The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_proc.c

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    1 /*
    2  * Copyright (c) 1982, 1986, 1989, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)kern_proc.c 8.7 (Berkeley) 2/14/95
   34  * $FreeBSD: releng/5.0/sys/kern/kern_proc.c 107137 2002-11-21 09:30:55Z jeff $
   35  */
   36 
   37 #include "opt_ktrace.h"
   38 #include "opt_kstack_pages.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/kernel.h>
   43 #include <sys/lock.h>
   44 #include <sys/malloc.h>
   45 #include <sys/mutex.h>
   46 #include <sys/proc.h>
   47 #include <sys/kse.h>
   48 #include <sys/sched.h>
   49 #include <sys/smp.h>
   50 #include <sys/sysctl.h>
   51 #include <sys/filedesc.h>
   52 #include <sys/tty.h>
   53 #include <sys/signalvar.h>
   54 #include <sys/sx.h>
   55 #include <sys/user.h>
   56 #include <sys/jail.h>
   57 #ifdef KTRACE
   58 #include <sys/uio.h>
   59 #include <sys/ktrace.h>
   60 #endif
   61 
   62 #include <vm/vm.h>
   63 #include <vm/vm_extern.h>
   64 #include <vm/pmap.h>
   65 #include <vm/vm_map.h>
   66 #include <vm/uma.h>
   67 #include <machine/critical.h>
   68 
   69 MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
   70 MALLOC_DEFINE(M_SESSION, "session", "session header");
   71 static MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
   72 MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
   73 
   74 static struct proc *dopfind(register pid_t);
   75 
   76 static void doenterpgrp(struct proc *, struct pgrp *);
   77 
   78 static void pgdelete(struct pgrp *);
   79 
   80 static void orphanpg(struct pgrp *pg);
   81 
   82 static void proc_ctor(void *mem, int size, void *arg);
   83 static void proc_dtor(void *mem, int size, void *arg);
   84 static void proc_init(void *mem, int size);
   85 static void proc_fini(void *mem, int size);
   86 
   87 /*
   88  * Other process lists
   89  */
   90 struct pidhashhead *pidhashtbl;
   91 u_long pidhash;
   92 struct pgrphashhead *pgrphashtbl;
   93 u_long pgrphash;
   94 struct proclist allproc;
   95 struct proclist zombproc;
   96 struct sx allproc_lock;
   97 struct sx proctree_lock;
   98 struct mtx pargs_ref_lock;
   99 struct mtx ppeers_lock;
  100 uma_zone_t proc_zone;
  101 uma_zone_t ithread_zone;
  102 
  103 int kstack_pages = KSTACK_PAGES;
  104 int uarea_pages = UAREA_PAGES;
  105 SYSCTL_INT(_kern, OID_AUTO, kstack_pages, CTLFLAG_RD, &kstack_pages, 0, "");
  106 SYSCTL_INT(_kern, OID_AUTO, uarea_pages, CTLFLAG_RD, &uarea_pages, 0, "");
  107 
  108 #define RANGEOF(type, start, end) (offsetof(type, end) - offsetof(type, start))
  109 
  110 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
  111 
  112 /*
  113  * Initialize global process hashing structures.
  114  */
  115 void
  116 procinit()
  117 {
  118 
  119         sx_init(&allproc_lock, "allproc");
  120         sx_init(&proctree_lock, "proctree");
  121         mtx_init(&pargs_ref_lock, "struct pargs.ref", NULL, MTX_DEF);
  122         mtx_init(&ppeers_lock, "p_peers", NULL, MTX_DEF);
  123         LIST_INIT(&allproc);
  124         LIST_INIT(&zombproc);
  125         pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
  126         pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
  127         proc_zone = uma_zcreate("PROC", sched_sizeof_proc(),
  128             proc_ctor, proc_dtor, proc_init, proc_fini,
  129             UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
  130         uihashinit();
  131 }
  132 
  133 /*
  134  * Prepare a proc for use.
  135  */
  136 static void
  137 proc_ctor(void *mem, int size, void *arg)
  138 {
  139         struct proc *p;
  140 
  141         p = (struct proc *)mem;
  142 }
  143 
  144 /*
  145  * Reclaim a proc after use.
  146  */
  147 static void
  148 proc_dtor(void *mem, int size, void *arg)
  149 {
  150         struct proc *p;
  151         struct thread *td;
  152         struct ksegrp *kg;
  153         struct kse *ke;
  154 
  155         /* INVARIANTS checks go here */
  156         p = (struct proc *)mem;
  157         KASSERT((p->p_numthreads == 1),
  158             ("bad number of threads in exiting process"));
  159         td = FIRST_THREAD_IN_PROC(p);
  160         KASSERT((td != NULL), ("proc_dtor: bad thread pointer"));
  161         kg = FIRST_KSEGRP_IN_PROC(p);
  162         KASSERT((kg != NULL), ("proc_dtor: bad kg pointer"));
  163         ke = FIRST_KSE_IN_KSEGRP(kg);
  164         KASSERT((ke != NULL), ("proc_dtor: bad ke pointer"));
  165 
  166         /* Dispose of an alternate kstack, if it exists.
