sh.proc.c 50.2 KB
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/* $Header: /p/tcsh/cvsroot/tcsh/sh.proc.c,v 3.134 2016/09/23 19:17:28 christos Exp $ */
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/*
 * sh.proc.c: Job manipulations
 */
/*-
 * Copyright (c) 1980, 1991 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. 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.
 */
#include "sh.h"

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RCSID("$tcsh: sh.proc.c,v 3.134 2016/09/23 19:17:28 christos Exp $")
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#include "ed.h"
#include "tc.h"
#include "tc.wait.h"

#ifdef WINNT_NATIVE
#undef POSIX
#define POSIX
#endif /* WINNT_NATIVE */
#ifdef aiws
# undef HZ
# define HZ 16
#endif /* aiws */

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#if defined(_BSD) || (defined(IRIS4D) && __STDC__) || defined(__lucid)
# define BSDWAIT
#endif /* _BSD || (IRIS4D && __STDC__) || __lucid */
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#ifndef WTERMSIG
# define WTERMSIG(w)	(((union wait *) &(w))->w_termsig)
# ifndef BSDWAIT
#  define BSDWAIT
# endif /* !BSDWAIT */
#endif /* !WTERMSIG */
#ifndef WEXITSTATUS
# define WEXITSTATUS(w)	(((union wait *) &(w))->w_retcode)
#endif /* !WEXITSTATUS */
#ifndef WSTOPSIG
# define WSTOPSIG(w)	(((union wait *) &(w))->w_stopsig)
#endif /* !WSTOPSIG */

#ifdef __osf__
# ifndef WCOREDUMP
#  define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG)
# endif
#endif

#ifndef WCOREDUMP
# ifdef BSDWAIT
#  define WCOREDUMP(w)	(((union wait *) &(w))->w_coredump)
# else /* !BSDWAIT */
#  define WCOREDUMP(w)	((w) & 0200)
# endif /* !BSDWAIT */
#endif /* !WCOREDUMP */

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#ifndef JOBDEBUG
# define jobdebug_xprintf(x)	(void)0
# define jobdebug_flush()	(void)0
#else
# define jobdebug_xprintf(s)	xprintf s
# define jobdebug_flush()	flush()
#endif

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/*
 * C Shell - functions that manage processes, handling hanging, termination
 */

#define BIGINDEX	9	/* largest desirable job index */

#ifdef BSDTIMES
# ifdef convex
/* use 'cvxrusage' to get parallel statistics */
static struct cvxrusage zru = {{0L, 0L}, {0L, 0L}, 0L, 0L, 0L, 0L,
				0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
				{0L, 0L}, 0LL, 0LL, 0LL, 0LL, 0L, 0L, 0L,
				0LL, 0LL, {0L, 0L, 0L, 0L, 0L}};
# else
static struct rusage zru;
# endif /* convex */
#else /* !BSDTIMES */
# ifdef _SEQUENT_
static struct process_stats zru = {{0L, 0L}, {0L, 0L}, 0, 0, 0, 0, 0, 0, 0,
				   0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
# else /* !_SEQUENT_ */
#  ifdef _SX
static struct tms zru = {0, 0, 0, 0}, lru = {0, 0, 0, 0};
#  else	/* !_SX */
static struct tms zru = {0L, 0L, 0L, 0L}, lru = {0L, 0L, 0L, 0L};
#  endif	/* !_SX */
# endif	/* !_SEQUENT_ */
#endif /* !BSDTIMES */

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#ifndef BSDTIMES
static int timesdone;	/* shtimes buffer full ? */
#endif /* BSDTIMES */

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#ifndef RUSAGE_CHILDREN
# define	RUSAGE_CHILDREN	-1
#endif /* RUSAGE_CHILDREN */

