /* 1840 * Send a signal caused by a trap to the current thread. If it will be 1841 * caught immediately, deliver it with correct code. Otherwise, post it 1842 * normally. 1843 */ 1844 void 1845 trapsignal(struct thread *td, ksiginfo_t *ksi) 1846 { 1847 struct sigacts *ps; 1848 struct proc *p; 1849 #ifdef KSE 1850 int error; 1851 #endif 1852 int sig; 1853 int code; 1854 1855 p = td->td_proc; 1856 sig = ksi->ksi_signo; 1857 code = ksi->ksi_code; 1858 KASSERT(_SIG_VALID(sig), ("invalid signal")); 1859 1860 #ifdef KSE 1861 if (td->td_pflags & TDP_SA) { 1862 if (td->td_mailbox == NULL) 1863 thread_user_enter(td); 1864 PROC_LOCK(p); 1865 SIGDELSET(td->td_sigmask, sig); 1866 thread_lock(td); 1867 /* 1868 * Force scheduling an upcall, so UTS has chance to 1869 * process the signal before thread runs again in 1870 * userland. 1871 */ 1872 if (td->td_upcall) 1873 td->td_upcall->ku_flags |= KUF_DOUPCALL; 1874 thread_unlock(td); 1875 } else { 1876 PROC_LOCK(p); 1877 } 1878 #else 1879 PROC_LOCK(p); 1880 #endif 1881 ps = p->p_sigacts; 1882 mtx_lock(&ps->ps_mtx); 1883 if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) && 1884 !SIGISMEMBER(td->td_sigmask, sig)) { 1885 td->td_ru.ru_nsignals++; 1886 #ifdef KTRACE 1887 if (KTRPOINT(curthread, KTR_PSIG)) 1888 ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)], 1889 &td->td_sigmask, code); 1890 #endif 1891 #ifdef KSE 1892 if (!(td->td_pflags & TDP_SA)) 1893 (*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)], 1894 ksi, &td->td_sigmask); 1895 #else 1896 (*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)], 1897 ksi, &td->td_sigmask); 1898 #endif 1899 #ifdef KSE 1900 else if (td->td_mailbox == NULL) { 1901 mtx_unlock(&ps->ps_mtx); 1902 /* UTS caused a sync signal */ 1903 p->p_code = code; /* XXX for core dump/debugger */ 1904 p->p_sig = sig; /* XXX to verify code */ 1905 sigexit(td, sig); 1906 } else { 1907 mtx_unlock(&ps->ps_mtx); 1908 SIGADDSET(td->td_sigmask, sig); 1909 PROC_UNLOCK(p); 1910 error = copyout(&ksi->ksi_info, &td->td_mailbox->tm_syncsig, 1911 sizeof(siginfo_t)); 1912 PROC_LOCK(p); 1913 /* UTS memory corrupted */ 1914 if (error) 1915 sigexit(td, SIGSEGV); 1916 mtx_lock(&ps->ps_mtx); 1917 } 1918 #endif 1919 SIGSETOR(td->td_sigmask, ps->ps_catchmask[_SIG_IDX(sig)]); 1920 if (!SIGISMEMBER(ps->ps_signodefer, sig)) 1921 SIGADDSET(td->td_sigmask, sig); 1922 if (SIGISMEMBER(ps->ps_sigreset, sig)) { 1923 /* 1924 * See kern_sigaction() for origin of this code. 1925 */ 1926 SIGDELSET(ps->ps_sigcatch, sig); 1927 if (sig != SIGCONT && 1928 sigprop(sig) & SA_IGNORE) 1929 SIGADDSET(ps->ps_sigignore, sig); 1930 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL; 1931 } 1932 mtx_unlock(&ps->ps_mtx); 1933 } else { 1934 /* 1935 * Avoid a possible infinite loop if the thread 1936 * masking the signal or process is ignoring the 1937 * signal. 1938 */ 1939 if (kern_forcesigexit && 1940 (SIGISMEMBER(td->td_sigmask, sig) || 1941 ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN)) { 1942 SIGDELSET(td->td_sigmask, sig); 1943 SIGDELSET(ps->ps_sigcatch, sig); 1944 SIGDELSET(ps->ps_sigignore, sig); 1945 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL; 1946 } 1947 mtx_unlock(&ps->ps_mtx); 1948 p->p_code = code; /* XXX for core dump/debugger */ 1949 p->p_sig = sig; /* XXX to verify code */ 1950 tdsignal(p, td, sig, ksi); 1951 } 1952 PROC_UNLOCK(p); 1953 } 1954 1955 static struct thread * 1956 sigtd(struct proc *p, int sig, int prop) 1957 { 1958 struct thread *td, *signal_td; 1959 1960 PROC_LOCK_ASSERT(p, MA_OWNED); 1961 1962 /* 1963 * Check if current thread can handle the signal without 1964 * switching context to another thread. 1965 */ 1966 if (curproc == p && !SIGISMEMBER(curthread->td_sigmask, sig)) 1967 return (curthread); 1968 signal_td = NULL; 1969 PROC_SLOCK(p); 1970 FOREACH_THREAD_IN_PROC(p, td) { 1971 if (!SIGISMEMBER(td->td_sigmask, sig)) { 1972 signal_td = td; 1973 break; 1974 } 1975 } 1976 if (signal_td == NULL) 1977 signal_td = FIRST_THREAD_IN_PROC(p); 1978 PROC_SUNLOCK(p); 1979 return (signal_td); 1980 } 1981 1982 /* 1983 * Send the signal to the process. If the signal has an action, the action 1984 * is usually performed by the target process rather than the caller; we add 1985 * the signal to the set of pending signals for the process. 1986 * 1987 * Exceptions: 1988 * o When a stop signal is sent to a sleeping process that takes the 1989 * default action, the process is stopped without awakening it. 1990 * o SIGCONT restarts stopped processes (or puts them back to sleep) 1991 * regardless of the signal action (eg, blocked or ignored). 1992 * 1993 * Other ignored signals are discarded immediately. 1994 * 1995 * NB: This function may be entered from the debugger via the "kill" DDB 1996 * command. There is little that can be done to mitigate the possibly messy 1997 * side effects of this unwise possibility. 1998 */ 1999 void 2000 psignal(struct proc *p, int sig) 2001 { 2002 (void) tdsignal(p, NULL, sig, NULL); 2003 } 2004 2005 int 2006 psignal_event(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi) 2007 { 2008 struct thread *td = NULL; 2009 2010 PROC_LOCK_ASSERT(p, MA_OWNED); 2011 2012 KASSERT(!KSI_ONQ(ksi), ("psignal_event: ksi on queue")); 2013 2014 /* 2015 * ksi_code and other fields should be set before 2016 * calling this function. 