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  * $FreeBSD$
   35  */
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/kernel.h>
   40 #include <sys/sysctl.h>
   41 #include <sys/malloc.h>
   42 #include <sys/proc.h>
   43 #include <sys/filedesc.h>
   44 #include <sys/tty.h>
   45 #include <sys/signalvar.h>
   46 #include <vm/vm.h>
   47 #include <sys/lock.h>
   48 #include <vm/pmap.h>
   49 #include <vm/vm_map.h>
   50 #include <sys/user.h>
   51 #include <vm/vm_zone.h>
   52 
   53 static MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
   54 MALLOC_DEFINE(M_SESSION, "session", "session header");
   55 static MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
   56 MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
   57 
   58 static int ps_showallprocs = 1;
   59 SYSCTL_INT(_kern, OID_AUTO, ps_showallprocs, CTLFLAG_RW,
   60     &ps_showallprocs, 0, "");
   61 
   62 static void pgdelete    __P((struct pgrp *));
   63 
   64 static void     orphanpg __P((struct pgrp *pg));
   65 
   66 /*
   67  * Other process lists
   68  */
   69 struct pidhashhead *pidhashtbl;
   70 u_long pidhash;
   71 struct pgrphashhead *pgrphashtbl;
   72 u_long pgrphash;
   73 struct proclist allproc;
   74 struct proclist zombproc;
   75 vm_zone_t proc_zone;
   76 
   77 /*
   78  * Initialize global process hashing structures.
   79  */
   80 void
   81 procinit()
   82 {
   83 
   84         LIST_INIT(&allproc);
   85         LIST_INIT(&zombproc);
   86         pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
   87         pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
   88         proc_zone = zinit("PROC", sizeof (struct proc), 0, 0, 5);
   89         uihashinit();
   90 }
   91 
   92 /*
   93  * Is p an inferior of the current process?
   94  */
   95 int
   96 inferior(p)
   97         register struct proc *p;
   98 {
   99 
  100         for (; p != curproc; p = p->p_pptr)
  101                 if (p->p_pid == 0)
  102                         return (0);
  103         return (1);
  104 }
  105 
  106 /*
  107  * Locate a process by number
  108  */
  109 struct proc *
  110 pfind(pid)
  111         register pid_t pid;
  112 {
  113         register struct proc *p;
  114 
  115         LIST_FOREACH(p, PIDHASH(pid), p_hash)
  116                 if (p->p_pid == pid)
  117                         return (p);
  118         return (NULL);
  119 }
  120 
  121 /*
  122  * Locate a process group by number
  123  */
  124 struct pgrp *
  125 pgfind(pgid)
  126         register pid_t pgid;
  127 {
  128         register struct pgrp *pgrp;
  129 
  130         LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash)
  131                 if (pgrp->pg_id == pgid)
  132                         return (pgrp);
  133         return (NULL);
  134 }
  135 
  136 /*
  137  * Move p to a new or existing process group (and session)
  138  */
  139 int
  140 enterpgrp(p, pgid, mksess)
  141         register struct proc *p;
  142         pid_t pgid;
  143         int mksess;
  144 {
  145         register struct pgrp *pgrp = pgfind(pgid);
  146 
  147         KASSERT(pgrp == NULL || !mksess,
  148             ("enterpgrp: setsid into non-empty pgrp"));
  149         KASSERT(!SESS_LEADER(p),
  150             ("enterpgrp: session leader attempted setpgrp"));
  151 
  152         if (pgrp == NULL) {
  153                 pid_t savepid = p->p_pid;
  154                 struct proc *np;
  155                 /*
  156                  * new process group
  157                  */
  158                 KASSERT(p->p_pid == pgid,
  159                     ("enterpgrp: new pgrp and pid != pgid"));
  160                 if ((np = pfind(savepid)) == NULL || np != p)
  161                         return (ESRCH);
  162                 MALLOC(pgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP,
  163                     M_WAITOK);
  164                 if (mksess) {
  165                         register struct session *sess;
  166 
  167                         /*
  168                          * new session
