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8 * modification, are permitted provided that the following conditions
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31 * @(#)kern_proc.c 8.7 (Berkeley) 2/14/95
32 * $FreeBSD: src/sys/kern/kern_proc.c,v 1.63.2.9 2003/05/08 07:47:16 kbyanc Exp $
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/sysctl.h>
39 #include <sys/malloc.h>
41 #include <sys/vnode.h>
43 #include <sys/filedesc.h>
45 #include <sys/dsched.h>
46 #include <sys/signalvar.h>
47 #include <sys/spinlock.h>
51 #include <vm/vm_map.h>
53 #include <machine/smp.h>
55 #include <sys/refcount.h>
56 #include <sys/spinlock2.h>
57 #include <sys/mplock2.h>
59 static MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
60 MALLOC_DEFINE(M_SESSION, "session", "session header");
61 MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
62 MALLOC_DEFINE(M_LWP, "lwp", "lwp structures");
63 MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
65 int ps_showallprocs = 1;
66 static int ps_showallthreads = 1;
67 SYSCTL_INT(_security, OID_AUTO, ps_showallprocs, CTLFLAG_RW,
69 "Unprivileged processes can see processes with different UID/GID");
70 SYSCTL_INT(_security, OID_AUTO, ps_showallthreads, CTLFLAG_RW,
71 &ps_showallthreads, 0,
72 "Unprivileged processes can see kernel threads");
74 static void pgdelete(struct pgrp *);
75 static void orphanpg(struct pgrp *pg);
76 static pid_t proc_getnewpid_locked(int random_offset);
81 struct pidhashhead *pidhashtbl;
83 struct pgrphashhead *pgrphashtbl;
85 struct proclist allproc;
86 struct proclist zombproc;
89 * Random component to nextpid generation. We mix in a random factor to make
90 * it a little harder to predict. We sanity check the modulus value to avoid
91 * doing it in critical paths. Don't let it be too small or we pointlessly
92 * waste randomness entropy, and don't let it be impossibly large. Using a
93 * modulus that is too big causes a LOT more process table scans and slows
94 * down fork processing as the pidchecked caching is defeated.
96 static int randompid = 0;
102 sysctl_kern_randompid(SYSCTL_HANDLER_ARGS)
107 error = sysctl_handle_int(oidp, &pid, 0, req);
108 if (error || !req->newptr)
110 if (pid < 0 || pid > PID_MAX - 100) /* out of range */
112 else if (pid < 2) /* NOP */
114 else if (pid < 100) /* Make it reasonable */
120 SYSCTL_PROC(_kern, OID_AUTO, randompid, CTLTYPE_INT|CTLFLAG_RW,
121 0, 0, sysctl_kern_randompid, "I", "Random PID modulus");
124 * Initialize global process hashing structures.
126 * Called from the low level boot code only.
132 LIST_INIT(&zombproc);
134 pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
135 pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
140 * Process hold/release support functions. These functions must be MPSAFE.
141 * Called via the PHOLD(), PRELE(), and PSTALL() macros.
143 * p->p_lock is a simple hold count with a waiting interlock. No wakeup()
144 * is issued unless someone is actually waiting for the process.
146 * Most holds are short-term, allowing a process scan or other similar
147 * operation to access a proc structure without it getting ripped out from
148 * under us. procfs and process-list sysctl ops also use the hold function
149 * interlocked with various p_flags to keep the vmspace intact when reading
150 * or writing a user process's address space.
152 * There are two situations where a hold count can be longer. Exiting lwps
153 * hold the process until the lwp is reaped, and the parent will hold the
154 * child during vfork()/exec() sequences while the child is marked P_PPWAIT.
156 * The kernel waits for the hold count to drop to 0 (or 1 in some cases) at
157 * various critical points in the fork/exec and exit paths before proceeding.
159 #define PLOCK_ZOMB 0x20000000
160 #define PLOCK_WAITING 0x40000000
161 #define PLOCK_MASK 0x1FFFFFFF
164 pstall(struct proc *p, const char *wmesg, int count)
172 if ((o & PLOCK_MASK) <= count)
174 n = o | PLOCK_WAITING;
175 tsleep_interlock(&p->p_lock, 0);
178 * If someone is trying to single-step the process during
179 * an exec or an exit they can deadlock us because procfs
180 * sleeps with the process held.
