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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 1.23 2006/03/27 09:02:07 joerg 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>
45 #include <sys/filedesc.h>
47 #include <sys/signalvar.h>
51 #include <vm/vm_map.h>
53 #include <vm/vm_zone.h>
54 #include <machine/smp.h>
56 static MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
57 MALLOC_DEFINE(M_SESSION, "session", "session header");
58 static MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
59 MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
61 int ps_showallprocs = 1;
62 static int ps_showallthreads = 1;
63 SYSCTL_INT(_kern, OID_AUTO, ps_showallprocs, CTLFLAG_RW,
64 &ps_showallprocs, 0, "");
65 SYSCTL_INT(_kern, OID_AUTO, ps_showallthreads, CTLFLAG_RW,
66 &ps_showallthreads, 0, "");
68 static void pgdelete (struct pgrp *);
70 static void orphanpg (struct pgrp *pg);
75 struct pidhashhead *pidhashtbl;
77 struct pgrphashhead *pgrphashtbl;
79 struct proclist allproc;
80 struct proclist zombproc;
82 vm_zone_t thread_zone;
85 * Initialize global process hashing structures.
93 pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
94 pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
95 proc_zone = zinit("PROC", sizeof (struct proc), 0, 0, 5);
96 thread_zone = zinit("THREAD", sizeof (struct thread), 0, 0, 5);
101 * Is p an inferior of the current process?
104 inferior(struct proc *p)
107 for (; p != curproc; p = p->p_pptr)
114 * Locate a process by number
121 LIST_FOREACH(p, PIDHASH(pid), p_hash)
128 * Locate a process group by number
135 LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash)
136 if (pgrp->pg_id == pgid)
142 * Move p to a new or existing process group (and session)
145 enterpgrp(struct proc *p, pid_t pgid, int mksess)
147 struct pgrp *pgrp = pgfind(pgid);
149 KASSERT(pgrp == NULL || !mksess,
150 ("enterpgrp: setsid into non-empty pgrp"));
151 KASSERT(!SESS_LEADER(p),
152 ("enterpgrp: session leader attempted setpgrp"));
155 pid_t savepid = p->p_pid;
160 KASSERT(p->p_pid == pgid,
161 ("enterpgrp: new pgrp and pid != pgid"));
162 if ((np = pfind(savepid)) == NULL || np != p)
164 MALLOC(pgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP,
167 struct session *sess;
172 MALLOC(sess, struct session *, sizeof(struct session),
173 M_SESSION, M_WAITOK);
175 sess->s_sid = p->p_pid;
177 sess->s_ttyvp = NULL;
179 bcopy(p->p_session->s_login, sess->s_login,
180 sizeof(sess->s_login));
181 p->p_flag &= ~P_CONTROLT;
182 pgrp->pg_session = sess;
183 KASSERT(p == curproc,
184 ("enterpgrp: mksession and p != curproc"));
186 pgrp->pg_session = p->p_session;
187 sess_hold(pgrp->pg_session);
190 LIST_INIT(&pgrp->pg_members);
191 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
193 SLIST_INIT(&pgrp->pg_sigiolst);
194 } else if (pgrp == p->p_pgrp)
198 * Adjust eligibility of affected pgrps to participate in job control.
199 * Increment eligibility counts before decrementing, otherwise we
200 * could reach 0 spuriously during the first call.
203 fixjobc(p, p->p_pgrp, 0);
205 LIST_REMOVE(p, p_pglist);
206 if (LIST_EMPTY(&p->p_pgrp->pg_members))
209 LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
214 * remove process from process group
217 leavepgrp(struct proc *p)
220 LIST_REMOVE(p, p_pglist);
221 if (LIST_EMPTY(&p->p_pgrp->pg_members))
228 * delete a process group
231 pgdelete(struct pgrp *pgrp)
235 * Reset any sigio structures pointing to us as a result of
236 * F_SETOWN with our pgid.
238 funsetownlst(&pgrp->pg_sigiolst);
240 if (pgrp->pg_session->s_ttyp != NULL &&
241 pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
242 pgrp->pg_session->s_ttyp->t_pgrp = NULL;
243 LIST_REMOVE(pgrp, pg_hash);
244 sess_rele(pgrp->pg_session);
249 * Adjust the ref count on a session structure. When the ref count falls to
250 * zero the tty is disassociated from the session and the session structure
251 * is freed. Note that tty assocation is not itself ref-counted.
254 sess_hold(struct session *sp)
260 sess_rele(struct session *sp)
262 KKASSERT(sp->s_count > 0);
263 if (--sp->s_count == 0) {
264 if (sp->s_ttyp && sp->s_ttyp->t_session) {
265 #ifdef TTY_DO_FULL_CLOSE
266 /* FULL CLOSE, see ttyclearsession() */
267 KKASSERT(sp->s_ttyp->t_session == sp);
268 sp->s_ttyp->t_session = NULL;
270 /* HALF CLOSE, see ttyclearsession() */
271 if (sp->s_ttyp->t_session == sp)
272 sp->s_ttyp->t_session = NULL;
280 * Adjust pgrp jobc counters when specified process changes process group.
