330 lines
8.1 KiB
C
330 lines
8.1 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California.
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* 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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* from: @(#)kern_proc.c 7.16 (Berkeley) 6/28/91
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* $Id: kern_proc.c,v 1.4 1993/06/27 06:01:40 andrew Exp $
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*/
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#include "param.h"
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#include "systm.h"
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#include "kernel.h"
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#include "proc.h"
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#include "buf.h"
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#include "acct.h"
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#include "wait.h"
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#include "file.h"
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#include "../ufs/quota.h"
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#include "uio.h"
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#include "malloc.h"
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#include "mbuf.h"
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#include "ioctl.h"
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#include "tty.h"
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/* static */ void pgdelete __P((struct pgrp *pgrp));
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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;
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{
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register struct proc *p = pidhash[PIDHASH(pid)];
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for (; p; p = p->p_hash)
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if (p->p_pid == pid)
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return (p);
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return ((struct proc *)0);
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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 = pgrphash[PIDHASH(pgid)];
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for (; pgrp; pgrp = pgrp->pg_hforw)
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if (pgrp->pg_id == pgid)
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return (pgrp);
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return ((struct pgrp *)0);
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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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void
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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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register struct proc **pp;
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int n;
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#ifdef DIAGNOSTIC
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if (pgrp && 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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/*
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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 (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 &= ~SCTTY;
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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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pgrp->pg_hforw = pgrphash[n = PIDHASH(pgid)];
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pgrphash[n] = pgrp;
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pgrp->pg_jobc = 0;
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pgrp->pg_mem = NULL;
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} else if (pgrp == p->p_pgrp)
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return;
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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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/*
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* unlink p from old process group
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*/
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for (pp = &p->p_pgrp->pg_mem; *pp; pp = &(*pp)->p_pgrpnxt)
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if (*pp == p) {
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*pp = p->p_pgrpnxt;
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goto done;
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}
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panic("enterpgrp: can't find p on old pgrp");
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done:
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/*
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* delete old if empty
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*/
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if (p->p_pgrp->pg_mem == 0)
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pgdelete(p->p_pgrp);
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/*
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* link into new one
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*/
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p->p_pgrp = pgrp;
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p->p_pgrpnxt = pgrp->pg_mem;
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pgrp->pg_mem = p;
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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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void
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leavepgrp(p)
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register struct proc *p;
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{
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register struct proc **pp = &p->p_pgrp->pg_mem;
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for (; *pp; pp = &(*pp)->p_pgrpnxt)
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if (*pp == p) {
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*pp = p->p_pgrpnxt;
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goto done;
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}
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panic("leavepgrp: can't find p in pgrp");
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done:
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if (!p->p_pgrp->pg_mem)
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pgdelete(p->p_pgrp);
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p->p_pgrp = 0;
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}
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/*
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* delete a process group [internal]
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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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register struct pgrp **pgp = &pgrphash[PIDHASH(pgrp->pg_id)];
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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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for (; *pgp; pgp = &(*pgp)->pg_hforw)
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if (*pgp == pgrp) {
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*pgp = pgrp->pg_hforw;
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goto done;
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}
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panic("pgdelete: can't find pgrp on hash chain");
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done:
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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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static void orphanpg();
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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_cptr; p; p = p->p_osptr)
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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_mem; p; p = p->p_pgrpnxt) {
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if (p->p_stat == SSTOP) {
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for (p = pg->pg_mem; p; p = p->p_pgrpnxt) {
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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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/* 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<PIDHSZ; i++) {
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if (pgrphash[i]) {
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printf("\tindx %d\n", i);
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for (pgrp=pgrphash[i]; pgrp; pgrp=pgrp->pg_hforw) {
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printf("\tpgrp %x, pgid %d, sess %x, sesscnt %d, mem %x\n",
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pgrp, pgrp->pg_id, pgrp->pg_session,
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pgrp->pg_session->s_count, pgrp->pg_mem);
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for (p=pgrp->pg_mem; p; p=p->p_pgrpnxt) {
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printf("\t\tpid %d addr %x pgrp %x\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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