FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_proc.c
1 /*-
2 * Copyright (c) 1982, 1986, 1989, 1991, 1993
3 * The Regents of the University of California. 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 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)kern_proc.c 8.7 (Berkeley) 2/14/95
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 #include "opt_compat.h"
36 #include "opt_ddb.h"
37 #include "opt_kdtrace.h"
38 #include "opt_ktrace.h"
39 #include "opt_kstack_pages.h"
40 #include "opt_stack.h"
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/lock.h>
46 #include <sys/malloc.h>
47 #include <sys/mount.h>
48 #include <sys/mutex.h>
49 #include <sys/proc.h>
50 #include <sys/refcount.h>
51 #include <sys/sbuf.h>
52 #include <sys/sysent.h>
53 #include <sys/sched.h>
54 #include <sys/smp.h>
55 #include <sys/stack.h>
56 #include <sys/sysctl.h>
57 #include <sys/filedesc.h>
58 #include <sys/tty.h>
59 #include <sys/sdt.h>
60 #include <sys/signalvar.h>
61 #include <sys/sx.h>
62 #include <sys/user.h>
63 #include <sys/jail.h>
64 #include <sys/vnode.h>
65 #include <sys/eventhandler.h>
66 #ifdef KTRACE
67 #include <sys/uio.h>
68 #include <sys/ktrace.h>
69 #endif
70
71 #ifdef DDB
72 #include <ddb/ddb.h>
73 #endif
74
75 #include <vm/vm.h>
76 #include <vm/vm_extern.h>
77 #include <vm/pmap.h>
78 #include <vm/vm_map.h>
79 #include <vm/vm_object.h>
80 #include <vm/uma.h>
81
82 SDT_PROVIDER_DEFINE(proc);
83 SDT_PROBE_DEFINE(proc, kernel, ctor, entry);
84 SDT_PROBE_ARGTYPE(proc, kernel, ctor, entry, 0, "struct proc *");
85 SDT_PROBE_ARGTYPE(proc, kernel, ctor, entry, 1, "int");
86 SDT_PROBE_ARGTYPE(proc, kernel, ctor, entry, 2, "void *");
87 SDT_PROBE_ARGTYPE(proc, kernel, ctor, entry, 3, "int");
88 SDT_PROBE_DEFINE(proc, kernel, ctor, return);
89 SDT_PROBE_ARGTYPE(proc, kernel, ctor, return, 0, "struct proc *");
90 SDT_PROBE_ARGTYPE(proc, kernel, ctor, return, 1, "int");
91 SDT_PROBE_ARGTYPE(proc, kernel, ctor, return, 2, "void *");
92 SDT_PROBE_ARGTYPE(proc, kernel, ctor, return, 3, "int");
93 SDT_PROBE_DEFINE(proc, kernel, dtor, entry);
94 SDT_PROBE_ARGTYPE(proc, kernel, dtor, entry, 0, "struct proc *");
95 SDT_PROBE_ARGTYPE(proc, kernel, dtor, entry, 1, "int");
96 SDT_PROBE_ARGTYPE(proc, kernel, dtor, entry, 2, "void *");
97 SDT_PROBE_ARGTYPE(proc, kernel, dtor, entry, 3, "struct thread *");
98 SDT_PROBE_DEFINE(proc, kernel, dtor, return);
99 SDT_PROBE_ARGTYPE(proc, kernel, dtor, return, 0, "struct proc *");
100 SDT_PROBE_ARGTYPE(proc, kernel, dtor, return, 1, "int");
101 SDT_PROBE_ARGTYPE(proc, kernel, dtor, return, 2, "void *");
102 SDT_PROBE_DEFINE(proc, kernel, init, entry);
103 SDT_PROBE_ARGTYPE(proc, kernel, init, entry, 0, "struct proc *");
104 SDT_PROBE_ARGTYPE(proc, kernel, init, entry, 1, "int");
105 SDT_PROBE_ARGTYPE(proc, kernel, init, entry, 2, "int");
106 SDT_PROBE_DEFINE(proc, kernel, init, return);
107 SDT_PROBE_ARGTYPE(proc, kernel, init, return, 0, "struct proc *");
108 SDT_PROBE_ARGTYPE(proc, kernel, init, return, 1, "int");
109 SDT_PROBE_ARGTYPE(proc, kernel, init, return, 2, "int");
110
111 MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
112 MALLOC_DEFINE(M_SESSION, "session", "session header");
113 static MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
114 MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
115
116 static void doenterpgrp(struct proc *, struct pgrp *);
117 static void orphanpg(struct pgrp *pg);
118 static void fill_kinfo_proc_only(struct proc *p, struct kinfo_proc *kp);
119 static void fill_kinfo_thread(struct thread *td, struct kinfo_proc *kp,
120 int preferthread);
121 static void pgadjustjobc(struct pgrp *pgrp, int entering);
122 static void pgdelete(struct pgrp *);
123 static int proc_ctor(void *mem, int size, void *arg, int flags);
124 static void proc_dtor(void *mem, int size, void *arg);
125 static int proc_init(void *mem, int size, int flags);
126 static void proc_fini(void *mem, int size);
127 static void pargs_free(struct pargs *pa);
128
129 /*
130 * Other process lists
131 */
132 struct pidhashhead *pidhashtbl;
133 u_long pidhash;
134 struct pgrphashhead *pgrphashtbl;
135 u_long pgrphash;
136 struct proclist allproc;
137 struct proclist zombproc;
138 struct sx allproc_lock;
139 struct sx proctree_lock;
140 struct mtx ppeers_lock;
141 uma_zone_t proc_zone;
142 uma_zone_t ithread_zone;
143
144 int kstack_pages = KSTACK_PAGES;
145 SYSCTL_INT(_kern, OID_AUTO, kstack_pages, CTLFLAG_RD, &kstack_pages, 0, "");
146
147 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
148
149 /*
150 * Initialize global process hashing structures.
151 */
152 void
153 procinit()
154 {
155
156 sx_init(&allproc_lock, "allproc");
157 sx_init(&proctree_lock, "proctree");
158 mtx_init(&ppeers_lock, "p_peers", NULL, MTX_DEF);
159 LIST_INIT(&allproc);
160 LIST_INIT(&zombproc);
161 pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
162 pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
163 proc_zone = uma_zcreate("PROC", sched_sizeof_proc(),
164 proc_ctor, proc_dtor, proc_init, proc_fini,
165 UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
166 uihashinit();
167 }
168
169 /*
170 * Prepare a proc for use.
171 */
172 static int
173 proc_ctor(void *mem, int size, void *arg, int flags)
174 {
175 struct proc *p;
176
177 p = (struct proc *)mem;
178 SDT_PROBE(proc, kernel, ctor, entry, p, size, arg, flags, 0);
179 EVENTHANDLER_INVOKE(process_ctor, p);
180 SDT_PROBE(proc, kernel, ctor, return, p, size, arg, flags, 0);
181 return (0);
182 }
183
184 /*
185 * Reclaim a proc after use.
186 */
187 static void
188 proc_dtor(void *mem, int size, void *arg)
189 {
190 struct proc *p;
191 struct thread *td;
192
193 /* INVARIANTS checks go here */
194 p = (struct proc *)mem;
195 td = FIRST_THREAD_IN_PROC(p);
196 SDT_PROBE(proc, kernel, dtor, entry, p, size, arg, td, 0);
197 if (td != NULL) {
198 #ifdef INVARIANTS
199 KASSERT((p->p_numthreads == 1),
200 ("bad number of threads in exiting process"));
201 KASSERT(STAILQ_EMPTY(&p->p_ktr), ("proc_dtor: non-empty p_ktr"));
202 #endif
203
204 /* Dispose of an alternate kstack, if it exists.
205 * XXX What if there are more than one thread in the proc?
206 * The first thread in the proc is special and not
207 * freed, so you gotta do this here.
208 */
209 if (((p->p_flag & P_KTHREAD) != 0) && (td->td_altkstack != 0))
210 vm_thread_dispose_altkstack(td);
211 }
212 EVENTHANDLER_INVOKE(process_dtor, p);
213 if (p->p_ksi != NULL)
214 KASSERT(! KSI_ONQ(p->p_ksi), ("SIGCHLD queue"));
215 SDT_PROBE(proc, kernel, dtor, return, p, size, arg, 0, 0);
216 }
217
218 /*
219 * Initialize type-stable parts of a proc (when newly created).