2017 */ 2018 ksi->ksi_signo = sigev->sigev_signo; 2019 ksi->ksi_value = sigev->sigev_value; 2020 if (sigev->sigev_notify == SIGEV_THREAD_ID) { 2021 td = thread_find(p, sigev->sigev_notify_thread_id); 2022 if (td == NULL) 2023 return (ESRCH); 2024 } 2025 return (tdsignal(p, td, ksi->ksi_signo, ksi)); 2026 } 2027 2028 int 2029 tdsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi) 2030 { 2031 #ifdef KSE 2032 sigset_t saved; 2033 int ret; 2034 2035 if (p->p_flag & P_SA) 2036 saved = p->p_sigqueue.sq_signals; 2037 ret = do_tdsignal(p, td, sig, ksi); 2038 if ((p->p_flag & P_SA) && !(p->p_flag & P_SIGEVENT)) { 2039 if (!SIGSETEQ(saved, p->p_sigqueue.sq_signals)) { 2040 /* pending set changed */ 2041 p->p_flag |= P_SIGEVENT; 2042 wakeup(&p->p_siglist); 2043 } 2044 } 2045 return (ret); 2046 } 2047 2048 static int 2049 do_tdsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi) 2050 { 2051 #endif 2052 sig_t action; 2053 sigqueue_t *sigqueue; 2054 int prop; 2055 struct sigacts *ps; 2056 int intrval; 2057 int ret = 0; 2058 int wakeup_swapper; 2059 2060 PROC_LOCK_ASSERT(p, MA_OWNED); 2061 2062 if (!_SIG_VALID(sig)) 2063 #ifdef KSE 2064 panic("do_tdsignal(): invalid signal %d", sig); 2065 #else 2066 panic("tdsignal(): invalid signal %d", sig); 2067 #endif 2068 2069 #ifdef KSE 2070 KASSERT(ksi == NULL || !KSI_ONQ(ksi), ("do_tdsignal: ksi on queue")); 2071 #else 2072 KASSERT(ksi == NULL || !KSI_ONQ(ksi), ("tdsignal: ksi on queue")); 2073 #endif 2074 2075 /* 2076 * IEEE Std 1003.1-2001: return success when killing a zombie. 2077 */ 2078 if (p->p_state == PRS_ZOMBIE) { 2079 if (ksi && (ksi->ksi_flags & KSI_INS)) 2080 ksiginfo_tryfree(ksi); 2081 return (ret); 2082 } 2083 2084 ps = p->p_sigacts; 2085 KNOTE_LOCKED(&p->p_klist, NOTE_SIGNAL | sig); 2086 prop = sigprop(sig); 2087 2088 /* 2089 * If the signal is blocked and not destined for this thread, then 2090 * assign it to the process so that we can find it later in the first 2091 * thread that unblocks it. Otherwise, assign it to this thread now. 2092 */ 2093 if (td == NULL) { 2094 td = sigtd(p, sig, prop); 2095 if (SIGISMEMBER(td->td_sigmask, sig)) 2096 sigqueue = &p->p_sigqueue; 2097 else 2098 sigqueue = &td->td_sigqueue; 2099 } else { 2100 KASSERT(td->td_proc == p, ("invalid thread")); 2101 sigqueue = &td->td_sigqueue; 2102 } 2103 2104 /* 2105 * If the signal is being ignored, 2106 * then we forget about it immediately. 2107 * (Note: we don't set SIGCONT in ps_sigignore, 2108 * and if it is set to SIG_IGN, 2109 * action will be SIG_DFL here.) 2110 */ 2111 mtx_lock(&ps->ps_mtx); 2112 if (SIGISMEMBER(ps->ps_sigignore, sig)) { 2113 mtx_unlock(&ps->ps_mtx); 2114 if (ksi && (ksi->ksi_flags & KSI_INS)) 2115 ksiginfo_tryfree(ksi); 2116 return (ret); 2117 } 2118 if (SIGISMEMBER(td->td_sigmask, sig)) 2119 action = SIG_HOLD; 2120 else if (SIGISMEMBER(ps->ps_sigcatch, sig)) 2121 action = SIG_CATCH; 2122 else 2123 action = SIG_DFL; 2124 if (SIGISMEMBER(ps->ps_sigintr, sig)) 2125 intrval = EINTR; 2126 else 2127 intrval = ERESTART; 2128 mtx_unlock(&ps->ps_mtx); 2129 2130 if (prop & SA_CONT) 2131 sigqueue_delete_stopmask_proc(p); 2132 else if (prop & SA_STOP) { 2133 /* 2134 * If sending a tty stop signal to a member of an orphaned 2135 * process group, discard the signal here if the action 2136 * is default; don't stop the process below if sleeping, 2137 * and don't clear any pending SIGCONT. 2138 */ 2139 if ((prop & SA_TTYSTOP) && 2140 (p->p_pgrp->pg_jobc == 0) && 2141 (action == SIG_DFL)) { 2142 if (ksi && (ksi->ksi_flags & KSI_INS)) 2143 ksiginfo_tryfree(ksi); 2144 return (ret); 2145 } 2146 sigqueue_delete_proc(p, SIGCONT); 2147 if (p->p_flag & P_CONTINUED) { 2148 p->p_flag &= ~P_CONTINUED; 2149 PROC_LOCK(p->p_pptr); 2150 sigqueue_take(p->p_ksi); 2151 PROC_UNLOCK(p->p_pptr); 2152 } 2153 } 2154 2155 ret = sigqueue_add(sigqueue, sig, ksi); 2156 if (ret != 0) 2157 return (ret); 2158 signotify(td); 2159 /* 2160 * Defer further processing for signals which are held, 2161 * except that stopped processes must be continued by SIGCONT. 2162 */ 2163 if (action == SIG_HOLD && 2164 !((prop & SA_CONT) && (p->p_flag & P_STOPPED_SIG))) 2165 return (ret); 2166 /* 2167 * SIGKILL: Remove procfs STOPEVENTs. 2168 */ 2169 if (sig == SIGKILL) { 2170 /* from procfs_ioctl.c: PIOCBIC */ 2171 p->p_stops = 0; 2172 /* from procfs_ioctl.c: PIOCCONT */ 2173 p->p_step = 0; 2174 wakeup(&p->p_step); 2175 } 2176 /* 2177 * Some signals have a process-wide effect and a per-thread 2178 * component. Most processing occurs when the process next 2179 * tries to cross the user boundary, however there are some 2180 * times when processing needs to be done immediatly, such as 2181 * waking up threads so that they can cross the user boundary. 2182 * We try do the per-process part here. 2183 */ 2184 PROC_SLOCK(p); 2185 if (P_SHOULDSTOP(p)) { 2186 /* 2187 * The process is in stopped mode. All the threads should be 2188 * either winding down or already on the suspended queue. 2189 */ 2190 if (p->p_flag & P_TRACED) { 2191 /* 2192 * The traced process is already stopped, 2193 * so no further action is necessary. 