636 lines
15 KiB
C
636 lines
15 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_proc.c 8.7 (Berkeley) 2/14/95
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/filedesc.h>
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#include <sys/tty.h>
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#include <sys/signalvar.h>
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#include <vm/vm.h>
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#include <sys/lock.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <sys/user.h>
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#include <vm/vm_zone.h>
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static MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
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MALLOC_DEFINE(M_SESSION, "session", "session header");
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static MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
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MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
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static void pgdelete __P((struct pgrp *));
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/*
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* Structure associated with user cacheing.
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*/
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struct uidinfo {
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LIST_ENTRY(uidinfo) ui_hash;
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uid_t ui_uid;
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long ui_proccnt;
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rlim_t ui_sbsize;
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};
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#define UIHASH(uid) (&uihashtbl[(uid) & uihash])
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static LIST_HEAD(uihashhead, uidinfo) *uihashtbl;
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static u_long uihash; /* size of hash table - 1 */
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static void orphanpg __P((struct pgrp *pg));
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/*
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* Other process lists
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*/
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struct pidhashhead *pidhashtbl;
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u_long pidhash;
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struct pgrphashhead *pgrphashtbl;
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u_long pgrphash;
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struct proclist allproc;
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struct proclist zombproc;
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vm_zone_t proc_zone;
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/*
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* Initialize global process hashing structures.
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*/
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void
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procinit()
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{
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LIST_INIT(&allproc);
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LIST_INIT(&zombproc);
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pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
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pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
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uihashtbl = hashinit(maxproc / 16, M_PROC, &uihash);
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proc_zone = zinit("PROC", sizeof (struct proc), 0, 0, 5);
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}
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/*
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* Change the count associated with number of processes
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* a given user is using.
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*/
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int
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chgproccnt(uid, diff)
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uid_t uid;
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int diff;
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{
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register struct uidinfo *uip;
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register struct uihashhead *uipp;
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uipp = UIHASH(uid);
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for (uip = uipp->lh_first; uip != 0; uip = uip->ui_hash.le_next)
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if (uip->ui_uid == uid)
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break;
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if (uip) {
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uip->ui_proccnt += diff;
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if (uip->ui_proccnt < 0)
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panic("chgproccnt: procs < 0");
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if (uip->ui_proccnt > 0 || uip->ui_sbsize > 0)
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return (uip->ui_proccnt);
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LIST_REMOVE(uip, ui_hash);
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FREE(uip, M_PROC);
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return (0);
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}
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if (diff <= 0) {
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if (diff == 0)
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return(0);
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panic("chgproccnt: lost user");
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}
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MALLOC(uip, struct uidinfo *, sizeof(*uip), M_PROC, M_WAITOK);
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LIST_INSERT_HEAD(uipp, uip, ui_hash);
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uip->ui_uid = uid;
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uip->ui_proccnt = diff;
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uip->ui_sbsize = 0;
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return (diff);
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}
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/*
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* Change the total socket buffer size a user has used.
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*/
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rlim_t
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chgsbsize(uid, diff)
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uid_t uid;
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rlim_t diff;
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{
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register struct uidinfo *uip;
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register struct uihashhead *uipp;
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uipp = UIHASH(uid);
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for (uip = uipp->lh_first; uip != 0; uip = uip->ui_hash.le_next)
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if (uip->ui_uid == uid)
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break;
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if (diff <= 0) {
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if (diff == 0)
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return (uip ? uip->ui_sbsize : 0);
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KASSERT(uip != NULL, ("uidinfo (%d) gone", uid));
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}
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if (uip) {
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uip->ui_sbsize += diff;
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KASSERT(uip->ui_sbsize >= 0, ("ui_sbsize (%d) < 0", uid));
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if (uip->ui_sbsize == 0 && uip->ui_proccnt == 0) {
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LIST_REMOVE(uip, ui_hash);
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FREE(uip, M_PROC);
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return (0);
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}
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return (uip->ui_sbsize);
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}
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MALLOC(uip, struct uidinfo *, sizeof(*uip), M_PROC, M_WAITOK);
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LIST_INSERT_HEAD(uipp, uip, ui_hash);
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uip->ui_uid = uid;
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uip->ui_proccnt = 0;
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uip->ui_sbsize = diff;
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return (diff);
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}
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/*
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* Is p an inferior of the current process?
