The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_signal.c

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    1 /*-
    2  * Copyright (c) 1994-1995 Søren Schmidt
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer 
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/lock.h>
   35 #include <sys/mutex.h>
   36 #include <sys/sx.h>
   37 #include <sys/proc.h>
   38 #include <sys/signalvar.h>
   39 #include <sys/syscallsubr.h>
   40 #include <sys/sysproto.h>
   41 
   42 #include "opt_compat.h"
   43 
   44 #ifdef COMPAT_LINUX32
   45 #include <machine/../linux32/linux.h>
   46 #include <machine/../linux32/linux32_proto.h>
   47 #else
   48 #include <machine/../linux/linux.h>
   49 #include <machine/../linux/linux_proto.h>
   50 #endif
   51 #include <compat/linux/linux_signal.h>
   52 #include <compat/linux/linux_util.h>
   53 #include <compat/linux/linux_emul.h>
   54 
   55 void
   56 linux_to_bsd_sigset(l_sigset_t *lss, sigset_t *bss)
   57 {
   58         int b, l;
   59 
   60         SIGEMPTYSET(*bss);
   61         bss->__bits[0] = lss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
   62         bss->__bits[1] = lss->__bits[1];
   63         for (l = 1; l <= LINUX_SIGTBLSZ; l++) {
   64                 if (LINUX_SIGISMEMBER(*lss, l)) {
   65                         b = linux_to_bsd_signal[_SIG_IDX(l)];
   66                         if (b)
   67                                 SIGADDSET(*bss, b);
   68                 }
   69         }
   70 }
   71 
   72 void
   73 bsd_to_linux_sigset(sigset_t *bss, l_sigset_t *lss)
   74 {
   75         int b, l;
   76 
   77         LINUX_SIGEMPTYSET(*lss);
   78         lss->__bits[0] = bss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
   79         lss->__bits[1] = bss->__bits[1];
   80         for (b = 1; b <= LINUX_SIGTBLSZ; b++) {
   81                 if (SIGISMEMBER(*bss, b)) {
   82                         l = bsd_to_linux_signal[_SIG_IDX(b)];
   83                         if (l)
   84                                 LINUX_SIGADDSET(*lss, l);
   85                 }
   86         }
   87 }
   88 
   89 static void
   90 linux_to_bsd_sigaction(l_sigaction_t *lsa, struct sigaction *bsa)
   91 {
   92 
   93         linux_to_bsd_sigset(&lsa->lsa_mask, &bsa->sa_mask);
   94         bsa->sa_handler = PTRIN(lsa->lsa_handler);
   95         bsa->sa_flags = 0;
   96         if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP)
   97                 bsa->sa_flags |= SA_NOCLDSTOP;
   98         if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT)
   99                 bsa->sa_flags |= SA_NOCLDWAIT;
  100         if (lsa->lsa_flags & LINUX_SA_SIGINFO)
  101                 bsa->sa_flags |= SA_SIGINFO;
  102         if (lsa->lsa_flags & LINUX_SA_ONSTACK)
  103                 bsa->sa_flags |= SA_ONSTACK;
  104         if (lsa->lsa_flags & LINUX_SA_RESTART)
  105                 bsa->sa_flags |= SA_RESTART;
  106         if (lsa->lsa_flags & LINUX_SA_ONESHOT)
  107                 bsa->sa_flags |= SA_RESETHAND;
  108         if (lsa->lsa_flags & LINUX_SA_NOMASK)
  109                 bsa->sa_flags |= SA_NODEFER;
  110 }
  111 
  112 static void
  113 bsd_to_linux_sigaction(struct sigaction *bsa, l_sigaction_t *lsa)
  114 {
  115 
  116         bsd_to_linux_sigset(&bsa->sa_mask, &lsa->lsa_mask);
  117 #ifdef COMPAT_LINUX32
  118         lsa->lsa_handler = (uintptr_t)bsa->sa_handler;
  119 #else
  120         lsa->lsa_handler = bsa->sa_handler;
  121 #endif
  122         lsa->lsa_restorer = 0;          /* unsupported */
  123         lsa->lsa_flags = 0;
  124         if (bsa->sa_flags & SA_NOCLDSTOP)
  125                 lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
  126         if (bsa->sa_flags & SA_NOCLDWAIT)