220 */
221 static int
222 proc_init(void *mem, int size, int flags)
223 {
224 struct proc *p;
225
226 p = (struct proc *)mem;
227 SDT_PROBE(proc, kernel, init, entry, p, size, flags, 0, 0);
228 p->p_sched = (struct p_sched *)&p[1];
229 bzero(&p->p_mtx, sizeof(struct mtx));
230 mtx_init(&p->p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK);
231 mtx_init(&p->p_slock, "process slock", NULL, MTX_SPIN | MTX_RECURSE);
232 TAILQ_INIT(&p->p_threads); /* all threads in proc */
233 EVENTHANDLER_INVOKE(process_init, p);
234 p->p_stats = pstats_alloc();
235 SDT_PROBE(proc, kernel, init, return, p, size, flags, 0, 0);
236 return (0);
237 }
238
239 /*
240 * UMA should ensure that this function is never called.
241 * Freeing a proc structure would violate type stability.
242 */
243 static void
244 proc_fini(void *mem, int size)
245 {
246 #ifdef notnow
247 struct proc *p;
248
249 p = (struct proc *)mem;
250 EVENTHANDLER_INVOKE(process_fini, p);
251 pstats_free(p->p_stats);
252 thread_free(FIRST_THREAD_IN_PROC(p));
253 mtx_destroy(&p->p_mtx);
254 if (p->p_ksi != NULL)
255 ksiginfo_free(p->p_ksi);
256 #else
257 panic("proc reclaimed");
258 #endif
259 }
260
261 /*
262 * Is p an inferior of the current process?
263 */
264 int
265 inferior(p)
266 register struct proc *p;
267 {
268
269 sx_assert(&proctree_lock, SX_LOCKED);
270 for (; p != curproc; p = p->p_pptr)
271 if (p->p_pid == 0)
272 return (0);
273 return (1);
274 }
275
276 /*
277 * Locate a process by number; return only "live" processes -- i.e., neither
278 * zombies nor newly born but incompletely initialized processes. By not
279 * returning processes in the PRS_NEW state, we allow callers to avoid
280 * testing for that condition to avoid dereferencing p_ucred, et al.
281 */
282 struct proc *
283 pfind(pid)
284 register pid_t pid;
285 {
286 register struct proc *p;
287
288 sx_slock(&allproc_lock);
289 LIST_FOREACH(p, PIDHASH(pid), p_hash)
290 if (p->p_pid == pid) {
291 if (p->p_state == PRS_NEW) {
292 p = NULL;
293 break;
294 }
295 PROC_LOCK(p);
296 break;
297 }
298 sx_sunlock(&allproc_lock);
299 return (p);
300 }
301
302 /*
303 * Locate a process group by number.
304 * The caller must hold proctree_lock.
305 */
306 struct pgrp *
307 pgfind(pgid)
308 register pid_t pgid;
309 {
310 register struct pgrp *pgrp;
311
312 sx_assert(&proctree_lock, SX_LOCKED);
313
314 LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash) {
315 if (pgrp->pg_id == pgid) {
316 PGRP_LOCK(pgrp);
317 return (pgrp);
318 }
319 }
320 return (NULL);
321 }
322
323 /*
324 * Create a new process group.
325 * pgid must be equal to the pid of p.
326 * Begin a new session if required.
327 */
328 int
329 enterpgrp(p, pgid, pgrp, sess)
330 register struct proc *p;
331 pid_t pgid;
332 struct pgrp *pgrp;
333 struct session *sess;
334 {
335 struct pgrp *pgrp2;
336
337 sx_assert(&proctree_lock, SX_XLOCKED);
338
339 KASSERT(pgrp != NULL, ("enterpgrp: pgrp == NULL"));
340 KASSERT(p->p_pid == pgid,
341 ("enterpgrp: new pgrp and pid != pgid"));
342
343 pgrp2 = pgfind(pgid);
344
345 KASSERT(pgrp2 == NULL,
346 ("enterpgrp: pgrp with pgid exists"));
347 KASSERT(!SESS_LEADER(p),
348 ("enterpgrp: session leader attempted setpgrp"));
349
350 mtx_init(&pgrp->pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
351
352 if (sess != NULL) {
353 /*
354 * new session
355 */
356 mtx_init(&sess->s_mtx, "session", NULL, MTX_DEF);
357 mtx_lock(&Giant); /* XXX TTY */
358 PROC_LOCK(p);
359 p->p_flag &= ~P_CONTROLT;
360 PROC_UNLOCK(p);
361 PGRP_LOCK(pgrp);
362 sess->s_leader = p;
363 sess->s_sid = p->p_pid;
364 sess->s_count = 1;
365 sess->s_ttyvp = NULL;
366 sess->s_ttyp = NULL;
367 bcopy(p->p_session->s_login, sess->s_login,
368 sizeof(sess->s_login));
369 pgrp->pg_session = sess;
370 KASSERT(p == curproc,
371 ("enterpgrp: mksession and p != curproc"));
372 } else {
373 mtx_lock(&Giant); /* XXX TTY */
374 pgrp->pg_session = p->p_session;
375 SESS_LOCK(pgrp->pg_session);
376 pgrp->pg_session->s_count++;
377 SESS_UNLOCK(pgrp->pg_session);
378 PGRP_LOCK(pgrp);
379 }
380 pgrp->pg_id = pgid;
381 LIST_INIT(&pgrp->pg_members);
382
383 /*
384 * As we have an exclusive lock of proctree_lock,
385 * this should not deadlock.
386 */
387 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
388 pgrp->pg_jobc = 0;
389 SLIST_INIT(&pgrp->pg_sigiolst);
390 PGRP_UNLOCK(pgrp);
391 mtx_unlock(&Giant); /* XXX TTY */
392
393 doenterpgrp(p, pgrp);
394
395 return (0);
396 }
397
398 /*
399 * Move p to an existing process group
400 */
401 int
402 enterthispgrp(p, pgrp)
403 register struct proc *p;
404 struct pgrp *pgrp;
405 {
406
407 sx_assert(&proctree_lock, SX_XLOCKED);
408 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
409 PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
410 PGRP_LOCK_ASSERT(p->p_pgrp, MA_NOTOWNED);
411 SESS_LOCK_ASSERT(p->p_session, MA_NOTOWNED);
412 KASSERT(pgrp->pg_session == p->p_session,
413 ("%s: pgrp's session %p, p->p_session %p.\n",
414 __func__,
415 pgrp->pg_session,
416 p->p_session));
417 KASSERT(pgrp != p->p_pgrp,
418 ("%s: p belongs to pgrp.", __func__));
419
420 doenterpgrp(p, pgrp);
421
422 return (0);
423 }
424
425 /*
426 * Move p to a process group
427 */
428 static void
429 doenterpgrp(p, pgrp)
430 struct proc *p;
431 struct pgrp *pgrp;
432 {
433 struct pgrp *savepgrp;
434
435 sx_assert(&proctree_lock, SX_XLOCKED);
436 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
437 PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
438 PGRP_LOCK_ASSERT(p->p_pgrp, MA_NOTOWNED);
439 SESS_LOCK_ASSERT(p->p_session, MA_NOTOWNED);
440
441 savepgrp = p->p_pgrp;
442
443 /*
444 * Adjust eligibility of affected pgrps to participate in job control.
445 * Increment eligibility counts before decrementing, otherwise we
446 * could reach 0 spuriously during the first call.
447 */
448 fixjobc(p, pgrp, 1);
449 fixjobc(p, p->p_pgrp, 0);
450
451 mtx_lock(&Giant); /* XXX TTY */
452 PGRP_LOCK(pgrp);
453 PGRP_LOCK(savepgrp);
454 PROC_LOCK(p);
455 LIST_REMOVE(p, p_pglist);
456 p->p_pgrp = pgrp;
457 PROC_UNLOCK(p);
458 LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
459 PGRP_UNLOCK(savepgrp);
460 PGRP_UNLOCK(pgrp);
461 mtx_unlock(&Giant); /* XXX TTY */
462 if (LIST_EMPTY(&savepgrp->pg_members))
463 pgdelete(savepgrp);
464 }
465
466 /*
467 * remove process from process group
468 */
469 int
470 leavepgrp(p)
471 register struct proc *p;
472 {
473 struct pgrp *savepgrp;
474
475 sx_assert(&proctree_lock, SX_XLOCKED);
476 savepgrp = p->p_pgrp;
477 mtx_lock(&Giant); /* XXX TTY */
478 PGRP_LOCK(savepgrp);
479 PROC_LOCK(p);
480 LIST_REMOVE(p, p_pglist);
481 p->p_pgrp = NULL;
482 PROC_UNLOCK(p);
483 PGRP_UNLOCK(savepgrp);
484 mtx_unlock(&Giant); /* XXX TTY */
485 if (LIST_EMPTY(&savepgrp->pg_members))
486 pgdelete(savepgrp);
487 return (0);
488 }
489
490 /*
491 * delete a process group
492 */
493 static void
494 pgdelete(pgrp)
495 register struct pgrp *pgrp;
496 {
497 struct session *savesess;
498
499 sx_assert(&proctree_lock, SX_XLOCKED);
500 PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
501 SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED);
502
503 /*
504 * Reset any sigio structures pointing to us as a result of
505 * F_SETOWN with our pgid.
