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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().
353 lwkt_gettoken(&proc_token);
354 LIST_FOREACH(p, PIDHASH(pid), p_hash) {
355 if (p->p_pid == pid) {
357 lwkt_reltoken(&proc_token);
361 lwkt_reltoken(&proc_token);
366 * Locate a process by number. The returned process is NOT referenced.
367 * The caller should hold proc_token if the caller wishes a stable result.
376 lwkt_gettoken(&proc_token);
377 LIST_FOREACH(p, PIDHASH(pid), p_hash) {
378 if (p->p_pid == pid) {
379 lwkt_reltoken(&proc_token);
383 lwkt_reltoken(&proc_token);
388 pgref(struct pgrp *pgrp)
390 refcount_acquire(&pgrp->pg_refs);
394 pgrel(struct pgrp *pgrp)
396 if (refcount_release(&pgrp->pg_refs))
401 * Locate a process group by number. The returned process group will be
402 * referenced w/pgref() and must be released with pgrel() (or assigned
403 * somewhere if you wish to keep the reference).
412 lwkt_gettoken(&proc_token);
413 LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash) {
414 if (pgrp->pg_id == pgid) {
415 refcount_acquire(&pgrp->pg_refs);
416 lwkt_reltoken(&proc_token);
420 lwkt_reltoken(&proc_token);
425 * Move p to a new or existing process group (and session)
430 enterpgrp(struct proc *p, pid_t pgid, int mksess)
438 KASSERT(pgrp == NULL || !mksess,
439 ("enterpgrp: setsid into non-empty pgrp"));
440 KASSERT(!SESS_LEADER(p),
441 ("enterpgrp: session leader attempted setpgrp"));
444 pid_t savepid = p->p_pid;
449 KASSERT(p->p_pid == pgid,
450 ("enterpgrp: new pgrp and pid != pgid"));
451 if ((np = pfindn(savepid)) == NULL || np != p) {
455 pgrp = kmalloc(sizeof(struct pgrp), M_PGRP, M_WAITOK);
457 struct session *sess;
462 sess = kmalloc(sizeof(struct session), M_SESSION,
465 sess->s_sid = p->p_pid;
467 sess->s_ttyvp = NULL;
469 bcopy(p->p_session->s_login, sess->s_login,
470 sizeof(sess->s_login));
471 pgrp->pg_session = sess;
472 KASSERT(p == curproc,
473 ("enterpgrp: mksession and p != curproc"));
474 lwkt_gettoken(&p->p_token);
475 p->p_flags &= ~P_CONTROLT;
476 lwkt_reltoken(&p->p_token);
478 pgrp->pg_session = p->p_session;
479 sess_hold(pgrp->pg_session);
482 LIST_INIT(&pgrp->pg_members);
483 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
485 SLIST_INIT(&pgrp->pg_sigiolst);
486 lwkt_token_init(&pgrp->pg_token, "pgrp_token");
487 refcount_init(&pgrp->pg_refs, 1);
488 lockinit(&pgrp->pg_lock, "pgwt", 0, 0);
489 } else if (pgrp == p->p_pgrp) {
492 } /* else pgfind() referenced the pgrp */
495 * Adjust eligibility of affected pgrps to participate in job control.
496 * Increment eligibility counts before decrementing, otherwise we
497 * could reach 0 spuriously during the first call.
499 lwkt_gettoken(&pgrp->pg_token);
500 lwkt_gettoken(&p->p_token);
502 fixjobc(p, p->p_pgrp, 0);
503 while ((opgrp = p->p_pgrp) != NULL) {
505 lwkt_gettoken(&opgrp->pg_token);
506 LIST_REMOVE(p, p_pglist);
508 lwkt_reltoken(&opgrp->pg_token);
512 LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
513 lwkt_reltoken(&p->p_token);
514 lwkt_reltoken(&pgrp->pg_token);
522 * Remove process from process group
527 leavepgrp(struct proc *p)
529 struct pgrp *pg = p->p_pgrp;
531 lwkt_gettoken(&p->p_token);
535 lwkt_gettoken(&pg->pg_token);
536 if (p->p_pgrp == pg) {
538 LIST_REMOVE(p, p_pglist);
541 lwkt_reltoken(&pg->pg_token);
542 lwkt_reltoken(&p->p_token); /* avoid chaining on rel */
545 lwkt_reltoken(&p->p_token);
551 * Delete a process group. Must be called only after the last ref has been
555 pgdelete(struct pgrp *pgrp)
558 * Reset any sigio structures pointing to us as a result of
559 * F_SETOWN with our pgid.