2194 * No signal can restart us. 2195 */ 2196 PROC_SUNLOCK(p); 2197 goto out; 2198 } 2199 2200 if (sig == SIGKILL) { 2201 /* 2202 * SIGKILL sets process running. 2203 * It will die elsewhere. 2204 * All threads must be restarted. 2205 */ 2206 p->p_flag &= ~P_STOPPED_SIG; 2207 goto runfast; 2208 } 2209 2210 if (prop & SA_CONT) { 2211 /* 2212 * If SIGCONT is default (or ignored), we continue the 2213 * process but don't leave the signal in sigqueue as 2214 * it has no further action. If SIGCONT is held, we 2215 * continue the process and leave the signal in 2216 * sigqueue. If the process catches SIGCONT, let it 2217 * handle the signal itself. If it isn't waiting on 2218 * an event, it goes back to run state. 2219 * Otherwise, process goes back to sleep state. 2220 */ 2221 p->p_flag &= ~P_STOPPED_SIG; 2222 if (p->p_numthreads == p->p_suspcount) { 2223 PROC_SUNLOCK(p); 2224 p->p_flag |= P_CONTINUED; 2225 p->p_xstat = SIGCONT; 2226 PROC_LOCK(p->p_pptr); 2227 childproc_continued(p); 2228 PROC_UNLOCK(p->p_pptr); 2229 PROC_SLOCK(p); 2230 } 2231 if (action == SIG_DFL) { 2232 thread_unsuspend(p); 2233 PROC_SUNLOCK(p); 2234 sigqueue_delete(sigqueue, sig); 2235 goto out; 2236 } 2237 if (action == SIG_CATCH) { 2238 #ifdef KSE 2239 /* 2240 * The process wants to catch it so it needs 2241 * to run at least one thread, but which one? 2242 * It would seem that the answer would be to 2243 * run an upcall in the next KSE to run, and 2244 * deliver the signal that way. In a NON KSE 2245 * process, we need to make sure that the 2246 * single thread is runnable asap. 2247 * XXXKSE for now however, make them all run. 2248 */ 2249 #endif 2250 /* 2251 * The process wants to catch it so it needs 2252 * to run at least one thread, but which one? 2253 */ 2254 goto runfast; 2255 } 2256 /* 2257 * The signal is not ignored or caught. 2258 */ 2259 thread_unsuspend(p); 2260 PROC_SUNLOCK(p); 2261 goto out; 2262 } 2263 2264 if (prop & SA_STOP) { 2265 /* 2266 * Already stopped, don't need to stop again 2267 * (If we did the shell could get confused). 2268 * Just make sure the signal STOP bit set. 2269 */ 2270 PROC_SUNLOCK(p); 2271 p->p_flag |= P_STOPPED_SIG; 2272 sigqueue_delete(sigqueue, sig); 2273 goto out; 2274 } 2275 2276 /* 2277 * All other kinds of signals: 2278 * If a thread is sleeping interruptibly, simulate a 2279 * wakeup so that when it is continued it will be made 2280 * runnable and can look at the signal. However, don't make 2281 * the PROCESS runnable, leave it stopped. 2282 * It may run a bit until it hits a thread_suspend_check(). 2283 */ 2284 wakeup_swapper = 0; 2285 thread_lock(td); 2286 if (TD_ON_SLEEPQ(td) && (td->td_flags & TDF_SINTR)) 2287 wakeup_swapper = sleepq_abort(td, intrval); 2288 thread_unlock(td); 2289 PROC_SUNLOCK(p); 2290 if (wakeup_swapper) 2291 kick_proc0(); 2292 goto out; 2293 /* 2294 * Mutexes are short lived. Threads waiting on them will 2295 * hit thread_suspend_check() soon. 2296 */ 2297 } else if (p->p_state == PRS_NORMAL) { 2298 if (p->p_flag & P_TRACED || action == SIG_CATCH) { 2299 thread_lock(td); 2300 wakeup_swapper = tdsigwakeup(td, sig, action, intrval); 2301 thread_unlock(td); 2302 PROC_SUNLOCK(p); 2303 if (wakeup_swapper) 2304 kick_proc0(); 2305 goto out; 2306 } 2307 2308 MPASS(action == SIG_DFL); 2309 2310 if (prop & SA_STOP) { 2311 if (p->p_flag & P_PPWAIT) { 2312 PROC_SUNLOCK(p); 2313 goto out; 2314 } 2315 p->p_flag |= P_STOPPED_SIG; 2316 p->p_xstat = sig; 2317 sig_suspend_threads(td, p, 1); 2318 if (p->p_numthreads == p->p_suspcount) { 2319 /* 2320 * only thread sending signal to another 2321 * process can reach here, if thread is sending 2322 * signal to its process, because thread does 2323 * not suspend itself here, p_numthreads 2324 * should never be equal to p_suspcount. 2325 */ 2326 thread_stopped(p); 2327 PROC_SUNLOCK(p); 2328 sigqueue_delete_proc(p, p->p_xstat); 2329 } else 2330 PROC_SUNLOCK(p); 2331 goto out; 2332 } 2333 else 2334 goto runfast; 2335 /* NOTREACHED */ 2336 } else { 2337 /* Not in "NORMAL" state. discard the signal. */ 2338 PROC_SUNLOCK(p); 2339 sigqueue_delete(sigqueue, sig); 2340 goto out; 2341 } 2342 2343 /* 2344 * The process is not stopped so we need to apply the signal to all the 2345 * running threads. 2346 */ 2347 2348 runfast: 2349 thread_lock(td); 2350 wakeup_swapper = tdsigwakeup(td, sig, action, intrval); 2351 thread_unlock(td); 2352 thread_unsuspend(p); 2353 PROC_SUNLOCK(p); 2354 if (wakeup_swapper) 2355 kick_proc0(); 2356 out: 2357 /* If we jump here, proc slock should not be owned. */ 2358 PROC_SLOCK_ASSERT(p, MA_NOTOWNED); 2359 return (ret); 2360 } 2361 2362 /* 2363 * The force of a signal has been directed against a single 2364 * thread. We need to see what we can do about knocking it 2365 * out of any sleep it may be in etc. 2366 */ 2367 static int 2368 tdsigwakeup(struct thread *td, int sig, sig_t action, int intrval) 2369 { 2370 struct proc *p = td->td_proc; 2371 register int prop; 2372 int wakeup_swapper; 2373 2374 wakeup_swapper = 0; 2375 PROC_LOCK_ASSERT(p, MA_OWNED); 2376 PROC_SLOCK_ASSERT(p, MA_OWNED); 2377 THREAD_LOCK_ASSERT(td, MA_OWNED); 2378 prop = sigprop(sig); 2379 2380 /* 2381 * Bring the priority of a thread up if we want it to get 2382 * killed in this lifetime. 