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static	void		 pflushall	(void);
static	void		 pflush		(struct process *);
static	void		 pfree		(struct process *);
static	void		 pclrcurr	(struct process *);
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static	void		 morecommand	(size_t);
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static	void		 padd		(struct command *);
static	int		 pprint		(struct process *, int);
static	void		 ptprint	(struct process *);
static	void		 pads		(Char *);
static	void		 pkill		(Char **, int);
static	struct process	*pgetcurr	(struct process *);
static	void		 okpcntl	(void);
static	void		 setttypgrp	(int);
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/*
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 * pchild - call queued by the SIGCHLD signal
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 *	indicating that at least one child has terminated or stopped
 *	thus at least one wait system call will definitely return a
 *	childs status.  Top level routines (like pwait) must be sure
 *	to mask interrupts when playing with the proclist data structures!
 */
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void
pchild(void)
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{
    struct process *pp;
    struct process *fp;
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    pid_t pid;
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#ifdef BSDWAIT
    union wait w;
#else /* !BSDWAIT */
    int     w;
#endif /* !BSDWAIT */
    int     jobflags;
#ifdef BSDTIMES
    struct sysrusage ru;
#else /* !BSDTIMES */
# ifdef _SEQUENT_
    struct process_stats ru;
    struct process_stats cpst1, cpst2;
    timeval_t tv;
# else /* !_SEQUENT_ */
    struct tms proctimes;

    if (!timesdone) {
	timesdone++;
	(void) times(&shtimes);
    }
# endif	/* !_SEQUENT_ */
#endif /* !BSDTIMES */

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    jobdebug_xprintf(("pchild()\n"));
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loop:
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    jobdebug_xprintf(("Waiting...\n"));
    jobdebug_flush();
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    errno = 0;			/* reset, just in case */
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#ifndef WINNT_NATIVE
# ifdef BSDJOBS
#  ifdef BSDTIMES
#   ifdef convex
    /* use 'cvxwait' to get parallel statistics */
    pid = cvxwait(&w,
        (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru);
#   else
    /* both a wait3 and rusage */
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#    if !defined(BSDWAIT) || defined(NeXT) || defined(MACH) || defined(__linux__) || defined(__GNU__) || defined(__GLIBC__) || (defined(IRIS4D) && SYSVREL <= 3) || defined(__lucid) || defined(__osf__)
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#ifdef __ANDROID__ /* no wait3, only wait4 */
    pid = wait4(-1, &w,
       (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru);
#else
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    pid = wait3(&w,
       (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru);
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#endif /* __ANDROID__ */
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#    else /* BSDWAIT */
    pid = wait3(&w.w_status,
       (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru);
#    endif /* BSDWAIT */
#   endif /* convex */
#  else /* !BSDTIMES */
#   ifdef _SEQUENT_
    (void) get_process_stats(&tv, PS_SELF, 0, &cpst1);
    pid = waitpid(-1, &w,
	    (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG));
    (void) get_process_stats(&tv, PS_SELF, 0, &cpst2);
    pr_stat_sub(&cpst2, &cpst1, &ru);
#   else	/* !_SEQUENT_ */
#    ifndef POSIX
    /* we have a wait3, but no rusage stuff */
    pid = wait3(&w.w_status,
	 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), 0);
#    else /* POSIX */
    pid = waitpid(-1, &w,
	    (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG));
#    endif /* POSIX */
#   endif /* !_SEQUENT_ */
#  endif	/* !BSDTIMES */
# else /* !BSDJOBS */
#  ifdef BSDTIMES
#   define HAVEwait3
    /* both a wait3 and rusage */
#   ifdef hpux
    pid = wait3(&w.w_status, WNOHANG, 0);
#   else	/* !hpux */
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#     ifndef BSDWAIT
    pid = wait3(&w, WNOHANG, &ru);
#     else
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    pid = wait3(&w.w_status, WNOHANG, &ru);
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#     endif /* BSDWAIT */
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#   endif /* !hpux */
#  else /* !BSDTIMES */
#   ifdef ODT  /* For Sco Unix 3.2.0 or ODT 1.0 */
#    define HAVEwait3
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    pid = waitpid(-1, &w,
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 	    (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG));
#   endif /* ODT */	    
#   if defined(aiws) || defined(uts)
#    define HAVEwait3
    pid = wait3(&w.w_status, 
	(setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), 0);
#   endif /* aiws || uts */
#   ifndef HAVEwait3
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#    ifndef BSDWAIT
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     /* no wait3, therefore no rusage */
     /* on Sys V, this may hang.  I hope it's not going to be a problem */
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    pid = wait(&w);
#    else /* BSDWAIT */
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     /* 
      * XXX: for greater than 3 we should use waitpid(). 
      * but then again, SVR4 falls into the POSIX/BSDJOBS category.
      */
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    pid = wait(&w.w_status);
#    endif /* BSDWAIT */
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#   endif /* !HAVEwait3 */
#  endif	/* !BSDTIMES */
# endif /* !BSDJOBS */
#else /* WINNT_NATIVE */
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    pid = waitpid(-1, &w,
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	    (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG));
#endif /* WINNT_NATIVE */