561 funsetownlst(&pgrp->pg_sigiolst);
563 if (pgrp->pg_session->s_ttyp != NULL &&
564 pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
565 pgrp->pg_session->s_ttyp->t_pgrp = NULL;
566 LIST_REMOVE(pgrp, pg_hash);
567 sess_rele(pgrp->pg_session);
572 * Adjust the ref count on a session structure. When the ref count falls to
573 * zero the tty is disassociated from the session and the session structure
574 * is freed. Note that tty assocation is not itself ref-counted.
579 sess_hold(struct session *sp)
581 lwkt_gettoken(&tty_token);
583 lwkt_reltoken(&tty_token);
590 sess_rele(struct session *sp)
594 KKASSERT(sp->s_count > 0);
595 lwkt_gettoken(&tty_token);
596 if (--sp->s_count == 0) {
597 if (sp->s_ttyp && sp->s_ttyp->t_session) {
598 #ifdef TTY_DO_FULL_CLOSE
599 /* FULL CLOSE, see ttyclearsession() */
600 KKASSERT(sp->s_ttyp->t_session == sp);
601 sp->s_ttyp->t_session = NULL;
603 /* HALF CLOSE, see ttyclearsession() */
604 if (sp->s_ttyp->t_session == sp)
605 sp->s_ttyp->t_session = NULL;
608 if ((tp = sp->s_ttyp) != NULL) {
612 kfree(sp, M_SESSION);
614 lwkt_reltoken(&tty_token);
618 * Adjust pgrp jobc counters when specified process changes process group.
619 * We count the number of processes in each process group that "qualify"
620 * the group for terminal job control (those with a parent in a different
621 * process group of the same session). If that count reaches zero, the
622 * process group becomes orphaned. Check both the specified process'
623 * process group and that of its children.
624 * entering == 0 => p is leaving specified group.
625 * entering == 1 => p is entering specified group.
630 fixjobc(struct proc *p, struct pgrp *pgrp, int entering)
632 struct pgrp *hispgrp;
633 struct session *mysession;
637 * Check p's parent to see whether p qualifies its own process
638 * group; if so, adjust count for p's process group.
640 lwkt_gettoken(&p->p_token); /* p_children scan */
641 lwkt_gettoken(&pgrp->pg_token);
643 mysession = pgrp->pg_session;
644 if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
645 hispgrp->pg_session == mysession) {
648 else if (--pgrp->pg_jobc == 0)
653 * Check this process' children to see whether they qualify
654 * their process groups; if so, adjust counts for children's
657 LIST_FOREACH(np, &p->p_children, p_sibling) {
659 lwkt_gettoken(&np->p_token);
660 if ((hispgrp = np->p_pgrp) != pgrp &&
661 hispgrp->pg_session == mysession &&
662 np->p_stat != SZOMB) {
664 lwkt_gettoken(&hispgrp->pg_token);
667 else if (--hispgrp->pg_jobc == 0)
669 lwkt_reltoken(&hispgrp->pg_token);
672 lwkt_reltoken(&np->p_token);
675 KKASSERT(pgrp->pg_refs > 0);
676 lwkt_reltoken(&pgrp->pg_token);
677 lwkt_reltoken(&p->p_token);
681 * A process group has become orphaned;
682 * if there are any stopped processes in the group,
683 * hang-up all process in that group.
685 * The caller must hold pg_token.
688 orphanpg(struct pgrp *pg)
692 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
693 if (p->p_stat == SSTOP) {
694 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
704 * Add a new process to the allproc list and the PID hash. This
705 * also assigns a pid to the new process.
710 proc_add_allproc(struct proc *p)
714 if ((random_offset = randompid) != 0) {
716 random_offset = karc4random() % random_offset;
720 lwkt_gettoken(&proc_token);
721 p->p_pid = proc_getnewpid_locked(random_offset);
722 LIST_INSERT_HEAD(&allproc, p, p_list);
723 LIST_INSERT_HEAD(PIDHASH(p->p_pid), p, p_hash);
724 lwkt_reltoken(&proc_token);
728 * Calculate a new process pid. This function is integrated into
729 * proc_add_allproc() to guarentee that the new pid is not reused before
730 * the new process can be added to the allproc list.