  127                 lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
  128         if (bsa->sa_flags & SA_SIGINFO)
  129                 lsa->lsa_flags |= LINUX_SA_SIGINFO;
  130         if (bsa->sa_flags & SA_ONSTACK)
  131                 lsa->lsa_flags |= LINUX_SA_ONSTACK;
  132         if (bsa->sa_flags & SA_RESTART)
  133                 lsa->lsa_flags |= LINUX_SA_RESTART;
  134         if (bsa->sa_flags & SA_RESETHAND)
  135                 lsa->lsa_flags |= LINUX_SA_ONESHOT;
  136         if (bsa->sa_flags & SA_NODEFER)
  137                 lsa->lsa_flags |= LINUX_SA_NOMASK;
  138 }
  139 
  140 int
  141 linux_do_sigaction(struct thread *td, int linux_sig, l_sigaction_t *linux_nsa,
  142                    l_sigaction_t *linux_osa)
  143 {
  144         struct sigaction act, oact, *nsa, *osa;
  145         int error, sig;
  146 
  147         if (!LINUX_SIG_VALID(linux_sig))
  148                 return (EINVAL);
  149 
  150         osa = (linux_osa != NULL) ? &oact : NULL;
  151         if (linux_nsa != NULL) {
  152                 nsa = &act;
  153                 linux_to_bsd_sigaction(linux_nsa, nsa);
  154         } else
  155                 nsa = NULL;
  156 
  157         if (linux_sig <= LINUX_SIGTBLSZ)
  158                 sig = linux_to_bsd_signal[_SIG_IDX(linux_sig)];
  159         else
  160                 sig = linux_sig;
  161 
  162         error = kern_sigaction(td, sig, nsa, osa, 0);
  163         if (error)
  164                 return (error);
  165 
  166         if (linux_osa != NULL)
  167                 bsd_to_linux_sigaction(osa, linux_osa);
  168 
  169         return (0);
  170 }
  171 
  172 
  173 int
  174 linux_signal(struct thread *td, struct linux_signal_args *args)
  175 {
  176         l_sigaction_t nsa, osa;
  177         int error;
  178 
  179 #ifdef DEBUG
  180         if (ldebug(signal))
  181                 printf(ARGS(signal, "%d, %p"),
  182                     args->sig, (void *)(uintptr_t)args->handler);
  183 #endif
  184 
  185         nsa.lsa_handler = args->handler;
  186         nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
  187         LINUX_SIGEMPTYSET(nsa.lsa_mask);
  188 
  189         error = linux_do_sigaction(td, args->sig, &nsa, &osa);
  190         td->td_retval[0] = (int)(intptr_t)osa.lsa_handler;
  191 
  192         return (error);
  193 }
  194 
  195 int
  196 linux_rt_sigaction(struct thread *td, struct linux_rt_sigaction_args *args)
  197 {
  198         l_sigaction_t nsa, osa;
  199         int error;
  200 
  201 #ifdef DEBUG
  202         if (ldebug(rt_sigaction))
  203                 printf(ARGS(rt_sigaction, "%ld, %p, %p, %ld"),
  204                     (long)args->sig, (void *)args->act,
  205                     (void *)args->oact, (long)args->sigsetsize);
  206 #endif
  207 
  208         if (args->sigsetsize != sizeof(l_sigset_t))
  209                 return (EINVAL);
  210 
  211         if (args->act != NULL) {
  212                 error = copyin(args->act, &nsa, sizeof(l_sigaction_t));
  213                 if (error)
  214                         return (error);
  215         }
  216 
  217         error = linux_do_sigaction(td, args->sig,
  218                                    args->act ? &nsa : NULL,
  219                                    args->oact ? &osa : NULL);
  220 
  221         if (args->oact != NULL && !error) {
  222                 error = copyout(&osa, args->oact, sizeof(l_sigaction_t));
  223         }
  224 
  225         return (error);
  226 }
  227 
  228 static int
  229 linux_do_sigprocmask(struct thread *td, int how, l_sigset_t *new,
  230                      l_sigset_t *old)
  231 {
  232         sigset_t omask, nmask;
  233         sigset_t *nmaskp;
  234         int error;
  235 
  236         td->td_retval[0] = 0;
  237 