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*/
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int
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inferior(p)
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register struct proc *p;
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{
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for (; p != curproc; p = p->p_pptr)
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if (p->p_pid == 0)
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return (0);
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return (1);
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}
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/*
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* Locate a process by number
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*/
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struct proc *
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pfind(pid)
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register pid_t pid;
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{
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register struct proc *p;
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for (p = PIDHASH(pid)->lh_first; p != 0; p = p->p_hash.le_next)
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if (p->p_pid == pid)
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return (p);
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return (NULL);
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}
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/*
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* Locate a process group by number
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*/
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struct pgrp *
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pgfind(pgid)
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register pid_t pgid;
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{
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register struct pgrp *pgrp;
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for (pgrp = PGRPHASH(pgid)->lh_first; pgrp != 0;
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pgrp = pgrp->pg_hash.le_next)
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if (pgrp->pg_id == pgid)
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return (pgrp);
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return (NULL);
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}
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/*
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* Move p to a new or existing process group (and session)
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*/
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int
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enterpgrp(p, pgid, mksess)
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register struct proc *p;
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pid_t pgid;
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int mksess;
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{
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register struct pgrp *pgrp = pgfind(pgid);
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KASSERT(pgrp == NULL || !mksess,
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("enterpgrp: setsid into non-empty pgrp"));
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KASSERT(!SESS_LEADER(p),
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("enterpgrp: session leader attempted setpgrp"));
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if (pgrp == NULL) {
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pid_t savepid = p->p_pid;
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struct proc *np;
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/*
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* new process group
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*/
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KASSERT(p->p_pid == pgid,
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("enterpgrp: new pgrp and pid != pgid"));
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MALLOC(pgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP,
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M_WAITOK);
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if ((np = pfind(savepid)) == NULL || np != p)
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return (ESRCH);
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if (mksess) {
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register struct session *sess;
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/*
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* new session
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*/
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MALLOC(sess, struct session *, sizeof(struct session),
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M_SESSION, M_WAITOK);
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sess->s_leader = p;
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sess->s_sid = p->p_pid;
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sess->s_count = 1;
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sess->s_ttyvp = NULL;
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sess->s_ttyp = NULL;
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bcopy(p->p_session->s_login, sess->s_login,
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sizeof(sess->s_login));
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p->p_flag &= ~P_CONTROLT;
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pgrp->pg_session = sess;
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KASSERT(p == curproc,
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("enterpgrp: mksession and p != curproc"));
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} else {
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pgrp->pg_session = p->p_session;
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pgrp->pg_session->s_count++;
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}
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pgrp->pg_id = pgid;
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LIST_INIT(&pgrp->pg_members);
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LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
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pgrp->pg_jobc = 0;
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SLIST_INIT(&pgrp->pg_sigiolst);
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} else if (pgrp == p->p_pgrp)
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return (0);
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/*
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* Adjust eligibility of affected pgrps to participate in job control.
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* Increment eligibility counts before decrementing, otherwise we
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* could reach 0 spuriously during the first call.
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*/
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fixjobc(p, pgrp, 1);
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fixjobc(p, p->p_pgrp, 0);
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LIST_REMOVE(p, p_pglist);
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if (p->p_pgrp->pg_members.lh_first == 0)
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pgdelete(p->p_pgrp);
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p->p_pgrp = pgrp;
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LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
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return (0);
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}
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/*
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* remove process from process group
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*/
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int
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leavepgrp(p)
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register struct proc *p;
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{
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LIST_REMOVE(p, p_pglist);
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if (p->p_pgrp->pg_members.lh_first == 0)
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pgdelete(p->p_pgrp);
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p->p_pgrp = 0;
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return (0);
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}
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/*
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* delete a process group
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*/
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static void
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pgdelete(pgrp)
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register struct pgrp *pgrp;
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{
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/*
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* Reset any sigio structures pointing to us as a result of
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* F_SETOWN with our pgid.