183 if (p->p_flags & P_INEXEC) {
185 } else if (p->p_flags & P_POSTEXIT) {
186 spin_lock(&p->p_spin);
189 spin_unlock(&p->p_spin);
194 if (atomic_cmpset_int(&p->p_lock, o, n)) {
195 tsleep(&p->p_lock, PINTERLOCKED, wmesg, 0);
201 phold(struct proc *p)
203 atomic_add_int(&p->p_lock, 1);
207 * WARNING! On last release (p) can become instantly invalid due to
211 prele(struct proc *p)
219 if (atomic_cmpset_int(&p->p_lock, 1, 0))
227 KKASSERT((o & PLOCK_MASK) > 0);
229 n = (o - 1) & ~PLOCK_WAITING;
230 if (atomic_cmpset_int(&p->p_lock, o, n)) {
231 if (o & PLOCK_WAITING)
239 * Hold and flag serialized for zombie reaping purposes.
241 * This function will fail if it has to block, returning non-zero with
242 * neither the flag set or the hold count bumped. Note that we must block
243 * without holding a ref, meaning that the caller must ensure that (p)
244 * remains valid through some other interlock (typically on its parent
245 * process's p_token).
247 * Zero is returned on success. The hold count will be incremented and
248 * the serialization flag acquired. Note that serialization is only against
249 * other pholdzomb() calls, not against phold() calls.
252 pholdzomb(struct proc *p)
260 if (atomic_cmpset_int(&p->p_lock, 0, PLOCK_ZOMB | 1))
269 if ((o & PLOCK_ZOMB) == 0) {
270 n = (o + 1) | PLOCK_ZOMB;
271 if (atomic_cmpset_int(&p->p_lock, o, n))
274 KKASSERT((o & PLOCK_MASK) > 0);
275 n = o | PLOCK_WAITING;
276 tsleep_interlock(&p->p_lock, 0);
277 if (atomic_cmpset_int(&p->p_lock, o, n)) {
278 tsleep(&p->p_lock, PINTERLOCKED, "phldz", 0);
279 /* (p) can be ripped out at this point */
287 * Release PLOCK_ZOMB and the hold count, waking up any waiters.
289 * WARNING! On last release (p) can become instantly invalid due to
293 prelezomb(struct proc *p)
301 if (atomic_cmpset_int(&p->p_lock, PLOCK_ZOMB | 1, 0))
307 KKASSERT(p->p_lock & PLOCK_ZOMB);
310 KKASSERT((o & PLOCK_MASK) > 0);
312 n = (o - 1) & ~(PLOCK_ZOMB | PLOCK_WAITING);
313 if (atomic_cmpset_int(&p->p_lock, o, n)) {
314 if (o & PLOCK_WAITING)
322 * Is p an inferior of the current process?
325 * The caller must hold proc_token if the caller wishes a stable result.
328 inferior(struct proc *p)
330 lwkt_gettoken(&proc_token);
331 while (p != curproc) {
333 lwkt_reltoken(&proc_token);
338 lwkt_reltoken(&proc_token);
343 * Locate a process by number. The returned process will be referenced and
344 * must be released with PRELE().
351 struct proc *p = curproc;
354 * Shortcut the current process
356 if (p && p->p_pid == pid) {
362 * Otherwise find it in the hash table.
364 lwkt_gettoken(&proc_token);
365 LIST_FOREACH(p, PIDHASH(pid), p_hash) {
366 if (p->p_pid == pid) {
368 lwkt_reltoken(&proc_token);
372 lwkt_reltoken(&proc_token);
378 * Locate a process by number. The returned process is NOT referenced.
379 * The caller should hold proc_token if the caller wishes a stable result.
388 lwkt_gettoken(&proc_token);
389 LIST_FOREACH(p, PIDHASH(pid), p_hash) {
390 if (p->p_pid == pid) {
391 lwkt_reltoken(&proc_token);
395 lwkt_reltoken(&proc_token);
400 pgref(struct pgrp *pgrp)
402 refcount_acquire(&pgrp->pg_refs);
406 pgrel(struct pgrp *pgrp)
408 if (refcount_release(&pgrp->pg_refs))
413 * Locate a process group by number. The returned process group will be
414 * referenced w/pgref() and must be released with pgrel() (or assigned
415 * somewhere if you wish to keep the reference).
