/* * Copyright (c) 1982, 1986, 1989, 1991, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)kern_proc.c 8.7 (Berkeley) 2/14/95 * $FreeBSD$ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static MALLOC_DEFINE(M_PGRP, "pgrp", "process group header"); MALLOC_DEFINE(M_SESSION, "session", "session header"); static MALLOC_DEFINE(M_PROC, "proc", "Proc structures"); MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures"); int ps_showallprocs = 1; SYSCTL_INT(_kern, OID_AUTO, ps_showallprocs, CTLFLAG_RW, &ps_showallprocs, 0, ""); static void pgdelete __P((struct pgrp *)); static void orphanpg __P((struct pgrp *pg)); /* * Other process lists */ struct pidhashhead *pidhashtbl; u_long pidhash; struct pgrphashhead *pgrphashtbl; u_long pgrphash; struct proclist allproc; struct proclist zombproc; struct sx allproc_lock; struct sx proctree_lock; vm_zone_t proc_zone; vm_zone_t ithread_zone; /* * Initialize global process hashing structures. */ void procinit() { int i, j; sx_init(&allproc_lock, "allproc"); sx_init(&proctree_lock, "proctree"); LIST_INIT(&allproc); LIST_INIT(&zombproc); pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash); pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash); proc_zone = zinit("PROC", sizeof (struct proc), 0, 0, 5); uihashinit(); /* * This should really be a compile time warning, but I do * not know of any way to do that... */ if (sizeof(struct kinfo_proc) != KINFO_PROC_SIZE) { printf("This message will repeat for the next 20 seconds\n"); for (i = 0; i < 20; i++) { printf("WARNING: size of kinfo_proc (%ld) should be %d!!!\n", (long)sizeof(struct kinfo_proc), KINFO_PROC_SIZE); printf("The kinfo_proc structure was changed "); printf("incorrectly in \n"); for (j = 0; j < 0x7ffffff; j++); } } } /* * Is p an inferior of the current process? */ int inferior(p) register struct proc *p; { int rval; PROC_LOCK_ASSERT(p, MA_OWNED); if (p == curproc) return (1); if (p->p_pid == 0) return (0); PROC_LOCK(p->p_pptr); rval = inferior(p->p_pptr); PROC_UNLOCK(p->p_pptr); return (rval); } /* * Locate a process by number */ struct proc * pfind(pid) register pid_t pid; { register struct proc *p; sx_slock(&allproc_lock); LIST_FOREACH(p, PIDHASH(pid), p_hash) if (p->p_pid == pid) { PROC_LOCK(p); break; } sx_sunlock(&allproc_lock); return (p); } /* * Locate a process group by number */ struct pgrp * pgfind(pgid) register pid_t pgid; { register struct pgrp *pgrp; LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash) if (pgrp->pg_id == pgid) return (pgrp); return (NULL); } /* * Move p to a new or existing process group (and session) */ int enterpgrp(p, pgid, mksess) register struct proc *p; pid_t pgid; int mksess; { register struct pgrp *pgrp = pgfind(pgid); struct pgrp *savegrp; KASSERT(pgrp == NULL || !mksess, ("enterpgrp: setsid into non-empty pgrp")); KASSERT(!SESS_LEADER(p), ("enterpgrp: session leader attempted setpgrp")); if (pgrp == NULL) { pid_t savepid = p->p_pid; struct proc *np; /* * new process group */ KASSERT(p->p_pid == pgid, ("enterpgrp: new pgrp and pid != pgid")); if ((np = pfind(savepid)) == NULL || np != p) { if (np != NULL) PROC_UNLOCK(np); return (ESRCH); } PROC_UNLOCK(np); MALLOC(pgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP, M_WAITOK); if (mksess) { register struct session *sess; /* * new session */ MALLOC(sess, struct session *, sizeof(struct session), M_SESSION, M_WAITOK); sess->s_leader = p; sess->s_sid = p->p_pid; sess->s_count = 1; sess->s_ttyvp = NULL; sess->s_ttyp = NULL; bcopy(p->p_session->s_login, sess->s_login, sizeof(sess->s_login)); PROC_LOCK(p); p->p_flag &= ~P_CONTROLT; PROC_UNLOCK(p); pgrp->pg_session = sess; KASSERT(p == curproc, ("enterpgrp: mksession and p != curproc")); } else { pgrp->pg_session = p->p_session; pgrp->pg_session->s_count++; } pgrp->pg_id = pgid; LIST_INIT(&pgrp->pg_members); LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash); pgrp->pg_jobc = 0; SLIST_INIT(&pgrp->pg_sigiolst); } else if (pgrp == p->p_pgrp) return (0); /* * Adjust eligibility of affected pgrps to participate in job control. * Increment eligibility counts before decrementing, otherwise we * could reach 0 spuriously during the first call. */ fixjobc(p, pgrp, 1); fixjobc(p, p->p_pgrp, 0); PROC_LOCK(p); LIST_REMOVE(p, p_pglist); savegrp = p->p_pgrp; p->p_pgrp = pgrp; LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist); PROC_UNLOCK(p); if (LIST_EMPTY(&savegrp->pg_members)) pgdelete(savegrp); return (0); } /* * remove process from process group */ int leavepgrp(p) register struct proc *p; { struct pgrp *savegrp; PROC_LOCK(p); LIST_REMOVE(p, p_pglist); savegrp = p->p_pgrp; p->p_pgrp = NULL; PROC_UNLOCK(p); if (LIST_EMPTY(&savegrp->pg_members)) pgdelete(savegrp); return (0); } /* * delete a process group */ static void pgdelete(pgrp) register struct pgrp *pgrp; { /* * Reset any sigio structures pointing to us as a result of * F_SETOWN with our pgid. */ funsetownlst(&pgrp->pg_sigiolst); if (pgrp->pg_session->s_ttyp != NULL && pgrp->pg_session->s_ttyp->t_pgrp == pgrp) pgrp->pg_session->s_ttyp->t_pgrp = NULL; LIST_REMOVE(pgrp, pg_hash); if (--pgrp->pg_session->s_count == 0) FREE(pgrp->pg_session, M_SESSION); FREE(pgrp, M_PGRP); } /* * Adjust pgrp jobc counters when specified process changes process group. * We count the number of processes in each process group that "qualify" * the group for terminal job control (those with a parent in a different * process group of the same session). If that count reaches zero, the * process group becomes orphaned. Check both the specified process' * process group and that of its children. * entering == 0 => p is leaving specified group. * entering == 1 => p is entering specified group. */ void fixjobc(p, pgrp, entering) register struct proc *p; register struct pgrp *pgrp; int entering; { register struct pgrp *hispgrp; register struct session *mysession = pgrp->pg_session; /* * Check p's parent to see whether p qualifies its own process * group; if so, adjust count for p's process group. */ sx_slock(&proctree_lock); if ((hispgrp = p->p_pptr->p_pgrp) != pgrp && hispgrp->pg_session == mysession) { if (entering) pgrp->pg_jobc++; else if (--pgrp->pg_jobc == 0) orphanpg(pgrp); } /* * Check this process' children to see whether they qualify * their