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*/
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funsetownlst(&pgrp->pg_sigiolst);
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if (pgrp->pg_session->s_ttyp != NULL &&
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pgrp->pg_session->s_ttyp->t_pgrp == pgrp)
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pgrp->pg_session->s_ttyp->t_pgrp = NULL;
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LIST_REMOVE(pgrp, pg_hash);
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if (--pgrp->pg_session->s_count == 0)
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FREE(pgrp->pg_session, M_SESSION);
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FREE(pgrp, M_PGRP);
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}
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/*
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* Adjust pgrp jobc counters when specified process changes process group.
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* We count the number of processes in each process group that "qualify"
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* the group for terminal job control (those with a parent in a different
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* process group of the same session). If that count reaches zero, the
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* process group becomes orphaned. Check both the specified process'
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* process group and that of its children.
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* entering == 0 => p is leaving specified group.
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* entering == 1 => p is entering specified group.
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*/
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void
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fixjobc(p, pgrp, entering)
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register struct proc *p;
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register struct pgrp *pgrp;
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int entering;
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{
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register struct pgrp *hispgrp;
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register struct session *mysession = pgrp->pg_session;
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/*
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* Check p's parent to see whether p qualifies its own process
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* group; if so, adjust count for p's process group.
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*/
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if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
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hispgrp->pg_session == mysession) {
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if (entering)
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pgrp->pg_jobc++;
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else if (--pgrp->pg_jobc == 0)
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orphanpg(pgrp);
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}
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/*
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* Check this process' children to see whether they qualify
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* their process groups; if so, adjust counts for children's
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* process groups.
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*/
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for (p = p->p_children.lh_first; p != 0; p = p->p_sibling.le_next)
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if ((hispgrp = p->p_pgrp) != pgrp &&
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hispgrp->pg_session == mysession &&
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p->p_stat != SZOMB) {
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if (entering)
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hispgrp->pg_jobc++;
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else if (--hispgrp->pg_jobc == 0)
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orphanpg(hispgrp);
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}
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}
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/*
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* A process group has become orphaned;
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* if there are any stopped processes in the group,
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* hang-up all process in that group.
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*/
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static void
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orphanpg(pg)
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struct pgrp *pg;
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{
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register struct proc *p;
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for (p = pg->pg_members.lh_first; p != 0; p = p->p_pglist.le_next) {
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if (p->p_stat == SSTOP) {
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for (p = pg->pg_members.lh_first; p != 0;
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p = p->p_pglist.le_next) {
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psignal(p, SIGHUP);
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psignal(p, SIGCONT);
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}
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return;
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}
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}
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}
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#include "opt_ddb.h"
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#ifdef DDB
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#include <ddb/ddb.h>
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DB_SHOW_COMMAND(pgrpdump, pgrpdump)
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{
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register struct pgrp *pgrp;
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register struct proc *p;
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register int i;
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for (i = 0; i <= pgrphash; i++) {
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if ((pgrp = pgrphashtbl[i].lh_first) != NULL) {
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printf("\tindx %d\n", i);
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for (; pgrp != 0; pgrp = pgrp->pg_hash.le_next) {
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printf(
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"\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
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(void *)pgrp, (long)pgrp->pg_id,
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(void *)pgrp->pg_session,
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pgrp->pg_session->s_count,
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(void *)pgrp->pg_members.lh_first);
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for (p = pgrp->pg_members.lh_first; p != 0;
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p = p->p_pglist.le_next) {
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printf("\t\tpid %ld addr %p pgrp %p\n",
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(long)p->p_pid, (void *)p,
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(void *)p->p_pgrp);
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}
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}
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}
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}
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}
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#endif /* DDB */
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/*
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* Fill in an eproc structure for the specified process.