424 lwkt_gettoken(&proc_token);
425 LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash) {
426 if (pgrp->pg_id == pgid) {
427 refcount_acquire(&pgrp->pg_refs);
428 lwkt_reltoken(&proc_token);
432 lwkt_reltoken(&proc_token);
437 * Move p to a new or existing process group (and session)
442 enterpgrp(struct proc *p, pid_t pgid, int mksess)
450 KASSERT(pgrp == NULL || !mksess,
451 ("enterpgrp: setsid into non-empty pgrp"));
452 KASSERT(!SESS_LEADER(p),
453 ("enterpgrp: session leader attempted setpgrp"));
456 pid_t savepid = p->p_pid;
461 KASSERT(p->p_pid == pgid,
462 ("enterpgrp: new pgrp and pid != pgid"));
463 if ((np = pfindn(savepid)) == NULL || np != p) {
467 pgrp = kmalloc(sizeof(struct pgrp), M_PGRP, M_WAITOK);
469 struct session *sess;
474 sess = kmalloc(sizeof(struct session), M_SESSION,
477 sess->s_sid = p->p_pid;
479 sess->s_ttyvp = NULL;
481 bcopy(p->p_session->s_login, sess->s_login,
482 sizeof(sess->s_login));
483 pgrp->pg_session = sess;
484 KASSERT(p == curproc,
485 ("enterpgrp: mksession and p != curproc"));
486 lwkt_gettoken(&p->p_token);
487 p->p_flags &= ~P_CONTROLT;
488 lwkt_reltoken(&p->p_token);
490 pgrp->pg_session = p->p_session;
491 sess_hold(pgrp->pg_session);
494 LIST_INIT(&pgrp->pg_members);
495 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
497 SLIST_INIT(&pgrp->pg_sigiolst);
498 lwkt_token_init(&pgrp->pg_token, "pgrp_token");
499 refcount_init(&pgrp->pg_refs, 1);
500 lockinit(&pgrp->pg_lock, "pgwt", 0, 0);
501 } else if (pgrp == p->p_pgrp) {
504 } /* else pgfind() referenced the pgrp */
507 * Adjust eligibility of affected pgrps to participate in job control.
508 * Increment eligibility counts before decrementing, otherwise we
509 * could reach 0 spuriously during the first call.
511 lwkt_gettoken(&pgrp->pg_token);
512 lwkt_gettoken(&p->p_token);
514 fixjobc(p, p->p_pgrp, 0);
515 while ((opgrp = p->p_pgrp) != NULL) {
517 lwkt_gettoken(&opgrp->pg_token);
518 LIST_REMOVE(p, p_pglist);
520 lwkt_reltoken(&opgrp->pg_token);
524 LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
525 lwkt_reltoken(&p->p_token);
526 lwkt_reltoken(&pgrp->pg_token);
534 * Remove process from process group
539 leavepgrp(struct proc *p)
541 struct pgrp *pg = p->p_pgrp;
543 lwkt_gettoken(&p->p_token);
547 lwkt_gettoken(&pg->pg_token);
548 if (p->p_pgrp == pg) {
550 LIST_REMOVE(p, p_pglist);
553 lwkt_reltoken(&pg->pg_token);
554 lwkt_reltoken(&p->p_token); /* avoid chaining on rel */
557 lwkt_reltoken(&p->p_token);
563 * Delete a process group. Must be called only after the last ref has been
567 pgdelete(struct pgrp *pgrp)
570 * Reset any sigio structures pointing to us as a result of
571 * F_SETOWN with our pgid.
573 funsetownlst(&pgrp->pg_sigiolst);
575 if (pgrp->pg_session->s_ttyp != NULL &&
576 pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
577 pgrp->pg_session->s_ttyp->t_pgrp = NULL;
578 LIST_REMOVE(pgrp, pg_hash);
579 sess_rele(pgrp->pg_session);
584 * Adjust the ref count on a session structure. When the ref count falls to
585 * zero the tty is disassociated from the session and the session structure
586 * is freed. Note that tty assocation is not itself ref-counted.
