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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 1.17 2004/09/13 16:22:36 dillon 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>
53 #include <machine/smp.h>
55 static MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
56 MALLOC_DEFINE(M_SESSION, "session", "session header");
57 static MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
58 MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
60 int ps_showallprocs = 1;
61 static int ps_showallthreads = 1;
62 SYSCTL_INT(_kern, OID_AUTO, ps_showallprocs, CTLFLAG_RW,
63 &ps_showallprocs, 0, "");
64 SYSCTL_INT(_kern, OID_AUTO, ps_showallthreads, CTLFLAG_RW,
65 &ps_showallthreads, 0, "");
67 static void pgdelete (struct pgrp *);
69 static void orphanpg (struct pgrp *pg);
74 struct pidhashhead *pidhashtbl;
76 struct pgrphashhead *pgrphashtbl;
78 struct proclist allproc;
79 struct proclist zombproc;
81 vm_zone_t thread_zone;
84 * Initialize global process hashing structures.
92 pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
93 pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
94 proc_zone = zinit("PROC", sizeof (struct proc), 0, 0, 5);
95 thread_zone = zinit("THREAD", sizeof (struct thread), 0, 0, 5);
100 * Is p an inferior of the current process?
107 for (; p != curproc; p = p->p_pptr)
114 * Locate a process by number
122 LIST_FOREACH(p, PIDHASH(pid), p_hash)
129 * Locate a process group by number
137 LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash)
138 if (pgrp->pg_id == pgid)
144 * Move p to a new or existing process group (and session)
147 enterpgrp(p, pgid, mksess)
152 struct pgrp *pgrp = pgfind(pgid);
154 KASSERT(pgrp == NULL || !mksess,
155 ("enterpgrp: setsid into non-empty pgrp"));
156 KASSERT(!SESS_LEADER(p),
157 ("enterpgrp: session leader attempted setpgrp"));
160 pid_t savepid = p->p_pid;
165 KASSERT(p->p_pid == pgid,
166 ("enterpgrp: new pgrp and pid != pgid"));
167 if ((np = pfind(savepid)) == NULL || np != p)
169 MALLOC(pgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP,
172 struct session *sess;
177 MALLOC(sess, struct session *, sizeof(struct session),
178 M_SESSION, M_WAITOK);
180 sess->s_sid = p->p_pid;
182 sess->s_ttyvp = NULL;
184 bcopy(p->p_session->s_login, sess->s_login,
185 sizeof(sess->s_login));
186 p->p_flag &= ~P_CONTROLT;
187 pgrp->pg_session = sess;
188 KASSERT(p == curproc,
189 ("enterpgrp: mksession and p != curproc"));
191 pgrp->pg_session = p->p_session;
192 sess_hold(pgrp->pg_session);
195 LIST_INIT(&pgrp->pg_members);
196 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
198 SLIST_INIT(&pgrp->pg_sigiolst);
199 } else if (pgrp == p->p_pgrp)
203 * Adjust eligibility of affected pgrps to participate in job control.
204 * Increment eligibility counts before decrementing, otherwise we
205 * could reach 0 spuriously during the first call.
208 fixjobc(p, p->p_pgrp, 0);
210 LIST_REMOVE(p, p_pglist);
211 if (LIST_EMPTY(&p->p_pgrp->pg_members))
214 LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
219 * remove process from process group
226 LIST_REMOVE(p, p_pglist);
227 if (LIST_EMPTY(&p->p_pgrp->pg_members))
234 * delete a process group
242 * Reset any sigio structures pointing to us as a result of
243 * F_SETOWN with our pgid.
245 funsetownlst(&pgrp->pg_sigiolst);
247 if (pgrp->pg_session->s_ttyp != NULL &&
248 pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
249 pgrp->pg_session->s_ttyp->t_pgrp = NULL;
250 LIST_REMOVE(pgrp, pg_hash);
251 sess_rele(pgrp->pg_session);
256 * Adjust the ref count on a session structure. When the ref count falls to
257 * zero the tty is disassociated from the session and the session structure
258 * is freed. Note that tty assocation is not itself ref-counted.
261 sess_hold(struct session *sp)
267 sess_rele(struct session *sp)
269 KKASSERT(sp->s_count > 0);
270 if (--sp->s_count == 0) {
271 if (sp->s_ttyp && sp->s_ttyp->t_session) {
272 #ifdef TTY_DO_FULL_CLOSE
273 /* FULL CLOSE, see ttyclearsession() */
274 KKASSERT(sp->s_ttyp->t_session == sp);
275 sp->s_ttyp->t_session = NULL;
277 /* HALF CLOSE, see ttyclearsession() */
278 if (sp->s_ttyp->t_session == sp)
279 sp->s_ttyp->t_session = NULL;
287 * Adjust pgrp jobc counters when specified process changes process group.