2383 */ 2384 if (action == SIG_DFL && (prop & SA_KILL) && td->td_priority > PUSER) 2385 sched_prio(td, PUSER); 2386 2387 if (TD_ON_SLEEPQ(td)) { 2388 /* 2389 * If thread is sleeping uninterruptibly 2390 * we can't interrupt the sleep... the signal will 2391 * be noticed when the process returns through 2392 * trap() or syscall(). 2393 */ 2394 if ((td->td_flags & TDF_SINTR) == 0) 2395 return (0); 2396 /* 2397 * If SIGCONT is default (or ignored) and process is 2398 * asleep, we are finished; the process should not 2399 * be awakened. 2400 */ 2401 if ((prop & SA_CONT) && action == SIG_DFL) { 2402 thread_unlock(td); 2403 PROC_SUNLOCK(p); 2404 sigqueue_delete(&p->p_sigqueue, sig); 2405 /* 2406 * It may be on either list in this state. 2407 * Remove from both for now. 2408 */ 2409 sigqueue_delete(&td->td_sigqueue, sig); 2410 PROC_SLOCK(p); 2411 thread_lock(td); 2412 return (0); 2413 } 2414 2415 /* 2416 * Give low priority threads a better chance to run. 2417 */ 2418 if (td->td_priority > PUSER) 2419 sched_prio(td, PUSER); 2420 2421 wakeup_swapper = sleepq_abort(td, intrval); 2422 } else { 2423 /* 2424 * Other states do nothing with the signal immediately, 2425 * other than kicking ourselves if we are running. 2426 * It will either never be noticed, or noticed very soon. 2427 */ 2428 #ifdef SMP 2429 if (TD_IS_RUNNING(td) && td != curthread) 2430 forward_signal(td); 2431 #endif 2432 } 2433 return (wakeup_swapper); 2434 } 2435 2436 static void 2437 sig_suspend_threads(struct thread *td, struct proc *p, int sending) 2438 { 2439 struct thread *td2; 2440 2441 PROC_LOCK_ASSERT(p, MA_OWNED); 2442 PROC_SLOCK_ASSERT(p, MA_OWNED); 2443 2444 FOREACH_THREAD_IN_PROC(p, td2) { 2445 thread_lock(td2); 2446 if ((TD_IS_SLEEPING(td2) || TD_IS_SWAPPED(td2)) && 2447 (td2->td_flags & TDF_SINTR) && 2448 !TD_IS_SUSPENDED(td2)) { 2449 thread_suspend_one(td2); 2450 } else { 2451 if (sending || td != td2) 2452 td2->td_flags |= TDF_ASTPENDING; 2453 #ifdef SMP 2454 if (TD_IS_RUNNING(td2) && td2 != td) 2455 forward_signal(td2); 2456 #endif 2457 } 2458 thread_unlock(td2); 2459 } 2460 } 2461 2462 int 2463 ptracestop(struct thread *td, int sig) 2464 { 2465 struct proc *p = td->td_proc; 2466 2467 PROC_LOCK_ASSERT(p, MA_OWNED); 2468 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, 2469 &p->p_mtx.lock_object, "Stopping for traced signal"); 2470 2471 thread_lock(td); 2472 td->td_flags |= TDF_XSIG; 2473 thread_unlock(td); 2474 td->td_xsig = sig; 2475 PROC_SLOCK(p); 2476 while ((p->p_flag & P_TRACED) && (td->td_flags & TDF_XSIG)) { 2477 if (p->p_flag & P_SINGLE_EXIT) { 2478 thread_lock(td); 2479 td->td_flags &= ~TDF_XSIG; 2480 thread_unlock(td); 2481 PROC_SUNLOCK(p); 2482 return (sig); 2483 } 2484 /* 2485 * Just make wait() to work, the last stopped thread 2486 * will win. 2487 */ 2488 p->p_xstat = sig; 2489 p->p_xthread = td; 2490 p->p_flag |= (P_STOPPED_SIG|P_STOPPED_TRACE); 2491 sig_suspend_threads(td, p, 0); 2492 stopme: 2493 thread_suspend_switch(td); 2494 if (!(p->p_flag & P_TRACED)) { 2495 break; 2496 } 2497 if (td->td_flags & TDF_DBSUSPEND) { 2498 if (p->p_flag & P_SINGLE_EXIT) 2499 break; 2500 goto stopme; 2501 } 2502 } 2503 PROC_SUNLOCK(p); 2504 return (td->td_xsig); 2505 } 2506 2507 /* 2508 * If the current process has received a signal (should be caught or cause 2509 * termination, should interrupt current syscall), return the signal number. 2510 * Stop signals with default action are processed immediately, then cleared; 2511 * they aren't returned. This is checked after each entry to the system for 2512 * a syscall or trap (though this can usually be done without calling issignal 2513 * by checking the pending signal masks in cursig.) The normal call 2514 * sequence is 2515 * 2516 * while (sig = cursig(curthread)) 2517 * postsig(sig); 2518 */ 2519 static int 2520 issignal(td) 2521 struct thread *td; 2522 { 2523 struct proc *p; 2524 struct sigacts *ps; 2525 sigset_t sigpending; 2526 int sig, prop, newsig; 2527 2528 p = td->td_proc; 2529 ps = p->p_sigacts; 2530 mtx_assert(&ps->ps_mtx, MA_OWNED); 2531 PROC_LOCK_ASSERT(p, MA_OWNED); 2532 for (;;) { 2533 int traced = (p->p_flag & P_TRACED) || (p->p_stops & S_SIG); 2534 2535 sigpending = td->td_sigqueue.sq_signals; 2536 SIGSETNAND(sigpending, td->td_sigmask); 2537 2538 if (p->p_flag & P_PPWAIT) 2539 SIG_STOPSIGMASK(sigpending); 2540 if (SIGISEMPTY(sigpending)) /* no signal to send */ 2541 return (0); 2542 sig = sig_ffs(&sigpending); 2543 2544 if (p->p_stops & S_SIG) { 2545 mtx_unlock(&ps->ps_mtx); 2546 stopevent(p, S_SIG, sig); 2547 mtx_lock(&ps->ps_mtx); 2548 } 2549 2550 /* 2551 * We should see pending but ignored signals 2552 * only if P_TRACED was on when they were posted. 2553 */ 2554 if (SIGISMEMBER(ps->ps_sigignore, sig) && (traced == 0)) { 2555 sigqueue_delete(&td->td_sigqueue, sig); 2556 #ifdef KSE 2557 if (td->td_pflags & TDP_SA) 2558 SIGADDSET(td->td_sigmask, sig); 2559 #endif 2560 continue; 2561 } 2562 if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) { 2563 /* 2564 * If traced, always stop. 2565 */ 2566 mtx_unlock(&ps->ps_mtx); 2567 newsig = ptracestop(td, sig); 2568 mtx_lock(&ps->ps_mtx); 2569 2570 #ifdef KSE 2571 if (td->td_pflags & TDP_SA) 2572 SIGADDSET(td->td_sigmask, sig); 2573 2574 #endif 2575 if (sig != newsig) { 2576 ksiginfo_t ksi; 2577 /* 2578 * clear old signal. 