  169                          */
  170                         MALLOC(sess, struct session *, sizeof(struct session),
  171                             M_SESSION, M_WAITOK);
  172                         sess->s_leader = p;
  173                         sess->s_sid = p->p_pid;
  174                         sess->s_count = 1;
  175                         sess->s_ttyvp = NULL;
  176                         sess->s_ttyp = NULL;
  177                         bcopy(p->p_session->s_login, sess->s_login,
  178                             sizeof(sess->s_login));
  179                         p->p_flag &= ~P_CONTROLT;
  180                         pgrp->pg_session = sess;
  181                         KASSERT(p == curproc,
  182                             ("enterpgrp: mksession and p != curproc"));
  183                 } else {
  184                         pgrp->pg_session = p->p_session;
  185                         pgrp->pg_session->s_count++;
  186                 }
  187                 pgrp->pg_id = pgid;
  188                 LIST_INIT(&pgrp->pg_members);
  189                 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
  190                 pgrp->pg_jobc = 0;
  191                 SLIST_INIT(&pgrp->pg_sigiolst);
  192         } else if (pgrp == p->p_pgrp)
  193                 return (0);
  194 
  195         /*
  196          * Adjust eligibility of affected pgrps to participate in job control.
  197          * Increment eligibility counts before decrementing, otherwise we
  198          * could reach 0 spuriously during the first call.
  199          */
  200         fixjobc(p, pgrp, 1);
  201         fixjobc(p, p->p_pgrp, 0);
  202 
  203         LIST_REMOVE(p, p_pglist);
  204         if (LIST_EMPTY(&p->p_pgrp->pg_members))
  205                 pgdelete(p->p_pgrp);
  206         p->p_pgrp = pgrp;
  207         LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
  208         return (0);
  209 }
  210 
  211 /*
  212  * remove process from process group
  213  */
  214 int
  215 leavepgrp(p)
  216         register struct proc *p;
  217 {
  218 
  219         LIST_REMOVE(p, p_pglist);
  220         if (LIST_EMPTY(&p->p_pgrp->pg_members))
  221                 pgdelete(p->p_pgrp);
  222         p->p_pgrp = 0;
  223         return (0);
  224 }
  225 
  226 /*
  227  * delete a process group
  228  */
  229 static void
  230 pgdelete(pgrp)
  231         register struct pgrp *pgrp;
  232 {
  233 
  234         /*
  235          * Reset any sigio structures pointing to us as a result of
  236          * F_SETOWN with our pgid.
  237          */
  238         funsetownlst(&pgrp->pg_sigiolst);
  239 
  240         if (pgrp->pg_session->s_ttyp != NULL &&
  241             pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
  242                 pgrp->pg_session->s_ttyp->t_pgrp = NULL;
  243         LIST_REMOVE(pgrp, pg_hash);
  244         if (--pgrp->pg_session->s_count == 0)
  245                 FREE(pgrp->pg_session, M_SESSION);
  246         FREE(pgrp, M_PGRP);
  247 }
  248 
  249 /*
  250  * Adjust pgrp jobc counters when specified process changes process group.
  251  * We count the number of processes in each process group that "qualify"
  252  * the group for terminal job control (those with a parent in a different
  253  * process group of the same session).  If that count reaches zero, the
  254  * process group becomes orphaned.  Check both the specified process'
  255  * process group and that of its children.
  256  * entering == 0 => p is leaving specified group.
  257  * entering == 1 => p is entering specified group.
  258  */
  259 void
  260 fixjobc(p, pgrp, entering)
  261         register struct proc *p;
  262         register struct pgrp *pgrp;
  263         int entering;
  264 {
  265         register struct pgrp *hispgrp;
  266         register struct session *mysession = pgrp->pg_session;
  267 
  268         /*
  269          * Check p's parent to see whether p qualifies its own process
  270          * group; if so, adjust count for p's process group.
