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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 $
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/sysctl.h>
41 #include <sys/malloc.h>
43 #include <sys/filedesc.h>
45 #include <sys/signalvar.h>
49 #include <vm/vm_map.h>
51 #include <vm/vm_zone.h>
53 static MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
54 MALLOC_DEFINE(M_SESSION, "session", "session header");
55 static MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
56 MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
58 static int ps_showallprocs = 1;
59 SYSCTL_INT(_kern, OID_AUTO, ps_showallprocs, CTLFLAG_RW,
60 &ps_showallprocs, 0, "");
62 static void pgdelete __P((struct pgrp *));
64 static void orphanpg __P((struct pgrp *pg));
69 struct pidhashhead *pidhashtbl;
71 struct pgrphashhead *pgrphashtbl;
73 struct proclist allproc;
74 struct proclist zombproc;
78 * Initialize global process hashing structures.
86 pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
87 pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
88 proc_zone = zinit("PROC", sizeof (struct proc), 0, 0, 5);
93 * Is p an inferior of the current process?
97 register struct proc *p;
100 for (; p != curproc; p = p->p_pptr)
107 * Locate a process by number
113 register struct proc *p;
115 LIST_FOREACH(p, PIDHASH(pid), p_hash)
122 * Locate a process group by number
128 register struct pgrp *pgrp;
130 LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash)
131 if (pgrp->pg_id == pgid)
137 * Move p to a new or existing process group (and session)
140 enterpgrp(p, pgid, mksess)
141 register struct proc *p;
145 register struct pgrp *pgrp = pgfind(pgid);
147 KASSERT(pgrp == NULL || !mksess,
148 ("enterpgrp: setsid into non-empty pgrp"));
149 KASSERT(!SESS_LEADER(p),
150 ("enterpgrp: session leader attempted setpgrp"));
153 pid_t savepid = p->p_pid;
158 KASSERT(p->p_pid == pgid,
159 ("enterpgrp: new pgrp and pid != pgid"));
160 if ((np = pfind(savepid)) == NULL || np != p)
162 MALLOC(pgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP,
165 register struct session *sess;
170 MALLOC(sess, struct session *, sizeof(struct session),
171 M_SESSION, M_WAITOK);
173 sess->s_sid = p->p_pid;
175 sess->s_ttyvp = NULL;
177 bcopy(p->p_session->s_login, sess->s_login,
178 sizeof(sess->s_login));
179 p->p_flag &= ~P_CONTROLT;
180 pgrp->pg_session = sess;
181 KASSERT(p == curproc,
182 ("enterpgrp: mksession and p != curproc"));
184 pgrp->pg_session = p->p_session;
185 pgrp->pg_session->s_count++;
188 LIST_INIT(&pgrp->pg_members);
189 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
191 SLIST_INIT(&pgrp->pg_sigiolst);
192 } else if (pgrp == p->p_pgrp)
196 * Adjust eligibility of affected pgrps to participate in job control.
197 * Increment eligibility counts before decrementing, otherwise we
198 * could reach 0 spuriously during the first call.
201 fixjobc(p, p->p_pgrp, 0);
203 LIST_REMOVE(p, p_pglist);
204 if (LIST_EMPTY(&p->p_pgrp->pg_members))
207 LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
212 * remove process from process group
216 register struct proc *p;
219 LIST_REMOVE(p, p_pglist);
220 if (LIST_EMPTY(&p->p_pgrp->pg_members))
227 * delete a process group
231 register 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 if (--pgrp->pg_session->s_count == 0)
245 FREE(pgrp->pg_session, M_SESSION);
250 * Adjust pgrp jobc counters when specified process changes process group.
251 * We count the number of processes in each process group that "qualify"
252 * the group for terminal job control (those with a parent in a different
253 * process group of the same session). If that count reaches zero, the
254 * process group becomes orphaned. Check both the specified process'
255 * process group and that of its children.
256 * entering == 0 => p is leaving specified group.
257 * entering == 1 => p is entering specified group.
260 fixjobc(p, pgrp, entering)
261 register struct proc *p;
262 register struct pgrp *pgrp;
265 register struct pgrp *hispgrp;
266 register struct session *mysession = pgrp->pg_session;
269 * Check p's parent to see whether p qualifies its own process
270 * group; if so, adjust count for p's process group.
272 if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
273 hispgrp->pg_session == mysession) {
276 else if (--pgrp->pg_jobc == 0)
281 * Check this process' children to see whether they qualify
282 * their process groups; if so, adjust counts for children's
285 LIST_FOREACH(p, &p->p_children, p_sibling)
286 if ((hispgrp = p->p_pgrp) != pgrp &&
287 hispgrp->pg_session == mysession &&
288 p->p_stat != SZOMB) {
291 else if (--hispgrp->pg_jobc == 0)
297 * A process group has become orphaned;
298 * if there are any stopped processes in the group,
299 * hang-up all process in that group.
305 register struct proc *p;
307 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
308 if (p->p_stat == SSTOP) {
309 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
322 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
324 register struct pgrp *pgrp;
325 register struct proc *p;
328 for (i = 0; i <= pgrphash; i++) {
329 if (!LIST_EMPTY(&pgrphashtbl[i])) {
330 printf("\tindx %d\n", i);
331 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
333 "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
334 (void *)pgrp, (long)pgrp->pg_id,
335 (void *)pgrp->pg_session,
336 pgrp->pg_session->s_count,
337 (void *)LIST_FIRST(&pgrp->pg_members));
338 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
339 printf("\t\tpid %ld addr %p pgrp %p\n",
340 (long)p->p_pid, (void *)p,
350 * Fill in an eproc structure for the specified process.