  167          * XXX What if there are more than one thread in the proc?
  168          *     The first thread in the proc is special and not
  169          *     freed, so you gotta do this here.
  170          */
  171         if (((p->p_flag & P_KTHREAD) != 0) && (td->td_altkstack != 0))
  172                 pmap_dispose_altkstack(td);
  173 
  174         /*
  175          * We want to make sure we know the initial linkages.
  176          * so for now tear them down and remake them.
  177          * This is probably un-needed as we can probably rely
  178          * on the state coming in here from wait4().
  179          */
  180         proc_linkup(p, kg, ke, td);
  181 }
  182 
  183 /*
  184  * Initialize type-stable parts of a proc (when newly created).
  185  */
  186 static void
  187 proc_init(void *mem, int size)
  188 {
  189         struct proc *p;
  190         struct thread *td;
  191         struct ksegrp *kg;
  192         struct kse *ke;
  193 
  194         p = (struct proc *)mem;
  195         p->p_sched = (struct p_sched *)&p[1];
  196         vm_proc_new(p);
  197         td = thread_alloc();
  198         ke = kse_alloc();
  199         kg = ksegrp_alloc();
  200         proc_linkup(p, kg, ke, td);
  201 }
  202 
  203 /*
  204  * Tear down type-stable parts of a proc (just before being discarded)
  205  */
  206 static void
  207 proc_fini(void *mem, int size)
  208 {
  209         struct proc *p;
  210         struct thread *td;
  211         struct ksegrp *kg;
  212         struct kse *ke;
  213 
  214         p = (struct proc *)mem;
  215         KASSERT((p->p_numthreads == 1),
  216             ("bad number of threads in freeing process"));
  217         td = FIRST_THREAD_IN_PROC(p);
  218         KASSERT((td != NULL), ("proc_dtor: bad thread pointer"));
  219         kg = FIRST_KSEGRP_IN_PROC(p);
  220         KASSERT((kg != NULL), ("proc_dtor: bad kg pointer"));
  221         ke = FIRST_KSE_IN_KSEGRP(kg);
  222         KASSERT((ke != NULL), ("proc_dtor: bad ke pointer"));
  223         vm_proc_dispose(p);
  224         thread_free(td);
  225         ksegrp_free(kg);
  226         kse_free(ke);
  227 }
  228 
  229 /*
  230  * Is p an inferior of the current process?
  231  */
  232 int
  233 inferior(p)
  234         register struct proc *p;
  235 {
  236 
  237         sx_assert(&proctree_lock, SX_LOCKED);
  238         for (; p != curproc; p = p->p_pptr)
  239                 if (p->p_pid == 0)
  240                         return (0);
  241         return (1);
  242 }
  243 
  244 /*
  245  * Locate a process by number
  246  */
  247 struct proc *
  248 pfind(pid)
  249         register pid_t pid;
  250 {
  251         register struct proc *p;
  252 
  253         sx_slock(&allproc_lock);
  254         p = dopfind(pid);
  255         sx_sunlock(&allproc_lock);
  256         return (p);
  257 }
  258 
  259 static struct proc *
  260 dopfind(pid)
  261         register pid_t pid;
  262 {
  263         register struct proc *p;
  264 
  265         sx_assert(&allproc_lock, SX_LOCKED);
  266 
  267         LIST_FOREACH(p, PIDHASH(pid), p_hash)
  268                 if (p->p_pid == pid) {
  269                         PROC_LOCK(p);
  270                         break;
  271                 }
  272         return (p);
  273 }
  274 
  275 /*
  276  * Locate a process group by number.
  277  * The caller must hold proctree_lock.
  278  */
  279 struct pgrp *
  280 pgfind(pgid)
  281         register pid_t pgid;
  282 {
  283         register struct pgrp *pgrp;
  284 
  285         sx_assert(&proctree_lock, SX_LOCKED);
  286 
  287         LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash) {
  288                 if (pgrp->pg_id == pgid) {
  289                         PGRP_LOCK(pgrp);
  290                         return (pgrp);
  291                 }
  292         }
  293         return (NULL);
  294 }
  295 
  296 /*
  297  * Create a new process group.
  298  * pgid must be equal to the pid of p.
  299  * Begin a new session if required.