281 * We count the number of processes in each process group that "qualify"
282 * the group for terminal job control (those with a parent in a different
283 * process group of the same session). If that count reaches zero, the
284 * process group becomes orphaned. Check both the specified process'
285 * process group and that of its children.
286 * entering == 0 => p is leaving specified group.
287 * entering == 1 => p is entering specified group.
290 fixjobc(struct proc *p, struct pgrp *pgrp, int entering)
292 struct pgrp *hispgrp;
293 struct session *mysession = pgrp->pg_session;
296 * Check p's parent to see whether p qualifies its own process
297 * group; if so, adjust count for p's process group.
299 if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
300 hispgrp->pg_session == mysession) {
303 else if (--pgrp->pg_jobc == 0)
308 * Check this process' children to see whether they qualify
309 * their process groups; if so, adjust counts for children's
312 LIST_FOREACH(p, &p->p_children, p_sibling)
313 if ((hispgrp = p->p_pgrp) != pgrp &&
314 hispgrp->pg_session == mysession &&
315 (p->p_flag & P_ZOMBIE) == 0) {
318 else if (--hispgrp->pg_jobc == 0)
324 * A process group has become orphaned;
325 * if there are any stopped processes in the group,
326 * hang-up all process in that group.
329 orphanpg(struct pgrp *pg)
333 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
334 if (p->p_flag & P_STOPPED) {
335 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
348 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
354 for (i = 0; i <= pgrphash; i++) {
355 if (!LIST_EMPTY(&pgrphashtbl[i])) {
356 printf("\tindx %d\n", i);
357 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
359 "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
360 (void *)pgrp, (long)pgrp->pg_id,
361 (void *)pgrp->pg_session,
362 pgrp->pg_session->s_count,
363 (void *)LIST_FIRST(&pgrp->pg_members));
364 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
365 printf("\t\tpid %ld addr %p pgrp %p\n",
366 (long)p->p_pid, (void *)p,
376 * Fill in an eproc structure for the specified thread.
379 fill_eproc_td(thread_t td, struct eproc *ep, struct proc *xp)
381 bzero(ep, sizeof(*ep));
383 ep->e_uticks = td->td_uticks;
384 ep->e_sticks = td->td_sticks;
385 ep->e_iticks = td->td_iticks;
387 ep->e_cpuid = td->td_gd->gd_cpuid;
389 strncpy(ep->e_wmesg, td->td_wmesg, WMESGLEN);
390 ep->e_wmesg[WMESGLEN] = 0;
394 * Fake up portions of the proc structure copied out by the sysctl
395 * to return useful information. Note that using td_pri directly
396 * is messy because it includes critial section data so we fake
397 * up an rtprio.prio for threads.
401 xp->p_rtprio.type = RTP_PRIO_THREAD;
402 xp->p_rtprio.prio = td->td_pri & TDPRI_MASK;
408 * Fill in an eproc structure for the specified process.
411 fill_eproc(struct proc *p, struct eproc *ep)
415 fill_eproc_td(p->p_thread, ep, NULL);
419 ep->e_ucred = *p->p_ucred;
422 ep->e_procsig = *p->p_procsig;
424 if (p->p_stat != SIDL && (p->p_flag & P_ZOMBIE) == 0 &&
425 p->p_vmspace != NULL) {
426 struct vmspace *vm = p->p_vmspace;
428 ep->e_vm.vm_rssize = vmspace_resident_count(vm); /*XXX*/
430 if ((p->p_flag & P_SWAPPEDOUT) == 0 && p->p_stats)
431 ep->e_stats = *p->p_stats;
433 ep->e_ppid = p->p_pptr->p_pid;
435 ep->e_pgid = p->p_pgrp->pg_id;
436 ep->e_jobc = p->p_pgrp->pg_jobc;
437 ep->e_sess = p->p_pgrp->pg_session;
440 bcopy(ep->e_sess->s_login, ep->e_login, sizeof(ep->e_login));
441 if (ep->e_sess->s_ttyvp)
442 ep->e_flag = EPROC_CTTY;
443 if (p->p_session && SESS_LEADER(p))
444 ep->e_flag |= EPROC_SLEADER;
447 if ((p->p_flag & P_CONTROLT) &&
448 (ep->e_sess != NULL) &&
449 ((tp = ep->e_sess->s_ttyp) != NULL)) {
450 ep->e_tdev = dev2udev(tp->t_dev);
451 ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
452 ep->e_tsess = tp->t_session;
456 if (p->p_ucred->cr_prison)
457 ep->e_jailid = p->p_ucred->cr_prison->pr_id;
465 LIST_FOREACH(p, &zombproc, p_list)
472 sysctl_out_proc(struct proc *p, struct thread *td, struct sysctl_req *req, int doingzomb)
478 pid_t pid = p->p_pid;
483 fill_eproc(p, &eproc);
487 * p_stat fixup. If we are in a thread sleep mark p_stat
488 * as sleeping if the thread is blocked.