591 sess_hold(struct session *sp)
593 lwkt_gettoken(&tty_token);
595 lwkt_reltoken(&tty_token);
602 sess_rele(struct session *sp)
606 KKASSERT(sp->s_count > 0);
607 lwkt_gettoken(&tty_token);
608 if (--sp->s_count == 0) {
609 if (sp->s_ttyp && sp->s_ttyp->t_session) {
610 #ifdef TTY_DO_FULL_CLOSE
611 /* FULL CLOSE, see ttyclearsession() */
612 KKASSERT(sp->s_ttyp->t_session == sp);
613 sp->s_ttyp->t_session = NULL;
615 /* HALF CLOSE, see ttyclearsession() */
616 if (sp->s_ttyp->t_session == sp)
617 sp->s_ttyp->t_session = NULL;
620 if ((tp = sp->s_ttyp) != NULL) {
624 kfree(sp, M_SESSION);
626 lwkt_reltoken(&tty_token);
630 * Adjust pgrp jobc counters when specified process changes process group.
631 * We count the number of processes in each process group that "qualify"
632 * the group for terminal job control (those with a parent in a different
633 * process group of the same session). If that count reaches zero, the
634 * process group becomes orphaned. Check both the specified process'
635 * process group and that of its children.
636 * entering == 0 => p is leaving specified group.
637 * entering == 1 => p is entering specified group.
642 fixjobc(struct proc *p, struct pgrp *pgrp, int entering)
644 struct pgrp *hispgrp;
645 struct session *mysession;
649 * Check p's parent to see whether p qualifies its own process
650 * group; if so, adjust count for p's process group.
652 lwkt_gettoken(&p->p_token); /* p_children scan */
653 lwkt_gettoken(&pgrp->pg_token);
655 mysession = pgrp->pg_session;
656 if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
657 hispgrp->pg_session == mysession) {
660 else if (--pgrp->pg_jobc == 0)
665 * Check this process' children to see whether they qualify
666 * their process groups; if so, adjust counts for children's
669 LIST_FOREACH(np, &p->p_children, p_sibling) {
671 lwkt_gettoken(&np->p_token);
672 if ((hispgrp = np->p_pgrp) != pgrp &&
673 hispgrp->pg_session == mysession &&
674 np->p_stat != SZOMB) {
676 lwkt_gettoken(&hispgrp->pg_token);
679 else if (--hispgrp->pg_jobc == 0)
681 lwkt_reltoken(&hispgrp->pg_token);
684 lwkt_reltoken(&np->p_token);
687 KKASSERT(pgrp->pg_refs > 0);
688 lwkt_reltoken(&pgrp->pg_token);
689 lwkt_reltoken(&p->p_token);
693 * A process group has become orphaned;
694 * if there are any stopped processes in the group,
695 * hang-up all process in that group.
697 * The caller must hold pg_token.
700 orphanpg(struct pgrp *pg)
704 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
705 if (p->p_stat == SSTOP) {
706 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
716 * Add a new process to the allproc list and the PID hash. This
717 * also assigns a pid to the new process.
722 proc_add_allproc(struct proc *p)
726 if ((random_offset = randompid) != 0) {
728 random_offset = karc4random() % random_offset;
732 lwkt_gettoken(&proc_token);
733 p->p_pid = proc_getnewpid_locked(random_offset);
734 LIST_INSERT_HEAD(&allproc, p, p_list);
735 LIST_INSERT_HEAD(PIDHASH(p->p_pid), p, p_hash);
736 lwkt_reltoken(&proc_token);
740 * Calculate a new process pid. This function is integrated into
741 * proc_add_allproc() to guarentee that the new pid is not reused before
742 * the new process can be added to the allproc list.
744 * The caller must hold proc_token.
748 proc_getnewpid_locked(int random_offset)
750 static pid_t nextpid;
751 static pid_t pidchecked;
755 * Find an unused process ID. We remember a range of unused IDs
756 * ready to use (from nextpid+1 through pidchecked-1).
