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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 1.2 2003/06/17 04:28:41 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;
79 * Initialize global process hashing structures.
87 pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
88 pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
89 proc_zone = zinit("PROC", sizeof (struct proc), 0, 0, 5);
94 * Is p an inferior of the current process?
98 register struct proc *p;
101 for (; p != curproc; p = p->p_pptr)
108 * Locate a process by number
114 register struct proc *p;
116 LIST_FOREACH(p, PIDHASH(pid), p_hash)
123 * Locate a process group by number
129 register struct pgrp *pgrp;
131 LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash)
132 if (pgrp->pg_id == pgid)
138 * Move p to a new or existing process group (and session)
141 enterpgrp(p, pgid, mksess)
142 register struct proc *p;
146 register struct pgrp *pgrp = pgfind(pgid);
148 KASSERT(pgrp == NULL || !mksess,
149 ("enterpgrp: setsid into non-empty pgrp"));
150 KASSERT(!SESS_LEADER(p),
151 ("enterpgrp: session leader attempted setpgrp"));
154 pid_t savepid = p->p_pid;
159 KASSERT(p->p_pid == pgid,
160 ("enterpgrp: new pgrp and pid != pgid"));
161 if ((np = pfind(savepid)) == NULL || np != p)
163 MALLOC(pgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP,
166 register struct session *sess;
171 MALLOC(sess, struct session *, sizeof(struct session),
172 M_SESSION, M_WAITOK);
174 sess->s_sid = p->p_pid;
176 sess->s_ttyvp = NULL;
178 bcopy(p->p_session->s_login, sess->s_login,
179 sizeof(sess->s_login));
180 p->p_flag &= ~P_CONTROLT;
181 pgrp->pg_session = sess;
182 KASSERT(p == curproc,
183 ("enterpgrp: mksession and p != curproc"));
185 pgrp->pg_session = p->p_session;
186 pgrp->pg_session->s_count++;
189 LIST_INIT(&pgrp->pg_members);
190 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
192 SLIST_INIT(&pgrp->pg_sigiolst);
193 } else if (pgrp == p->p_pgrp)
197 * Adjust eligibility of affected pgrps to participate in job control.
198 * Increment eligibility counts before decrementing, otherwise we
199 * could reach 0 spuriously during the first call.
202 fixjobc(p, p->p_pgrp, 0);
204 LIST_REMOVE(p, p_pglist);
205 if (LIST_EMPTY(&p->p_pgrp->pg_members))
208 LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
213 * remove process from process group
217 register struct proc *p;
220 LIST_REMOVE(p, p_pglist);
221 if (LIST_EMPTY(&p->p_pgrp->pg_members))
228 * delete a process group
232 register struct pgrp *pgrp;
236 * Reset any sigio structures pointing to us as a result of
237 * F_SETOWN with our pgid.
239 funsetownlst(&pgrp->pg_sigiolst);
241 if (pgrp->pg_session->s_ttyp != NULL &&
242 pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
243 pgrp->pg_session->s_ttyp->t_pgrp = NULL;
244 LIST_REMOVE(pgrp, pg_hash);
245 if (--pgrp->pg_session->s_count == 0)
246 FREE(pgrp->pg_session, M_SESSION);
251 * Adjust pgrp jobc counters when specified process changes process group.
252 * We count the number of processes in each process group that "qualify"
253 * the group for terminal job control (those with a parent in a different
254 * process group of the same session). If that count reaches zero, the
255 * process group becomes orphaned. Check both the specified process'
256 * process group and that of its children.
257 * entering == 0 => p is leaving specified group.
258 * entering == 1 => p is entering specified group.
261 fixjobc(p, pgrp, entering)
262 register struct proc *p;
263 register struct pgrp *pgrp;
266 register struct pgrp *hispgrp;
267 register struct session *mysession = pgrp->pg_session;
270 * Check p's parent to see whether p qualifies its own process
271 * group; if so, adjust count for p's process group.
273 if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
274 hispgrp->pg_session == mysession) {
277 else if (--pgrp->pg_jobc == 0)
282 * Check this process' children to see whether they qualify
283 * their process groups; if so, adjust counts for children's
286 LIST_FOREACH(p, &p->p_children, p_sibling)
287 if ((hispgrp = p->p_pgrp) != pgrp &&
288 hispgrp->pg_session == mysession &&
289 p->p_stat != SZOMB) {
292 else if (--hispgrp->pg_jobc == 0)
298 * A process group has become orphaned;
299 * if there are any stopped processes in the group,
300 * hang-up all process in that group.
306 register struct proc *p;
308 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
309 if (p->p_stat == SSTOP) {
310 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
323 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
325 register struct pgrp *pgrp;
326 register struct proc *p;
329 for (i = 0; i <= pgrphash; i++) {
330 if (!LIST_EMPTY(&pgrphashtbl[i])) {
331 printf("\tindx %d\n", i);
332 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
334 "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
335 (void *)pgrp, (long)pgrp->pg_id,
336 (void *)pgrp->pg_session,
337 pgrp->pg_session->s_count,
338 (void *)LIST_FIRST(&pgrp->pg_members));
339 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
340 printf("\t\tpid %ld addr %p pgrp %p\n",
341 (long)p->p_pid, (void *)p,
351 * Fill in an eproc structure for the specified process.
