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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 1.6 2003/06/26 20:27:51 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>
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 SYSCTL_INT(_kern, OID_AUTO, ps_showallprocs, CTLFLAG_RW,
61 &ps_showallprocs, 0, "");
63 static void pgdelete __P((struct pgrp *));
65 static void orphanpg __P((struct pgrp *pg));
70 struct pidhashhead *pidhashtbl;
72 struct pgrphashhead *pgrphashtbl;
74 struct proclist allproc;
75 struct proclist zombproc;
77 vm_zone_t thread_zone;
80 * Initialize global process hashing structures.
88 pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
89 pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
90 proc_zone = zinit("PROC", sizeof (struct proc), 0, 0, 5);
91 thread_zone = zinit("THREAD", sizeof (struct thread), 0, 0, 5);
96 * Is p an inferior of the current process?
100 register struct proc *p;
103 for (; p != curproc; p = p->p_pptr)
110 * Locate a process by number
116 register struct proc *p;
118 LIST_FOREACH(p, PIDHASH(pid), p_hash)
125 * Locate a process group by number
131 register struct pgrp *pgrp;
133 LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash)
134 if (pgrp->pg_id == pgid)
140 * Move p to a new or existing process group (and session)
143 enterpgrp(p, pgid, mksess)
144 register struct proc *p;
148 register struct pgrp *pgrp = pgfind(pgid);
150 KASSERT(pgrp == NULL || !mksess,
151 ("enterpgrp: setsid into non-empty pgrp"));
152 KASSERT(!SESS_LEADER(p),
153 ("enterpgrp: session leader attempted setpgrp"));
156 pid_t savepid = p->p_pid;
161 KASSERT(p->p_pid == pgid,
162 ("enterpgrp: new pgrp and pid != pgid"));
163 if ((np = pfind(savepid)) == NULL || np != p)
165 MALLOC(pgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP,
168 register struct session *sess;
173 MALLOC(sess, struct session *, sizeof(struct session),
174 M_SESSION, M_WAITOK);
176 sess->s_sid = p->p_pid;
178 sess->s_ttyvp = NULL;
180 bcopy(p->p_session->s_login, sess->s_login,
181 sizeof(sess->s_login));
182 p->p_flag &= ~P_CONTROLT;
183 pgrp->pg_session = sess;
184 KASSERT(p == curproc,
185 ("enterpgrp: mksession and p != curproc"));
187 pgrp->pg_session = p->p_session;
188 pgrp->pg_session->s_count++;
191 LIST_INIT(&pgrp->pg_members);
192 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
194 SLIST_INIT(&pgrp->pg_sigiolst);
195 } else if (pgrp == p->p_pgrp)
199 * Adjust eligibility of affected pgrps to participate in job control.
200 * Increment eligibility counts before decrementing, otherwise we
201 * could reach 0 spuriously during the first call.
204 fixjobc(p, p->p_pgrp, 0);
206 LIST_REMOVE(p, p_pglist);
207 if (LIST_EMPTY(&p->p_pgrp->pg_members))
210 LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
215 * remove process from process group
219 register struct proc *p;
222 LIST_REMOVE(p, p_pglist);
223 if (LIST_EMPTY(&p->p_pgrp->pg_members))
230 * delete a process group
234 register struct pgrp *pgrp;
238 * Reset any sigio structures pointing to us as a result of
239 * F_SETOWN with our pgid.
241 funsetownlst(&pgrp->pg_sigiolst);
243 if (pgrp->pg_session->s_ttyp != NULL &&
244 pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
245 pgrp->pg_session->s_ttyp->t_pgrp = NULL;
246 LIST_REMOVE(pgrp, pg_hash);
247 if (--pgrp->pg_session->s_count == 0)
248 FREE(pgrp->pg_session, M_SESSION);
253 * Adjust pgrp jobc counters when specified process changes process group.
254 * We count the number of processes in each process group that "qualify"
255 * the group for terminal job control (those with a parent in a different
256 * process group of the same session). If that count reaches zero, the
257 * process group becomes orphaned. Check both the specified process'
258 * process group and that of its children.
259 * entering == 0 => p is leaving specified group.
260 * entering == 1 => p is entering specified group.
263 fixjobc(p, pgrp, entering)
264 register struct proc *p;
265 register struct pgrp *pgrp;
268 register struct pgrp *hispgrp;
269 register struct session *mysession = pgrp->pg_session;
272 * Check p's parent to see whether p qualifies its own process
273 * group; if so, adjust count for p's process group.
275 if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
276 hispgrp->pg_session == mysession) {
279 else if (--pgrp->pg_jobc == 0)
284 * Check this process' children to see whether they qualify
285 * their process groups; if so, adjust counts for children's
288 LIST_FOREACH(p, &p->p_children, p_sibling)
289 if ((hispgrp = p->p_pgrp) != pgrp &&
290 hispgrp->pg_session == mysession &&
291 p->p_stat != SZOMB) {
294 else if (--hispgrp->pg_jobc == 0)
300 * A process group has become orphaned;
301 * if there are any stopped processes in the group,
302 * hang-up all process in that group.
308 register struct proc *p;
310 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
311 if (p->p_stat == SSTOP) {
312 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
325 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
327 register struct pgrp *pgrp;
328 register struct proc *p;
331 for (i = 0; i <= pgrphash; i++) {
332 if (!LIST_EMPTY(&pgrphashtbl[i])) {
333 printf("\tindx %d\n", i);
334 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
336 "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
337 (void *)pgrp, (long)pgrp->pg_id,
338 (void *)pgrp->pg_session,
339 pgrp->pg_session->s_count,
340 (void *)LIST_FIRST(&pgrp->pg_members));
341 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
342 printf("\t\tpid %ld addr %p pgrp %p\n",
343 (long)p->p_pid, (void *)p,
353 * Fill in an eproc structure for the specified process.
