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33 * @(#)kern_proc.c 8.7 (Berkeley) 2/14/95
34 * $FreeBSD: src/sys/kern/kern_proc.c,v 1.63.2.9 2003/05/08 07:47:16 kbyanc Exp $
35 * $DragonFly: src/sys/kern/kern_proc.c,v 1.12 2003/08/26 21:09:02 rob Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/sysctl.h>
42 #include <sys/malloc.h>
44 #include <sys/filedesc.h>
46 #include <sys/signalvar.h>
50 #include <vm/vm_map.h>
52 #include <vm/vm_zone.h>
54 static MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
55 MALLOC_DEFINE(M_SESSION, "session", "session header");
56 static MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
57 MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
59 static int ps_showallprocs = 1;
60 static int ps_showallthreads = 1;
61 SYSCTL_INT(_kern, OID_AUTO, ps_showallprocs, CTLFLAG_RW,
62 &ps_showallprocs, 0, "");
63 SYSCTL_INT(_kern, OID_AUTO, ps_showallthreads, CTLFLAG_RW,
64 &ps_showallthreads, 0, "");
66 static void pgdelete (struct pgrp *);
68 static void orphanpg (struct pgrp *pg);
73 struct pidhashhead *pidhashtbl;
75 struct pgrphashhead *pgrphashtbl;
77 struct proclist allproc;
78 struct proclist zombproc;
80 vm_zone_t thread_zone;
83 * Initialize global process hashing structures.
91 pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
92 pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
93 proc_zone = zinit("PROC", sizeof (struct proc), 0, 0, 5);
94 thread_zone = zinit("THREAD", sizeof (struct thread), 0, 0, 5);
99 * Is p an inferior of the current process?
106 for (; p != curproc; p = p->p_pptr)
113 * Locate a process by number
121 LIST_FOREACH(p, PIDHASH(pid), p_hash)
128 * Locate a process group by number
136 LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash)
137 if (pgrp->pg_id == pgid)
143 * Move p to a new or existing process group (and session)
146 enterpgrp(p, pgid, mksess)
151 struct pgrp *pgrp = pgfind(pgid);
153 KASSERT(pgrp == NULL || !mksess,
154 ("enterpgrp: setsid into non-empty pgrp"));
155 KASSERT(!SESS_LEADER(p),
156 ("enterpgrp: session leader attempted setpgrp"));
159 pid_t savepid = p->p_pid;
164 KASSERT(p->p_pid == pgid,
165 ("enterpgrp: new pgrp and pid != pgid"));
166 if ((np = pfind(savepid)) == NULL || np != p)
168 MALLOC(pgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP,
171 struct session *sess;
176 MALLOC(sess, struct session *, sizeof(struct session),
177 M_SESSION, M_WAITOK);
179 sess->s_sid = p->p_pid;
181 sess->s_ttyvp = NULL;
183 bcopy(p->p_session->s_login, sess->s_login,
184 sizeof(sess->s_login));
185 p->p_flag &= ~P_CONTROLT;
186 pgrp->pg_session = sess;
187 KASSERT(p == curproc,
188 ("enterpgrp: mksession and p != curproc"));
190 pgrp->pg_session = p->p_session;
191 pgrp->pg_session->s_count++;
194 LIST_INIT(&pgrp->pg_members);
195 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
197 SLIST_INIT(&pgrp->pg_sigiolst);
198 } else if (pgrp == p->p_pgrp)
202 * Adjust eligibility of affected pgrps to participate in job control.
203 * Increment eligibility counts before decrementing, otherwise we
204 * could reach 0 spuriously during the first call.
207 fixjobc(p, p->p_pgrp, 0);
209 LIST_REMOVE(p, p_pglist);
210 if (LIST_EMPTY(&p->p_pgrp->pg_members))
213 LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
218 * remove process from process group
225 LIST_REMOVE(p, p_pglist);
226 if (LIST_EMPTY(&p->p_pgrp->pg_members))
233 * delete a process group
241 * Reset any sigio structures pointing to us as a result of
242 * F_SETOWN with our pgid.
244 funsetownlst(&pgrp->pg_sigiolst);
246 if (pgrp->pg_session->s_ttyp != NULL &&
247 pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
248 pgrp->pg_session->s_ttyp->t_pgrp = NULL;
249 LIST_REMOVE(pgrp, pg_hash);
250 if (--pgrp->pg_session->s_count == 0)
251 FREE(pgrp->pg_session, M_SESSION);
256 * Adjust pgrp jobc counters when specified process changes process group.