  300  */
  301 int
  302 enterpgrp(p, pgid, pgrp, sess)
  303         register struct proc *p;
  304         pid_t pgid;
  305         struct pgrp *pgrp;
  306         struct session *sess;
  307 {
  308         struct pgrp *pgrp2;
  309 
  310         sx_assert(&proctree_lock, SX_XLOCKED);
  311 
  312         KASSERT(pgrp != NULL, ("enterpgrp: pgrp == NULL"));
  313         KASSERT(p->p_pid == pgid,
  314             ("enterpgrp: new pgrp and pid != pgid"));
  315 
  316         pgrp2 = pgfind(pgid);
  317 
  318         KASSERT(pgrp2 == NULL,
  319             ("enterpgrp: pgrp with pgid exists"));
  320         KASSERT(!SESS_LEADER(p),
  321             ("enterpgrp: session leader attempted setpgrp"));
  322 
  323         mtx_init(&pgrp->pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
  324 
  325         if (sess != NULL) {
  326                 /*
  327                  * new session
  328                  */
  329                 mtx_init(&sess->s_mtx, "session", NULL, MTX_DEF);
  330                 PROC_LOCK(p);
  331                 p->p_flag &= ~P_CONTROLT;
  332                 PROC_UNLOCK(p);
  333                 PGRP_LOCK(pgrp);
  334                 sess->s_leader = p;
  335                 sess->s_sid = p->p_pid;
  336                 sess->s_count = 1;
  337                 sess->s_ttyvp = NULL;
  338                 sess->s_ttyp = NULL;
  339                 bcopy(p->p_session->s_login, sess->s_login,
  340                             sizeof(sess->s_login));
  341                 pgrp->pg_session = sess;
  342                 KASSERT(p == curproc,
  343                     ("enterpgrp: mksession and p != curproc"));
  344         } else {
  345                 pgrp->pg_session = p->p_session;
  346                 SESS_LOCK(pgrp->pg_session);
  347                 pgrp->pg_session->s_count++;
  348                 SESS_UNLOCK(pgrp->pg_session);
  349                 PGRP_LOCK(pgrp);
  350         }
  351         pgrp->pg_id = pgid;
  352         LIST_INIT(&pgrp->pg_members);
  353 
  354         /*
  355          * As we have an exclusive lock of proctree_lock,
  356          * this should not deadlock.
  357          */
  358         LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
  359         pgrp->pg_jobc = 0;
  360         SLIST_INIT(&pgrp->pg_sigiolst);
  361         PGRP_UNLOCK(pgrp);
  362 
  363         doenterpgrp(p, pgrp);
  364 
  365         return (0);
  366 }
  367 
  368 /*
  369  * Move p to an existing process group
  370  */
  371 int
  372 enterthispgrp(p, pgrp)
  373         register struct proc *p;
  374         struct pgrp *pgrp;
  375 {
  376 
  377         sx_assert(&proctree_lock, SX_XLOCKED);
  378         PROC_LOCK_ASSERT(p, MA_NOTOWNED);
  379         PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
  380         PGRP_LOCK_ASSERT(p->p_pgrp, MA_NOTOWNED);
  381         SESS_LOCK_ASSERT(p->p_session, MA_NOTOWNED);
  382         KASSERT(pgrp->pg_session == p->p_session,
  383                 ("%s: pgrp's session %p, p->p_session %p.\n",
  384                 __func__,
  385                 pgrp->pg_session,
  386                 p->p_session));
  387         KASSERT(pgrp != p->p_pgrp,
  388                 ("%s: p belongs to pgrp.", __func__));
  389 
  390         doenterpgrp(p, pgrp);
  391 
  392         return (0);
  393 }
  394 
  395 /*
  396  * Move p to a process group
  397  */
  398 static void
  399 doenterpgrp(p, pgrp)
  400         struct proc *p;
  401         struct pgrp *pgrp;
  402 {
  403         struct pgrp *savepgrp;
  404 
  405         sx_assert(&proctree_lock, SX_XLOCKED);
  406         PROC_LOCK_ASSERT(p, MA_NOTOWNED);
  407         PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
  408         PGRP_LOCK_ASSERT(p->p_pgrp, MA_NOTOWNED);
  409         SESS_LOCK_ASSERT(p->p_session, MA_NOTOWNED);
  410 
  411         savepgrp = p->p_pgrp;
  412 
  413         /*
  414          * Adjust eligibility of affected pgrps to participate in job control.
  415          * Increment eligibility counts before decrementing, otherwise we
  416          * could reach 0 spuriously during the first call.
  417          */
  418         fixjobc(p, pgrp, 1);
  419         fixjobc(p, p->p_pgrp, 0);
  420 
  421         PGRP_LOCK(pgrp);
  422         PGRP_LOCK(savepgrp);
  423         PROC_LOCK(p);
  424         LIST_REMOVE(p, p_pglist);
  425         p->p_pgrp = pgrp;
  426         PROC_UNLOCK(p);
  427         LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
  428         PGRP_UNLOCK(savepgrp);
  429         PGRP_UNLOCK(pgrp);
  430         if (LIST_EMPTY(&savepgrp->pg_members))
  431                 pgdelete(savepgrp);
  432 }
  433 
  434 /*
  435  * remove process from process group
  436  */
  437 int
  438 leavepgrp(p)
  439         register struct proc *p;
  440 {
  441         struct pgrp *savepgrp;
  442 
  443         sx_assert(&proctree_lock, SX_XLOCKED);
  444         savepgrp = p->p_pgrp;
  445         PGRP_LOCK(savepgrp);
  446         PROC_LOCK(p);
  447         LIST_REMOVE(p, p_pglist);
  448         p->p_pgrp = NULL;
  449         PROC_UNLOCK(p);
  450         PGRP_UNLOCK(savepgrp);
  451         if (LIST_EMPTY(&savepgrp->pg_members))
  452                 pgdelete(savepgrp);
  453         return (0);
  454 }
  455 
  456 /*
  457  * delete a process group
  458  */
  459 static void
  460 pgdelete(pgrp)
  461         register struct pgrp *pgrp;
  462 {
  463         struct session *savesess;
  464 
  465         sx_assert(&proctree_lock, SX_XLOCKED);
  466         PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
  467         SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED);
  468 
  469         /*
  470          * Reset any sigio structures pointing to us as a result of
  471          * F_SETOWN with our pgid.