354 register struct proc *p;
355 register struct eproc *ep;
357 register struct tty *tp;
359 bzero(ep, sizeof(*ep));
363 ep->e_pcred = *p->p_cred;
365 ep->e_ucred = *p->p_ucred;
368 ep->e_procsig = *p->p_procsig;
370 if (p->p_stat != SIDL && p->p_stat != SZOMB && p->p_vmspace != NULL) {
371 register struct vmspace *vm = p->p_vmspace;
373 ep->e_vm.vm_rssize = vmspace_resident_count(vm); /*XXX*/
375 if ((p->p_flag & P_INMEM) && p->p_stats)
376 ep->e_stats = *p->p_stats;
378 ep->e_ppid = p->p_pptr->p_pid;
380 ep->e_pgid = p->p_pgrp->pg_id;
381 ep->e_jobc = p->p_pgrp->pg_jobc;
382 ep->e_sess = p->p_pgrp->pg_session;
385 bcopy(ep->e_sess->s_login, ep->e_login, sizeof(ep->e_login));
386 if (ep->e_sess->s_ttyvp)
387 ep->e_flag = EPROC_CTTY;
388 if (p->p_session && SESS_LEADER(p))
389 ep->e_flag |= EPROC_SLEADER;
392 if ((p->p_flag & P_CONTROLT) &&
393 (ep->e_sess != NULL) &&
394 ((tp = ep->e_sess->s_ttyp) != NULL)) {
395 ep->e_tdev = dev2udev(tp->t_dev);
396 ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
397 ep->e_tsess = tp->t_session;
401 strncpy(ep->e_wmesg, p->p_wmesg, WMESGLEN);
402 ep->e_wmesg[WMESGLEN] = 0;
411 LIST_FOREACH(p, &zombproc, p_list)
419 sysctl_out_proc(struct proc *p, struct sysctl_req *req, int doingzomb)
423 pid_t pid = p->p_pid;
425 fill_eproc(p, &eproc);
426 error = SYSCTL_OUT(req,(caddr_t)p, sizeof(struct proc));
429 error = SYSCTL_OUT(req,(caddr_t)&eproc, sizeof(eproc));
432 if (!doingzomb && pid && (pfind(pid) != p))
434 if (doingzomb && zpfind(pid) != p)
440 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
442 int *name = (int*) arg1;
443 u_int namelen = arg2;
448 if (oidp->oid_number == KERN_PROC_PID) {
451 p = pfind((pid_t)name[0]);
454 if (!PRISON_CHECK(curproc, p))
456 error = sysctl_out_proc(p, req, 0);
459 if (oidp->oid_number == KERN_PROC_ALL && !namelen)
461 else if (oidp->oid_number != KERN_PROC_ALL && namelen == 1)
467 /* overestimate by 5 procs */
468 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
472 for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
474 p = LIST_FIRST(&allproc);
476 p = LIST_FIRST(&zombproc);
477 for (; p != 0; p = LIST_NEXT(p, p_list)) {
479 * Show a user only their processes.
481 if ((!ps_showallprocs) && p_trespass(curproc, p))
484 * Skip embryonic processes.
486 if (p->p_stat == SIDL)
489 * TODO - make more efficient (see notes below).
492 switch (oidp->oid_number) {
495 /* could do this by traversing pgrp */
496 if (p->p_pgrp == NULL ||
497 p->p_pgrp->pg_id != (pid_t)name[0])
502 if ((p->p_flag & P_CONTROLT) == 0 ||
503 p->p_session == NULL ||
504 p->p_session->s_ttyp == NULL ||
505 dev2udev(p->p_session->s_ttyp->t_dev) !=
511 if (p->p_ucred == NULL ||
512 p->p_ucred->cr_uid != (uid_t)name[0])
517 if (p->p_ucred == NULL ||
518 p->p_cred->p_ruid != (uid_t)name[0])
523 if (!PRISON_CHECK(curproc, p))
526 error = sysctl_out_proc(p, req, doingzomb);
535 * This sysctl allows a process to retrieve the argument list or process
536 * title for another process without groping around in the address space
537 * of the other process. It also allow a process to set its own "process
538 * title to a string of its own choice.
541 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
543 int *name = (int*) arg1;
544 u_int namelen = arg2;
552 p = pfind((pid_t)name[0]);
556 if ((!ps_argsopen) && p_trespass(curproc, p))
559 if (req->newptr && curproc != p)
562 if (req->oldptr && p->p_args != NULL)
563 error = SYSCTL_OUT(req, p->p_args->ar_args, p->p_args->ar_length);
564 if (req->newptr == NULL)
567 if (p->p_args && --p->p_args->ar_ref == 0)
568 FREE(p->p_args, M_PARGS);
571 if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
574 MALLOC(pa, struct pargs *, sizeof(struct pargs) + req->newlen,
577 pa->ar_length = req->newlen;
578 error = SYSCTL_IN(req, pa->ar_args, req->newlen);
586 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
588 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
589 0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
591 SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
592 sysctl_kern_proc, "Process table");
594 SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
595 sysctl_kern_proc, "Process table");
597 SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
598 sysctl_kern_proc, "Process table");
600 SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
601 sysctl_kern_proc, "Process table");
603 SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
604 sysctl_kern_proc, "Process table");
606 SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
607 sysctl_kern_proc_args, "Process argument list");