  238         switch (how) {
  239         case LINUX_SIG_BLOCK:
  240                 how = SIG_BLOCK;
  241                 break;
  242         case LINUX_SIG_UNBLOCK:
  243                 how = SIG_UNBLOCK;
  244                 break;
  245         case LINUX_SIG_SETMASK:
  246                 how = SIG_SETMASK;
  247                 break;
  248         default:
  249                 return (EINVAL);
  250         }
  251         if (new != NULL) {
  252                 linux_to_bsd_sigset(new, &nmask);
  253                 nmaskp = &nmask;
  254         } else
  255                 nmaskp = NULL;
  256         error = kern_sigprocmask(td, how, nmaskp, &omask, 0);
  257         if (error == 0 && old != NULL)
  258                 bsd_to_linux_sigset(&omask, old);
  259 
  260         return (error);
  261 }
  262 
  263 int
  264 linux_sigprocmask(struct thread *td, struct linux_sigprocmask_args *args)
  265 {
  266         l_osigset_t mask;
  267         l_sigset_t set, oset;
  268         int error;
  269 
  270 #ifdef DEBUG
  271         if (ldebug(sigprocmask))
  272                 printf(ARGS(sigprocmask, "%d, *, *"), args->how);
  273 #endif
  274 
  275         if (args->mask != NULL) {
  276                 error = copyin(args->mask, &mask, sizeof(l_osigset_t));
  277                 if (error)
  278                         return (error);
  279                 LINUX_SIGEMPTYSET(set);
  280                 set.__bits[0] = mask;
  281         }
  282 
  283         error = linux_do_sigprocmask(td, args->how,
  284                                      args->mask ? &set : NULL,
  285                                      args->omask ? &oset : NULL);
  286 
  287         if (args->omask != NULL && !error) {
  288                 mask = oset.__bits[0];
  289                 error = copyout(&mask, args->omask, sizeof(l_osigset_t));
  290         }
  291 
  292         return (error);
  293 }
  294 
  295 int
  296 linux_rt_sigprocmask(struct thread *td, struct linux_rt_sigprocmask_args *args)
  297 {
  298         l_sigset_t set, oset;
  299         int error;
  300 
  301 #ifdef DEBUG
  302         if (ldebug(rt_sigprocmask))
  303                 printf(ARGS(rt_sigprocmask, "%d, %p, %p, %ld"),
  304                     args->how, (void *)args->mask,
  305                     (void *)args->omask, (long)args->sigsetsize);
  306 #endif
  307 
  308         if (args->sigsetsize != sizeof(l_sigset_t))
  309                 return EINVAL;
  310 
  311         if (args->mask != NULL) {
  312                 error = copyin(args->mask, &set, sizeof(l_sigset_t));
  313                 if (error)
  314                         return (error);
  315         }
  316 
  317         error = linux_do_sigprocmask(td, args->how,
  318                                      args->mask ? &set : NULL,
  319                                      args->omask ? &oset : NULL);
  320 
  321         if (args->omask != NULL && !error) {
  322                 error = copyout(&oset, args->omask, sizeof(l_sigset_t));
  323         }
  324 
  325         return (error);
  326 }
  327 
  328 int
  329 linux_sgetmask(struct thread *td, struct linux_sgetmask_args *args)
  330 {
  331         struct proc *p = td->td_proc;
  332         l_sigset_t mask;
  333 
  334 #ifdef DEBUG
  335         if (ldebug(sgetmask))
  336                 printf(ARGS(sgetmask, ""));
  337 #endif
  338 
  339         PROC_LOCK(p);
  340         bsd_to_linux_sigset(&td->td_sigmask, &mask);
  341         PROC_UNLOCK(p);
  342         td->td_retval[0] = mask.__bits[0];
  343         return (0);
  344 }
  345 
  346 int
  347 linux_ssetmask(struct thread *td, struct linux_ssetmask_args *args)
  348 {
  349         struct proc *p = td->td_proc;
  350         l_sigset_t lset;
  351         sigset_t bset;