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    jobdebug_xprintf(("parent %d pid %d, retval %x termsig %x retcode %x\n",
		      (int)getpid(), (int)pid, w, WTERMSIG(w),
		      WEXITSTATUS(w)));
    jobdebug_flush();
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    if ((pid == 0) || (pid == -1)) {
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	(void)handle_pending_signals();
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	jobdebug_xprintf(("errno == %d\n", errno));
	if (errno == EINTR)
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	    goto loop;
	goto end;
    }
    for (pp = proclist.p_next; pp != NULL; pp = pp->p_next)
	if (pid == pp->p_procid)
	    goto found;
#if !defined(BSDJOBS) && !defined(WINNT_NATIVE)
    /* this should never have happened */
    stderror(ERR_SYNC, pid);
    xexit(0);
#else /* BSDJOBS || WINNT_NATIVE */
    goto loop;
#endif /* !BSDJOBS && !WINNT_NATIVE */
found:
    pp->p_flags &= ~(PRUNNING | PSTOPPED | PREPORTED);
    if (WIFSTOPPED(w)) {
	pp->p_flags |= PSTOPPED;
	pp->p_reason = WSTOPSIG(w);
    }
    else {
	if (pp->p_flags & (PTIME | PPTIME) || adrof(STRtime))
#ifndef BSDTIMES
# ifdef _SEQUENT_
	    (void) get_process_stats(&pp->p_etime, PS_SELF, NULL, NULL);
# else	/* !_SEQUENT_ */
	    pp->p_etime = times(&proctimes);
# endif	/* !_SEQUENT_ */
#else /* BSDTIMES */
	    (void) gettimeofday(&pp->p_etime, NULL);
#endif /* BSDTIMES */