506 */
507 funsetownlst(&pgrp->pg_sigiolst);
508
509 mtx_lock(&Giant); /* XXX TTY */
510 PGRP_LOCK(pgrp);
511 if (pgrp->pg_session->s_ttyp != NULL &&
512 pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
513 pgrp->pg_session->s_ttyp->t_pgrp = NULL;
514 LIST_REMOVE(pgrp, pg_hash);
515 savesess = pgrp->pg_session;
516 SESSRELE(savesess);
517 PGRP_UNLOCK(pgrp);
518 mtx_destroy(&pgrp->pg_mtx);
519 FREE(pgrp, M_PGRP);
520 mtx_unlock(&Giant); /* XXX TTY */
521 }
522
523 static void
524 pgadjustjobc(pgrp, entering)
525 struct pgrp *pgrp;
526 int entering;
527 {
528
529 PGRP_LOCK(pgrp);
530 if (entering)
531 pgrp->pg_jobc++;
532 else {
533 --pgrp->pg_jobc;
534 if (pgrp->pg_jobc == 0)
535 orphanpg(pgrp);
536 }
537 PGRP_UNLOCK(pgrp);
538 }
539
540 /*
541 * Adjust pgrp jobc counters when specified process changes process group.
542 * We count the number of processes in each process group that "qualify"
543 * the group for terminal job control (those with a parent in a different
544 * process group of the same session). If that count reaches zero, the
545 * process group becomes orphaned. Check both the specified process'
546 * process group and that of its children.
547 * entering == 0 => p is leaving specified group.
548 * entering == 1 => p is entering specified group.
549 */
550 void
551 fixjobc(p, pgrp, entering)
552 register struct proc *p;
553 register struct pgrp *pgrp;
554 int entering;
555 {
556 register struct pgrp *hispgrp;
557 register struct session *mysession;
558
559 sx_assert(&proctree_lock, SX_LOCKED);
560 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
561 PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
562 SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED);
563
564 /*
565 * Check p's parent to see whether p qualifies its own process
566 * group; if so, adjust count for p's process group.
567 */
568 mysession = pgrp->pg_session;
569 if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
570 hispgrp->pg_session == mysession)
571 pgadjustjobc(pgrp, entering);
572
573 /*
574 * Check this process' children to see whether they qualify
575 * their process groups; if so, adjust counts for children's
576 * process groups.
577 */
578 LIST_FOREACH(p, &p->p_children, p_sibling) {
579 hispgrp = p->p_pgrp;
580 if (hispgrp == pgrp ||
581 hispgrp->pg_session != mysession)
582 continue;
583 PROC_LOCK(p);
584 if (p->p_state == PRS_ZOMBIE) {
585 PROC_UNLOCK(p);
586 continue;
587 }
588 PROC_UNLOCK(p);
589 pgadjustjobc(hispgrp, entering);
590 }
591 }
592
593 /*
594 * A process group has become orphaned;
595 * if there are any stopped processes in the group,
596 * hang-up all process in that group.
597 */
598 static void
599 orphanpg(pg)
600 struct pgrp *pg;
601 {
602 register struct proc *p;
603
604 PGRP_LOCK_ASSERT(pg, MA_OWNED);
605
606 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
607 PROC_LOCK(p);
608 if (P_SHOULDSTOP(p)) {
609 PROC_UNLOCK(p);
610 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
611 PROC_LOCK(p);
612 psignal(p, SIGHUP);
613 psignal(p, SIGCONT);
614 PROC_UNLOCK(p);
615 }
616 return;
617 }
618 PROC_UNLOCK(p);
619 }
620 }
621
622 void
623 sessrele(struct session *s)
624 {
625 int i;
626
627 SESS_LOCK(s);
628 i = --s->s_count;
629 SESS_UNLOCK(s);
630 if (i == 0) {
631 if (s->s_ttyp != NULL)
632 ttyrel(s->s_ttyp);
633 mtx_destroy(&s->s_mtx);
634 FREE(s, M_SESSION);
635 }
636 }
637
638 #include "opt_ddb.h"
639 #ifdef DDB
640 #include <ddb/ddb.h>
641
642 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
643 {
644 register struct pgrp *pgrp;
645 register struct proc *p;
646 register int i;
647
648 for (i = 0; i <= pgrphash; i++) {
649 if (!LIST_EMPTY(&pgrphashtbl[i])) {
650 printf("\tindx %d\n", i);
651 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
652 printf(
653 "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
654 (void *)pgrp, (long)pgrp->pg_id,
655 (void *)pgrp->pg_session,
656 pgrp->pg_session->s_count,
657 (void *)LIST_FIRST(&pgrp->pg_members));
658 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
659 printf("\t\tpid %ld addr %p pgrp %p\n",
660 (long)p->p_pid, (void *)p,
661 (void *)p->p_pgrp);
662 }
663 }
664 }
665 }
666 }
667 #endif /* DDB */
668
669 /*
670 * Clear kinfo_proc and fill in any information that is common
671 * to all threads in the process.
672 * Must be called with the target process locked.
673 */
674 static void
675 fill_kinfo_proc_only(struct proc *p, struct kinfo_proc *kp)
676 {
677 struct thread *td0;
678 struct tty *tp;
679 struct session *sp;
680 struct ucred *cred;
681 struct sigacts *ps;
682
683 bzero(kp, sizeof(*kp));
684
685 kp->ki_structsize = sizeof(*kp);
686 kp->ki_paddr = p;
687 PROC_LOCK_ASSERT(p, MA_OWNED);
688 kp->ki_addr =/* p->p_addr; */0; /* XXXKSE */
689 kp->ki_args = p->p_args;
690 kp->ki_textvp = p->p_textvp;
691 #ifdef KTRACE
692 kp->ki_tracep = p->p_tracevp;
693 mtx_lock(&ktrace_mtx);
694 kp->ki_traceflag = p->p_traceflag;
695 mtx_unlock(&ktrace_mtx);
696 #endif
697 kp->ki_fd = p->p_fd;
698 kp->ki_vmspace = p->p_vmspace;
699 kp->ki_flag = p->p_flag;
700 cred = p->p_ucred;
701 if (cred) {
702 kp->ki_uid = cred->cr_uid;
703 kp->ki_ruid = cred->cr_ruid;
704 kp->ki_svuid = cred->cr_svuid;
705 /* XXX bde doesn't like KI_NGROUPS */
706 kp->ki_ngroups = min(cred->cr_ngroups, KI_NGROUPS);
707 bcopy(cred->cr_groups, kp->ki_groups,
708 kp->ki_ngroups * sizeof(gid_t));
709 kp->ki_rgid = cred->cr_rgid;
710 kp->ki_svgid = cred->cr_svgid;
711 /* If jailed(cred), emulate the old P_JAILED flag. */
712 if (jailed(cred)) {
713 kp->ki_flag |= P_JAILED;
714 /* If inside a jail, use 0 as a jail ID. */
715 if (!jailed(curthread->td_ucred))
716 kp->ki_jid = cred->cr_prison->pr_id;
717 }
718 }
719 ps = p->p_sigacts;
720 if (ps) {
721 mtx_lock(&ps->ps_mtx);
722 kp->ki_sigignore = ps->ps_sigignore;
723 kp->ki_sigcatch = ps->ps_sigcatch;
724 mtx_unlock(&ps->ps_mtx);
725 }
726 PROC_SLOCK(p);
727 if (p->p_state != PRS_NEW &&
728 p->p_state != PRS_ZOMBIE &&
729 p->p_vmspace != NULL) {
730 struct vmspace *vm = p->p_vmspace;
731
732 kp->ki_size = vm->vm_map.size;
733 kp->ki_rssize = vmspace_resident_count(vm); /*XXX*/
734 FOREACH_THREAD_IN_PROC(p, td0) {