355 register struct proc *p;
356 register struct eproc *ep;
358 register struct tty *tp;
360 bzero(ep, sizeof(*ep));
364 ep->e_pcred = *p->p_cred;
366 ep->e_ucred = *p->p_ucred;
369 ep->e_procsig = *p->p_procsig;
371 if (p->p_stat != SIDL && p->p_stat != SZOMB && p->p_vmspace != NULL) {
372 register struct vmspace *vm = p->p_vmspace;
374 ep->e_vm.vm_rssize = vmspace_resident_count(vm); /*XXX*/
376 if ((p->p_flag & P_INMEM) && p->p_stats)
377 ep->e_stats = *p->p_stats;
379 ep->e_ppid = p->p_pptr->p_pid;
381 ep->e_pgid = p->p_pgrp->pg_id;
382 ep->e_jobc = p->p_pgrp->pg_jobc;
383 ep->e_sess = p->p_pgrp->pg_session;
386 bcopy(ep->e_sess->s_login, ep->e_login, sizeof(ep->e_login));
387 if (ep->e_sess->s_ttyvp)
388 ep->e_flag = EPROC_CTTY;
389 if (p->p_session && SESS_LEADER(p))
390 ep->e_flag |= EPROC_SLEADER;
393 if ((p->p_flag & P_CONTROLT) &&
394 (ep->e_sess != NULL) &&
395 ((tp = ep->e_sess->s_ttyp) != NULL)) {
396 ep->e_tdev = dev2udev(tp->t_dev);
397 ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
398 ep->e_tsess = tp->t_session;
402 strncpy(ep->e_wmesg, p->p_wmesg, WMESGLEN);
403 ep->e_wmesg[WMESGLEN] = 0;
412 LIST_FOREACH(p, &zombproc, p_list)
420 sysctl_out_proc(struct proc *p, struct sysctl_req *req, int doingzomb)
424 pid_t pid = p->p_pid;
426 fill_eproc(p, &eproc);
427 error = SYSCTL_OUT(req,(caddr_t)p, sizeof(struct proc));
430 error = SYSCTL_OUT(req,(caddr_t)&eproc, sizeof(eproc));
433 if (!doingzomb && pid && (pfind(pid) != p))
435 if (doingzomb && zpfind(pid) != p)
441 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
443 int *name = (int*) arg1;
444 u_int namelen = arg2;
449 if (oidp->oid_number == KERN_PROC_PID) {
452 p = pfind((pid_t)name[0]);
455 if (!PRISON_CHECK(curproc, p))
457 error = sysctl_out_proc(p, req, 0);
460 if (oidp->oid_number == KERN_PROC_ALL && !namelen)
462 else if (oidp->oid_number != KERN_PROC_ALL && namelen == 1)
468 /* overestimate by 5 procs */
469 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
473 for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
475 p = LIST_FIRST(&allproc);
477 p = LIST_FIRST(&zombproc);
478 for (; p != 0; p = LIST_NEXT(p, p_list)) {
480 * Show a user only their processes.
482 if ((!ps_showallprocs) && p_trespass(curproc, p))
485 * Skip embryonic processes.
487 if (p->p_stat == SIDL)
490 * TODO - make more efficient (see notes below).
493 switch (oidp->oid_number) {
496 /* could do this by traversing pgrp */
497 if (p->p_pgrp == NULL ||
498 p->p_pgrp->pg_id != (pid_t)name[0])
503 if ((p->p_flag & P_CONTROLT) == 0 ||
504 p->p_session == NULL ||
505 p->p_session->s_ttyp == NULL ||
506 dev2udev(p->p_session->s_ttyp->t_dev) !=
512 if (p->p_ucred == NULL ||
513 p->p_ucred->cr_uid != (uid_t)name[0])
518 if (p->p_ucred == NULL ||
519 p->p_cred->p_ruid != (uid_t)name[0])
524 if (!PRISON_CHECK(curproc, p))
527 error = sysctl_out_proc(p, req, doingzomb);
536 * This sysctl allows a process to retrieve the argument list or process
537 * title for another process without groping around in the address space
538 * of the other process. It also allow a process to set its own "process
539 * title to a string of its own choice.
542 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
544 int *name = (int*) arg1;
545 u_int namelen = arg2;
553 p = pfind((pid_t)name[0]);
557 if ((!ps_argsopen) && p_trespass(curproc, p))
560 if (req->newptr && curproc != p)
563 if (req->oldptr && p->p_args != NULL)
564 error = SYSCTL_OUT(req, p->p_args->ar_args, p->p_args->ar_length);
565 if (req->newptr == NULL)
568 if (p->p_args && --p->p_args->ar_ref == 0)
569 FREE(p->p_args, M_PARGS);
572 if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
575 MALLOC(pa, struct pargs *, sizeof(struct pargs) + req->newlen,
578 pa->ar_length = req->newlen;
579 error = SYSCTL_IN(req, pa->ar_args, req->newlen);
587 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
589 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
590 0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
592 SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
593 sysctl_kern_proc, "Process table");
595 SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
596 sysctl_kern_proc, "Process table");
598 SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
599 sysctl_kern_proc, "Process table");
601 SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
602 sysctl_kern_proc, "Process table");
604 SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
605 sysctl_kern_proc, "Process table");
607 SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
608 sysctl_kern_proc_args, "Process argument list");