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*/
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void
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fill_eproc(p, ep)
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register struct proc *p;
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register struct eproc *ep;
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{
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register struct tty *tp;
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bzero(ep, sizeof(*ep));
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ep->e_paddr = p;
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if (p->p_cred) {
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ep->e_pcred = *p->p_cred;
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if (p->p_ucred)
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ep->e_ucred = *p->p_ucred;
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}
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if (p->p_procsig){
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ep->e_procsig = *p->p_procsig;
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}
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if (p->p_stat != SIDL && p->p_stat != SZOMB && p->p_vmspace != NULL) {
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register struct vmspace *vm = p->p_vmspace;
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ep->e_vm = *vm;
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ep->e_vm.vm_rssize = vmspace_resident_count(vm); /*XXX*/
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}
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if (p->p_pptr)
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ep->e_ppid = p->p_pptr->p_pid;
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if (p->p_pgrp) {
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ep->e_pgid = p->p_pgrp->pg_id;
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ep->e_jobc = p->p_pgrp->pg_jobc;
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ep->e_sess = p->p_pgrp->pg_session;
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if (ep->e_sess) {
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bcopy(ep->e_sess->s_login, ep->e_login, sizeof(ep->e_login));
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if (ep->e_sess->s_ttyvp)
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ep->e_flag = EPROC_CTTY;
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if (p->p_session && SESS_LEADER(p))
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ep->e_flag |= EPROC_SLEADER;
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}
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}
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if ((p->p_flag & P_CONTROLT) &&
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(ep->e_sess != NULL) &&
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((tp = ep->e_sess->s_ttyp) != NULL)) {
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ep->e_tdev = dev2udev(tp->t_dev);
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ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
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ep->e_tsess = tp->t_session;
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} else
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ep->e_tdev = NOUDEV;
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if (p->p_wmesg) {
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strncpy(ep->e_wmesg, p->p_wmesg, WMESGLEN);
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ep->e_wmesg[WMESGLEN] = 0;
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}
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}
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static struct proc *
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zpfind(pid_t pid)
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{
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struct proc *p;
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|
|
for (p = zombproc.lh_first; p != 0; p = p->p_list.le_next)
|
|
if (p->p_pid == pid)
|
|
return (p);
|
|
return (NULL);
|
|
}
|
|
|
|
|
|
static int
|
|
sysctl_out_proc(struct proc *p, struct sysctl_req *req, int doingzomb)
|
|
{
|
|
struct eproc eproc;
|
|
int error;
|
|
pid_t pid = p->p_pid;
|
|
|
|
fill_eproc(p, &eproc);
|
|
error = SYSCTL_OUT(req,(caddr_t)p, sizeof(struct proc));
|
|
if (error)
|
|
return (error);
|
|
error = SYSCTL_OUT(req,(caddr_t)&eproc, sizeof(eproc));
|
|
if (error)
|
|
return (error);
|
|
if (!doingzomb && pid && (pfind(pid) != p))
|
|
return EAGAIN;
|
|
if (doingzomb && zpfind(pid) != p)
|
|
return EAGAIN;
|
|
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 (!PRISON_CHECK(curproc, p))
|
|
return (0);
|
|
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);
|
|
}
|
|
for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
|
|
if (!doingzomb)
|
|
p = allproc.lh_first;
|
|
else
|
|
p = zombproc.lh_first;
|
|
for (; p != 0; p = p->p_list.le_next) {
|
|
/*
|
|
* 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_cred->p_ruid != (uid_t)name[0])
|
|
continue;
|
|
break;
|
|
}
|
|
|
|
if (!PRISON_CHECK(curproc, p))
|
|
continue;
|
|
|
|
error = sysctl_out_proc(p, req, doingzomb);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
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");
|