758 nextpid = nextpid + 1 + random_offset;
761 * If the process ID prototype has wrapped around,
762 * restart somewhat above 0, as the low-numbered procs
763 * tend to include daemons that don't exit.
765 if (nextpid >= PID_MAX) {
766 nextpid = nextpid % PID_MAX;
771 if (nextpid >= pidchecked) {
774 pidchecked = PID_MAX;
777 * Scan the active and zombie procs to check whether this pid
778 * is in use. Remember the lowest pid that's greater
779 * than nextpid, so we can avoid checking for a while.
781 * NOTE: Processes in the midst of being forked may not
782 * yet have p_pgrp and p_pgrp->pg_session set up
783 * yet, so we have to check for NULL.
785 * Processes being torn down should be interlocked
786 * with proc_token prior to the clearing of their
789 p = LIST_FIRST(&allproc);
791 for (; p != NULL; p = LIST_NEXT(p, p_list)) {
792 while (p->p_pid == nextpid ||
793 (p->p_pgrp && p->p_pgrp->pg_id == nextpid) ||
794 (p->p_pgrp && p->p_session &&
795 p->p_session->s_sid == nextpid)) {
797 if (nextpid >= pidchecked)
800 if (p->p_pid > nextpid && pidchecked > p->p_pid)
801 pidchecked = p->p_pid;
803 p->p_pgrp->pg_id > nextpid &&
804 pidchecked > p->p_pgrp->pg_id) {
805 pidchecked = p->p_pgrp->pg_id;
807 if (p->p_pgrp && p->p_session &&
808 p->p_session->s_sid > nextpid &&
809 pidchecked > p->p_session->s_sid) {
810 pidchecked = p->p_session->s_sid;
815 p = LIST_FIRST(&zombproc);
823 * Called from exit1 to remove a process from the allproc
824 * list and move it to the zombie list.
826 * Caller must hold p->p_token. We are required to wait until p_lock
827 * becomes zero before we can manipulate the list, allowing allproc
828 * scans to guarantee consistency during a list scan.
831 proc_move_allproc_zombie(struct proc *p)
833 lwkt_gettoken(&proc_token);
834 PSTALL(p, "reap1", 0);
835 LIST_REMOVE(p, p_list);
836 LIST_INSERT_HEAD(&zombproc, p, p_list);
837 LIST_REMOVE(p, p_hash);
839 lwkt_reltoken(&proc_token);
844 * This routine is called from kern_wait() and will remove the process
845 * from the zombie list and the sibling list. This routine will block
846 * if someone has a lock on the proces (p_lock).
848 * Caller must hold p->p_token. We are required to wait until p_lock
849 * becomes zero before we can manipulate the list, allowing allproc
850 * scans to guarantee consistency during a list scan.
853 proc_remove_zombie(struct proc *p)
855 lwkt_gettoken(&proc_token);
856 PSTALL(p, "reap2", 0);
857 LIST_REMOVE(p, p_list); /* off zombproc */
858 LIST_REMOVE(p, p_sibling);
860 lwkt_reltoken(&proc_token);
864 * Handle various requirements prior to returning to usermode. Called from
865 * platform trap and system call code.
868 lwpuserret(struct lwp *lp)
870 struct proc *p = lp->lwp_proc;
872 if (lp->lwp_mpflags & LWP_MP_VNLRU) {
873 atomic_clear_int(&lp->lwp_mpflags, LWP_MP_VNLRU);
876 if (lp->lwp_mpflags & LWP_MP_WEXIT) {
877 lwkt_gettoken(&p->p_token);
879 lwkt_reltoken(&p->p_token); /* NOT REACHED */
884 * Kernel threads run from user processes can also accumulate deferred
885 * actions which need to be acted upon. Callers include:
887 * nfsd - Can allocate lots of vnodes
890 lwpkthreaddeferred(void)
892 struct lwp *lp = curthread->td_lwp;
895 if (lp->lwp_mpflags & LWP_MP_VNLRU) {
896 atomic_clear_int(&lp->lwp_mpflags, LWP_MP_VNLRU);
903 * Scan all processes on the allproc list. The process is automatically
904 * held for the callback. A return value of -1 terminates the loop.
906 * The callback is made with the process held and proc_token held.