  472          */
  473         funsetownlst(&pgrp->pg_sigiolst);
  474 
  475         PGRP_LOCK(pgrp);
  476         if (pgrp->pg_session->s_ttyp != NULL &&
  477             pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
  478                 pgrp->pg_session->s_ttyp->t_pgrp = NULL;
  479         LIST_REMOVE(pgrp, pg_hash);
  480         savesess = pgrp->pg_session;
  481         SESS_LOCK(savesess);
  482         savesess->s_count--;
  483         SESS_UNLOCK(savesess);
  484         PGRP_UNLOCK(pgrp);
  485         if (savesess->s_count == 0) {
  486                 mtx_destroy(&savesess->s_mtx);
  487                 FREE(pgrp->pg_session, M_SESSION);
  488         }
  489         mtx_destroy(&pgrp->pg_mtx);
  490         FREE(pgrp, M_PGRP);
  491 }
  492 
  493 /*
  494  * Adjust pgrp jobc counters when specified process changes process group.
  495  * We count the number of processes in each process group that "qualify"
  496  * the group for terminal job control (those with a parent in a different
  497  * process group of the same session).  If that count reaches zero, the
  498  * process group becomes orphaned.  Check both the specified process'
  499  * process group and that of its children.
  500  * entering == 0 => p is leaving specified group.
  501  * entering == 1 => p is entering specified group.
  502  */
  503 void
  504 fixjobc(p, pgrp, entering)
  505         register struct proc *p;
  506         register struct pgrp *pgrp;
  507         int entering;
  508 {
  509         register struct pgrp *hispgrp;
  510         register struct session *mysession;
  511 
  512         sx_assert(&proctree_lock, SX_LOCKED);
  513         PROC_LOCK_ASSERT(p, MA_NOTOWNED);
  514         PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
  515         SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED);
  516 
  517         /*
  518          * Check p's parent to see whether p qualifies its own process
  519          * group; if so, adjust count for p's process group.
  520          */
  521         mysession = pgrp->pg_session;
  522         if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
  523             hispgrp->pg_session == mysession) {
  524                 PGRP_LOCK(pgrp);
  525                 if (entering)
  526                         pgrp->pg_jobc++;
  527                 else {
  528                         --pgrp->pg_jobc;
  529                         if (pgrp->pg_jobc == 0)
  530                                 orphanpg(pgrp);
  531                 }
  532                 PGRP_UNLOCK(pgrp);
  533         }
  534 
  535         /*
  536          * Check this process' children to see whether they qualify
  537          * their process groups; if so, adjust counts for children's
  538          * process groups.
  539          */
  540         LIST_FOREACH(p, &p->p_children, p_sibling) {
  541                 if ((hispgrp = p->p_pgrp) != pgrp &&
  542                     hispgrp->pg_session == mysession &&
  543                     p->p_state != PRS_ZOMBIE) {
  544                         PGRP_LOCK(hispgrp);
  545                         if (entering)
  546                                 hispgrp->pg_jobc++;
  547                         else {
  548                                 --hispgrp->pg_jobc;
  549                                 if (hispgrp->pg_jobc == 0)
  550                                         orphanpg(hispgrp);
  551                         }
  552                         PGRP_UNLOCK(hispgrp);
  553                 }
  554         }
  555 }
  556 
  557 /*
  558  * A process group has become orphaned;
  559  * if there are any stopped processes in the group,
  560  * hang-up all process in that group.
  561  */
  562 static void
  563 orphanpg(pg)
  564         struct pgrp *pg;
  565 {
  566         register struct proc *p;
  567 
  568         PGRP_LOCK_ASSERT(pg, MA_OWNED);
  569 
  570         mtx_lock_spin(&sched_lock);
  571         LIST_FOREACH(p, &pg->pg_members, p_pglist) {
  572                 if (P_SHOULDSTOP(p)) {
  573                         mtx_unlock_spin(&sched_lock);
  574                         LIST_FOREACH(p, &pg->pg_members, p_pglist) {
  575                                 PROC_LOCK(p);
  576                                 psignal(p, SIGHUP);
  577                                 psignal(p, SIGCONT);
  578                                 PROC_UNLOCK(p);
  579                         }
  580                         return;
  581                 }
  582         }
  583         mtx_unlock_spin(&sched_lock);
  584 }
  585 
  586 #include "opt_ddb.h"
  587 #ifdef DDB
  588 #include <ddb/ddb.h>
  589 
  590 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
  591 {
  592         register struct pgrp *pgrp;
  593         register struct proc *p;
  594         register int i;
  595 
  596         for (i = 0; i <= pgrphash; i++) {
  597                 if (!LIST_EMPTY(&pgrphashtbl[i])) {
  598                         printf("\tindx %d\n", i);
  599                         LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
  600                                 printf(
  601                         "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
  602                                     (void *)pgrp, (long)pgrp->pg_id,
  603                                     (void *)pgrp->pg_session,
  604                                     pgrp->pg_session->s_count,
  605                                     (void *)LIST_FIRST(&pgrp->pg_members));
  606                                 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
  607                                         printf("\t\tpid %ld addr %p pgrp %p\n", 
  608                                             (long)p->p_pid, (void *)p,
  609                                             (void *)p->p_pgrp);
  610                                 }
  611                         }
  612                 }
  613         }
  614 }
  615 #endif /* DDB */
  616 
  617 /*
  618  * Fill in an kinfo_proc structure for the specified process.