2579 * XXX shrug off debugger, it causes siginfo to 2580 * be thrown away. 2581 */ 2582 sigqueue_get(&td->td_sigqueue, sig, &ksi); 2583 2584 /* 2585 * If parent wants us to take the signal, 2586 * then it will leave it in p->p_xstat; 2587 * otherwise we just look for signals again. 2588 */ 2589 if (newsig == 0) 2590 continue; 2591 sig = newsig; 2592 2593 /* 2594 * Put the new signal into td_sigqueue. If the 2595 * signal is being masked, look for other signals. 2596 */ 2597 SIGADDSET(td->td_sigqueue.sq_signals, sig); 2598 #ifdef KSE 2599 if (td->td_pflags & TDP_SA) 2600 SIGDELSET(td->td_sigmask, sig); 2601 #endif 2602 if (SIGISMEMBER(td->td_sigmask, sig)) 2603 continue; 2604 signotify(td); 2605 } 2606 2607 /* 2608 * If the traced bit got turned off, go back up 2609 * to the top to rescan signals. This ensures 2610 * that p_sig* and p_sigact are consistent. 2611 */ 2612 if ((p->p_flag & P_TRACED) == 0) 2613 continue; 2614 } 2615 2616 prop = sigprop(sig); 2617 2618 /* 2619 * Decide whether the signal should be returned. 2620 * Return the signal's number, or fall through 2621 * to clear it from the pending mask. 2622 */ 2623 switch ((intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) { 2624 2625 case (intptr_t)SIG_DFL: 2626 /* 2627 * Don't take default actions on system processes. 2628 */ 2629 if (p->p_pid <= 1) { 2630 #ifdef DIAGNOSTIC 2631 /* 2632 * Are you sure you want to ignore SIGSEGV 2633 * in init? XXX 2634 */ 2635 printf("Process (pid %lu) got signal %d\n", 2636 (u_long)p->p_pid, sig); 2637 #endif 2638 break; /* == ignore */ 2639 } 2640 /* 2641 * If there is a pending stop signal to process 2642 * with default action, stop here, 2643 * then clear the signal. However, 2644 * if process is member of an orphaned 2645 * process group, ignore tty stop signals. 2646 */ 2647 if (prop & SA_STOP) { 2648 if (p->p_flag & P_TRACED || 2649 (p->p_pgrp->pg_jobc == 0 && 2650 prop & SA_TTYSTOP)) 2651 break; /* == ignore */ 2652 mtx_unlock(&ps->ps_mtx); 2653 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, 2654 &p->p_mtx.lock_object, "Catching SIGSTOP"); 2655 p->p_flag |= P_STOPPED_SIG; 2656 p->p_xstat = sig; 2657 PROC_SLOCK(p); 2658 sig_suspend_threads(td, p, 0); 2659 thread_suspend_switch(td); 2660 PROC_SUNLOCK(p); 2661 mtx_lock(&ps->ps_mtx); 2662 break; 2663 } else if (prop & SA_IGNORE) { 2664 /* 2665 * Except for SIGCONT, shouldn't get here. 2666 * Default action is to ignore; drop it. 2667 */ 2668 break; /* == ignore */ 2669 } else 2670 return (sig); 2671 /*NOTREACHED*/ 2672 2673 case (intptr_t)SIG_IGN: 2674 /* 2675 * Masking above should prevent us ever trying 2676 * to take action on an ignored signal other 2677 * than SIGCONT, unless process is traced. 2678 */ 2679 if ((prop & SA_CONT) == 0 && 2680 (p->p_flag & P_TRACED) == 0) 2681 printf("issignal\n"); 2682 break; /* == ignore */ 2683 2684 default: 2685 /* 2686 * This signal has an action, let 2687 * postsig() process it. 2688 */ 2689 return (sig); 2690 } 2691 sigqueue_delete(&td->td_sigqueue, sig); /* take the signal! */ 2692 } 2693 /* NOTREACHED */ 2694 } 2695 2696 void 2697 thread_stopped(struct proc *p) 2698 { 2699 int n; 2700 2701 PROC_LOCK_ASSERT(p, MA_OWNED); 2702 PROC_SLOCK_ASSERT(p, MA_OWNED); 2703 n = p->p_suspcount; 2704 if (p == curproc) 2705 n++; 2706 if ((p->p_flag & P_STOPPED_SIG) && (n == p->p_numthreads)) { 2707 PROC_SUNLOCK(p); 2708 p->p_flag &= ~P_WAITED; 2709 PROC_LOCK(p->p_pptr); 2710 childproc_stopped(p, (p->p_flag & P_TRACED) ? 2711 CLD_TRAPPED : CLD_STOPPED); 2712 PROC_UNLOCK(p->p_pptr); 2713 PROC_SLOCK(p); 2714 } 2715 } 2716 2717 /* 2718 * Take the action for the specified signal 2719 * from the current set of pending signals. 2720 */ 2721 void 2722 postsig(sig) 2723 register int sig; 2724 { 2725 struct thread *td = curthread; 2726 register struct proc *p = td->td_proc; 2727 struct sigacts *ps; 2728 sig_t action; 2729 ksiginfo_t ksi; 2730 sigset_t returnmask; 2731 int code; 2732 2733 KASSERT(sig != 0, ("postsig")); 2734 2735 PROC_LOCK_ASSERT(p, MA_OWNED); 2736 ps = p->p_sigacts; 2737 mtx_assert(&ps->ps_mtx, MA_OWNED); 2738 ksiginfo_init(&ksi); 2739 sigqueue_get(&td->td_sigqueue, sig, &ksi); 2740 ksi.ksi_signo = sig; 2741 if (ksi.ksi_code == SI_TIMER) 2742 itimer_accept(p, ksi.ksi_timerid, &ksi); 2743 action = ps->ps_sigact[_SIG_IDX(sig)]; 2744 #ifdef KTRACE 2745 if (KTRPOINT(td, KTR_PSIG)) 2746 ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ? 2747 &td->td_oldsigmask : &td->td_sigmask, 0); 2748 #endif 2749 if (p->p_stops & S_SIG) { 2750 mtx_unlock(&ps->ps_mtx); 2751 stopevent(p, S_SIG, sig); 2752 mtx_lock(&ps->ps_mtx); 2753 } 2754 2755 #ifdef KSE 2756 if (!(td->td_pflags & TDP_SA) && action == SIG_DFL) { 2757 #else 2758 if (action == SIG_DFL) { 2759 #endif 2760 /* 2761 * Default action, where the default is to kill 2762 * the process. (Other cases were ignored above.) 2763 */ 2764 mtx_unlock(&ps->ps_mtx); 2765 sigexit(td, sig); 2766 /* NOTREACHED */ 2767 } else { 2768 #ifdef KSE 2769 if (td->td_pflags & TDP_SA) { 2770 if (sig == SIGKILL) { 2771 mtx_unlock(&ps->ps_mtx); 2772 sigexit(td, sig); 2773 } 2774 } 2775 2776 #endif 2777 /* 2778 * If we get here, the signal must be caught. 