  271          */
  272         if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
  273             hispgrp->pg_session == mysession) {
  274                 if (entering)
  275                         pgrp->pg_jobc++;
  276                 else if (--pgrp->pg_jobc == 0)
  277                         orphanpg(pgrp);
  278         }
  279 
  280         /*
  281          * Check this process' children to see whether they qualify
  282          * their process groups; if so, adjust counts for children's
  283          * process groups.
  284          */
  285         LIST_FOREACH(p, &p->p_children, p_sibling)
  286                 if ((hispgrp = p->p_pgrp) != pgrp &&
  287                     hispgrp->pg_session == mysession &&
  288                     p->p_stat != SZOMB) {
  289                         if (entering)
  290                                 hispgrp->pg_jobc++;
  291                         else if (--hispgrp->pg_jobc == 0)
  292                                 orphanpg(hispgrp);
  293                 }
  294 }
  295 
  296 /*
  297  * A process group has become orphaned;
  298  * if there are any stopped processes in the group,
  299  * hang-up all process in that group.
  300  */
  301 static void
  302 orphanpg(pg)
  303         struct pgrp *pg;
  304 {
  305         register struct proc *p;
  306 
  307         LIST_FOREACH(p, &pg->pg_members, p_pglist) {
  308                 if (p->p_stat == SSTOP) {
  309                         LIST_FOREACH(p, &pg->pg_members, p_pglist) {
  310                                 psignal(p, SIGHUP);
  311                                 psignal(p, SIGCONT);
  312                         }
  313                         return;
  314                 }
  315         }
  316 }
  317 
  318 #include "opt_ddb.h"
  319 #ifdef DDB
  320 #include <ddb/ddb.h>
  321 
  322 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
  323 {
  324         register struct pgrp *pgrp;
  325         register struct proc *p;
  326         register int i;
  327 
  328         for (i = 0; i <= pgrphash; i++) {
  329                 if (!LIST_EMPTY(&pgrphashtbl[i])) {
  330                         printf("\tindx %d\n", i);
  331                         LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
  332                                 printf(
  333                         "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
  334                                     (void *)pgrp, (long)pgrp->pg_id,
  335                                     (void *)pgrp->pg_session,
  336                                     pgrp->pg_session->s_count,
  337                                     (void *)LIST_FIRST(&pgrp->pg_members));
  338                                 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
  339                                         printf("\t\tpid %ld addr %p pgrp %p\n", 
  340                                             (long)p->p_pid, (void *)p,
  341                                             (void *)p->p_pgrp);
  342                                 }
  343                         }
  344                 }
  345         }
  346 }
  347 #endif /* DDB */
  348 
  349 /*
  350  * Fill in an eproc structure for the specified process.
  351  */
  352 void
  353 fill_eproc(p, ep)
  354         register struct proc *p;
  355         register struct eproc *ep;
  356 {
  357         register struct tty *tp;
  358 
  359         bzero(ep, sizeof(*ep));
  360 
  361         ep->e_paddr = p;
  362         if (p->p_cred) {
  363                 ep->e_pcred = *p->p_cred;
  364                 if (p->p_ucred)
  365                         ep->e_ucred = *p->p_ucred;
  366         }
  367         if (p->p_procsig) {
  368                 ep->e_procsig = *p->p_procsig;
  369         }
  370         if (p->p_stat != SIDL && p->p_stat != SZOMB && p->p_vmspace != NULL) {
  371                 register struct vmspace *vm = p->p_vmspace;
  372                 ep->e_vm = *vm;
  373                 ep->e_vm.vm_rssize = vmspace_resident_count(vm); /*XXX*/
  374         }
  375         if ((p->p_flag & P_INMEM) && p->p_stats)
  376                 ep->e_stats = *p->p_stats;
  377         if (p->p_pptr)
  378                 ep->e_ppid = p->p_pptr->p_pid;
  379         if (p->p_pgrp) {
  380                 ep->e_pgid = p->p_pgrp->pg_id;
  381                 ep->e_jobc = p->p_pgrp->pg_jobc;
