382 lines
9.5 KiB
C
382 lines
9.5 KiB
C
/* $NetBSD: kern_proc.c,v 1.14 1996/02/09 18:59:41 christos Exp $ */
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/*
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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 8.4 (Berkeley) 1/4/94
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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/map.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/buf.h>
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#include <sys/acct.h>
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#include <sys/wait.h>
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#include <sys/file.h>
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#include <ufs/ufs/quota.h>
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#include <sys/uio.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/ioctl.h>
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#include <sys/tty.h>
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#include <sys/signalvar.h>
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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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};
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#define UIHASH(uid) (&uihashtbl[(uid) & uihash])
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LIST_HEAD(uihashhead, uidinfo) *uihashtbl;
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u_long uihash; /* size of hash table - 1 */
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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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static void orphanpg __P((struct pgrp *));
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#ifdef DEBUG
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void pgrpdump __P((void));
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#endif
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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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}
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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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return (uip->ui_proccnt);
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if (uip->ui_proccnt < 0)
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panic("chgproccnt: procs < 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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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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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; 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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#ifdef DIAGNOSTIC
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if (pgrp != NULL && mksess) /* firewalls */
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panic("enterpgrp: setsid into non-empty pgrp");
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if (SESS_LEADER(p))
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panic("enterpgrp: session leader attempted setpgrp");
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#endif
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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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#ifdef DIAGNOSTIC
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if (p->p_pid != pgid)
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panic("enterpgrp: new pgrp and pid != pgid");
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#endif
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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_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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#ifdef DIAGNOSTIC
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if (p != curproc)
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panic("enterpgrp: mksession and p != curproc");
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#endif
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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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} 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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void
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pgdelete(pgrp)
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register struct pgrp *pgrp;
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{
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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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* 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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* 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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#ifdef DEBUG
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void
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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 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("\tpgrp %p, pgid %d, sess %p, sesscnt %d, mem %p\n",
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pgrp, pgrp->pg_id, pgrp->pg_session,
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pgrp->pg_session->s_count,
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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 %d addr %p pgrp %p\n",
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p->p_pid, p, 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 /* DEBUG */
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