  352 
  353 #ifdef DEBUG
  354         if (ldebug(ssetmask))
  355                 printf(ARGS(ssetmask, "%08lx"), (unsigned long)args->mask);
  356 #endif
  357 
  358         PROC_LOCK(p);
  359         bsd_to_linux_sigset(&td->td_sigmask, &lset);
  360         td->td_retval[0] = lset.__bits[0];
  361         LINUX_SIGEMPTYSET(lset);
  362         lset.__bits[0] = args->mask;
  363         linux_to_bsd_sigset(&lset, &bset);
  364         td->td_sigmask = bset;
  365         SIG_CANTMASK(td->td_sigmask);
  366         signotify(td);
  367         PROC_UNLOCK(p);
  368         return (0);
  369 }
  370 
  371 /*
  372  * MPSAFE
  373  */
  374 int
  375 linux_sigpending(struct thread *td, struct linux_sigpending_args *args)
  376 {
  377         struct proc *p = td->td_proc;
  378         sigset_t bset;
  379         l_sigset_t lset;
  380         l_osigset_t mask;
  381 
  382 #ifdef DEBUG
  383         if (ldebug(sigpending))
  384                 printf(ARGS(sigpending, "*"));
  385 #endif
  386 
  387         PROC_LOCK(p);
  388         bset = p->p_siglist;
  389         SIGSETOR(bset, td->td_siglist);
  390         SIGSETAND(bset, td->td_sigmask);
  391         PROC_UNLOCK(p);
  392         bsd_to_linux_sigset(&bset, &lset);
  393         mask = lset.__bits[0];
  394         return (copyout(&mask, args->mask, sizeof(mask)));
  395 }
  396 
  397 /*
  398  * MPSAFE
  399  */
  400 int
  401 linux_rt_sigpending(struct thread *td, struct linux_rt_sigpending_args *args)
  402 {
  403         struct proc *p = td->td_proc;
  404         sigset_t bset;
  405         l_sigset_t lset;
  406 
  407         if (args->sigsetsize > sizeof(lset))
  408                 return EINVAL;
  409                 /* NOT REACHED */
  410 
  411 #ifdef DEBUG
  412         if (ldebug(rt_sigpending))
  413                 printf(ARGS(rt_sigpending, "*"));
  414 #endif
  415 
  416         PROC_LOCK(p);
  417         bset = p->p_siglist;
  418         SIGSETOR(bset, td->td_siglist);
  419         SIGSETAND(bset, td->td_sigmask);
  420         PROC_UNLOCK(p);
  421         bsd_to_linux_sigset(&bset, &lset);
  422         return (copyout(&lset, args->set, args->sigsetsize));
  423 }
  424 
  425 /*
  426  * MPSAFE
  427  */
  428 int
  429 linux_rt_sigtimedwait(struct thread *td,
  430         struct linux_rt_sigtimedwait_args *args)
  431 {
  432         int error;
  433         l_timeval ltv;
  434         struct timeval tv;
  435         struct timespec ts, *tsa;
  436         l_sigset_t lset;
  437         sigset_t bset;
  438         l_siginfo_t linfo;
  439         ksiginfo_t info;
  440 
  441 #ifdef DEBUG
  442         if (ldebug(rt_sigtimedwait))
  443                 printf(ARGS(rt_sigtimedwait, "*"));
  444 #endif
  445         if (args->sigsetsize != sizeof(l_sigset_t))
  446                 return (EINVAL);
  447 
  448         if ((error = copyin(args->mask, &lset, sizeof(lset))))
  449                 return (error);
  450         linux_to_bsd_sigset(&lset, &bset);
  451 
  452         tsa = NULL;
  453         if (args->timeout) {
  454                 if ((error = copyin(args->timeout, &ltv, sizeof(ltv))))
  455                         return (error);
  456 #ifdef DEBUG
  457                 if (ldebug(rt_sigtimedwait))
  458                         printf(LMSG("linux_rt_sigtimedwait: incoming timeout (%d/%d)\n"),
  459                                 ltv.tv_sec, ltv.tv_usec);
  460 #endif
  461                 tv.tv_sec = (long)ltv.tv_sec;
  462                 tv.tv_usec = (suseconds_t)ltv.tv_usec;
  463                 if (itimerfix(&tv)) {
  464                         /* 
  465                          * The timeout was invalid. Convert it to something
  466                          * valid that will act as it does under Linux.