2779 */ 2780 KASSERT(action != SIG_IGN && !SIGISMEMBER(td->td_sigmask, sig), 2781 ("postsig action")); 2782 /* 2783 * Set the new mask value and also defer further 2784 * occurrences of this signal. 2785 * 2786 * Special case: user has done a sigsuspend. Here the 2787 * current mask is not of interest, but rather the 2788 * mask from before the sigsuspend is what we want 2789 * restored after the signal processing is completed. 2790 */ 2791 if (td->td_pflags & TDP_OLDMASK) { 2792 returnmask = td->td_oldsigmask; 2793 td->td_pflags &= ~TDP_OLDMASK; 2794 } else 2795 returnmask = td->td_sigmask; 2796 2797 SIGSETOR(td->td_sigmask, ps->ps_catchmask[_SIG_IDX(sig)]); 2798 if (!SIGISMEMBER(ps->ps_signodefer, sig)) 2799 SIGADDSET(td->td_sigmask, sig); 2800 2801 if (SIGISMEMBER(ps->ps_sigreset, sig)) { 2802 /* 2803 * See kern_sigaction() for origin of this code. 2804 */ 2805 SIGDELSET(ps->ps_sigcatch, sig); 2806 if (sig != SIGCONT && 2807 sigprop(sig) & SA_IGNORE) 2808 SIGADDSET(ps->ps_sigignore, sig); 2809 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL; 2810 } 2811 td->td_ru.ru_nsignals++; 2812 if (p->p_sig != sig) { 2813 code = 0; 2814 } else { 2815 code = p->p_code; 2816 p->p_code = 0; 2817 p->p_sig = 0; 2818 } 2819 #ifdef KSE 2820 if (td->td_pflags & TDP_SA) 2821 thread_signal_add(curthread, &ksi); 2822 else 2823 (*p->p_sysent->sv_sendsig)(action, &ksi, &returnmask); 2824 #else 2825 (*p->p_sysent->sv_sendsig)(action, &ksi, &returnmask); 2826 #endif 2827 } 2828 } 2829 2830 /* 2831 * Kill the current process for stated reason. 2832 */ 2833 void 2834 killproc(p, why) 2835 struct proc *p; 2836 char *why; 2837 { 2838 2839 PROC_LOCK_ASSERT(p, MA_OWNED); 2840 CTR3(KTR_PROC, "killproc: proc %p (pid %d, %s)", 2841 p, p->p_pid, p->p_comm); 2842 log(LOG_ERR, "pid %d (%s), uid %d, was killed: %s\n", p->p_pid, p->p_comm, 2843 p->p_ucred ? p->p_ucred->cr_uid : -1, why); 2844 psignal(p, SIGKILL); 2845 } 2846 2847 /* 2848 * Force the current process to exit with the specified signal, dumping core 2849 * if appropriate. We bypass the normal tests for masked and caught signals, 2850 * allowing unrecoverable failures to terminate the process without changing 2851 * signal state. Mark the accounting record with the signal termination. 2852 * If dumping core, save the signal number for the debugger. Calls exit and 2853 * does not return. 2854 */ 2855 void 2856 sigexit(td, sig) 2857 struct thread *td; 2858 int sig; 2859 { 2860 struct proc *p = td->td_proc; 2861 2862 PROC_LOCK_ASSERT(p, MA_OWNED); 2863 p->p_acflag |= AXSIG; 2864 /* 2865 * We must be single-threading to generate a core dump. This 2866 * ensures that the registers in the core file are up-to-date. 2867 * Also, the ELF dump handler assumes that the thread list doesn't 2868 * change out from under it. 2869 * 2870 * XXX If another thread attempts to single-thread before us 2871 * (e.g. via fork()), we won't get a dump at all. 2872 */ 2873 if ((sigprop(sig) & SA_CORE) && (thread_single(SINGLE_NO_EXIT) == 0)) { 2874 p->p_sig = sig; 2875 /* 2876 * Log signals which would cause core dumps 2877 * (Log as LOG_INFO to appease those who don't want 2878 * these messages.) 2879 * XXX : Todo, as well as euid, write out ruid too 2880 * Note that coredump() drops proc lock. 2881 */ 2882 if (coredump(td) == 0) 2883 sig |= WCOREFLAG; 2884 if (kern_logsigexit) 2885 log(LOG_INFO, 2886 "pid %d (%s), uid %d: exited on signal %d%s\n", 2887 p->p_pid, p->p_comm, 2888 td->td_ucred ? td->td_ucred->cr_uid : -1, 2889 sig &~ WCOREFLAG, 2890 sig & WCOREFLAG ? " (core dumped)" : ""); 2891 } else 2892 PROC_UNLOCK(p); 2893 exit1(td, W_EXITCODE(0, sig)); 2894 /* NOTREACHED */ 2895 } 2896 2897 /* 2898 * Send queued SIGCHLD to parent when child process's state 2899 * is changed. 2900 */ 2901 static void 2902 sigparent(struct proc *p, int reason, int status) 2903 { 2904 PROC_LOCK_ASSERT(p, MA_OWNED); 2905 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED); 2906 2907 if (p->p_ksi != NULL) { 2908 p->p_ksi->ksi_signo = SIGCHLD; 2909 p->p_ksi->ksi_code = reason; 2910 p->p_ksi->ksi_status = status; 2911 p->p_ksi->ksi_pid = p->p_pid; 2912 p->p_ksi->ksi_uid = p->p_ucred->cr_ruid; 2913 if (KSI_ONQ(p->p_ksi)) 2914 return; 2915 } 2916 tdsignal(p->p_pptr, NULL, SIGCHLD, p->p_ksi); 2917 } 2918 2919 static void 2920 childproc_jobstate(struct proc *p, int reason, int status) 2921 { 2922 struct sigacts *ps; 2923 2924 PROC_LOCK_ASSERT(p, MA_OWNED); 2925 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED); 2926 2927 /* 2928 * Wake up parent sleeping in kern_wait(), also send 2929 * SIGCHLD to parent, but SIGCHLD does not guarantee 2930 * that parent will awake, because parent may masked 2931 * the signal. 