732 * The caller must hold proc_token.
736 proc_getnewpid_locked(int random_offset)
738 static pid_t nextpid;
739 static pid_t pidchecked;
743 * Find an unused process ID. We remember a range of unused IDs
744 * ready to use (from nextpid+1 through pidchecked-1).
746 nextpid = nextpid + 1 + random_offset;
749 * If the process ID prototype has wrapped around,
750 * restart somewhat above 0, as the low-numbered procs
751 * tend to include daemons that don't exit.
753 if (nextpid >= PID_MAX) {
754 nextpid = nextpid % PID_MAX;
759 if (nextpid >= pidchecked) {
762 pidchecked = PID_MAX;
765 * Scan the active and zombie procs to check whether this pid
766 * is in use. Remember the lowest pid that's greater
767 * than nextpid, so we can avoid checking for a while.
769 * NOTE: Processes in the midst of being forked may not
770 * yet have p_pgrp and p_pgrp->pg_session set up
771 * yet, so we have to check for NULL.
773 * Processes being torn down should be interlocked
774 * with proc_token prior to the clearing of their
777 p = LIST_FIRST(&allproc);
779 for (; p != NULL; p = LIST_NEXT(p, p_list)) {
780 while (p->p_pid == nextpid ||
781 (p->p_pgrp && p->p_pgrp->pg_id == nextpid) ||
782 (p->p_pgrp && p->p_session &&
783 p->p_session->s_sid == nextpid)) {
785 if (nextpid >= pidchecked)
788 if (p->p_pid > nextpid && pidchecked > p->p_pid)
789 pidchecked = p->p_pid;
791 p->p_pgrp->pg_id > nextpid &&
792 pidchecked > p->p_pgrp->pg_id) {
793 pidchecked = p->p_pgrp->pg_id;
795 if (p->p_pgrp && p->p_session &&
796 p->p_session->s_sid > nextpid &&
797 pidchecked > p->p_session->s_sid) {
798 pidchecked = p->p_session->s_sid;
803 p = LIST_FIRST(&zombproc);
811 * Called from exit1 to remove a process from the allproc
812 * list and move it to the zombie list.
814 * Caller must hold p->p_token. We are required to wait until p_lock
815 * becomes zero before we can manipulate the list, allowing allproc
816 * scans to guarantee consistency during a list scan.
819 proc_move_allproc_zombie(struct proc *p)
821 lwkt_gettoken(&proc_token);
822 PSTALL(p, "reap1", 0);
823 LIST_REMOVE(p, p_list);
824 LIST_INSERT_HEAD(&zombproc, p, p_list);
825 LIST_REMOVE(p, p_hash);
827 lwkt_reltoken(&proc_token);
832 * This routine is called from kern_wait() and will remove the process
833 * from the zombie list and the sibling list. This routine will block
834 * if someone has a lock on the proces (p_lock).
836 * Caller must hold p->p_token. We are required to wait until p_lock
837 * becomes zero before we can manipulate the list, allowing allproc
838 * scans to guarantee consistency during a list scan.
841 proc_remove_zombie(struct proc *p)
843 lwkt_gettoken(&proc_token);
844 PSTALL(p, "reap2", 0);
845 LIST_REMOVE(p, p_list); /* off zombproc */
846 LIST_REMOVE(p, p_sibling);
848 lwkt_reltoken(&proc_token);
852 * Handle various requirements prior to returning to usermode. Called from
853 * platform trap and system call code.
856 lwpuserret(struct lwp *lp)
858 struct proc *p = lp->lwp_proc;
860 if (lp->lwp_mpflags & LWP_MP_VNLRU) {
861 atomic_clear_int(&lp->lwp_mpflags, LWP_MP_VNLRU);
864 if (lp->lwp_mpflags & LWP_MP_WEXIT) {
865 lwkt_gettoken(&p->p_token);
867 lwkt_reltoken(&p->p_token); /* NOT REACHED */
872 * Kernel threads run from user processes can also accumulate deferred
873 * actions which need to be acted upon. Callers include:
875 * nfsd - Can allocate lots of vnodes
878 lwpkthreaddeferred(void)
880 struct lwp *lp = curthread->td_lwp;
883 if (lp->lwp_mpflags & LWP_MP_VNLRU) {
884 atomic_clear_int(&lp->lwp_mpflags, LWP_MP_VNLRU);
891 * Scan all processes on the allproc list. The process is automatically
892 * held for the callback. A return value of -1 terminates the loop.