257 * We count the number of processes in each process group that "qualify"
258 * the group for terminal job control (those with a parent in a different
259 * process group of the same session). If that count reaches zero, the
260 * process group becomes orphaned. Check both the specified process'
261 * process group and that of its children.
262 * entering == 0 => p is leaving specified group.
263 * entering == 1 => p is entering specified group.
266 fixjobc(p, pgrp, entering)
271 struct pgrp *hispgrp;
272 struct session *mysession = pgrp->pg_session;
275 * Check p's parent to see whether p qualifies its own process
276 * group; if so, adjust count for p's process group.
278 if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
279 hispgrp->pg_session == mysession) {
282 else if (--pgrp->pg_jobc == 0)
287 * Check this process' children to see whether they qualify
288 * their process groups; if so, adjust counts for children's
291 LIST_FOREACH(p, &p->p_children, p_sibling)
292 if ((hispgrp = p->p_pgrp) != pgrp &&
293 hispgrp->pg_session == mysession &&
294 p->p_stat != SZOMB) {
297 else if (--hispgrp->pg_jobc == 0)
303 * A process group has become orphaned;
304 * if there are any stopped processes in the group,
305 * hang-up all process in that group.
313 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
314 if (p->p_stat == SSTOP) {
315 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
328 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
334 for (i = 0; i <= pgrphash; i++) {
335 if (!LIST_EMPTY(&pgrphashtbl[i])) {
336 printf("\tindx %d\n", i);
337 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
339 "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
340 (void *)pgrp, (long)pgrp->pg_id,
341 (void *)pgrp->pg_session,
342 pgrp->pg_session->s_count,
343 (void *)LIST_FIRST(&pgrp->pg_members));
344 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
345 printf("\t\tpid %ld addr %p pgrp %p\n",
346 (long)p->p_pid, (void *)p,
356 * Fill in an eproc structure for the specified thread.
359 fill_eproc_td(thread_t td, struct eproc *ep, struct proc *xp)
361 bzero(ep, sizeof(*ep));
363 ep->e_uticks = td->td_uticks;
364 ep->e_sticks = td->td_sticks;
365 ep->e_iticks = td->td_iticks;
367 ep->e_cpuid = td->td_gd->gd_cpuid;
369 strncpy(ep->e_wmesg, td->td_wmesg, WMESGLEN);
370 ep->e_wmesg[WMESGLEN] = 0;
374 * Fake up portions of the proc structure copied out by the sysctl
375 * to return useful information. Note that using td_pri directly
376 * is messy because it includes critial section data so we fake
377 * up an rtprio.prio for threads.
381 xp->p_rtprio.type = RTP_PRIO_THREAD;
382 xp->p_rtprio.prio = td->td_pri & TDPRI_MASK;
388 * Fill in an eproc structure for the specified process.
391 fill_eproc(struct proc *p, struct eproc *ep)
395 fill_eproc_td(p->p_thread, ep, NULL);
399 ep->e_ucred = *p->p_ucred;
402 ep->e_procsig = *p->p_procsig;
404 if (p->p_stat != SIDL && p->p_stat != SZOMB && p->p_vmspace != NULL) {
405 struct vmspace *vm = p->p_vmspace;
407 ep->e_vm.vm_rssize = vmspace_resident_count(vm); /*XXX*/
409 if ((p->p_flag & P_INMEM) && p->p_stats)
410 ep->e_stats = *p->p_stats;
412 ep->e_ppid = p->p_pptr->p_pid;
414 ep->e_pgid = p->p_pgrp->pg_id;
415 ep->e_jobc = p->p_pgrp->pg_jobc;
416 ep->e_sess = p->p_pgrp->pg_session;
419 bcopy(ep->e_sess->s_login, ep->e_login, sizeof(ep->e_login));
420 if (ep->e_sess->s_ttyvp)
421 ep->e_flag = EPROC_CTTY;
422 if (p->p_session && SESS_LEADER(p))
423 ep->e_flag |= EPROC_SLEADER;
426 if ((p->p_flag & P_CONTROLT) &&
427 (ep->e_sess != NULL) &&
428 ((tp = ep->e_sess->s_ttyp) != NULL)) {
429 ep->e_tdev = dev2udev(tp->t_dev);
430 ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
431 ep->e_tsess = tp->t_session;
442 LIST_FOREACH(p, &zombproc, p_list)