2932 */ 2933 p->p_pptr->p_flag |= P_STATCHILD; 2934 wakeup(p->p_pptr); 2935 2936 ps = p->p_pptr->p_sigacts; 2937 mtx_lock(&ps->ps_mtx); 2938 if ((ps->ps_flag & PS_NOCLDSTOP) == 0) { 2939 mtx_unlock(&ps->ps_mtx); 2940 sigparent(p, reason, status); 2941 } else 2942 mtx_unlock(&ps->ps_mtx); 2943 } 2944 2945 void 2946 childproc_stopped(struct proc *p, int reason) 2947 { 2948 childproc_jobstate(p, reason, p->p_xstat); 2949 } 2950 2951 void 2952 childproc_continued(struct proc *p) 2953 { 2954 childproc_jobstate(p, CLD_CONTINUED, SIGCONT); 2955 } 2956 2957 void 2958 childproc_exited(struct proc *p) 2959 { 2960 int reason; 2961 int status = p->p_xstat; /* convert to int */ 2962 2963 reason = CLD_EXITED; 2964 if (WCOREDUMP(status)) 2965 reason = CLD_DUMPED; 2966 else if (WIFSIGNALED(status)) 2967 reason = CLD_KILLED; 2968 /* 2969 * XXX avoid calling wakeup(p->p_pptr), the work is 2970 * done in exit1(). 2971 */ 2972 sigparent(p, reason, status); 2973 } 2974 2975 static char corefilename[MAXPATHLEN] = {"%N.core"}; 2976 SYSCTL_STRING(_kern, OID_AUTO, corefile, CTLFLAG_RW, corefilename, 2977 sizeof(corefilename), "process corefile name format string"); 2978 2979 /* 2980 * expand_name(name, uid, pid) 2981 * Expand the name described in corefilename, using name, uid, and pid. 2982 * corefilename is a printf-like string, with three format specifiers: 2983 * %N name of process ("name") 2984 * %P process id (pid) 2985 * %U user id (uid) 2986 * For example, "%N.core" is the default; they can be disabled completely 2987 * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P". 2988 * This is controlled by the sysctl variable kern.corefile (see above). 2989 */ 2990 static char * 2991 expand_name(name, uid, pid) 2992 const char *name; 2993 uid_t uid; 2994 pid_t pid; 2995 { 2996 struct sbuf sb; 2997 const char *format; 2998 char *temp; 2999 size_t i; 3000 3001 format = corefilename; 3002 temp = malloc(MAXPATHLEN, M_TEMP, M_NOWAIT | M_ZERO); 3003 if (temp == NULL) 3004 return (NULL); 3005 (void)sbuf_new(&sb, temp, MAXPATHLEN, SBUF_FIXEDLEN); 3006 for (i = 0; format[i]; i++) { 3007 switch (format[i]) { 3008 case '%': /* Format character */ 3009 i++; 3010 switch (format[i]) { 3011 case '%': 3012 sbuf_putc(&sb, '%'); 3013 break; 3014 case 'N': /* process name */ 3015 sbuf_printf(&sb, "%s", name); 3016 break; 3017 case 'P': /* process id */ 3018 sbuf_printf(&sb, "%u", pid); 3019 break; 3020 case 'U': /* user id */ 3021 sbuf_printf(&sb, "%u", uid); 3022 break; 3023 default: 3024 log(LOG_ERR, 3025 "Unknown format character %c in " 3026 "corename `%s'\n", format[i], format); 3027 } 3028 break; 3029 default: 3030 sbuf_putc(&sb, format[i]); 3031 } 3032 } 3033 if (sbuf_overflowed(&sb)) { 3034 sbuf_delete(&sb); 3035 log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too " 3036 "long\n", (long)pid, name, (u_long)uid); 3037 free(temp, M_TEMP); 3038 return (NULL); 3039 } 3040 sbuf_finish(&sb); 3041 sbuf_delete(&sb); 3042 return (temp); 3043 } 3044 3045 /* 3046 * Dump a process' core. The main routine does some 3047 * policy checking, and creates the name of the coredump; 3048 * then it passes on a vnode and a size limit to the process-specific 3049 * coredump routine if there is one; if there _is not_ one, it returns 3050 * ENOSYS; otherwise it returns the error from the process-specific routine. 3051 */ 3052 3053 static int 3054 coredump(struct thread *td) 3055 { 3056 struct proc *p = td->td_proc; 3057 register struct vnode *vp; 3058 register struct ucred *cred = td->td_ucred; 3059 struct flock lf; 3060 struct nameidata nd; 3061 struct vattr vattr; 3062 int error, error1, flags, locked; 3063 struct mount *mp; 3064 char *name; /* name of corefile */ 3065 off_t limit; 3066 int vfslocked; 3067 3068 PROC_LOCK_ASSERT(p, MA_OWNED); 3069 MPASS((p->p_flag & P_HADTHREADS) == 0 || p->p_singlethread == td); 3070 _STOPEVENT(p, S_CORE, 0); 3071 3072 name = expand_name(p->p_comm, td->td_ucred->cr_uid, p->p_pid); 3073 if (name == NULL) { 3074 PROC_UNLOCK(p); 3075 #ifdef AUDIT 3076 audit_proc_coredump(td, NULL, EINVAL); 3077 #endif 3078 return (EINVAL); 3079 } 3080 if (((sugid_coredump == 0) && p->p_flag & P_SUGID) || do_coredump == 0) { 3081 PROC_UNLOCK(p); 3082 #ifdef AUDIT 3083 audit_proc_coredump(td, name, EFAULT); 3084 #endif 3085 free(name, M_TEMP); 3086 return (EFAULT); 3087 } 3088 3089 /* 3090 * Note that the bulk of limit checking is done after 3091 * the corefile is created. The exception is if the limit 3092 * for corefiles is 0, in which case we don't bother 3093 * creating the corefile at all. This layout means that 3094 * a corefile is truncated instead of not being created, 3095 * if it is larger than the limit. 3096 */ 3097 limit = (off_t)lim_cur(p, RLIMIT_CORE); 3098 PROC_UNLOCK(p); 3099 if (limit == 0) { 3100 #ifdef AUDIT 3101 audit_proc_coredump(td, name, EFBIG); 3102 #endif 3103 free(name, M_TEMP); 3104 return (EFBIG); 3105 } 3106 3107 restart: 3108 NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE, UIO_SYSSPACE, name, td); 3109 flags = O_CREAT | FWRITE | O_NOFOLLOW; 3110 error = vn_open(&nd, &flags, S_IRUSR | S_IWUSR, NULL); 3111 if (error) { 3112 #ifdef AUDIT 3113 audit_proc_coredump(td, name, error); 3114 #endif 3115 free(name, M_TEMP); 3116 return (error); 3117 } 3118 vfslocked = NDHASGIANT(&nd); 3119 NDFREE(&nd, NDF_ONLY_PNBUF); 3120 vp = nd.ni_vp; 3121 3122 /* Don't dump to non-regular files or files with links. */ 3123 if (vp->v_type != VREG || 3124 VOP_GETATTR(vp, &vattr, cred, td) || vattr.va_nlink != 1) { 3125 VOP_UNLOCK(vp, 0, td); 3126 error = EFAULT; 3127 goto close; 