908 * We limit the scan to the number of processes as-of the start of
909 * the scan so as not to get caught up in an endless loop if new processes
910 * are created more quickly than we can scan the old ones. Add a little
911 * slop to try to catch edge cases since nprocs can race.
916 allproc_scan(int (*callback)(struct proc *, void *), void *data)
920 int limit = nprocs + ncpus;
923 * proc_token protects the allproc list and PHOLD() prevents the
924 * process from being removed from the allproc list or the zombproc
927 lwkt_gettoken(&proc_token);
928 LIST_FOREACH(p, &allproc, p_list) {
930 r = callback(p, data);
937 lwkt_reltoken(&proc_token);
941 * Scan all lwps of processes on the allproc list. The lwp is automatically
942 * held for the callback. A return value of -1 terminates the loop.
944 * The callback is made with the proces and lwp both held, and proc_token held.
949 alllwp_scan(int (*callback)(struct lwp *, void *), void *data)
956 * proc_token protects the allproc list and PHOLD() prevents the
957 * process from being removed from the allproc list or the zombproc
960 lwkt_gettoken(&proc_token);
961 LIST_FOREACH(p, &allproc, p_list) {
963 FOREACH_LWP_IN_PROC(lp, p) {
965 r = callback(lp, data);
972 lwkt_reltoken(&proc_token);
976 * Scan all processes on the zombproc list. The process is automatically
977 * held for the callback. A return value of -1 terminates the loop.
980 * The callback is made with the proces held and proc_token held.
983 zombproc_scan(int (*callback)(struct proc *, void *), void *data)
988 lwkt_gettoken(&proc_token);
989 LIST_FOREACH(p, &zombproc, p_list) {
991 r = callback(p, data);
996 lwkt_reltoken(&proc_token);
1001 #include <ddb/ddb.h>
1006 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
1012 for (i = 0; i <= pgrphash; i++) {
1013 if (!LIST_EMPTY(&pgrphashtbl[i])) {
1014 kprintf("\tindx %d\n", i);
1015 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
1017 "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
1018 (void *)pgrp, (long)pgrp->pg_id,
1019 (void *)pgrp->pg_session,
1020 pgrp->pg_session->s_count,
1021 (void *)LIST_FIRST(&pgrp->pg_members));
1022 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1023 kprintf("\t\tpid %ld addr %p pgrp %p\n",
1024 (long)p->p_pid, (void *)p,
1034 * Locate a process on the zombie list. Return a process or NULL.
1035 * The returned process will be referenced and the caller must release
1038 * No other requirements.
1045 lwkt_gettoken(&proc_token);
1046 LIST_FOREACH(p, &zombproc, p_list) {
1047 if (p->p_pid == pid) {
1049 lwkt_reltoken(&proc_token);
1053 lwkt_reltoken(&proc_token);
1058 * The caller must hold proc_token.
1061 sysctl_out_proc(struct proc *p, struct sysctl_req *req, int flags)
1063 struct kinfo_proc ki;
1065 int skp = 0, had_output = 0;
1068 bzero(&ki, sizeof(ki));
1069 lwkt_gettoken(&p->p_token);
1070 fill_kinfo_proc(p, &ki);
1071 if ((flags & KERN_PROC_FLAG_LWP) == 0)
1074 FOREACH_LWP_IN_PROC(lp, p) {
1076 fill_kinfo_lwp(lp, &ki.kp_lwp);
1078 error = SYSCTL_OUT(req, &ki, sizeof(ki));
1085 lwkt_reltoken(&p->p_token);
1086 /* We need to output at least the proc, even if there is no lwp. */
1087 if (had_output == 0) {
1088 error = SYSCTL_OUT(req, &ki, sizeof(ki));
1094 * The caller must hold proc_token.