  619  * Must be called with the target process locked.
  620  */
  621 void
  622 fill_kinfo_proc(p, kp)
  623         struct proc *p;
  624         struct kinfo_proc *kp;
  625 {
  626         struct thread *td;
  627         struct kse *ke;
  628         struct ksegrp *kg;
  629         struct tty *tp;
  630         struct session *sp;
  631         struct timeval tv;
  632 
  633         bzero(kp, sizeof(*kp));
  634 
  635         kp->ki_structsize = sizeof(*kp);
  636         kp->ki_paddr = p;
  637         PROC_LOCK_ASSERT(p, MA_OWNED);
  638         kp->ki_addr =/* p->p_addr; */0; /* XXXKSE */
  639         kp->ki_args = p->p_args;
  640         kp->ki_textvp = p->p_textvp;
  641 #ifdef KTRACE
  642         kp->ki_tracep = p->p_tracep;
  643         mtx_lock(&ktrace_mtx);
  644         kp->ki_traceflag = p->p_traceflag;
  645         mtx_unlock(&ktrace_mtx);
  646 #endif
  647         kp->ki_fd = p->p_fd;
  648         kp->ki_vmspace = p->p_vmspace;
  649         if (p->p_ucred) {
  650                 kp->ki_uid = p->p_ucred->cr_uid;
  651                 kp->ki_ruid = p->p_ucred->cr_ruid;
  652                 kp->ki_svuid = p->p_ucred->cr_svuid;
  653                 /* XXX bde doesn't like KI_NGROUPS */
  654                 kp->ki_ngroups = min(p->p_ucred->cr_ngroups, KI_NGROUPS);
  655                 bcopy(p->p_ucred->cr_groups, kp->ki_groups,
  656                     kp->ki_ngroups * sizeof(gid_t));
  657                 kp->ki_rgid = p->p_ucred->cr_rgid;
  658                 kp->ki_svgid = p->p_ucred->cr_svgid;
  659         }
  660         if (p->p_procsig) {
  661                 kp->ki_sigignore = p->p_procsig->ps_sigignore;
  662                 kp->ki_sigcatch = p->p_procsig->ps_sigcatch;
  663         }
  664         mtx_lock_spin(&sched_lock);
  665         if (p->p_state != PRS_NEW &&
  666             p->p_state != PRS_ZOMBIE &&
  667             p->p_vmspace != NULL) {
  668                 struct vmspace *vm = p->p_vmspace;
  669 
  670                 kp->ki_size = vm->vm_map.size;
  671                 kp->ki_rssize = vmspace_resident_count(vm); /*XXX*/
  672                 if (p->p_sflag & PS_INMEM)
  673                         kp->ki_rssize += UAREA_PAGES;
  674                 FOREACH_THREAD_IN_PROC(p, td) /* XXXKSE: thread swapout check */
  675                         kp->ki_rssize += KSTACK_PAGES;
  676                 kp->ki_swrss = vm->vm_swrss;
  677                 kp->ki_tsize = vm->vm_tsize;
  678                 kp->ki_dsize = vm->vm_dsize;
  679                 kp->ki_ssize = vm->vm_ssize;
  680         }
  681         if ((p->p_sflag & PS_INMEM) && p->p_stats) {
  682                 kp->ki_start = p->p_stats->p_start;
  683                 kp->ki_rusage = p->p_stats->p_ru;
  684                 kp->ki_childtime.tv_sec = p->p_stats->p_cru.ru_utime.tv_sec +
  685                     p->p_stats->p_cru.ru_stime.tv_sec;
  686                 kp->ki_childtime.tv_usec = p->p_stats->p_cru.ru_utime.tv_usec +
  687                     p->p_stats->p_cru.ru_stime.tv_usec;
  688         }
  689         if (p->p_state != PRS_ZOMBIE) {
  690                 td = FIRST_THREAD_IN_PROC(p);
  691                 if (td == NULL) {
  692                         /* XXXKSE: This should never happen. */
  693                         printf("fill_kinfo_proc(): pid %d has no threads!\n",
  694                             p->p_pid);
  695                         mtx_unlock_spin(&sched_lock);
  696                         return;
  697                 }
  698                 if (!(p->p_flag & P_KSES)) {
  699                         if (td->td_wmesg != NULL) {
  700                                 strlcpy(kp->ki_wmesg, td->td_wmesg,
  701                                     sizeof(kp->ki_wmesg));
  702                         }
  703                         if (TD_ON_LOCK(td)) {
  704                                 kp->ki_kiflag |= KI_LOCKBLOCK;
  705                                 strlcpy(kp->ki_lockname, td->td_lockname,
  706                                     sizeof(kp->ki_lockname));
  707                         }
  708                 }
  709 
  710                 if (p->p_state == PRS_NORMAL) { /*  XXXKSE very approximate */
  711                         if (TD_ON_RUNQ(td) ||
  712                             TD_CAN_RUN(td) ||
  713                             TD_IS_RUNNING(td)) {
  714                                 kp->ki_stat = SRUN;
  715                         } else if (P_SHOULDSTOP(p)) {
  716                                 kp->ki_stat = SSTOP;
  717                         } else if (TD_IS_SLEEPING(td)) {
  718                                 kp->ki_stat = SSLEEP;
  719                         } else if (TD_ON_LOCK(td)) {
  720                                 kp->ki_stat = SLOCK;
  721                         } else {
  722                                 kp->ki_stat = SWAIT;