  467                          */
  468                         tv.tv_sec += tv.tv_usec / 1000000;
  469                         tv.tv_usec %= 1000000;
  470                         if (tv.tv_usec < 0) {
  471                                 tv.tv_sec -= 1;
  472                                 tv.tv_usec += 1000000;
  473                         }
  474                         if (tv.tv_sec < 0)
  475                                 timevalclear(&tv);
  476 #ifdef DEBUG
  477                         if (ldebug(rt_sigtimedwait))
  478                                 printf(LMSG("linux_rt_sigtimedwait: converted timeout (%jd/%ld)\n"),
  479                                         (intmax_t)tv.tv_sec, tv.tv_usec);
  480 #endif
  481                 }
  482                 TIMEVAL_TO_TIMESPEC(&tv, &ts);
  483                 tsa = &ts;
  484         }
  485         error = kern_sigtimedwait(td, bset, &info, tsa);
  486 #ifdef DEBUG
  487         if (ldebug(rt_sigtimedwait))
  488                 printf(LMSG("linux_rt_sigtimedwait: sigtimedwait returning (%d)\n"), error);
  489 #endif
  490         if (error)
  491                 return (error);
  492 
  493         if (args->ptr) {
  494                 memset(&linfo, 0, sizeof(linfo));
  495                 linfo.lsi_signo = info.ksi_signo;
  496                 error = copyout(&linfo, args->ptr, sizeof(linfo));
  497         }
  498 
  499         /* Repost if we got an error. */
  500         if (error && info.ksi_signo) {
  501                 PROC_LOCK(td->td_proc);
  502                 tdsignal(td->td_proc, td, info.ksi_signo, &info);
  503                 PROC_UNLOCK(td->td_proc);
  504         } else
  505                 td->td_retval[0] = info.ksi_signo; 
  506 
  507         return (error);
  508 }
  509 
  510 int
  511 linux_kill(struct thread *td, struct linux_kill_args *args)
  512 {
  513         struct kill_args /* {
  514             int pid;
  515             int signum;
  516         } */ tmp;
  517 
  518 #ifdef DEBUG
  519         if (ldebug(kill))
  520                 printf(ARGS(kill, "%d, %d"), args->pid, args->signum);
  521 #endif
  522 
  523         /*
  524          * Allow signal 0 as a means to check for privileges
  525          */
  526         if (!LINUX_SIG_VALID(args->signum) && args->signum != 0)
  527                 return EINVAL;
  528 
  529         if (args->signum > 0 && args->signum <= LINUX_SIGTBLSZ)
  530                 tmp.signum = linux_to_bsd_signal[_SIG_IDX(args->signum)];
  531         else
  532                 tmp.signum = args->signum;
  533 
  534         tmp.pid = args->pid;
  535         return (kill(td, &tmp));
  536 }
  537 
  538 int
  539 linux_tgkill(struct thread *td, struct linux_tgkill_args *args)
  540 {
  541         struct linux_emuldata *em;
  542         struct linux_kill_args ka;
  543         struct proc *p;
  544 
  545 #ifdef DEBUG
  546         if (ldebug(tgkill))
  547                 printf(ARGS(tgkill, "%d, %d, %d"), args->tgid, args->pid, args->sig);
  548 #endif
  549 
  550         ka.pid = args->pid;
  551         ka.signum = args->sig;
  552 
  553         if (args->tgid == -1)
  554                 return linux_kill(td, &ka);
  555 
  556         if ((p = pfind(args->pid)) == NULL)
  557                 return ESRCH;
  558 
  559         if (p->p_sysent != &elf_linux_sysvec)
  560                 return ESRCH;
  561 
  562         PROC_UNLOCK(p);
  563 
  564         em = em_find(p, EMUL_DONTLOCK);
  565 
  566         if (em == NULL) {
  567 #ifdef DEBUG
  568                 printf("emuldata not found in tgkill.\n");
  569 #endif
  570                 return ESRCH;
  571         }
  572 
  573         if (em->shared->group_pid != args->tgid)
  574                 return ESRCH;
  575 
  576         return linux_kill(td, &ka);
  577 }
  578 
  579 int
  580 linux_tkill(struct thread *td, struct linux_tkill_args *args)
  581 {
  582 #ifdef DEBUG
  583         if (ldebug(tkill))
  584                 printf(ARGS(tkill, "%i, %i"), args->tid, args->sig);
  585 #endif
  586 
  587         return (linux_kill(td, (struct linux_kill_args *) args));
  588 }

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