449 sysctl_out_proc(struct proc *p, struct thread *td, struct sysctl_req *req, int doingzomb)
455 pid_t pid = p->p_pid;
460 fill_eproc(p, &eproc);
463 fill_eproc_td(td, &eproc, &xproc);
465 error = SYSCTL_OUT(req,(caddr_t)&xproc, sizeof(struct proc));
468 error = SYSCTL_OUT(req,(caddr_t)&eproc, sizeof(eproc));
471 error = SYSCTL_OUT(req,(caddr_t)td, sizeof(struct thread));
475 if (!doingzomb && pid && (pfind(pid) != p))
477 if (doingzomb && zpfind(pid) != p)
484 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
486 int *name = (int*) arg1;
487 u_int namelen = arg2;
492 struct ucred *cr1 = curproc->p_ucred;
494 if (oidp->oid_number == KERN_PROC_PID) {
497 p = pfind((pid_t)name[0]);
500 if (!PRISON_CHECK(cr1, p->p_ucred))
502 error = sysctl_out_proc(p, NULL, req, 0);
505 if (oidp->oid_number == KERN_PROC_ALL && !namelen)
507 else if (oidp->oid_number != KERN_PROC_ALL && namelen == 1)
513 /* overestimate by 5 procs */
514 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
518 for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
520 p = LIST_FIRST(&allproc);
522 p = LIST_FIRST(&zombproc);
523 for (; p != 0; p = LIST_NEXT(p, p_list)) {
525 * Show a user only their processes.
527 if ((!ps_showallprocs) && p_trespass(cr1, p->p_ucred))
530 * Skip embryonic processes.
532 if (p->p_stat == SIDL)
535 * TODO - make more efficient (see notes below).
538 switch (oidp->oid_number) {
540 /* could do this by traversing pgrp */
541 if (p->p_pgrp == NULL ||
542 p->p_pgrp->pg_id != (pid_t)name[0])
547 if ((p->p_flag & P_CONTROLT) == 0 ||
548 p->p_session == NULL ||
549 p->p_session->s_ttyp == NULL ||
550 dev2udev(p->p_session->s_ttyp->t_dev) !=
556 if (p->p_ucred == NULL ||
557 p->p_ucred->cr_uid != (uid_t)name[0])
562 if (p->p_ucred == NULL ||
563 p->p_ucred->cr_ruid != (uid_t)name[0])
568 if (!PRISON_CHECK(cr1, p->p_ucred))
571 error = sysctl_out_proc(p, NULL, req, doingzomb);
577 if (ps_showallthreads) {
578 TAILQ_FOREACH(td, &mycpu->gd_tdallq, td_allq) {
581 switch (oidp->oid_number) {
591 error = sysctl_out_proc(NULL, td, req, doingzomb);
601 * This sysctl allows a process to retrieve the argument list or process
602 * title for another process without groping around in the address space
603 * of the other process. It also allow a process to set its own "process
604 * title to a string of its own choice.
607 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
609 int *name = (int*) arg1;
610 u_int namelen = arg2;
614 struct ucred *cr1 = curproc->p_ucred;
619 p = pfind((pid_t)name[0]);
623 if ((!ps_argsopen) && p_trespass(cr1, p->p_ucred))
626 if (req->newptr && curproc != p)
629 if (req->oldptr && p->p_args != NULL)
630 error = SYSCTL_OUT(req, p->p_args->ar_args, p->p_args->ar_length);
631 if (req->newptr == NULL)
634 if (p->p_args && --p->p_args->ar_ref == 0)
635 FREE(p->p_args, M_PARGS);
638 if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
641 MALLOC(pa, struct pargs *, sizeof(struct pargs) + req->newlen,
644 pa->ar_length = req->newlen;
645 error = SYSCTL_IN(req, pa->ar_args, req->newlen);
653 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
655 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
656 0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
658 SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
659 sysctl_kern_proc, "Process table");
661 SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
662 sysctl_kern_proc, "Process table");
664 SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
665 sysctl_kern_proc, "Process table");
667 SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
668 sysctl_kern_proc, "Process table");
670 SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
671 sysctl_kern_proc, "Process table");
673 SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
674 sysctl_kern_proc_args, "Process argument list");