  723                         }
  724                 } else {
  725                         kp->ki_stat = SIDL;
  726                 }
  727 
  728                 kp->ki_sflag = p->p_sflag;
  729                 kp->ki_swtime = p->p_swtime;
  730                 kp->ki_pid = p->p_pid;
  731                 /* vvv XXXKSE */
  732                 if (!(p->p_flag & P_KSES)) {
  733                         kg = td->td_ksegrp;
  734                         ke = td->td_kse;
  735                         KASSERT((ke != NULL), ("fill_kinfo_proc: Null KSE"));
  736                         bintime2timeval(&p->p_runtime, &tv);
  737                         kp->ki_runtime =
  738                             tv.tv_sec * (u_int64_t)1000000 + tv.tv_usec;
  739 
  740                         /* things in the KSE GROUP */
  741                         kp->ki_estcpu = kg->kg_estcpu;
  742                         kp->ki_slptime = kg->kg_slptime;
  743                         kp->ki_pri.pri_user = kg->kg_user_pri;
  744                         kp->ki_pri.pri_class = kg->kg_pri_class;
  745                         kp->ki_nice = kg->kg_nice;
  746 
  747                         /* Things in the thread */
  748                         kp->ki_wchan = td->td_wchan;
  749                         kp->ki_pri.pri_level = td->td_priority;
  750                         kp->ki_pri.pri_native = td->td_base_pri;
  751                         kp->ki_lastcpu = td->td_lastcpu;
  752                         kp->ki_tdflags = td->td_flags;
  753                         kp->ki_pcb = td->td_pcb;
  754                         kp->ki_kstack = (void *)td->td_kstack;
  755 
  756                         /* Things in the kse */
  757                         kp->ki_rqindex = ke->ke_rqindex;
  758                         kp->ki_oncpu = ke->ke_oncpu;
  759                         kp->ki_pctcpu = sched_pctcpu(ke);
  760                 } else {
  761                         kp->ki_oncpu = -1;
  762                         kp->ki_lastcpu = -1;
  763                         kp->ki_tdflags = -1;
  764                         /* All the rest are 0 for now */
  765                 }
  766                 /* ^^^ XXXKSE */
  767         } else {
  768                 kp->ki_stat = SZOMB;
  769         }
  770         mtx_unlock_spin(&sched_lock);
  771         sp = NULL;
  772         tp = NULL;
  773         if (p->p_pgrp) {
  774                 kp->ki_pgid = p->p_pgrp->pg_id;
  775                 kp->ki_jobc = p->p_pgrp->pg_jobc;
  776                 sp = p->p_pgrp->pg_session;
  777 
  778                 if (sp != NULL) {
  779                         kp->ki_sid = sp->s_sid;
  780                         SESS_LOCK(sp);
  781                         strlcpy(kp->ki_login, sp->s_login,
  782                             sizeof(kp->ki_login));
  783                         if (sp->s_ttyvp)
  784                                 kp->ki_kiflag |= KI_CTTY;
  785                         if (SESS_LEADER(p))
  786                                 kp->ki_kiflag |= KI_SLEADER;
  787                         tp = sp->s_ttyp;
  788                         SESS_UNLOCK(sp);
  789                 }
  790         }
  791         if ((p->p_flag & P_CONTROLT) && tp != NULL) {
  792                 kp->ki_tdev = dev2udev(tp->t_dev);
  793                 kp->ki_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
  794                 if (tp->t_session)
  795                         kp->ki_tsid = tp->t_session->s_sid;
  796         } else
  797                 kp->ki_tdev = NOUDEV;
  798         if (p->p_comm[0] != '\0') {
  799                 strlcpy(kp->ki_comm, p->p_comm, sizeof(kp->ki_comm));
  800                 strlcpy(kp->ki_ocomm, p->p_comm, sizeof(kp->ki_ocomm));
  801         }
  802         kp->ki_siglist = p->p_siglist;
  803         kp->ki_sigmask = p->p_sigmask;
  804         kp->ki_xstat = p->p_xstat;
  805         kp->ki_acflag = p->p_acflag;
  806         kp->ki_flag = p->p_flag;
  807         /* If jailed(p->p_ucred), emulate the old P_JAILED flag. */
  808         if (jailed(p->p_ucred))
  809                 kp->ki_flag |= P_JAILED;
  810         kp->ki_lock = p->p_lock;
  811         if (p->p_pptr)
  812                 kp->ki_ppid = p->p_pptr->p_pid;
  813 }
  814 
  815 /*
  816  * Locate a zombie process by number
  817  */
  818 struct proc *
  819 zpfind(pid_t pid)
  820 {
  821         struct proc *p;
  822 
  823         sx_slock(&allproc_lock);
  824         LIST_FOREACH(p, &zombproc, p_list)
  825                 if (p->p_pid == pid) {
  826                         PROC_LOCK(p);
  827                         break;
  828                 }
  829         sx_sunlock(&allproc_lock);
  830         return (p);
  831 }
  832 
  833 
  834 /*
  835  * Must be called with the process locked and will return with it unlocked.