357 register struct proc *p;
358 register struct eproc *ep;
360 register struct tty *tp;
362 bzero(ep, sizeof(*ep));
365 ep->e_uticks = p->p_thread->td_uticks;
366 ep->e_sticks = p->p_thread->td_sticks;
367 ep->e_iticks = p->p_thread->td_iticks;
369 ep->e_ucred = *p->p_ucred;
372 ep->e_procsig = *p->p_procsig;
374 if (p->p_stat != SIDL && p->p_stat != SZOMB && p->p_vmspace != NULL) {
375 register struct vmspace *vm = p->p_vmspace;
377 ep->e_vm.vm_rssize = vmspace_resident_count(vm); /*XXX*/
379 if ((p->p_flag & P_INMEM) && p->p_stats)
380 ep->e_stats = *p->p_stats;
382 ep->e_ppid = p->p_pptr->p_pid;
384 ep->e_pgid = p->p_pgrp->pg_id;
385 ep->e_jobc = p->p_pgrp->pg_jobc;
386 ep->e_sess = p->p_pgrp->pg_session;
389 bcopy(ep->e_sess->s_login, ep->e_login, sizeof(ep->e_login));
390 if (ep->e_sess->s_ttyvp)
391 ep->e_flag = EPROC_CTTY;
392 if (p->p_session && SESS_LEADER(p))
393 ep->e_flag |= EPROC_SLEADER;
396 if ((p->p_flag & P_CONTROLT) &&
397 (ep->e_sess != NULL) &&
398 ((tp = ep->e_sess->s_ttyp) != NULL)) {
399 ep->e_tdev = dev2udev(tp->t_dev);
400 ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
401 ep->e_tsess = tp->t_session;
405 strncpy(ep->e_wmesg, p->p_wmesg, WMESGLEN);
406 ep->e_wmesg[WMESGLEN] = 0;
415 LIST_FOREACH(p, &zombproc, p_list)
422 sysctl_out_proc(struct proc *p, struct sysctl_req *req, int doingzomb)
426 pid_t pid = p->p_pid;
428 fill_eproc(p, &eproc);
429 error = SYSCTL_OUT(req,(caddr_t)p, sizeof(struct proc));
432 error = SYSCTL_OUT(req,(caddr_t)&eproc, sizeof(eproc));
435 if (!doingzomb && pid && (pfind(pid) != p))
437 if (doingzomb && zpfind(pid) != p)
443 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
445 int *name = (int*) arg1;
446 u_int namelen = arg2;
450 struct ucred *cr1 = curproc->p_ucred;
452 if (oidp->oid_number == KERN_PROC_PID) {
455 p = pfind((pid_t)name[0]);
458 if (!PRISON_CHECK(cr1, p->p_ucred))
460 error = sysctl_out_proc(p, req, 0);
463 if (oidp->oid_number == KERN_PROC_ALL && !namelen)
465 else if (oidp->oid_number != KERN_PROC_ALL && namelen == 1)
471 /* overestimate by 5 procs */
472 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
476 for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
478 p = LIST_FIRST(&allproc);
480 p = LIST_FIRST(&zombproc);
481 for (; p != 0; p = LIST_NEXT(p, p_list)) {
483 * Show a user only their processes.
485 if ((!ps_showallprocs) && p_trespass(cr1, p->p_ucred))
488 * Skip embryonic processes.
490 if (p->p_stat == SIDL)
493 * TODO - make more efficient (see notes below).
496 switch (oidp->oid_number) {
499 /* could do this by traversing pgrp */
500 if (p->p_pgrp == NULL ||
501 p->p_pgrp->pg_id != (pid_t)name[0])
506 if ((p->p_flag & P_CONTROLT) == 0 ||
507 p->p_session == NULL ||
508 p->p_session->s_ttyp == NULL ||
509 dev2udev(p->p_session->s_ttyp->t_dev) !=
515 if (p->p_ucred == NULL ||
516 p->p_ucred->cr_uid != (uid_t)name[0])
521 if (p->p_ucred == NULL ||
522 p->p_ucred->cr_ruid != (uid_t)name[0])
527 if (!PRISON_CHECK(cr1, p->p_ucred))
530 error = sysctl_out_proc(p, req, doingzomb);
539 * This sysctl allows a process to retrieve the argument list or process
540 * title for another process without groping around in the address space
541 * of the other process. It also allow a process to set its own "process
542 * title to a string of its own choice.
545 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
547 int *name = (int*) arg1;
548 u_int namelen = arg2;
552 struct ucred *cr1 = curproc->p_ucred;
557 p = pfind((pid_t)name[0]);
561 if ((!ps_argsopen) && p_trespass(cr1, p->p_ucred))
564 if (req->newptr && curproc != p)
567 if (req->oldptr && p->p_args != NULL)
568 error = SYSCTL_OUT(req, p->p_args->ar_args, p->p_args->ar_length);
569 if (req->newptr == NULL)
572 if (p->p_args && --p->p_args->ar_ref == 0)
573 FREE(p->p_args, M_PARGS);
576 if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
579 MALLOC(pa, struct pargs *, sizeof(struct pargs) + req->newlen,
582 pa->ar_length = req->newlen;
583 error = SYSCTL_IN(req, pa->ar_args, req->newlen);
591 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
593 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
594 0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
596 SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
597 sysctl_kern_proc, "Process table");
599 SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
600 sysctl_kern_proc, "Process table");
602 SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
603 sysctl_kern_proc, "Process table");
605 SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
606 sysctl_kern_proc, "Process table");
608 SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
609 sysctl_kern_proc, "Process table");
611 SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
612 sysctl_kern_proc_args, "Process argument list");