894 * The callback is made with the process held and proc_token held.
896 * We limit the scan to the number of processes as-of the start of
897 * the scan so as not to get caught up in an endless loop if new processes
898 * are created more quickly than we can scan the old ones. Add a little
899 * slop to try to catch edge cases since nprocs can race.
904 allproc_scan(int (*callback)(struct proc *, void *), void *data)
908 int limit = nprocs + ncpus;
911 * proc_token protects the allproc list and PHOLD() prevents the
912 * process from being removed from the allproc list or the zombproc
915 lwkt_gettoken(&proc_token);
916 LIST_FOREACH(p, &allproc, p_list) {
918 r = callback(p, data);
925 lwkt_reltoken(&proc_token);
929 * Scan all lwps of processes on the allproc list. The lwp is automatically
930 * held for the callback. A return value of -1 terminates the loop.
932 * The callback is made with the proces and lwp both held, and proc_token held.
937 alllwp_scan(int (*callback)(struct lwp *, void *), void *data)
944 * proc_token protects the allproc list and PHOLD() prevents the
945 * process from being removed from the allproc list or the zombproc
948 lwkt_gettoken(&proc_token);
949 LIST_FOREACH(p, &allproc, p_list) {
951 FOREACH_LWP_IN_PROC(lp, p) {
953 r = callback(lp, data);
960 lwkt_reltoken(&proc_token);
964 * Scan all processes on the zombproc list. The process is automatically
965 * held for the callback. A return value of -1 terminates the loop.
968 * The callback is made with the proces held and proc_token held.
971 zombproc_scan(int (*callback)(struct proc *, void *), void *data)
976 lwkt_gettoken(&proc_token);
977 LIST_FOREACH(p, &zombproc, p_list) {
979 r = callback(p, data);
984 lwkt_reltoken(&proc_token);
994 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
1000 for (i = 0; i <= pgrphash; i++) {
1001 if (!LIST_EMPTY(&pgrphashtbl[i])) {
1002 kprintf("\tindx %d\n", i);
1003 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
1005 "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
1006 (void *)pgrp, (long)pgrp->pg_id,
1007 (void *)pgrp->pg_session,
1008 pgrp->pg_session->s_count,
1009 (void *)LIST_FIRST(&pgrp->pg_members));
1010 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1011 kprintf("\t\tpid %ld addr %p pgrp %p\n",
1012 (long)p->p_pid, (void *)p,
1022 * Locate a process on the zombie list. Return a process or NULL.
1023 * The returned process will be referenced and the caller must release
1026 * No other requirements.
1033 lwkt_gettoken(&proc_token);
1034 LIST_FOREACH(p, &zombproc, p_list) {
1035 if (p->p_pid == pid) {
1037 lwkt_reltoken(&proc_token);
1041 lwkt_reltoken(&proc_token);
1046 * The caller must hold proc_token.
1049 sysctl_out_proc(struct proc *p, struct sysctl_req *req, int flags)
1051 struct kinfo_proc ki;
1053 int skp = 0, had_output = 0;
1056 bzero(&ki, sizeof(ki));
1057 lwkt_gettoken(&p->p_token);
1058 fill_kinfo_proc(p, &ki);
1059 if ((flags & KERN_PROC_FLAG_LWP) == 0)
1062 FOREACH_LWP_IN_PROC(lp, p) {
1064 fill_kinfo_lwp(lp, &ki.kp_lwp);
1066 error = SYSCTL_OUT(req, &ki, sizeof(ki));
1073 lwkt_reltoken(&p->p_token);
1074 /* We need to output at least the proc, even if there is no lwp. */
1075 if (had_output == 0) {
1076 error = SYSCTL_OUT(req, &ki, sizeof(ki));
1082 * The caller must hold proc_token.