  836  */
  837 static int
  838 sysctl_out_proc(struct proc *p, struct sysctl_req *req, int doingzomb)
  839 {
  840         struct kinfo_proc kinfo_proc;
  841         int error;
  842         struct proc *np;
  843         pid_t pid = p->p_pid;
  844 
  845         PROC_LOCK_ASSERT(p, MA_OWNED);
  846         fill_kinfo_proc(p, &kinfo_proc);
  847         PROC_UNLOCK(p);
  848         error = SYSCTL_OUT(req, (caddr_t)&kinfo_proc, sizeof(kinfo_proc));
  849         if (error)
  850                 return (error);
  851         if (doingzomb)
  852                 np = zpfind(pid);
  853         else {
  854                 if (pid == 0)
  855                         return (0);
  856                 np = pfind(pid);
  857         }
  858         if (np == NULL)
  859                 return EAGAIN;
  860         if (np != p) {
  861                 PROC_UNLOCK(np);
  862                 return EAGAIN;
  863         }
  864         PROC_UNLOCK(np);
  865         return (0);
  866 }
  867 
  868 static int
  869 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
  870 {
  871         int *name = (int*) arg1;
  872         u_int namelen = arg2;
  873         struct proc *p;
  874         int doingzomb;
  875         int error = 0;
  876 
  877         if (oidp->oid_number == KERN_PROC_PID) {
  878                 if (namelen != 1) 
  879                         return (EINVAL);
  880                 p = pfind((pid_t)name[0]);
  881                 if (!p)
  882                         return (0);
  883                 if (p_cansee(curthread, p)) {
  884                         PROC_UNLOCK(p);
  885                         return (0);
  886                 }
  887                 error = sysctl_out_proc(p, req, 0);
  888                 return (error);
  889         }
  890         if (oidp->oid_number == KERN_PROC_ALL && !namelen)
  891                 ;
  892         else if (oidp->oid_number != KERN_PROC_ALL && namelen == 1)
  893                 ;
  894         else
  895                 return (EINVAL);
  896         
  897         if (!req->oldptr) {
  898                 /* overestimate by 5 procs */
  899                 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
  900                 if (error)
  901                         return (error);
  902         }
  903         sysctl_wire_old_buffer(req, 0);
  904         sx_slock(&allproc_lock);
  905         for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
  906                 if (!doingzomb)
  907                         p = LIST_FIRST(&allproc);
  908                 else
  909                         p = LIST_FIRST(&zombproc);
  910                 for (; p != 0; p = LIST_NEXT(p, p_list)) {
  911                         PROC_LOCK(p);
  912                         /*
  913                          * Show a user only appropriate processes.
  914                          */
  915                         if (p_cansee(curthread, p)) {
  916                                 PROC_UNLOCK(p);
  917                                 continue;
  918                         }
  919                         /*
  920                          * Skip embryonic processes.
  921                          */
  922                         if (p->p_state == PRS_NEW) {
  923                                 PROC_UNLOCK(p);
  924                                 continue;
  925                         }
  926                         /*
  927                          * TODO - make more efficient (see notes below).
  928                          * do by session.