1097 sysctl_out_proc_kthread(struct thread *td, struct sysctl_req *req, int flags)
1099 struct kinfo_proc ki;
1102 fill_kinfo_proc_kthread(td, &ki);
1103 error = SYSCTL_OUT(req, &ki, sizeof(ki));
1113 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
1115 int *name = (int*) arg1;
1116 int oid = oidp->oid_number;
1117 u_int namelen = arg2;
1119 struct proclist *plist;
1121 struct thread *marker;
1122 int doingzomb, flags = 0;
1126 struct ucred *cr1 = curproc->p_ucred;
1128 flags = oid & KERN_PROC_FLAGMASK;
1129 oid &= ~KERN_PROC_FLAGMASK;
1131 if ((oid == KERN_PROC_ALL && namelen != 0) ||
1132 (oid != KERN_PROC_ALL && namelen != 1)) {
1137 * proc_token protects the allproc list and PHOLD() prevents the
1138 * process from being removed from the allproc list or the zombproc
1141 lwkt_gettoken(&proc_token);
1142 if (oid == KERN_PROC_PID) {
1143 p = pfindn((pid_t)name[0]);
1146 if (!PRISON_CHECK(cr1, p->p_ucred))
1149 error = sysctl_out_proc(p, req, flags);
1155 /* overestimate by 5 procs */
1156 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
1160 for (doingzomb = 0; doingzomb <= 1; doingzomb++) {
1165 LIST_FOREACH(p, plist, p_list) {
1167 * Show a user only their processes.
1169 if ((!ps_showallprocs) && p_trespass(cr1, p->p_ucred))
1172 * Skip embryonic processes.
1174 if (p->p_stat == SIDL)
1177 * TODO - make more efficient (see notes below).
1181 case KERN_PROC_PGRP:
1182 /* could do this by traversing pgrp */
1183 if (p->p_pgrp == NULL ||
1184 p->p_pgrp->pg_id != (pid_t)name[0])
1189 if ((p->p_flags & P_CONTROLT) == 0 ||
1190 p->p_session == NULL ||
1191 p->p_session->s_ttyp == NULL ||
1192 dev2udev(p->p_session->s_ttyp->t_dev) !=
1198 if (p->p_ucred == NULL ||
1199 p->p_ucred->cr_uid != (uid_t)name[0])
1203 case KERN_PROC_RUID:
1204 if (p->p_ucred == NULL ||
1205 p->p_ucred->cr_ruid != (uid_t)name[0])
1210 if (!PRISON_CHECK(cr1, p->p_ucred))
1213 error = sysctl_out_proc(p, req, flags);
1221 * Iterate over all active cpus and scan their thread list. Start
1222 * with the next logical cpu and end with our original cpu. We
1223 * migrate our own thread to each target cpu in order to safely scan
1224 * its thread list. In the last loop we migrate back to our original
1227 origcpu = mycpu->gd_cpuid;
1228 if (!ps_showallthreads || jailed(cr1))
1231 marker = kmalloc(sizeof(struct thread), M_TEMP, M_WAITOK|M_ZERO);
1232 marker->td_flags = TDF_MARKER;
1235 for (n = 1; n <= ncpus; ++n) {
1239 nid = (origcpu + n) % ncpus;
1240 if ((smp_active_mask & CPUMASK(nid)) == 0)
1242 rgd = globaldata_find(nid);
1243 lwkt_setcpu_self(rgd);
1246 TAILQ_INSERT_TAIL(&rgd->gd_tdallq, marker, td_allq);
1248 while ((td = TAILQ_PREV(marker, lwkt_queue, td_allq)) != NULL) {
1249 TAILQ_REMOVE(&rgd->gd_tdallq, marker, td_allq);
1250 TAILQ_INSERT_BEFORE(td, marker, td_allq);
1251 if (td->td_flags & TDF_MARKER)
1260 case KERN_PROC_PGRP:
1263 case KERN_PROC_RUID:
1266 error = sysctl_out_proc_kthread(td, req,
1275 TAILQ_REMOVE(&rgd->gd_tdallq, marker, td_allq);
1281 kfree(marker, M_TEMP);
1284 lwkt_reltoken(&proc_token);
1289 * This sysctl allows a process to retrieve the argument list or process
1290 * title for another process without groping around in the address space
1291 * of the other process. It also allow a process to set its own "process
1292 * title to a string of its own choice.