  382                 ep->e_sess = p->p_pgrp->pg_session;
  383 
  384                 if (ep->e_sess) {
  385                         bcopy(ep->e_sess->s_login, ep->e_login, sizeof(ep->e_login));
  386                         if (ep->e_sess->s_ttyvp)
  387                                 ep->e_flag = EPROC_CTTY;
  388                         if (p->p_session && SESS_LEADER(p))
  389                                 ep->e_flag |= EPROC_SLEADER;
  390                 }
  391         }
  392         if (ep->e_sess != NULL)
  393                 ep->e_sid = ep->e_sess->s_sid;
  394         if ((p->p_flag & P_CONTROLT) &&
  395             (ep->e_sess != NULL) &&
  396             ((tp = ep->e_sess->s_ttyp) != NULL)) {
  397                 ep->e_tdev = dev2udev(tp->t_dev);
  398                 ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
  399                 ep->e_tsess = tp->t_session;
  400         } else
  401                 ep->e_tdev = NOUDEV;
  402         if (p->p_wmesg) {
  403                 strncpy(ep->e_wmesg, p->p_wmesg, WMESGLEN);
  404                 ep->e_wmesg[WMESGLEN] = 0;
  405         }
  406 }
  407 
  408 struct proc *
  409 zpfind(pid_t pid)
  410 {
  411         struct proc *p;
  412 
  413         LIST_FOREACH(p, &zombproc, p_list)
  414                 if (p->p_pid == pid)
  415                         return (p);
  416         return (NULL);
  417 }
  418 
  419 
  420 static int
  421 sysctl_out_proc(struct proc *p, struct sysctl_req *req, int doingzomb)
  422 {
  423         struct eproc eproc;
  424         int error;
  425         pid_t pid = p->p_pid;
  426 
  427         fill_eproc(p, &eproc);
  428         error = SYSCTL_OUT(req,(caddr_t)p, sizeof(struct proc));
  429         if (error)
  430                 return (error);
  431         error = SYSCTL_OUT(req,(caddr_t)&eproc, sizeof(eproc));
  432         if (error)
  433                 return (error);
  434         if (!doingzomb && pid && (pfind(pid) != p))
  435                 return EAGAIN;
  436         if (doingzomb && zpfind(pid) != p)
  437                 return EAGAIN;
  438         return (0);
  439 }
  440 
  441 static int
  442 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
  443 {
  444         int *name = (int*) arg1;
  445         u_int namelen = arg2;
  446         struct proc *p;
  447         int doingzomb;
  448         int error = 0;
  449 
  450         if (oidp->oid_number == KERN_PROC_PID) {
  451                 if (namelen != 1) 
  452                         return (EINVAL);
  453                 p = pfind((pid_t)name[0]);
  454                 if (!p)
  455                         return (0);
  456                 if (!PRISON_CHECK(curproc, p))
  457                         return (0);
  458                 error = sysctl_out_proc(p, req, 0);
  459                 return (error);
  460         }
  461         if (oidp->oid_number == KERN_PROC_ALL && !namelen)
  462                 ;
  463         else if (oidp->oid_number != KERN_PROC_ALL && namelen == 1)
  464                 ;
  465         else
  466                 return (EINVAL);
  467         
  468         if (!req->oldptr) {
  469                 /* overestimate by 5 procs */
  470                 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
  471                 if (error)
  472                         return (error);
  473         }
  474         for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
  475                 if (!doingzomb)
  476                         p = LIST_FIRST(&allproc);
  477                 else
  478                         p = LIST_FIRST(&zombproc);
  479                 for (; p != 0; p = LIST_NEXT(p, p_list)) {
  480                         /*
  481                          * Show a user only their processes.
  482                          */
  483                         if ((!ps_showallprocs) && p_trespass(curproc, p))
  484                                 continue;
  485                         /*
  486                          * Skip embryonic processes.
  487                          */
  488                         if (p->p_stat == SIDL)
  489                                 continue;
  490                         /*
  491                          * TODO - make more efficient (see notes below).
  492                          * do by session.