  929                          */
  930                         switch (oidp->oid_number) {
  931 
  932                         case KERN_PROC_PGRP:
  933                                 /* could do this by traversing pgrp */
  934                                 if (p->p_pgrp == NULL || 
  935                                     p->p_pgrp->pg_id != (pid_t)name[0]) {
  936                                         PROC_UNLOCK(p);
  937                                         continue;
  938                                 }
  939                                 break;
  940 
  941                         case KERN_PROC_TTY:
  942                                 if ((p->p_flag & P_CONTROLT) == 0 ||
  943                                     p->p_session == NULL) {
  944                                         PROC_UNLOCK(p);
  945                                         continue;
  946                                 }
  947                                 SESS_LOCK(p->p_session);
  948                                 if (p->p_session->s_ttyp == NULL ||
  949                                     dev2udev(p->p_session->s_ttyp->t_dev) != 
  950                                     (udev_t)name[0]) {
  951                                         SESS_UNLOCK(p->p_session);
  952                                         PROC_UNLOCK(p);
  953                                         continue;
  954                                 }
  955                                 SESS_UNLOCK(p->p_session);
  956                                 break;
  957 
  958                         case KERN_PROC_UID:
  959                                 if (p->p_ucred == NULL || 
  960                                     p->p_ucred->cr_uid != (uid_t)name[0]) {
  961                                         PROC_UNLOCK(p);
  962                                         continue;
  963                                 }
  964                                 break;
  965 
  966                         case KERN_PROC_RUID:
  967                                 if (p->p_ucred == NULL || 
  968                                     p->p_ucred->cr_ruid != (uid_t)name[0]) {
  969                                         PROC_UNLOCK(p);
  970                                         continue;
  971                                 }
  972                                 break;
  973                         }
  974 
  975                         error = sysctl_out_proc(p, req, doingzomb);
  976                         if (error) {
  977                                 sx_sunlock(&allproc_lock);
  978                                 return (error);
  979                         }
  980                 }
  981         }
  982         sx_sunlock(&allproc_lock);
  983         return (0);
  984 }
  985 
  986 struct pargs *
  987 pargs_alloc(int len)
  988 {
  989         struct pargs *pa;
  990 
  991         MALLOC(pa, struct pargs *, sizeof(struct pargs) + len, M_PARGS,
  992                 M_WAITOK);
  993         pa->ar_ref = 1;
  994         pa->ar_length = len;
  995         return (pa);
  996 }
  997 
  998 void
  999 pargs_free(struct pargs *pa)
 1000 {
 1001 
 1002         FREE(pa, M_PARGS);
 1003 }
 1004 
 1005 void
 1006 pargs_hold(struct pargs *pa)
 1007 {
 1008 
 1009         if (pa == NULL)
 1010                 return;
 1011         PARGS_LOCK(pa);
 1012         pa->ar_ref++;
 1013         PARGS_UNLOCK(pa);
 1014 }
 1015 
 1016 void
 1017 pargs_drop(struct pargs *pa)
 1018 {
 1019 
 1020         if (pa == NULL)
 1021                 return;
 1022         PARGS_LOCK(pa);
 1023         if (--pa->ar_ref == 0) {
 1024                 PARGS_UNLOCK(pa);
 1025                 pargs_free(pa);
 1026         } else
 1027                 PARGS_UNLOCK(pa);
 1028 }
 1029 
 1030 /*
 1031  * This sysctl allows a process to retrieve the argument list or process
 1032  * title for another process without groping around in the address space
 1033  * of the other process.  It also allow a process to set its own "process 
 1034  * title to a string of its own choice.
 1035  */
 1036 static int
 1037 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
 1038 {
 1039         int *name = (int*) arg1;
 1040         u_int namelen = arg2;
 1041         struct proc *p;
 1042         struct pargs *pa;
 1043         int error = 0;
 1044 
 1045         if (namelen != 1) 
 1046                 return (EINVAL);
 1047 
 1048         p = pfind((pid_t)name[0]);
 1049         if (!p)
 1050                 return (0);
 1051 
 1052         if ((!ps_argsopen) && p_cansee(curthread, p)) {
 1053                 PROC_UNLOCK(p);
 1054                 return (0);
 1055         }
 1056         PROC_UNLOCK(p);
 1057 
 1058         if (req->newptr && curproc != p)
 1059                 return (EPERM);
 1060 
 1061         PROC_LOCK(p);
 1062         pa = p->p_args;
 1063         pargs_hold(pa);
 1064         PROC_UNLOCK(p);
 1065         if (req->oldptr && pa != NULL) {
 1066                 error = SYSCTL_OUT(req, pa->ar_args, pa->ar_length);
 1067         }
 1068         pargs_drop(pa);
 1069         if (req->newptr == NULL)
 1070                 return (error);
 1071 
 1072         PROC_LOCK(p);
 1073         pa = p->p_args;
 1074         p->p_args = NULL;
 1075         PROC_UNLOCK(p);
 1076         pargs_drop(pa);
 1077 
 1078         if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
 1079                 return (error);
 1080 
 1081         pa = pargs_alloc(req->newlen);
 1082         error = SYSCTL_IN(req, pa->ar_args, req->newlen);
 1083         if (!error) {
 1084                 PROC_LOCK(p);
 1085                 p->p_args = pa;
 1086                 PROC_UNLOCK(p);
 1087         } else
 1088                 pargs_free(pa);
 1089         return (error);
 1090 }
 1091 
 1092 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD,  0, "Process table");
 1093 
 1094 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
 1095         0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
 1096 
 1097 SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD, 
 1098         sysctl_kern_proc, "Process table");
 1099 
 1100 SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD, 
 1101         sysctl_kern_proc, "Process table");
 1102 
 1103 SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD, 
 1104         sysctl_kern_proc, "Process table");
 1105 
 1106 SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD, 
 1107         sysctl_kern_proc, "Process table");
 1108 
 1109 SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD, 
 1110         sysctl_kern_proc, "Process table");
 1111 
 1112 SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
 1113         sysctl_kern_proc_args, "Process argument list");
 1114 

Cache object: 4d0d018a4d2bed53bb38b25f1bb18381


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