1085 sysctl_out_proc_kthread(struct thread *td, struct sysctl_req *req, int flags)
1087 struct kinfo_proc ki;
1090 fill_kinfo_proc_kthread(td, &ki);
1091 error = SYSCTL_OUT(req, &ki, sizeof(ki));
1101 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
1103 int *name = (int*) arg1;
1104 int oid = oidp->oid_number;
1105 u_int namelen = arg2;
1107 struct proclist *plist;
1109 struct thread *marker;
1110 int doingzomb, flags = 0;
1114 struct ucred *cr1 = curproc->p_ucred;
1116 flags = oid & KERN_PROC_FLAGMASK;
1117 oid &= ~KERN_PROC_FLAGMASK;
1119 if ((oid == KERN_PROC_ALL && namelen != 0) ||
1120 (oid != KERN_PROC_ALL && namelen != 1)) {
1125 * proc_token protects the allproc list and PHOLD() prevents the
1126 * process from being removed from the allproc list or the zombproc
1129 lwkt_gettoken(&proc_token);
1130 if (oid == KERN_PROC_PID) {
1131 p = pfindn((pid_t)name[0]);
1134 if (!PRISON_CHECK(cr1, p->p_ucred))
1137 error = sysctl_out_proc(p, req, flags);
1143 /* overestimate by 5 procs */
1144 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
1148 for (doingzomb = 0; doingzomb <= 1; doingzomb++) {
1153 LIST_FOREACH(p, plist, p_list) {
1155 * Show a user only their processes.
1157 if ((!ps_showallprocs) && p_trespass(cr1, p->p_ucred))
1160 * Skip embryonic processes.
1162 if (p->p_stat == SIDL)
1165 * TODO - make more efficient (see notes below).
1169 case KERN_PROC_PGRP:
1170 /* could do this by traversing pgrp */
1171 if (p->p_pgrp == NULL ||
1172 p->p_pgrp->pg_id != (pid_t)name[0])
1177 if ((p->p_flags & P_CONTROLT) == 0 ||
1178 p->p_session == NULL ||
1179 p->p_session->s_ttyp == NULL ||
1180 dev2udev(p->p_session->s_ttyp->t_dev) !=
1186 if (p->p_ucred == NULL ||
1187 p->p_ucred->cr_uid != (uid_t)name[0])
1191 case KERN_PROC_RUID:
1192 if (p->p_ucred == NULL ||
1193 p->p_ucred->cr_ruid != (uid_t)name[0])
1198 if (!PRISON_CHECK(cr1, p->p_ucred))
1201 error = sysctl_out_proc(p, req, flags);
1209 * Iterate over all active cpus and scan their thread list. Start
1210 * with the next logical cpu and end with our original cpu. We
1211 * migrate our own thread to each target cpu in order to safely scan
1212 * its thread list. In the last loop we migrate back to our original
1215 origcpu = mycpu->gd_cpuid;
1216 if (!ps_showallthreads || jailed(cr1))
1219 marker = kmalloc(sizeof(struct thread), M_TEMP, M_WAITOK|M_ZERO);
1220 marker->td_flags = TDF_MARKER;
1223 for (n = 1; n <= ncpus; ++n) {
1227 nid = (origcpu + n) % ncpus;
1228 if ((smp_active_mask & CPUMASK(nid)) == 0)
1230 rgd = globaldata_find(nid);
1231 lwkt_setcpu_self(rgd);
1234 TAILQ_INSERT_TAIL(&rgd->gd_tdallq, marker, td_allq);
1236 while ((td = TAILQ_PREV(marker, lwkt_queue, td_allq)) != NULL) {
1237 TAILQ_REMOVE(&rgd->gd_tdallq, marker, td_allq);
1238 TAILQ_INSERT_BEFORE(td, marker, td_allq);
1239 if (td->td_flags & TDF_MARKER)
1248 case KERN_PROC_PGRP:
1251 case KERN_PROC_RUID:
1254 error = sysctl_out_proc_kthread(td, req,
1263 TAILQ_REMOVE(&rgd->gd_tdallq, marker, td_allq);
1269 kfree(marker, M_TEMP);
1272 lwkt_reltoken(&proc_token);
1277 * This sysctl allows a process to retrieve the argument list or process
1278 * title for another process without groping around in the address space
1279 * of the other process. It also allow a process to set its own "process
1280 * title to a string of its own choice.