735 if (!TD_IS_SWAPPED(td0))
736 kp->ki_rssize += td0->td_kstack_pages;
737 if (td0->td_altkstack_obj != NULL)
738 kp->ki_rssize += td0->td_altkstack_pages;
739 }
740 kp->ki_swrss = vm->vm_swrss;
741 kp->ki_tsize = vm->vm_tsize;
742 kp->ki_dsize = vm->vm_dsize;
743 kp->ki_ssize = vm->vm_ssize;
744 } else if (p->p_state == PRS_ZOMBIE)
745 kp->ki_stat = SZOMB;
746 if (kp->ki_flag & P_INMEM)
747 kp->ki_sflag = PS_INMEM;
748 else
749 kp->ki_sflag = 0;
750 /* Calculate legacy swtime as seconds since 'swtick'. */
751 kp->ki_swtime = (ticks - p->p_swtick) / hz;
752 kp->ki_pid = p->p_pid;
753 kp->ki_nice = p->p_nice;
754 rufetch(p, &kp->ki_rusage);
755 kp->ki_runtime = cputick2usec(p->p_rux.rux_runtime);
756 PROC_SUNLOCK(p);
757 if ((p->p_flag & P_INMEM) && p->p_stats != NULL) {
758 kp->ki_start = p->p_stats->p_start;
759 timevaladd(&kp->ki_start, &boottime);
760 PROC_SLOCK(p);
761 calcru(p, &kp->ki_rusage.ru_utime, &kp->ki_rusage.ru_stime);
762 PROC_SUNLOCK(p);
763 calccru(p, &kp->ki_childutime, &kp->ki_childstime);
764
765 /* Some callers want child-times in a single value */
766 kp->ki_childtime = kp->ki_childstime;
767 timevaladd(&kp->ki_childtime, &kp->ki_childutime);
768 }
769 tp = NULL;
770 if (p->p_pgrp) {
771 kp->ki_pgid = p->p_pgrp->pg_id;
772 kp->ki_jobc = p->p_pgrp->pg_jobc;
773 sp = p->p_pgrp->pg_session;
774
775 if (sp != NULL) {
776 kp->ki_sid = sp->s_sid;
777 SESS_LOCK(sp);
778 strlcpy(kp->ki_login, sp->s_login,
779 sizeof(kp->ki_login));
780 if (sp->s_ttyvp)
781 kp->ki_kiflag |= KI_CTTY;
782 if (SESS_LEADER(p))
783 kp->ki_kiflag |= KI_SLEADER;
784 tp = sp->s_ttyp;
785 SESS_UNLOCK(sp);
786 }
787 }
788 if ((p->p_flag & P_CONTROLT) && tp != NULL) {
789 kp->ki_tdev = dev2udev(tp->t_dev);
790 kp->ki_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
791 if (tp->t_session)
792 kp->ki_tsid = tp->t_session->s_sid;
793 } else
794 kp->ki_tdev = NODEV;
795 if (p->p_comm[0] != '\0')
796 strlcpy(kp->ki_comm, p->p_comm, sizeof(kp->ki_comm));
797 if (p->p_sysent && p->p_sysent->sv_name != NULL &&
798 p->p_sysent->sv_name[0] != '\0')
799 strlcpy(kp->ki_emul, p->p_sysent->sv_name, sizeof(kp->ki_emul));
800 kp->ki_siglist = p->p_siglist;
801 kp->ki_xstat = p->p_xstat;
802 kp->ki_acflag = p->p_acflag;
803 kp->ki_lock = p->p_lock;
804 if (p->p_pptr)
805 kp->ki_ppid = p->p_pptr->p_pid;
806 }
807
808 /*
809 * Fill in information that is thread specific. Must be called with p_slock
810 * locked. If 'preferthread' is set, overwrite certain process-related
811 * fields that are maintained for both threads and processes.
812 */
813 static void
814 fill_kinfo_thread(struct thread *td, struct kinfo_proc *kp, int preferthread)
815 {
816 struct proc *p;
817
818 p = td->td_proc;
819 PROC_SLOCK_ASSERT(p, MA_OWNED);
820
821 thread_lock(td);
822 if (td->td_wmesg != NULL)
823 strlcpy(kp->ki_wmesg, td->td_wmesg, sizeof(kp->ki_wmesg));
824 else
825 bzero(kp->ki_wmesg, sizeof(kp->ki_wmesg));
826 if (td->td_name[0] != '\0')
827 strlcpy(kp->ki_ocomm, td->td_name, sizeof(kp->ki_ocomm));
828 if (TD_ON_LOCK(td)) {
829 kp->ki_kiflag |= KI_LOCKBLOCK;
830 strlcpy(kp->ki_lockname, td->td_lockname,
831 sizeof(kp->ki_lockname));
832 } else {
833 kp->ki_kiflag &= ~KI_LOCKBLOCK;
834 bzero(kp->ki_lockname, sizeof(kp->ki_lockname));
835 }
836
837 if (p->p_state == PRS_NORMAL) { /* XXXKSE very approximate */
838 if (TD_ON_RUNQ(td) ||
839 TD_CAN_RUN(td) ||
840 TD_IS_RUNNING(td)) {
841 kp->ki_stat = SRUN;
842 } else if (P_SHOULDSTOP(p)) {
843 kp->ki_stat = SSTOP;
844 } else if (TD_IS_SLEEPING(td)) {
845 kp->ki_stat = SSLEEP;
846 } else if (TD_ON_LOCK(td)) {
847 kp->ki_stat = SLOCK;
848 } else {
849 kp->ki_stat = SWAIT;
850 }
851 } else if (p->p_state == PRS_ZOMBIE) {
852 kp->ki_stat = SZOMB;
853 } else {
854 kp->ki_stat = SIDL;
855 }
856
857 /* Things in the thread */
858 kp->ki_wchan = td->td_wchan;
859 kp->ki_pri.pri_level = td->td_priority;
860 kp->ki_pri.pri_native = td->td_base_pri;
861 kp->ki_lastcpu = td->td_lastcpu;
862 kp->ki_oncpu = td->td_oncpu;
863 kp->ki_tdflags = td->td_flags;
864 kp->ki_tid = td->td_tid;
865 kp->ki_numthreads = p->p_numthreads;
866 kp->ki_pcb = td->td_pcb;
867 kp->ki_kstack = (void *)td->td_kstack;
868 kp->ki_pctcpu = sched_pctcpu(td);
869 kp->ki_estcpu = td->td_estcpu;
870 kp->ki_slptime = (ticks - td->td_slptick) / hz;
871 kp->ki_pri.pri_class = td->td_pri_class;
872 kp->ki_pri.pri_user = td->td_user_pri;
873
874 if (preferthread)
875 kp->ki_runtime = cputick2usec(td->td_runtime);
876
877 /* We can't get this anymore but ps etc never used it anyway. */
878 kp->ki_rqindex = 0;
879
880 SIGSETOR(kp->ki_siglist, td->td_siglist);
881 kp->ki_sigmask = td->td_sigmask;
882 thread_unlock(td);
883 }
884
885 /*
886 * Fill in a kinfo_proc structure for the specified process.
887 * Must be called with the target process locked.
888 */
889 void
890 fill_kinfo_proc(struct proc *p, struct kinfo_proc *kp)
891 {
892
893 fill_kinfo_proc_only(p, kp);
894 PROC_SLOCK(p);
895 if (FIRST_THREAD_IN_PROC(p) != NULL)
896 fill_kinfo_thread(FIRST_THREAD_IN_PROC(p), kp, 0);
897 PROC_SUNLOCK(p);
898 }
899
900 struct pstats *
901 pstats_alloc(void)
902 {
903
904 return (malloc(sizeof(struct pstats), M_SUBPROC, M_ZERO|M_WAITOK));
905 }
906
907 /*
908 * Copy parts of p_stats; zero the rest of p_stats (statistics).
909 */
910 void
911 pstats_fork(struct pstats *src, struct pstats *dst)
912 {
913
914 bzero(&dst->pstat_startzero,
915 __rangeof(struct pstats, pstat_startzero, pstat_endzero));
916 bcopy(&src->pstat_startcopy, &dst->pstat_startcopy,
917 __rangeof(struct pstats, pstat_startcopy, pstat_endcopy));
918 }
919
920 void
921 pstats_free(struct pstats *ps)
922 {
923
924 free(ps, M_SUBPROC);
925 }
926
927 /*
928 * Locate a zombie process by number
929 */
930 struct proc *
931 zpfind(pid_t pid)
932 {
933 struct proc *p;
934
935 sx_slock(&allproc_lock);
936 LIST_FOREACH(p, &zombproc, p_list)
937 if (p->p_pid == pid) {
938 PROC_LOCK(p);
939 break;
940 }
941 sx_sunlock(&allproc_lock);
942 return (p);
943 }
944
945 #define KERN_PROC_ZOMBMASK 0x3
946 #define KERN_PROC_NOTHREADS 0x4
947
948 /*
949 * Must be called with the process locked and will return with it unlocked.