288 * We count the number of processes in each process group that "qualify"
289 * the group for terminal job control (those with a parent in a different
290 * process group of the same session). If that count reaches zero, the
291 * process group becomes orphaned. Check both the specified process'
292 * process group and that of its children.
293 * entering == 0 => p is leaving specified group.
294 * entering == 1 => p is entering specified group.
297 fixjobc(p, pgrp, entering)
302 struct pgrp *hispgrp;
303 struct session *mysession = pgrp->pg_session;
306 * Check p's parent to see whether p qualifies its own process
307 * group; if so, adjust count for p's process group.
309 if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
310 hispgrp->pg_session == mysession) {
313 else if (--pgrp->pg_jobc == 0)
318 * Check this process' children to see whether they qualify
319 * their process groups; if so, adjust counts for children's
322 LIST_FOREACH(p, &p->p_children, p_sibling)
323 if ((hispgrp = p->p_pgrp) != pgrp &&
324 hispgrp->pg_session == mysession &&
325 p->p_stat != SZOMB) {
328 else if (--hispgrp->pg_jobc == 0)
334 * A process group has become orphaned;
335 * if there are any stopped processes in the group,
336 * hang-up all process in that group.
344 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
345 if (p->p_stat == SSTOP) {
346 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
359 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
365 for (i = 0; i <= pgrphash; i++) {
366 if (!LIST_EMPTY(&pgrphashtbl[i])) {
367 printf("\tindx %d\n", i);
368 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
370 "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
371 (void *)pgrp, (long)pgrp->pg_id,
372 (void *)pgrp->pg_session,
373 pgrp->pg_session->s_count,
374 (void *)LIST_FIRST(&pgrp->pg_members));
375 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
376 printf("\t\tpid %ld addr %p pgrp %p\n",
377 (long)p->p_pid, (void *)p,
387 * Fill in an eproc structure for the specified thread.
390 fill_eproc_td(thread_t td, struct eproc *ep, struct proc *xp)
392 bzero(ep, sizeof(*ep));
394 ep->e_uticks = td->td_uticks;
395 ep->e_sticks = td->td_sticks;
396 ep->e_iticks = td->td_iticks;
398 ep->e_cpuid = td->td_gd->gd_cpuid;
400 strncpy(ep->e_wmesg, td->td_wmesg, WMESGLEN);
401 ep->e_wmesg[WMESGLEN] = 0;
405 * Fake up portions of the proc structure copied out by the sysctl
406 * to return useful information. Note that using td_pri directly
407 * is messy because it includes critial section data so we fake
408 * up an rtprio.prio for threads.
412 xp->p_rtprio.type = RTP_PRIO_THREAD;
413 xp->p_rtprio.prio = td->td_pri & TDPRI_MASK;
419 * Fill in an eproc structure for the specified process.
422 fill_eproc(struct proc *p, struct eproc *ep)
426 fill_eproc_td(p->p_thread, ep, NULL);
430 ep->e_ucred = *p->p_ucred;
433 ep->e_procsig = *p->p_procsig;
435 if (p->p_stat != SIDL && p->p_stat != SZOMB && p->p_vmspace != NULL) {
436 struct vmspace *vm = p->p_vmspace;
438 ep->e_vm.vm_rssize = vmspace_resident_count(vm); /*XXX*/
440 if ((p->p_flag & P_INMEM) && p->p_stats)
441 ep->e_stats = *p->p_stats;
443 ep->e_ppid = p->p_pptr->p_pid;
445 ep->e_pgid = p->p_pgrp->pg_id;
446 ep->e_jobc = p->p_pgrp->pg_jobc;
447 ep->e_sess = p->p_pgrp->pg_session;
450 bcopy(ep->e_sess->s_login, ep->e_login, sizeof(ep->e_login));
451 if (ep->e_sess->s_ttyvp)
452 ep->e_flag = EPROC_CTTY;
453 if (p->p_session && SESS_LEADER(p))
454 ep->e_flag |= EPROC_SLEADER;
457 if ((p->p_flag & P_CONTROLT) &&
458 (ep->e_sess != NULL) &&
459 ((tp = ep->e_sess->s_ttyp) != NULL)) {
460 ep->e_tdev = dev2udev(tp->t_dev);
461 ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
462 ep->e_tsess = tp->t_session;
473 LIST_FOREACH(p, &zombproc, p_list)
480 sysctl_out_proc(struct proc *p, struct thread *td, struct sysctl_req *req, int doingzomb)
486 pid_t pid = p->p_pid;
491 fill_eproc(p, &eproc);
495 * Fixup p_stat from SRUN to SSLEEP if the LWKT thread is
496 * in a thread-blocked state.