490 if (p->p_stat == SRUN && td && (td->td_flags & TDF_BLOCKED)) {
491 xproc.p_stat = SSLEEP;
494 * If the process is being stopped but is in a normal tsleep,
495 * mark it as being SSTOP.
497 if (p->p_stat == SSLEEP && (p->p_flag & P_STOPPED))
498 xproc.p_stat = SSTOP;
499 if (p->p_flag & P_ZOMBIE)
500 xproc.p_stat = SZOMB;
502 fill_eproc_td(td, &eproc, &xproc);
504 error = SYSCTL_OUT(req,(caddr_t)&xproc, sizeof(struct proc));
507 error = SYSCTL_OUT(req,(caddr_t)&eproc, sizeof(eproc));
510 error = SYSCTL_OUT(req,(caddr_t)td, sizeof(struct thread));
514 if (!doingzomb && pid && (pfind(pid) != p))
516 if (doingzomb && zpfind(pid) != p)
523 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
525 int *name = (int*) arg1;
526 u_int namelen = arg2;
533 struct ucred *cr1 = curproc->p_ucred;
535 if (oidp->oid_number == KERN_PROC_PID) {
538 p = pfind((pid_t)name[0]);
541 if (!PRISON_CHECK(cr1, p->p_ucred))
543 error = sysctl_out_proc(p, NULL, req, 0);
546 if (oidp->oid_number == KERN_PROC_ALL && !namelen)
548 else if (oidp->oid_number != KERN_PROC_ALL && namelen == 1)
554 /* overestimate by 5 procs */
555 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
559 for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
561 p = LIST_FIRST(&allproc);
563 p = LIST_FIRST(&zombproc);
564 for (; p != 0; p = LIST_NEXT(p, p_list)) {
566 * Show a user only their processes.
568 if ((!ps_showallprocs) && p_trespass(cr1, p->p_ucred))
571 * Skip embryonic processes.
573 if (p->p_stat == SIDL)
576 * TODO - make more efficient (see notes below).
579 switch (oidp->oid_number) {
581 /* could do this by traversing pgrp */
582 if (p->p_pgrp == NULL ||
583 p->p_pgrp->pg_id != (pid_t)name[0])
588 if ((p->p_flag & P_CONTROLT) == 0 ||
589 p->p_session == NULL ||
590 p->p_session->s_ttyp == NULL ||
591 dev2udev(p->p_session->s_ttyp->t_dev) !=
597 if (p->p_ucred == NULL ||
598 p->p_ucred->cr_uid != (uid_t)name[0])
603 if (p->p_ucred == NULL ||
604 p->p_ucred->cr_ruid != (uid_t)name[0])
609 if (!PRISON_CHECK(cr1, p->p_ucred))
612 error = sysctl_out_proc(p, NULL, req, doingzomb);
620 * Iterate over all active cpus and scan their thread list. Start
621 * with the next logical cpu and end with our original cpu. We
622 * migrate our own thread to each target cpu in order to safely scan
623 * its thread list. In the last loop we migrate back to our original
626 origcpu = mycpu->gd_cpuid;
627 if (!ps_showallthreads || jailed(cr1))
629 for (n = 1; n <= ncpus; ++n) {
633 nid = (origcpu + n) % ncpus;
634 if ((smp_active_mask & (1 << nid)) == 0)
636 rgd = globaldata_find(nid);
637 lwkt_setcpu_self(rgd);
639 TAILQ_FOREACH(td, &mycpu->gd_tdallq, td_allq) {
642 switch (oidp->oid_number) {
652 error = sysctl_out_proc(NULL, td, req, doingzomb);
663 * This sysctl allows a process to retrieve the argument list or process
664 * title for another process without groping around in the address space
665 * of the other process. It also allow a process to set its own "process
666 * title to a string of its own choice.
669 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
671 int *name = (int*) arg1;
672 u_int namelen = arg2;
676 struct ucred *cr1 = curproc->p_ucred;
681 p = pfind((pid_t)name[0]);
685 if ((!ps_argsopen) && p_trespass(cr1, p->p_ucred))
688 if (req->newptr && curproc != p)
691 if (req->oldptr && p->p_args != NULL)
692 error = SYSCTL_OUT(req, p->p_args->ar_args, p->p_args->ar_length);
693 if (req->newptr == NULL)
696 if (p->p_args && --p->p_args->ar_ref == 0)
697 FREE(p->p_args, M_PARGS);
700 if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
703 MALLOC(pa, struct pargs *, sizeof(struct pargs) + req->newlen,
706 pa->ar_length = req->newlen;
707 error = SYSCTL_IN(req, pa->ar_args, req->newlen);
715 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
717 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
718 0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
720 SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
721 sysctl_kern_proc, "Process table");
723 SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
724 sysctl_kern_proc, "Process table");
726 SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
727 sysctl_kern_proc, "Process table");
729 SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
730 sysctl_kern_proc, "Process table");
732 SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
733 sysctl_kern_proc, "Process table");
735 SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
736 sysctl_kern_proc_args, "Process argument list");