950 */
951 static int
952 sysctl_out_proc(struct proc *p, struct sysctl_req *req, int flags)
953 {
954 struct thread *td;
955 struct kinfo_proc kinfo_proc;
956 int error = 0;
957 struct proc *np;
958 pid_t pid = p->p_pid;
959
960 PROC_LOCK_ASSERT(p, MA_OWNED);
961
962 fill_kinfo_proc_only(p, &kinfo_proc);
963 if (flags & KERN_PROC_NOTHREADS) {
964 PROC_SLOCK(p);
965 if (FIRST_THREAD_IN_PROC(p) != NULL)
966 fill_kinfo_thread(FIRST_THREAD_IN_PROC(p),
967 &kinfo_proc, 0);
968 PROC_SUNLOCK(p);
969 error = SYSCTL_OUT(req, (caddr_t)&kinfo_proc,
970 sizeof(kinfo_proc));
971 } else {
972 PROC_SLOCK(p);
973 if (FIRST_THREAD_IN_PROC(p) != NULL)
974 FOREACH_THREAD_IN_PROC(p, td) {
975 fill_kinfo_thread(td, &kinfo_proc, 1);
976 error = SYSCTL_OUT(req, (caddr_t)&kinfo_proc,
977 sizeof(kinfo_proc));
978 if (error)
979 break;
980 }
981 else
982 error = SYSCTL_OUT(req, (caddr_t)&kinfo_proc,
983 sizeof(kinfo_proc));
984 PROC_SUNLOCK(p);
985 }
986 PROC_UNLOCK(p);
987 if (error)
988 return (error);
989 if (flags & KERN_PROC_ZOMBMASK)
990 np = zpfind(pid);
991 else {
992 if (pid == 0)
993 return (0);
994 np = pfind(pid);
995 }
996 if (np == NULL)
997 return EAGAIN;
998 if (np != p) {
999 PROC_UNLOCK(np);
1000 return EAGAIN;
1001 }
1002 PROC_UNLOCK(np);
1003 return (0);
1004 }
1005
1006 static int
1007 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
1008 {
1009 int *name = (int*) arg1;
1010 u_int namelen = arg2;
1011 struct proc *p;
1012 int flags, doingzomb, oid_number;
1013 int error = 0;
1014
1015 oid_number = oidp->oid_number;
1016 if (oid_number != KERN_PROC_ALL &&
1017 (oid_number & KERN_PROC_INC_THREAD) == 0)
1018 flags = KERN_PROC_NOTHREADS;
1019 else {
1020 flags = 0;
1021 oid_number &= ~KERN_PROC_INC_THREAD;
1022 }
1023 if (oid_number == KERN_PROC_PID) {
1024 if (namelen != 1)
1025 return (EINVAL);
1026 error = sysctl_wire_old_buffer(req, 0);
1027 if (error)
1028 return (error);
1029 p = pfind((pid_t)name[0]);
1030 if (!p)
1031 return (ESRCH);
1032 if ((error = p_cansee(curthread, p))) {
1033 PROC_UNLOCK(p);
1034 return (error);
1035 }
1036 error = sysctl_out_proc(p, req, flags);
1037 return (error);
1038 }
1039
1040 switch (oid_number) {
1041 case KERN_PROC_ALL:
1042 if (namelen != 0)
1043 return (EINVAL);
1044 break;
1045 case KERN_PROC_PROC:
1046 if (namelen != 0 && namelen != 1)
1047 return (EINVAL);
1048 break;
1049 default:
1050 if (namelen != 1)
1051 return (EINVAL);
1052 break;
1053 }
1054
1055 if (!req->oldptr) {
1056 /* overestimate by 5 procs */
1057 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
1058 if (error)
1059 return (error);
1060 }
1061 error = sysctl_wire_old_buffer(req, 0);
1062 if (error != 0)
1063 return (error);
1064 sx_slock(&allproc_lock);
1065 for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
1066 if (!doingzomb)
1067 p = LIST_FIRST(&allproc);
1068 else
1069 p = LIST_FIRST(&zombproc);
1070 for (; p != 0; p = LIST_NEXT(p, p_list)) {
1071 /*
1072 * Skip embryonic processes.
1073 */
1074 PROC_SLOCK(p);
1075 if (p->p_state == PRS_NEW) {
1076 PROC_SUNLOCK(p);
1077 continue;
1078 }
1079 PROC_SUNLOCK(p);
1080 PROC_LOCK(p);
1081 KASSERT(p->p_ucred != NULL,
1082 ("process credential is NULL for non-NEW proc"));
1083 /*
1084 * Show a user only appropriate processes.
1085 */
1086 if (p_cansee(curthread, p)) {
1087 PROC_UNLOCK(p);
1088 continue;
1089 }
1090 /*
1091 * TODO - make more efficient (see notes below).
1092 * do by session.
1093 */
1094 switch (oid_number) {
1095
1096 case KERN_PROC_GID:
1097 if (p->p_ucred->cr_gid != (gid_t)name[0]) {
1098 PROC_UNLOCK(p);
1099 continue;
1100 }
1101 break;
1102
1103 case KERN_PROC_PGRP:
1104 /* could do this by traversing pgrp */
1105 if (p->p_pgrp == NULL ||
1106 p->p_pgrp->pg_id != (pid_t)name[0]) {
1107 PROC_UNLOCK(p);
1108 continue;
1109 }
1110 break;
1111
1112 case KERN_PROC_RGID:
1113 if (p->p_ucred->cr_rgid != (gid_t)name[0]) {
1114 PROC_UNLOCK(p);
1115 continue;
1116 }
1117 break;
1118
1119 case KERN_PROC_SESSION:
1120 if (p->p_session == NULL ||
1121 p->p_session->s_sid != (pid_t)name[0]) {
1122 PROC_UNLOCK(p);
1123 continue;
1124 }
1125 break;
1126
1127 case KERN_PROC_TTY:
1128 if ((p->p_flag & P_CONTROLT) == 0 ||
1129 p->p_session == NULL) {
1130 PROC_UNLOCK(p);
1131 continue;
1132 }
1133 SESS_LOCK(p->p_session);
1134 if (p->p_session->s_ttyp == NULL ||
1135 dev2udev(p->p_session->s_ttyp->t_dev) !=
1136 (dev_t)name[0]) {
1137 SESS_UNLOCK(p->p_session);
1138 PROC_UNLOCK(p);
1139 continue;
1140 }
1141 SESS_UNLOCK(p->p_session);
1142 break;
1143
1144 case KERN_PROC_UID:
1145 if (p->p_ucred->cr_uid != (uid_t)name[0]) {
1146 PROC_UNLOCK(p);
1147 continue;
1148 }
1149 break;
1150
1151 case KERN_PROC_RUID:
1152 if (p->p_ucred->cr_ruid != (uid_t)name[0]) {
1153 PROC_UNLOCK(p);
1154 continue;
1155 }
1156 break;
1157
1158 case KERN_PROC_PROC:
1159 break;
1160
1161 default:
1162 break;
1163
1164 }
1165
1166 error = sysctl_out_proc(p, req, flags | doingzomb);
1167 if (error) {
1168 sx_sunlock(&allproc_lock);
1169 return (error);
1170 }
1171 }
1172 }
1173 sx_sunlock(&allproc_lock);
1174 return (0);
1175 }
1176
1177 struct pargs *
1178 pargs_alloc(int len)
1179 {
1180 struct pargs *pa;
1181
1182 MALLOC(pa, struct pargs *, sizeof(struct pargs) + len, M_PARGS,
1183 M_WAITOK);
1184 refcount_init(&pa->ar_ref, 1);
1185 pa->ar_length = len;
1186 return (pa);
1187 }
1188
1189 static void
1190 pargs_free(struct pargs *pa)
1191 {
1192
1193 FREE(pa, M_PARGS);
1194 }
1195
1196 void
1197 pargs_hold(struct pargs *pa)
1198 {
1199
1200 if (pa == NULL)
1201 return;
1202 refcount_acquire(&pa->ar_ref);
1203 }
1204
1205 void
1206 pargs_drop(struct pargs *pa)
1207 {
1208
1209 if (pa == NULL)
1210 return;
1211 if (refcount_release(&pa->ar_ref))
1212 pargs_free(pa);
1213 }
1214
1215 /*
1216 * This sysctl allows a process to retrieve the argument list or process
1217 * title for another process without groping around in the address space
1218 * of the other process. It also allow a process to set its own "process
1219 * title to a string of its own choice.