1285 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
1287 int *name = (int*) arg1;
1288 u_int namelen = arg2;
1293 struct ucred *cr1 = curproc->p_ucred;
1298 p = pfind((pid_t)name[0]);
1301 lwkt_gettoken(&p->p_token);
1303 if ((!ps_argsopen) && p_trespass(cr1, p->p_ucred))
1306 if (req->newptr && curproc != p) {
1310 if (req->oldptr && (pa = p->p_args) != NULL) {
1311 refcount_acquire(&pa->ar_ref);
1312 error = SYSCTL_OUT(req, pa->ar_args, pa->ar_length);
1313 if (refcount_release(&pa->ar_ref))
1316 if (req->newptr == NULL)
1319 if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit) {
1323 pa = kmalloc(sizeof(struct pargs) + req->newlen, M_PARGS, M_WAITOK);
1324 refcount_init(&pa->ar_ref, 1);
1325 pa->ar_length = req->newlen;
1326 error = SYSCTL_IN(req, pa->ar_args, req->newlen);
1334 * Replace p_args with the new pa. p_args may have previously
1341 KKASSERT(opa->ar_ref > 0);
1342 if (refcount_release(&opa->ar_ref)) {
1343 kfree(opa, M_PARGS);
1349 lwkt_reltoken(&p->p_token);
1356 sysctl_kern_proc_cwd(SYSCTL_HANDLER_ARGS)
1358 int *name = (int*) arg1;
1359 u_int namelen = arg2;
1362 char *fullpath, *freepath;
1363 struct ucred *cr1 = curproc->p_ucred;
1368 p = pfind((pid_t)name[0]);
1371 lwkt_gettoken(&p->p_token);
1374 * If we are not allowed to see other args, we certainly shouldn't
1375 * get the cwd either. Also check the usual trespassing.
1377 if ((!ps_argsopen) && p_trespass(cr1, p->p_ucred))
1380 if (req->oldptr && p->p_fd != NULL && p->p_fd->fd_ncdir.ncp) {
1381 struct nchandle nch;
1383 cache_copy(&p->p_fd->fd_ncdir, &nch);
1384 error = cache_fullpath(p, &nch, NULL,
1385 &fullpath, &freepath, 0);
1389 error = SYSCTL_OUT(req, fullpath, strlen(fullpath) + 1);
1390 kfree(freepath, M_TEMP);
1395 lwkt_reltoken(&p->p_token);
1401 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
1403 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
1404 0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
1406 SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD,
1407 sysctl_kern_proc, "Process table");
1409 SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD,
1410 sysctl_kern_proc, "Process table");
1412 SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD,
1413 sysctl_kern_proc, "Process table");
1415 SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD,
1416 sysctl_kern_proc, "Process table");
1418 SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD,
1419 sysctl_kern_proc, "Process table");
1421 SYSCTL_NODE(_kern_proc, (KERN_PROC_ALL | KERN_PROC_FLAG_LWP), all_lwp, CTLFLAG_RD,
1422 sysctl_kern_proc, "Process table");
1424 SYSCTL_NODE(_kern_proc, (KERN_PROC_PGRP | KERN_PROC_FLAG_LWP), pgrp_lwp, CTLFLAG_RD,
1425 sysctl_kern_proc, "Process table");
1427 SYSCTL_NODE(_kern_proc, (KERN_PROC_TTY | KERN_PROC_FLAG_LWP), tty_lwp, CTLFLAG_RD,
1428 sysctl_kern_proc, "Process table");
1430 SYSCTL_NODE(_kern_proc, (KERN_PROC_UID | KERN_PROC_FLAG_LWP), uid_lwp, CTLFLAG_RD,
1431 sysctl_kern_proc, "Process table");
1433 SYSCTL_NODE(_kern_proc, (KERN_PROC_RUID | KERN_PROC_FLAG_LWP), ruid_lwp, CTLFLAG_RD,
1434 sysctl_kern_proc, "Process table");
1436 SYSCTL_NODE(_kern_proc, (KERN_PROC_PID | KERN_PROC_FLAG_LWP), pid_lwp, CTLFLAG_RD,
1437 sysctl_kern_proc, "Process table");
1439 SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
1440 sysctl_kern_proc_args, "Process argument list");
1442 SYSCTL_NODE(_kern_proc, KERN_PROC_CWD, cwd, CTLFLAG_RD | CTLFLAG_ANYBODY,
1443 sysctl_kern_proc_cwd, "Process argument list");