498 * XXX temporary fix which might become permanent (I'd rather
499 * not pollute the thread scheduler with knowlege about
502 if (p->p_stat == SRUN && td && (td->td_flags & TDF_BLOCKED)) {
503 xproc.p_stat = SSLEEP;
506 fill_eproc_td(td, &eproc, &xproc);
508 error = SYSCTL_OUT(req,(caddr_t)&xproc, sizeof(struct proc));
511 error = SYSCTL_OUT(req,(caddr_t)&eproc, sizeof(eproc));
514 error = SYSCTL_OUT(req,(caddr_t)td, sizeof(struct thread));
518 if (!doingzomb && pid && (pfind(pid) != p))
520 if (doingzomb && zpfind(pid) != p)
527 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
529 int *name = (int*) arg1;
530 u_int namelen = arg2;
537 struct ucred *cr1 = curproc->p_ucred;
539 if (oidp->oid_number == KERN_PROC_PID) {
542 p = pfind((pid_t)name[0]);
545 if (!PRISON_CHECK(cr1, p->p_ucred))
547 error = sysctl_out_proc(p, NULL, req, 0);
550 if (oidp->oid_number == KERN_PROC_ALL && !namelen)
552 else if (oidp->oid_number != KERN_PROC_ALL && namelen == 1)
558 /* overestimate by 5 procs */
559 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
563 for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
565 p = LIST_FIRST(&allproc);
567 p = LIST_FIRST(&zombproc);
568 for (; p != 0; p = LIST_NEXT(p, p_list)) {
570 * Show a user only their processes.
572 if ((!ps_showallprocs) && p_trespass(cr1, p->p_ucred))
575 * Skip embryonic processes.
577 if (p->p_stat == SIDL)
580 * TODO - make more efficient (see notes below).
583 switch (oidp->oid_number) {
585 /* could do this by traversing pgrp */
586 if (p->p_pgrp == NULL ||
587 p->p_pgrp->pg_id != (pid_t)name[0])
592 if ((p->p_flag & P_CONTROLT) == 0 ||
593 p->p_session == NULL ||
594 p->p_session->s_ttyp == NULL ||
595 dev2udev(p->p_session->s_ttyp->t_dev) !=
601 if (p->p_ucred == NULL ||
602 p->p_ucred->cr_uid != (uid_t)name[0])
607 if (p->p_ucred == NULL ||
608 p->p_ucred->cr_ruid != (uid_t)name[0])
613 if (!PRISON_CHECK(cr1, p->p_ucred))
616 error = sysctl_out_proc(p, NULL, req, doingzomb);
624 * Iterate over all active cpus and scan their thread list. Start
625 * with the next logical cpu and end with our original cpu. We
626 * migrate our own thread to each target cpu in order to safely scan
627 * its thread list. In the last loop we migrate back to our original
630 origcpu = mycpu->gd_cpuid;
631 for (n = 1; ps_showallthreads && n <= ncpus; ++n) {
635 nid = (origcpu + n) % ncpus;
636 if ((smp_active_mask & (1 << nid)) == 0)
638 rgd = globaldata_find(nid);
639 lwkt_setcpu_self(rgd);
640 cpu_mb1(); /* CURRENT CPU HAS CHANGED */
642 TAILQ_FOREACH(td, &mycpu->gd_tdallq, td_allq) {
645 switch (oidp->oid_number) {
655 error = sysctl_out_proc(NULL, td, req, doingzomb);
665 * This sysctl allows a process to retrieve the argument list or process
666 * title for another process without groping around in the address space
667 * of the other process. It also allow a process to set its own "process
668 * title to a string of its own choice.
671 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
673 int *name = (int*) arg1;
674 u_int namelen = arg2;
678 struct ucred *cr1 = curproc->p_ucred;
683 p = pfind((pid_t)name[0]);
687 if ((!ps_argsopen) && p_trespass(cr1, p->p_ucred))
690 if (req->newptr && curproc != p)
693 if (req->oldptr && p->p_args != NULL)
694 error = SYSCTL_OUT(req, p->p_args->ar_args, p->p_args->ar_length);
695 if (req->newptr == NULL)
698 if (p->p_args && --p->p_args->ar_ref == 0)
699 FREE(p->p_args, M_PARGS);
702 if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
705 MALLOC(pa, struct pargs *, sizeof(struct pargs) + req->newlen,
708 pa->ar_length = req->newlen;
709 error = SYSCTL_IN(req, pa->ar_args, req->newlen);
717 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
719 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
720 0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
722 SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
723 sysctl_kern_proc, "Process table");
725 SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
726 sysctl_kern_proc, "Process table");
728 SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
729 sysctl_kern_proc, "Process table");
731 SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
732 sysctl_kern_proc, "Process table");
734 SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
735 sysctl_kern_proc, "Process table");
737 SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
738 sysctl_kern_proc_args, "Process argument list");