1220 */
1221 static int
1222 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
1223 {
1224 int *name = (int*) arg1;
1225 u_int namelen = arg2;
1226 struct pargs *newpa, *pa;
1227 struct proc *p;
1228 int error = 0;
1229
1230 if (namelen != 1)
1231 return (EINVAL);
1232
1233 p = pfind((pid_t)name[0]);
1234 if (!p)
1235 return (ESRCH);
1236
1237 if ((error = p_cansee(curthread, p)) != 0) {
1238 PROC_UNLOCK(p);
1239 return (error);
1240 }
1241
1242 if (req->newptr && curproc != p) {
1243 PROC_UNLOCK(p);
1244 return (EPERM);
1245 }
1246
1247 pa = p->p_args;
1248 pargs_hold(pa);
1249 PROC_UNLOCK(p);
1250 if (req->oldptr != NULL && pa != NULL)
1251 error = SYSCTL_OUT(req, pa->ar_args, pa->ar_length);
1252 pargs_drop(pa);
1253 if (error != 0 || req->newptr == NULL)
1254 return (error);
1255
1256 if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
1257 return (ENOMEM);
1258 newpa = pargs_alloc(req->newlen);
1259 error = SYSCTL_IN(req, newpa->ar_args, req->newlen);
1260 if (error != 0) {
1261 pargs_free(newpa);
1262 return (error);
1263 }
1264 PROC_LOCK(p);
1265 pa = p->p_args;
1266 p->p_args = newpa;
1267 PROC_UNLOCK(p);
1268 pargs_drop(pa);
1269 return (0);
1270 }
1271
1272 /*
1273 * This sysctl allows a process to retrieve the path of the executable for
1274 * itself or another process.
1275 */
1276 static int
1277 sysctl_kern_proc_pathname(SYSCTL_HANDLER_ARGS)
1278 {
1279 pid_t *pidp = (pid_t *)arg1;
1280 unsigned int arglen = arg2;
1281 struct proc *p;
1282 struct vnode *vp;
1283 char *retbuf, *freebuf;
1284 int error;
1285
1286 if (arglen != 1)
1287 return (EINVAL);
1288 if (*pidp == -1) { /* -1 means this process */
1289 p = req->td->td_proc;
1290 } else {
1291 p = pfind(*pidp);
1292 if (p == NULL)
1293 return (ESRCH);
1294 if ((error = p_cansee(curthread, p)) != 0) {
1295 PROC_UNLOCK(p);
1296 return (error);
1297 }
1298 }
1299
1300 vp = p->p_textvp;
1301 if (vp == NULL) {
1302 if (*pidp != -1)
1303 PROC_UNLOCK(p);
1304 return (0);
1305 }
1306 vref(vp);
1307 if (*pidp != -1)
1308 PROC_UNLOCK(p);
1309 error = vn_fullpath(req->td, vp, &retbuf, &freebuf);
1310 vrele(vp);
1311 if (error)
1312 return (error);
1313 error = SYSCTL_OUT(req, retbuf, strlen(retbuf) + 1);
1314 free(freebuf, M_TEMP);
1315 return (error);
1316 }
1317
1318 static int
1319 sysctl_kern_proc_sv_name(SYSCTL_HANDLER_ARGS)
1320 {
1321 struct proc *p;
1322 char *sv_name;
1323 int *name;
1324 int namelen;
1325 int error;
1326
1327 namelen = arg2;
1328 if (namelen != 1)
1329 return (EINVAL);
1330
1331 name = (int *)arg1;
1332 if ((p = pfind((pid_t)name[0])) == NULL)
1333 return (ESRCH);
1334 if ((error = p_cansee(curthread, p))) {
1335 PROC_UNLOCK(p);
1336 return (error);
1337 }
1338 sv_name = p->p_sysent->sv_name;
1339 PROC_UNLOCK(p);
1340 return (sysctl_handle_string(oidp, sv_name, 0, req));
1341 }
1342
1343 #ifdef KINFO_OVMENTRY_SIZE
1344 CTASSERT(sizeof(struct kinfo_ovmentry) == KINFO_OVMENTRY_SIZE);
1345 #endif
1346
1347 /* Compatability with early 7-stable */
1348 static int
1349 sysctl_kern_proc_ovmmap(SYSCTL_HANDLER_ARGS)
1350 {
1351 vm_map_entry_t entry, tmp_entry;
1352 unsigned int last_timestamp;
1353 char *fullpath, *freepath;
1354 struct kinfo_ovmentry *kve;
1355 struct vattr va;
1356 struct ucred *cred;
1357 int error, *name;
1358 struct vnode *vp;
1359 struct proc *p;
1360 vm_map_t map;
1361 struct vmspace *vm;
1362
1363 name = (int *)arg1;
1364 if ((p = pfind((pid_t)name[0])) == NULL)
1365 return (ESRCH);
1366 if (p->p_flag & P_WEXIT) {
1367 PROC_UNLOCK(p);
1368 return (ESRCH);
1369 }
1370 if ((error = p_candebug(curthread, p))) {
1371 PROC_UNLOCK(p);
1372 return (error);
1373 }
1374 _PHOLD(p);
1375 PROC_UNLOCK(p);
1376 vm = vmspace_acquire_ref(p);
1377 if (vm == NULL) {
1378 PRELE(p);
1379 return (ESRCH);
1380 }
1381 kve = malloc(sizeof(*kve), M_TEMP, M_WAITOK);
1382
1383 map = &p->p_vmspace->vm_map; /* XXXRW: More locking required? */
1384 vm_map_lock_read(map);
1385 for (entry = map->header.next; entry != &map->header;
1386 entry = entry->next) {
1387 vm_object_t obj, tobj, lobj;
1388 vm_offset_t addr;
1389 int vfslocked;
1390
1391 if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
1392 continue;
1393
1394 bzero(kve, sizeof(*kve));
1395 kve->kve_structsize = sizeof(*kve);
1396
1397 kve->kve_private_resident = 0;
1398 obj = entry->object.vm_object;
1399 if (obj != NULL) {
1400 VM_OBJECT_LOCK(obj);
1401 if (obj->shadow_count == 1)
1402 kve->kve_private_resident =
1403 obj->resident_page_count;
1404 }
1405 kve->kve_resident = 0;
1406 addr = entry->start;
1407 while (addr < entry->end) {
1408 if (pmap_extract(map->pmap, addr))
1409 kve->kve_resident++;
1410 addr += PAGE_SIZE;
1411 }
1412
1413 for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) {
1414 if (tobj != obj)
1415 VM_OBJECT_LOCK(tobj);
1416 if (lobj != obj)
1417 VM_OBJECT_UNLOCK(lobj);
1418 lobj = tobj;
1419 }
1420
1421 kve->kve_start = (void*)entry->start;
1422 kve->kve_end = (void*)entry->end;
1423 kve->kve_offset = (off_t)entry->offset;
1424
1425 if (entry->protection & VM_PROT_READ)
1426 kve->kve_protection |= KVME_PROT_READ;
1427 if (entry->protection & VM_PROT_WRITE)
1428 kve->kve_protection |= KVME_PROT_WRITE;
1429 if (entry->protection & VM_PROT_EXECUTE)
1430 kve->kve_protection |= KVME_PROT_EXEC;
1431
1432 if (entry->eflags & MAP_ENTRY_COW)
1433 kve->kve_flags |= KVME_FLAG_COW;
1434 if (entry->eflags & MAP_ENTRY_NEEDS_COPY)
1435 kve->kve_flags |= KVME_FLAG_NEEDS_COPY;
1436
1437 last_timestamp = map->timestamp;
1438 vm_map_unlock_read(map);
1439
1440 kve->kve_fileid = 0;
1441 kve->kve_fsid = 0;
1442 freepath = NULL;
1443 fullpath = "";
1444 if (lobj) {
1445 vp = NULL;
1446 switch (lobj->type) {
1447 case OBJT_DEFAULT:
1448 kve->kve_type = KVME_TYPE_DEFAULT;
1449 break;
1450 case OBJT_VNODE:
1451 kve->kve_type = KVME_TYPE_VNODE;
1452 vp = lobj->handle;
1453 vref(vp);
1454 break;
1455 case OBJT_SWAP:
1456 kve->kve_type = KVME_TYPE_SWAP;
1457 break;
1458 case OBJT_DEVICE:
1459 kve->kve_type = KVME_TYPE_DEVICE;
1460 break;
1461 case OBJT_PHYS:
1462 kve->kve_type = KVME_TYPE_PHYS;
1463 break;
1464 case OBJT_DEAD:
1465 kve->kve_type = KVME_TYPE_DEAD;
1466 break;
1467 default:
1468 kve->kve_type = KVME_TYPE_UNKNOWN;
1469 break;
1470 }
1471 if (lobj != obj)
1472 VM_OBJECT_UNLOCK(lobj);
1473
1474 kve->kve_ref_count = obj->ref_count;
1475 kve->kve_shadow_count = obj->shadow_count;
1476 VM_OBJECT_UNLOCK(obj);
1477 if (vp != NULL) {
1478 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
1479 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY,
1480 curthread);
1481 vn_fullpath(curthread, vp, &fullpath,
1482 &freepath);
1483 cred = curthread->td_ucred;
1484 if (VOP_GETATTR(vp, &va, cred, curthread) == 0) {
1485 kve->kve_fileid = va.va_fileid;
1486 kve->kve_fsid = va.va_fsid;
1487 }
1488 vput(vp);
1489 VFS_UNLOCK_GIANT(vfslocked);
1490 }
1491 } else {
1492 kve->kve_type = KVME_TYPE_NONE;
1493 kve->kve_ref_count = 0;
1494 kve->kve_shadow_count = 0;