  493                          */
  494                         switch (oidp->oid_number) {
  495 
  496                         case KERN_PROC_PGRP:
  497                                 /* could do this by traversing pgrp */
  498                                 if (p->p_pgrp == NULL || 
  499                                     p->p_pgrp->pg_id != (pid_t)name[0])
  500                                         continue;
  501                                 break;
  502 
  503                         case KERN_PROC_TTY:
  504                                 if ((p->p_flag & P_CONTROLT) == 0 ||
  505                                     p->p_session == NULL ||
  506                                     p->p_session->s_ttyp == NULL ||
  507                                     dev2udev(p->p_session->s_ttyp->t_dev) != 
  508                                         (udev_t)name[0])
  509                                         continue;
  510                                 break;
  511 
  512                         case KERN_PROC_UID:
  513                                 if (p->p_ucred == NULL || 
  514                                     p->p_ucred->cr_uid != (uid_t)name[0])
  515                                         continue;
  516                                 break;
  517 
  518                         case KERN_PROC_RUID:
  519                                 if (p->p_ucred == NULL || 
  520                                     p->p_cred->p_ruid != (uid_t)name[0])
  521                                         continue;
  522                                 break;
  523                         }
  524 
  525                         if (!PRISON_CHECK(curproc, p))
  526                                 continue;
  527 
  528                         error = sysctl_out_proc(p, req, doingzomb);
  529                         if (error)
  530                                 return (error);
  531                 }
  532         }
  533         return (0);
  534 }
  535 
  536 /*
  537  * This sysctl allows a process to retrieve the argument list or process
  538  * title for another process without groping around in the address space
  539  * of the other process.  It also allow a process to set its own "process 
  540  * title to a string of its own choice.
  541  */
  542 static int
  543 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
  544 {
  545         int *name = (int*) arg1;
  546         u_int namelen = arg2;
  547         struct proc *p;
  548         struct pargs *pa;
  549         int error = 0;
  550 
  551         if (namelen != 1) 
  552                 return (EINVAL);
  553 
  554         p = pfind((pid_t)name[0]);
  555         if (!p)
  556                 return (0);
  557 
  558         if (!ps_showallprocs && p_trespass(curproc, p))
  559                 return (0);
  560         if (!PRISON_CHECK(curproc, p))
  561                 return (0);
  562         if (!ps_argsopen && p_trespass(curproc, p))
  563                 return (0);
  564  
  565         if (curproc != p && req->newptr != NULL)
  566                 return (EPERM);
  567 
  568         if (req->oldptr && p->p_args != NULL)
  569                 error = SYSCTL_OUT(req, p->p_args->ar_args, p->p_args->ar_length);
  570         if (req->newptr == NULL)
  571                 return (error);
  572 
  573         if (p->p_args && --p->p_args->ar_ref == 0) 
  574                 FREE(p->p_args, M_PARGS);
  575         p->p_args = NULL;
  576 
  577         if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
  578                 return (error);
  579 
  580         MALLOC(pa, struct pargs *, sizeof(struct pargs) + req->newlen, 
  581             M_PARGS, M_WAITOK);
  582         pa->ar_ref = 1;
  583         pa->ar_length = req->newlen;
  584         error = SYSCTL_IN(req, pa->ar_args, req->newlen);
  585         if (!error)
  586                 p->p_args = pa;
  587         else
  588                 FREE(pa, M_PARGS);
  589         return (error);
  590 }
  591 
  592 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD,  0, "Process table");
  593 
  594 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT,
  595         0, 0, sysctl_kern_proc, "S,proc", "Return entire process table");
  596 
  597 SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD, 
  598         sysctl_kern_proc, "Process table");
  599 
  600 SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD, 
  601         sysctl_kern_proc, "Process table");
  602 
  603 SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD, 
  604         sysctl_kern_proc, "Process table");
  605 
  606 SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD, 
  607         sysctl_kern_proc, "Process table");
  608 
  609 SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD, 
  610         sysctl_kern_proc, "Process table");
  611 
  612 SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY,
  613         sysctl_kern_proc_args, "Process argument list");
Cache object: 8953e46dc1d88dadd3882858d6c970f6
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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_proc.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_proc.c