3128 } 3129 3130 VOP_UNLOCK(vp, 0, td); 3131 lf.l_whence = SEEK_SET; 3132 lf.l_start = 0; 3133 lf.l_len = 0; 3134 lf.l_type = F_WRLCK; 3135 locked = (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &lf, F_FLOCK) == 0); 3136 3137 if (vn_start_write(vp, &mp, V_NOWAIT) != 0) { 3138 lf.l_type = F_UNLCK; 3139 if (locked) 3140 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK); 3141 if ((error = vn_close(vp, FWRITE, cred, td)) != 0) 3142 goto out; 3143 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3144 goto out; 3145 VFS_UNLOCK_GIANT(vfslocked); 3146 goto restart; 3147 } 3148 3149 VATTR_NULL(&vattr); 3150 vattr.va_size = 0; 3151 if (set_core_nodump_flag) 3152 vattr.va_flags = UF_NODUMP; 3153 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3154 VOP_LEASE(vp, td, cred, LEASE_WRITE); 3155 VOP_SETATTR(vp, &vattr, cred, td); 3156 VOP_UNLOCK(vp, 0, td); 3157 vn_finished_write(mp); 3158 PROC_LOCK(p); 3159 p->p_acflag |= ACORE; 3160 PROC_UNLOCK(p); 3161 3162 error = p->p_sysent->sv_coredump ? 3163 p->p_sysent->sv_coredump(td, vp, limit) : 3164 ENOSYS; 3165 3166 if (locked) { 3167 lf.l_type = F_UNLCK; 3168 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK); 3169 } 3170 close: 3171 error1 = vn_close(vp, FWRITE, cred, td); 3172 if (error == 0) 3173 error = error1; 3174 out: 3175 #ifdef AUDIT 3176 audit_proc_coredump(td, name, error); 3177 #endif 3178 free(name, M_TEMP); 3179 VFS_UNLOCK_GIANT(vfslocked); 3180 return (error); 3181 } 3182 3183 /* 3184 * Nonexistent system call-- signal process (may want to handle it). Flag 3185 * error in case process won't see signal immediately (blocked or ignored). 3186 */ 3187 #ifndef _SYS_SYSPROTO_H_ 3188 struct nosys_args { 3189 int dummy; 3190 }; 3191 #endif 3192 /* ARGSUSED */ 3193 int 3194 nosys(td, args) 3195 struct thread *td; 3196 struct nosys_args *args; 3197 { 3198 struct proc *p = td->td_proc; 3199 3200 PROC_LOCK(p); 3201 psignal(p, SIGSYS); 3202 PROC_UNLOCK(p); 3203 return (ENOSYS); 3204 } 3205 3206 /* 3207 * Send a SIGIO or SIGURG signal to a process or process group using stored 3208 * credentials rather than those of the current process. 3209 */ 3210 void 3211 pgsigio(sigiop, sig, checkctty) 3212 struct sigio **sigiop; 3213 int sig, checkctty; 3214 { 3215 struct sigio *sigio; 3216 3217 SIGIO_LOCK(); 3218 sigio = *sigiop; 3219 if (sigio == NULL) { 3220 SIGIO_UNLOCK(); 3221 return; 3222 } 3223 if (sigio->sio_pgid > 0) { 3224 PROC_LOCK(sigio->sio_proc); 3225 if (CANSIGIO(sigio->sio_ucred, sigio->sio_proc->p_ucred)) 3226 psignal(sigio->sio_proc, sig); 3227 PROC_UNLOCK(sigio->sio_proc); 3228 } else if (sigio->sio_pgid < 0) { 3229 struct proc *p; 3230 3231 PGRP_LOCK(sigio->sio_pgrp); 3232 LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist) { 3233 PROC_LOCK(p); 3234 if (CANSIGIO(sigio->sio_ucred, p->p_ucred) && 3235 (checkctty == 0 || (p->p_flag & P_CONTROLT))) 3236 psignal(p, sig); 3237 PROC_UNLOCK(p); 3238 } 3239 PGRP_UNLOCK(sigio->sio_pgrp); 3240 } 3241 SIGIO_UNLOCK(); 3242 } 3243 3244 static int 3245 filt_sigattach(struct knote *kn) 3246 { 3247 struct proc *p = curproc; 3248 3249 kn->kn_ptr.p_proc = p; 3250 kn->kn_flags |= EV_CLEAR; /* automatically set */ 3251 3252 knlist_add(&p->p_klist, kn, 0); 3253 3254 return (0); 3255 } 3256 3257 static void 3258 filt_sigdetach(struct knote *kn) 3259 { 3260 struct proc *p = kn->kn_ptr.p_proc; 3261 3262 knlist_remove(&p->p_klist, kn, 0); 3263 } 3264 3265 /* 3266 * signal knotes are shared with proc knotes, so we apply a mask to 3267 * the hint in order to differentiate them from process hints. This 3268 * could be avoided by using a signal-specific knote list, but probably 3269 * isn't worth the trouble. 3270 */ 3271 static int 3272 filt_signal(struct knote *kn, long hint) 3273 { 3274 3275 if (hint & NOTE_SIGNAL) { 3276 hint &= ~NOTE_SIGNAL; 3277 3278 if (kn->kn_id == hint) 3279 kn->kn_data++; 3280 } 3281 return (kn->kn_data != 0); 3282 } 3283 3284 struct sigacts * 3285 sigacts_alloc(void) 3286 { 3287 struct sigacts *ps; 3288 3289 ps = malloc(sizeof(struct sigacts), M_SUBPROC, M_WAITOK | M_ZERO); 3290 ps->ps_refcnt = 1; 3291 mtx_init(&ps->ps_mtx, "sigacts", NULL, MTX_DEF); 3292 return (ps); 3293 } 3294 3295 void 3296 sigacts_free(struct sigacts *ps) 3297 { 3298 3299 mtx_lock(&ps->ps_mtx); 3300 ps->ps_refcnt--; 3301 if (ps->ps_refcnt == 0) { 3302 mtx_destroy(&ps->ps_mtx); 3303 free(ps, M_SUBPROC); 3304 } else 3305 mtx_unlock(&ps->ps_mtx); 3306 } 3307 3308 struct sigacts * 3309 sigacts_hold(struct sigacts *ps) 3310 { 3311 mtx_lock(&ps->ps_mtx); 3312 ps->ps_refcnt++; 3313 mtx_unlock(&ps->ps_mtx); 3314 return (ps); 3315 } 3316 3317 void 3318 sigacts_copy(struct sigacts *dest, struct sigacts *src) 3319 { 3320 3321 KASSERT(dest->ps_refcnt == 1, ("sigacts_copy to shared dest")); 3322 mtx_lock(&src->ps_mtx); 3323 bcopy(src, dest, offsetof(struct sigacts, ps_refcnt)); 3324 mtx_unlock(&src->ps_mtx); 3325 } 3326 3327 int 3328 sigacts_shared(struct sigacts *ps) 3329 { 3330 int shared; 3331 3332 mtx_lock(&ps->ps_mtx); 3333 shared = ps->ps_refcnt > 1; 3334 mtx_unlock(&ps->ps_mtx); 3335 return (shared); 3336 }
Cache object: 44e518a8648eccffaf82988ff9cfe0be
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]