1495 }
1496
1497 strlcpy(kve->kve_path, fullpath, sizeof(kve->kve_path));
1498 if (freepath != NULL)
1499 free(freepath, M_TEMP);
1500
1501 error = SYSCTL_OUT(req, kve, sizeof(*kve));
1502 vm_map_lock_read(map);
1503 if (error)
1504 break;
1505 if (last_timestamp + 1 != map->timestamp) {
1506 vm_map_lookup_entry(map, addr - 1, &tmp_entry);
1507 entry = tmp_entry;
1508 }
1509 }
1510 vm_map_unlock_read(map);
1511 vmspace_free(vm);
1512 PRELE(p);
1513 free(kve, M_TEMP);
1514 return (error);
1515 }
1516
1517 #ifdef KINFO_VMENTRY_SIZE
1518 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
1519 #endif
1520
1521 static int
1522 sysctl_kern_proc_vmmap(SYSCTL_HANDLER_ARGS)
1523 {
1524 vm_map_entry_t entry, tmp_entry;
1525 unsigned int last_timestamp;
1526 char *fullpath, *freepath;
1527 struct kinfo_vmentry *kve;
1528 struct vattr va;
1529 struct ucred *cred;
1530 int error, *name;
1531 struct vnode *vp;
1532 struct proc *p;
1533 struct vmspace *vm;
1534 vm_map_t map;
1535
1536 name = (int *)arg1;
1537 if ((p = pfind((pid_t)name[0])) == NULL)
1538 return (ESRCH);
1539 if (p->p_flag & P_WEXIT) {
1540 PROC_UNLOCK(p);
1541 return (ESRCH);
1542 }
1543 if ((error = p_candebug(curthread, p))) {
1544 PROC_UNLOCK(p);
1545 return (error);
1546 }
1547 _PHOLD(p);
1548 PROC_UNLOCK(p);
1549 vm = vmspace_acquire_ref(p);
1550 if (vm == NULL) {
1551 PRELE(p);
1552 return (ESRCH);
1553 }
1554 kve = malloc(sizeof(*kve), M_TEMP, M_WAITOK);
1555
1556 map = &vm->vm_map; /* XXXRW: More locking required? */
1557 vm_map_lock_read(map);
1558 for (entry = map->header.next; entry != &map->header;
1559 entry = entry->next) {
1560 vm_object_t obj, tobj, lobj;
1561 vm_offset_t addr;
1562 int vfslocked;
1563
1564 if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
1565 continue;
1566
1567 bzero(kve, sizeof(*kve));
1568
1569 kve->kve_private_resident = 0;
1570 obj = entry->object.vm_object;
1571 if (obj != NULL) {
1572 VM_OBJECT_LOCK(obj);
1573 if (obj->shadow_count == 1)
1574 kve->kve_private_resident =
1575 obj->resident_page_count;
1576 }
1577 kve->kve_resident = 0;
1578 addr = entry->start;
1579 while (addr < entry->end) {
1580 if (pmap_extract(map->pmap, addr))
1581 kve->kve_resident++;
1582 addr += PAGE_SIZE;
1583 }
1584
1585 for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) {
1586 if (tobj != obj)
1587 VM_OBJECT_LOCK(tobj);
1588 if (lobj != obj)
1589 VM_OBJECT_UNLOCK(lobj);
1590 lobj = tobj;
1591 }
1592
1593 kve->kve_start = entry->start;
1594 kve->kve_end = entry->end;
1595 kve->kve_offset = entry->offset;
1596
1597 if (entry->protection & VM_PROT_READ)
1598 kve->kve_protection |= KVME_PROT_READ;
1599 if (entry->protection & VM_PROT_WRITE)
1600 kve->kve_protection |= KVME_PROT_WRITE;
1601 if (entry->protection & VM_PROT_EXECUTE)
1602 kve->kve_protection |= KVME_PROT_EXEC;
1603
1604 if (entry->eflags & MAP_ENTRY_COW)
1605 kve->kve_flags |= KVME_FLAG_COW;
1606 if (entry->eflags & MAP_ENTRY_NEEDS_COPY)
1607 kve->kve_flags |= KVME_FLAG_NEEDS_COPY;
1608
1609 last_timestamp = map->timestamp;
1610 vm_map_unlock_read(map);
1611
1612 kve->kve_fileid = 0;
1613 kve->kve_fsid = 0;
1614 freepath = NULL;
1615 fullpath = "";
1616 if (lobj) {
1617 vp = NULL;
1618 switch (lobj->type) {
1619 case OBJT_DEFAULT:
1620 kve->kve_type = KVME_TYPE_DEFAULT;
1621 break;
1622 case OBJT_VNODE:
1623 kve->kve_type = KVME_TYPE_VNODE;
1624 vp = lobj->handle;
1625 vref(vp);
1626 break;
1627 case OBJT_SWAP:
1628 kve->kve_type = KVME_TYPE_SWAP;
1629 break;
1630 case OBJT_DEVICE:
1631 kve->kve_type = KVME_TYPE_DEVICE;
1632 break;
1633 case OBJT_PHYS:
1634 kve->kve_type = KVME_TYPE_PHYS;
1635 break;
1636 case OBJT_DEAD:
1637 kve->kve_type = KVME_TYPE_DEAD;
1638 break;
1639 default:
1640 kve->kve_type = KVME_TYPE_UNKNOWN;
1641 break;
1642 }
1643 if (lobj != obj)
1644 VM_OBJECT_UNLOCK(lobj);
1645
1646 kve->kve_ref_count = obj->ref_count;
1647 kve->kve_shadow_count = obj->shadow_count;
1648 VM_OBJECT_UNLOCK(obj);
1649 if (vp != NULL) {
1650 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
1651 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY,
1652 curthread);
1653 vn_fullpath(curthread, vp, &fullpath,
1654 &freepath);
1655 cred = curthread->td_ucred;
1656 if (VOP_GETATTR(vp, &va, cred, curthread) == 0) {
1657 kve->kve_fileid = va.va_fileid;
1658 kve->kve_fsid = va.va_fsid;
1659 }
1660 vput(vp);
1661 VFS_UNLOCK_GIANT(vfslocked);
1662 }
1663 } else {
1664 kve->kve_type = KVME_TYPE_NONE;
1665 kve->kve_ref_count = 0;
1666 kve->kve_shadow_count = 0;
1667 }
1668
1669 strlcpy(kve->kve_path, fullpath, sizeof(kve->kve_path));
1670 if (freepath != NULL)
1671 free(freepath, M_TEMP);
1672
1673 /* Pack record size down */
1674 kve->kve_structsize = offsetof(struct kinfo_vmentry, kve_path) +
1675 strlen(kve->kve_path) + 1;
1676 kve->kve_structsize = roundup(kve->kve_structsize,
1677 sizeof(uint64_t));
1678 error = SYSCTL_OUT(req, kve, kve->kve_structsize);
1679 vm_map_lock_read(map);
1680 if (error)
1681 break;
1682 if (last_timestamp + 1 != map->timestamp) {
1683 vm_map_lookup_entry(map, addr - 1, &tmp_entry);
1684 entry = tmp_entry;
1685 }
1686 }
1687 vm_map_unlock_read(map);
1688 vmspace_free(vm);
1689 PRELE(p);
1690 free(kve, M_TEMP);
1691 return (error);
1692 }
1693
1694 #if defined(STACK) || defined(DDB)
1695 static int
1696 sysctl_kern_proc_kstack(SYSCTL_HANDLER_ARGS)
1697 {
1698 struct kinfo_kstack *kkstp;
1699 int error, i, *name, numthreads;
1700 lwpid_t *lwpidarray;
1701 struct thread *td;
1702 struct stack *st;
1703 struct sbuf sb;
1704 struct proc *p;
1705
1706 name = (int *)arg1;
1707 if ((p = pfind((pid_t)name[0])) == NULL)
1708 return (ESRCH);
1709 /* XXXRW: Not clear ESRCH is the right error during proc execve(). */
1710 if (p->p_flag & P_WEXIT || p->p_flag & P_INEXEC) {
1711 PROC_UNLOCK(p);
1712 return (ESRCH);
1713 }
1714 if ((error = p_candebug(curthread, p))) {
1715 PROC_UNLOCK(p);
1716 return (error);
1717 }
1718 _PHOLD(p);
1719 PROC_UNLOCK(p);
1720
1721 kkstp = malloc(sizeof(*kkstp), M_TEMP, M_WAITOK);
1722 st = stack_create();
1723
1724 lwpidarray = NULL;
1725 numthreads = 0;
1726 PROC_SLOCK(p);
1727 repeat:
1728 if (numthreads < p->p_numthreads) {
1729 if (lwpidarray != NULL) {
1730 free(lwpidarray, M_TEMP);
1731 lwpidarray = NULL;
1732 }
1733 numthreads = p->p_numthreads;
1734 PROC_SUNLOCK(p);
1735 lwpidarray = malloc(sizeof(*lwpidarray) * numthreads, M_TEMP,
1736 M_WAITOK | M_ZERO);
1737 PROC_SLOCK(p);
1738 goto repeat;
1739 }
1740 PROC_SUNLOCK(p);
1741 i = 0;
1742
1743 /*
1744 * XXXRW: During the below loop, execve(2) and countless other sorts
1745 * of changes could have taken place. Should we check to see if the
1746 * vmspace has been replaced, or the like, in order to prevent
1747 * giving a snapshot that spans, say, execve(2), with some threads
1748 * before and some after? Among other things, the credentials could
1749 * have changed, in which case the right to extract debug info might
1750 * no longer be assured.