1297 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
1299 int *name = (int*) arg1;
1300 u_int namelen = arg2;
1305 struct ucred *cr1 = curproc->p_ucred;
1310 p = pfind((pid_t)name[0]);
1313 lwkt_gettoken(&p->p_token);
1315 if ((!ps_argsopen) && p_trespass(cr1, p->p_ucred))
1318 if (req->newptr && curproc != p) {
1322 if (req->oldptr && (pa = p->p_args) != NULL) {
1323 refcount_acquire(&pa->ar_ref);
1324 error = SYSCTL_OUT(req, pa->ar_args, pa->ar_length);
1325 if (refcount_release(&pa->ar_ref))
1328 if (req->newptr == NULL)
1331 if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit) {
1335 pa = kmalloc(sizeof(struct pargs) + req->newlen, M_PARGS, M_WAITOK);
1336 refcount_init(&pa->ar_ref, 1);
1337 pa->ar_length = req->newlen;
1338 error = SYSCTL_IN(req, pa->ar_args, req->newlen);
1346 * Replace p_args with the new pa. p_args may have previously
1353 KKASSERT(opa->ar_ref > 0);
1354 if (refcount_release(&opa->ar_ref)) {
1355 kfree(opa, M_PARGS);
1361 lwkt_reltoken(&p->p_token);
1368 sysctl_kern_proc_cwd(SYSCTL_HANDLER_ARGS)
1370 int *name = (int*) arg1;
1371 u_int namelen = arg2;
1374 char *fullpath, *freepath;
1375 struct ucred *cr1 = curproc->p_ucred;
1380 p = pfind((pid_t)name[0]);
1383 lwkt_gettoken(&p->p_token);
1386 * If we are not allowed to see other args, we certainly shouldn't
1387 * get the cwd either. Also check the usual trespassing.
1389 if ((!ps_argsopen) && p_trespass(cr1, p->p_ucred))
1392 if (req->oldptr && p->p_fd != NULL && p->p_fd->fd_ncdir.ncp) {
1393 struct nchandle nch;
1395 cache_copy(&p->p_fd->fd_ncdir, &nch);
1396 error = cache_fullpath(p, &nch, NULL,
1397 &fullpath, &freepath, 0);
1401 error = SYSCTL_OUT(req, fullpath, strlen(fullpath) + 1);
1402 kfree(freepath, M_TEMP);
1407 lwkt_reltoken(&p->p_token);
1413 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
1415 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
1416 0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
1418 SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
1419 sysctl_kern_proc, "Process table");
1421 SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
1422 sysctl_kern_proc, "Process table");
1424 SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
1425 sysctl_kern_proc, "Process table");
1427 SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
1428 sysctl_kern_proc, "Process table");
1430 SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
1431 sysctl_kern_proc, "Process table");
1433 SYSCTL_NODE(_kern_proc, (KERN_PROC_ALL | KERN_PROC_FLAG_LWP), all_lwp, CTLFLAG_RD,
1434 sysctl_kern_proc, "Process table");
1436 SYSCTL_NODE(_kern_proc, (KERN_PROC_PGRP | KERN_PROC_FLAG_LWP), pgrp_lwp, CTLFLAG_RD,
1437 sysctl_kern_proc, "Process table");
1439 SYSCTL_NODE(_kern_proc, (KERN_PROC_TTY | KERN_PROC_FLAG_LWP), tty_lwp, CTLFLAG_RD,
1440 sysctl_kern_proc, "Process table");
1442 SYSCTL_NODE(_kern_proc, (KERN_PROC_UID | KERN_PROC_FLAG_LWP), uid_lwp, CTLFLAG_RD,
1443 sysctl_kern_proc, "Process table");
1445 SYSCTL_NODE(_kern_proc, (KERN_PROC_RUID | KERN_PROC_FLAG_LWP), ruid_lwp, CTLFLAG_RD,
1446 sysctl_kern_proc, "Process table");
1448 SYSCTL_NODE(_kern_proc, (KERN_PROC_PID | KERN_PROC_FLAG_LWP), pid_lwp, CTLFLAG_RD,
1449 sysctl_kern_proc, "Process table");
1451 SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
1452 sysctl_kern_proc_args, "Process argument list");
1454 SYSCTL_NODE(_kern_proc, KERN_PROC_CWD, cwd, CTLFLAG_RD | CTLFLAG_ANYBODY,
1455 sysctl_kern_proc_cwd, "Process argument list");