#if defined(BSDTIMES) || defined(_SEQUENT_)
	pp->p_rusage = ru;
#else /* !BSDTIMES && !_SEQUENT_ */
	(void) times(&proctimes);
	pp->p_utime = proctimes.tms_cutime - shtimes.tms_cutime;
	pp->p_stime = proctimes.tms_cstime - shtimes.tms_cstime;
	shtimes = proctimes;
#endif /* !BSDTIMES && !_SEQUENT_ */
	if (WIFSIGNALED(w)) {
	    if (WTERMSIG(w) == SIGINT)
		pp->p_flags |= PINTERRUPTED;
	    else
		pp->p_flags |= PSIGNALED;
	    if (WCOREDUMP(w))
		pp->p_flags |= PDUMPED;
	    pp->p_reason = WTERMSIG(w);
	}
	else {
	    pp->p_reason = WEXITSTATUS(w);
	    if (pp->p_reason != 0)
		pp->p_flags |= PAEXITED;
	    else
		pp->p_flags |= PNEXITED;
	}
    }
    jobflags = 0;
    fp = pp;
    do {
	if ((fp->p_flags & (PPTIME | PRUNNING | PSTOPPED)) == 0 &&
	    !child && adrof(STRtime) &&
#ifdef BSDTIMES
	    fp->p_rusage.ru_utime.tv_sec + fp->p_rusage.ru_stime.tv_sec
#else /* !BSDTIMES */
# ifdef _SEQUENT_
	    fp->p_rusage.ps_utime.tv_sec + fp->p_rusage.ps_stime.tv_sec
# else /* !_SEQUENT_ */
#  ifndef POSIX
	    (fp->p_utime + fp->p_stime) / HZ
#  else /* POSIX */
	    (fp->p_utime + fp->p_stime) / clk_tck
#  endif /* POSIX */
# endif /* !_SEQUENT_ */
#endif /* !BSDTIMES */
	    >= atoi(short2str(varval(STRtime))))
	    fp->p_flags |= PTIME;
	jobflags |= fp->p_flags;
    } while ((fp = fp->p_friends) != pp);
    pp->p_flags &= ~PFOREGND;
    if (pp == pp->p_friends && (pp->p_flags & PPTIME)) {
	pp->p_flags &= ~PPTIME;
	pp->p_flags |= PTIME;
    }
    if ((jobflags & (PRUNNING | PREPORTED)) == 0) {
	fp = pp;
	do {
	    if (fp->p_flags & PSTOPPED)
		fp->p_flags |= PREPORTED;
	} while ((fp = fp->p_friends) != pp);
	while (fp->p_procid != fp->p_jobid)
	    fp = fp->p_friends;
	if (jobflags & PSTOPPED) {
	    if (pcurrent && pcurrent != fp)
		pprevious = pcurrent;
	    pcurrent = fp;
	}
	else
	    pclrcurr(fp);
	if (jobflags & PFOREGND) {
	    if (!(jobflags & (PSIGNALED | PSTOPPED | PPTIME) ||
#ifdef notdef
		jobflags & PAEXITED ||
#endif /* notdef */
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		fp->p_cwd == NULL ||
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		!eq(dcwd->di_name, fp->p_cwd->di_name))) {
	    /* PWP: print a newline after ^C */
		if (jobflags & PINTERRUPTED) {
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		    xputchar('\r' | QUOTE);
		    xputchar('\n');
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		}
#ifdef notdef
		else if ((jobflags & (PTIME|PSTOPPED)) == PTIME)
		    ptprint(fp);
#endif /* notdef */
	    }
	}
	else {
	    if (jobflags & PNOTIFY || adrof(STRnotify)) {
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	        xputchar('\r' | QUOTE);
		xputchar('\n');
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		(void) pprint(pp, NUMBER | NAME | REASON);
		if ((jobflags & PSTOPPED) == 0)
		    pflush(pp);
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		if (GettingInput) {
		    errno = 0;
		    (void) Rawmode();
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#ifdef notdef
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		    /*
		     * don't really want to do that, because it
		     * will erase our message in case of multi-line
		     * input
		     */
		    ClearLines();
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#endif /* notdef */
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		    ClearDisp();
		    Refresh();
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		}
	    }
	    else {
		fp->p_flags |= PNEEDNOTE;
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		neednote = 1;
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	    }
	}
    }
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#if defined(BSDJOBS) || defined(HAVEwait3) ||defined(WINNT_NATIVE)
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    goto loop;
#endif /* BSDJOBS || HAVEwait3 */
 end:
    ;
}

void
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pnote(void)
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{
    struct process *pp;
    int     flags;

    neednote = 0;
    for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) {
	if (pp->p_flags & PNEEDNOTE) {
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	    pchild_disabled++;
	    cleanup_push(&pchild_disabled, disabled_cleanup);
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	    pp->p_flags &= ~PNEEDNOTE;
	    flags = pprint(pp, NUMBER | NAME | REASON);
	    if ((flags & (PRUNNING | PSTOPPED)) == 0)
		pflush(pp);
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	    cleanup_until(&pchild_disabled);
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	}
    }
}


static void
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pfree(struct process *pp)
450
{	
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    xfree(pp->p_command);
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    if (pp->p_cwd && --pp->p_cwd->di_count == 0)
	if (pp->p_cwd->di_next == 0)
	    dfree(pp->p_cwd);
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    xfree(pp);
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}


/*
 * pwait - wait for current job to terminate, maintaining integrity
 *	of current and previous job indicators.
 */
void
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pwait(void)
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{
    struct process *fp, *pp;

    /*
     * Here's where dead procs get flushed.
     */
    for (pp = (fp = &proclist)->p_next; pp != NULL; pp = (fp = pp)->p_next)
	if (pp->p_procid == 0) {
	    fp->p_next = pp->p_next;
	    pfree(pp);
	    pp = fp;
	}
    pjwait(pcurrjob);
}


/*
 * pjwait - wait for a job to finish or become stopped
 *	It is assumed to be in the foreground state (PFOREGND)
 */
void
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pjwait(struct process *pp)
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{
    struct process *fp;
    int     jobflags, reason;
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    sigset_t oset, set, pause_mask;
    Char *reason_str;