1751 */
1752 PROC_LOCK(p);
1753 FOREACH_THREAD_IN_PROC(p, td) {
1754 KASSERT(i < numthreads,
1755 ("sysctl_kern_proc_kstack: numthreads"));
1756 lwpidarray[i] = td->td_tid;
1757 i++;
1758 }
1759 numthreads = i;
1760 for (i = 0; i < numthreads; i++) {
1761 td = thread_find(p, lwpidarray[i]);
1762 if (td == NULL) {
1763 continue;
1764 }
1765 bzero(kkstp, sizeof(*kkstp));
1766 (void)sbuf_new(&sb, kkstp->kkst_trace,
1767 sizeof(kkstp->kkst_trace), SBUF_FIXEDLEN);
1768 thread_lock(td);
1769 kkstp->kkst_tid = td->td_tid;
1770 if (TD_IS_SWAPPED(td))
1771 kkstp->kkst_state = KKST_STATE_SWAPPED;
1772 else if (TD_IS_RUNNING(td))
1773 kkstp->kkst_state = KKST_STATE_RUNNING;
1774 else {
1775 kkstp->kkst_state = KKST_STATE_STACKOK;
1776 stack_save_td(st, td);
1777 }
1778 thread_unlock(td);
1779 PROC_UNLOCK(p);
1780 stack_sbuf_print(&sb, st);
1781 sbuf_finish(&sb);
1782 sbuf_delete(&sb);
1783 error = SYSCTL_OUT(req, kkstp, sizeof(*kkstp));
1784 PROC_LOCK(p);
1785 if (error)
1786 break;
1787 }
1788 _PRELE(p);
1789 PROC_UNLOCK(p);
1790 if (lwpidarray != NULL)
1791 free(lwpidarray, M_TEMP);
1792 stack_destroy(st);
1793 free(kkstp, M_TEMP);
1794 return (error);
1795 }
1796 #endif
1797
1798 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
1799
1800 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
1801 0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
1802
1803 static SYSCTL_NODE(_kern_proc, KERN_PROC_GID, gid, CTLFLAG_RD,
1804 sysctl_kern_proc, "Process table");
1805
1806 static SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
1807 sysctl_kern_proc, "Process table");
1808
1809 static SYSCTL_NODE(_kern_proc, KERN_PROC_RGID, rgid, CTLFLAG_RD,
1810 sysctl_kern_proc, "Process table");
1811
1812 static SYSCTL_NODE(_kern_proc, KERN_PROC_SESSION, sid, CTLFLAG_RD,
1813 sysctl_kern_proc, "Process table");
1814
1815 static SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
1816 sysctl_kern_proc, "Process table");
1817
1818 static SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
1819 sysctl_kern_proc, "Process table");
1820
1821 static SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
1822 sysctl_kern_proc, "Process table");
1823
1824 static SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
1825 sysctl_kern_proc, "Process table");
1826
1827 static SYSCTL_NODE(_kern_proc, KERN_PROC_PROC, proc, CTLFLAG_RD,
1828 sysctl_kern_proc, "Return process table, no threads");
1829
1830 static SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args,
1831 CTLFLAG_RW | CTLFLAG_ANYBODY,
1832 sysctl_kern_proc_args, "Process argument list");
1833
1834 static SYSCTL_NODE(_kern_proc, KERN_PROC_PATHNAME, pathname, CTLFLAG_RD,
1835 sysctl_kern_proc_pathname, "Process executable path");
1836
1837 static SYSCTL_NODE(_kern_proc, KERN_PROC_SV_NAME, sv_name, CTLFLAG_RD,
1838 sysctl_kern_proc_sv_name, "Process syscall vector name (ABI type)");
1839
1840 static SYSCTL_NODE(_kern_proc, (KERN_PROC_GID | KERN_PROC_INC_THREAD), gid_td,
1841 CTLFLAG_RD, sysctl_kern_proc, "Process table");
1842
1843 static SYSCTL_NODE(_kern_proc, (KERN_PROC_PGRP | KERN_PROC_INC_THREAD), pgrp_td,
1844 CTLFLAG_RD, sysctl_kern_proc, "Process table");
1845
1846 static SYSCTL_NODE(_kern_proc, (KERN_PROC_RGID | KERN_PROC_INC_THREAD), rgid_td,
1847 CTLFLAG_RD, sysctl_kern_proc, "Process table");
1848
1849 static SYSCTL_NODE(_kern_proc, (KERN_PROC_SESSION | KERN_PROC_INC_THREAD),
1850 sid_td, CTLFLAG_RD, sysctl_kern_proc, "Process table");
1851
1852 static SYSCTL_NODE(_kern_proc, (KERN_PROC_TTY | KERN_PROC_INC_THREAD), tty_td,
1853 CTLFLAG_RD, sysctl_kern_proc, "Process table");
1854
1855 static SYSCTL_NODE(_kern_proc, (KERN_PROC_UID | KERN_PROC_INC_THREAD), uid_td,
1856 CTLFLAG_RD, sysctl_kern_proc, "Process table");
1857
1858 static SYSCTL_NODE(_kern_proc, (KERN_PROC_RUID | KERN_PROC_INC_THREAD), ruid_td,
1859 CTLFLAG_RD, sysctl_kern_proc, "Process table");
1860
1861 static SYSCTL_NODE(_kern_proc, (KERN_PROC_PID | KERN_PROC_INC_THREAD), pid_td,
1862 CTLFLAG_RD, sysctl_kern_proc, "Process table");
1863
1864 static SYSCTL_NODE(_kern_proc, (KERN_PROC_PROC | KERN_PROC_INC_THREAD), proc_td,
1865 CTLFLAG_RD, sysctl_kern_proc, "Return process table, no threads");
1866
1867 static SYSCTL_NODE(_kern_proc, KERN_PROC_OVMMAP, ovmmap, CTLFLAG_RD,
1868 sysctl_kern_proc_ovmmap, "Old Process vm map entries");
1869
1870 static SYSCTL_NODE(_kern_proc, KERN_PROC_VMMAP, vmmap, CTLFLAG_RD,
1871 sysctl_kern_proc_vmmap, "Process vm map entries");
1872
1873 #if defined(STACK) || defined(DDB)
1874 static SYSCTL_NODE(_kern_proc, KERN_PROC_KSTACK, kstack, CTLFLAG_RD,
1875 sysctl_kern_proc_kstack, "Process kernel stacks");
1876 #endif
Cache object: 421f2796aa490a7751e93fb5281afc07
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