process groups; if so, adjust counts for children's * process groups. */ LIST_FOREACH(p, &p->p_children, p_sibling) if ((hispgrp = p->p_pgrp) != pgrp && hispgrp->pg_session == mysession && p->p_stat != SZOMB) { if (entering) hispgrp->pg_jobc++; else if (--hispgrp->pg_jobc == 0) orphanpg(hispgrp); } sx_sunlock(&proctree_lock); } /* * A process group has become orphaned; * if there are any stopped processes in the group, * hang-up all process in that group. */ static void orphanpg(pg) struct pgrp *pg; { register struct proc *p; mtx_lock_spin(&sched_lock); LIST_FOREACH(p, &pg->pg_members, p_pglist) { if (p->p_stat == SSTOP) { mtx_unlock_spin(&sched_lock); LIST_FOREACH(p, &pg->pg_members, p_pglist) { PROC_LOCK(p); psignal(p, SIGHUP); psignal(p, SIGCONT); PROC_UNLOCK(p); } return; } } mtx_unlock_spin(&sched_lock); } #include "opt_ddb.h" #ifdef DDB #include DB_SHOW_COMMAND(pgrpdump, pgrpdump) { register struct pgrp *pgrp; register struct proc *p; register int i; for (i = 0; i <= pgrphash; i++) { if (!LIST_EMPTY(&pgrphashtbl[i])) { printf("\tindx %d\n", i); LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) { printf( "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n", (void *)pgrp, (long)pgrp->pg_id, (void *)pgrp->pg_session, pgrp->pg_session->s_count, (void *)LIST_FIRST(&pgrp->pg_members)); LIST_FOREACH(p, &pgrp->pg_members, p_pglist) { printf("\t\tpid %ld addr %p pgrp %p\n", (long)p->p_pid, (void *)p, (void *)p->p_pgrp); } } } } } #endif /* DDB */ /* * Fill in an kinfo_proc structure for the specified process. */ void fill_kinfo_proc(p, kp) struct proc *p; struct kinfo_proc *kp; { struct tty *tp; struct session *sp; bzero(kp, sizeof(*kp)); kp->ki_structsize = sizeof(*kp); kp->ki_paddr = p; PROC_LOCK(p); kp->ki_addr = p->p_addr; kp->ki_args = p->p_args; kp->ki_tracep = p->p_tracep; kp->ki_textvp = p->p_textvp; kp->ki_fd = p->p_fd; kp->ki_vmspace = p->p_vmspace; if (p->p_ucred) { kp->ki_uid = p->p_ucred->cr_uid; kp->ki_ruid = p->p_ucred->cr_ruid; kp->ki_svuid = p->p_ucred->cr_svuid; /* XXX bde doesn't like KI_NGROUPS */ kp->ki_ngroups = min(p->p_ucred->cr_ngroups, KI_NGROUPS); bcopy(p->p_ucred->cr_groups, kp->ki_groups, kp->ki_ngroups * sizeof(gid_t)); kp->ki_rgid = p->p_ucred->cr_rgid; kp->ki_svgid = p->p_ucred->cr_svgid; } if (p->p_procsig) { kp->ki_sigignore = p->p_procsig->ps_sigignore; kp->ki_sigcatch = p->p_procsig->ps_sigcatch; } mtx_lock_spin(&sched_lock); if (p->p_stat != SIDL && p->p_stat != SZOMB && p->p_vmspace != NULL) { struct vmspace *vm = p->p_vmspace; kp->ki_size = vm->vm_map.size; kp->ki_rssize = vmspace_resident_count(vm); /*XXX*/ kp->ki_swrss = vm->vm_swrss; kp->ki_tsize = vm->vm_tsize; kp->ki_dsize = vm->vm_dsize; kp->ki_ssize = vm->vm_ssize; } if ((p->p_sflag & PS_INMEM) && p->p_stats) { kp->ki_start = p->p_stats->p_start; kp->ki_rusage = p->p_stats->p_ru; kp->ki_childtime.tv_sec = p->p_stats->p_cru.ru_utime.tv_sec + p->p_stats->p_cru.ru_stime.tv_sec; kp->ki_childtime.tv_usec = p->p_stats->p_cru.ru_utime.tv_usec + p->p_stats->p_cru.ru_stime.tv_usec; } if (p->p_wmesg != NULL) strncpy(kp->ki_wmesg, p->p_wmesg, sizeof(kp->ki_wmesg) - 1); if (p->p_stat == SMTX) { kp->ki_kiflag |= KI_MTXBLOCK; strncpy(kp->ki_mtxname, p->p_mtxname, sizeof(kp->ki_mtxname) - 1); } kp->ki_stat = p->p_stat; kp->ki_sflag = p->p_sflag; kp->ki_pctcpu = p->p_pctcpu; kp->ki_estcpu = p->p_estcpu; kp->ki_slptime = p->p_slptime; kp->ki_swtime = p->p_swtime; kp->ki_wchan = p->p_wchan; kp->ki_traceflag = p->p_traceflag; kp->ki_pri = p->p_pri; kp->ki_nice = p->p_nice; kp->ki_runtime = p->p_runtime; kp->ki_pid = p->p_pid; kp->ki_rqindex = p->p_rqindex; kp->ki_oncpu = p->p_oncpu; kp->ki_lastcpu = p->p_lastcpu; mtx_unlock_spin(&sched_lock); sp = NULL; if (p->p_pgrp) { kp->ki_pgid = p->p_pgrp->pg_id; kp->ki_jobc = p->p_pgrp->pg_jobc; sp = p->p_pgrp->pg_session; if (sp != NULL) { kp->ki_sid = sp->s_sid; strncpy(kp->ki_login, sp->s_login, sizeof(kp->ki_login) - 1); if (sp->s_ttyvp) kp->ki_kiflag = KI_CTTY; if (SESS_LEADER(p)) kp->ki_kiflag |= KI_SLEADER; } } if ((p->p_flag & P_CONTROLT) && sp && ((tp = sp->s_ttyp) != NULL)) { kp->ki_tdev = dev2udev(tp->t_dev); kp->ki_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; if (tp->t_session) kp->ki_tsid = tp->t_session->s_sid; } else kp->ki_tdev = NOUDEV; if (p->p_comm[0] != '\0') { strncpy(kp->ki_comm, p->p_comm, sizeof(kp->ki_comm) - 1); strncpy(kp->ki_ocomm, p->p_comm, sizeof(kp->ki_ocomm) - 1); } kp->ki_siglist = p->p_siglist; kp->ki_sigmask = p->p_sigmask; kp->ki_xstat = p->p_xstat; kp->ki_acflag = p->p_acflag; kp->ki_flag = p->p_flag; /* If jailed(p->p_ucred), emulate the old P_JAILED flag. */ if (jailed(p->p_ucred)) kp->ki_flag |= P_JAILED; kp->ki_lock = p->p_lock; if (p->p_pptr) kp->ki_ppid = p->p_pptr->p_pid; PROC_UNLOCK(p); } /* * Locate a zombie process by number */ struct proc * zpfind(pid_t pid) { struct proc *p; sx_slock(&allproc_lock); LIST_FOREACH(p, &zombproc, p_list) if (p->p_pid == pid) { PROC_LOCK(p); break; } sx_sunlock(&allproc_lock); return (p); } static int sysctl_out_proc(struct proc *p, struct sysctl_req *req, int doingzomb) { struct kinfo_proc kinfo_proc; int error; struct proc *np; pid_t pid = p->p_pid; fill_kinfo_proc(p, &kinfo_proc); error = SYSCTL_OUT(req, (caddr_t)&kinfo_proc, sizeof(kinfo_proc)); if (error) return (error); if (doingzomb) np = zpfind(pid); else { if (pid == 0) return (0); np = pfind(pid); } if (np == NULL) return EAGAIN; if (np != p) { PROC_UNLOCK(np); return EAGAIN; } PROC_UNLOCK(np); return (0); } static int sysctl_kern_proc(SYSCTL_HANDLER_ARGS) { int *name = (int*) arg1; u_int namelen = arg2; struct proc *p; int doingzomb; int error = 0; if (oidp->oid_number == KERN_PROC_PID) { if (namelen != 1) return (EINVAL); p = pfind((pid_t)name[0]); if (!p) return (0); if (p_cansee(curproc, p)) { PROC_UNLOCK(p); return (0); } PROC_UNLOCK(p); error = sysctl_out_proc(p, req, 0); return (error); } if (oidp->oid_number == KERN_PROC_ALL && !namelen) ; else if (oidp->oid_number != KERN_PROC_ALL && namelen == 1) ; else return (EINVAL); if (!req->oldptr) { /* overestimate by 5 procs */ error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5); if (error) return (error); } sx_slock(&allproc_lock); for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) { if (!doingzomb) p = LIST_FIRST(&allproc); else p = LIST_FIRST(&zombproc); for (; p != 0; p = LIST_NEXT(p, p_list)) { /* * Show a user only appropriate processes. */ if (p_cansee(curproc, p)) continue; /* * Skip embryonic processes. */ if (p->p_stat == SIDL) continue; /* * TODO - make more efficient (see notes below). * do by session. */ switch (oidp->oid_number) { case KERN_PROC_PGRP: /* could do this by traversing pgrp */ if (p->p_pgrp == NULL || p->p_pgrp->pg_id != (pid_t)name[0]) continue; break; case KERN_PROC_TTY: if ((p->p_flag & P_CONTROLT) == 0 || p->p_session == NULL || p->p_session->s_ttyp == NULL || dev2udev(p->p_session->s_ttyp->t_dev) != (udev_t)name[0]) continue; break; case KERN_PROC_UID: if (p->p_ucred == NULL || p->p_ucred->cr_uid != (uid_t)name[0]) continue; break; case KERN_PROC_RUID: if (p->p_ucred == NULL || p->p_ucred->cr_ruid != (uid_t)name[0]) continue; break; } if (p_cansee(curproc, p)) continue; error = sysctl_out_proc(p, req, doingzomb); if (error) { sx_sunlock(&allproc_lock); return (error); } } } sx_sunlock(&allproc_lock); return (0); } /* * This sysctl allows a process to retrieve the argument list or process * title for another process without groping around in the address space * of the other process. It also allow a process to set its own "process * title to a string of its own choice. */ static int sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS) { int *name = (int*) arg1; u_int namelen = arg2; struct proc *p; struct pargs *pa; int error = 0; if (namelen != 1) return (EINVAL); p = pfind((pid_t)name[0]); if (!p) return (0); if ((!ps_argsopen) && p_cansee(curproc, p)) { PROC_UNLOCK(p); return (0); } PROC_UNLOCK(p); if (req->newptr && curproc != p) return (EPERM); if (req->oldptr && p->p_args != NULL) error = SYSCTL_OUT(req, p->p_args->ar_args, p->p_args->ar_length); if (req->newptr == NULL) return (error); PROC_LOCK(p); pa = p->p_args; p->p_args = NULL; PROC_UNLOCK(p); if (pa != NULL && --pa->ar_ref == 0) FREE(pa, M_PARGS); if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit) return (error); MALLOC(pa, struct pargs *, sizeof(struct pargs) + req->newlen, M_PARGS, M_WAITOK); pa->ar_ref = 1; pa->ar_length = req->newlen; error = SYSCTL_IN(req, pa->ar_args, req->newlen); if (!error) { PROC_LOCK(p); p->p_args = pa; PROC_UNLOCK(p); } else FREE(pa, M_PARGS); return (error); } SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table"); SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT, 0, 0, sysctl_kern_proc, "S,proc", "Return entire process table"); SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD, sysctl_kern_proc, "Process table"); SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD, sysctl_kern_proc, "Process table"); SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD, sysctl_kern_proc, "Process table"); SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD, sysctl_kern_proc, "Process table"); SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD, sysctl_kern_proc, "Process table"); SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, CTLFLAG_RW | CTLFLAG_ANYBODY, sysctl_kern_proc_args, "Process argument list");