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    while (pp->p_procid != pp->p_jobid)
	pp = pp->p_friends;
    fp = pp;

    do {
	if ((fp->p_flags & (PFOREGND | PRUNNING)) == PRUNNING)
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	  xprintf("%s", CGETS(17, 1, "BUG: waiting for background job!\n"));
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    } while ((fp = fp->p_friends) != pp);
    /*
     * Now keep pausing as long as we are not interrupted (SIGINT), and the
     * target process, or any of its friends, are running
     */
    fp = pp;
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    sigemptyset(&set);
    sigaddset(&set, SIGINT);
    sigaddset(&set, SIGCHLD);
    (void)sigprocmask(SIG_BLOCK, &set, &oset);
    cleanup_push(&oset, sigprocmask_cleanup);
    pause_mask = oset;
    sigdelset(&pause_mask, SIGCHLD);
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    sigaddset(&pause_mask, SIGINT);
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    for (;;) {
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	(void)handle_pending_signals();
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	jobflags = 0;
	do
	    jobflags |= fp->p_flags;
	while ((fp = (fp->p_friends)) != pp);
	if ((jobflags & PRUNNING) == 0)
	    break;
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	jobdebug_xprintf(("%d starting to sigsuspend for SIGCHLD on %d\n",
			  getpid(), fp->p_procid));
	sigsuspend(&pause_mask);
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    }
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    cleanup_until(&oset);
    jobdebug_xprintf(("%d returned from sigsuspend loop\n", getpid()));
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#ifdef BSDJOBS
    if (tpgrp > 0)		/* get tty back */
	(void) tcsetpgrp(FSHTTY, tpgrp);
#endif /* BSDJOBS */
    if ((jobflags & (PSIGNALED | PSTOPPED | PTIME)) ||
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	fp->p_cwd == NULL || !eq(dcwd->di_name, fp->p_cwd->di_name)) {
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	if (jobflags & PSTOPPED) {
	    xputchar('\n');
	    if (adrof(STRlistjobs)) {
		Char   *jobcommand[3];

		jobcommand[0] = STRjobs;
		if (eq(varval(STRlistjobs), STRlong))
		    jobcommand[1] = STRml;
		else
		    jobcommand[1] = NULL;
		jobcommand[2] = NULL;

		dojobs(jobcommand, NULL);
		(void) pprint(pp, SHELLDIR);
	    }
	    else
		(void) pprint(pp, AREASON | SHELLDIR);
	}
	else
	    (void) pprint(pp, AREASON | SHELLDIR);
    }
    if ((jobflags & (PINTERRUPTED | PSTOPPED)) && setintr &&
	(!gointr || !eq(gointr, STRminus))) {
	if ((jobflags & PSTOPPED) == 0)
	    pflush(pp);
	pintr1(0);
	/* NOTREACHED */
    }
    reason = 0;
    fp = pp;
    do {
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	/* In case of pipelines only the result of the last
	 * command should be taken in account */
	if (!anyerror && !(fp->p_flags & PBRACE)
		&& ((fp->p_flags & PPOU) || (fp->p_flags & PBACKQ)))
	    continue;
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	if (fp->p_reason)
	    reason = fp->p_flags & (PSIGNALED | PINTERRUPTED) ?
		fp->p_reason | META : fp->p_reason;
    } while ((fp = fp->p_friends) != pp);
    /*
     * Don't report on backquoted jobs, cause it will mess up 
     * their output.
     */
    if ((reason != 0) && (adrof(STRprintexitvalue)) && 
	(pp->p_flags & PBACKQ) == 0)
	xprintf(CGETS(17, 2, "Exit %d\n"), reason);
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    reason_str = putn((tcsh_number_t)reason);
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    cleanup_push(reason_str, xfree);
    setv(STRstatus, reason_str, VAR_READWRITE);
    cleanup_ignore(reason_str);
    cleanup_until(reason_str);
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    if (reason && exiterr)
	exitstat();
    pflush(pp);
}

/*
 * dowait - wait for all processes to finish
 */

/*ARGSUSED*/
void
597
dowait(Char **v, struct command *c)
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{
    struct process *pp;
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    /* the current block mask to be able to restore */
    sigset_t old_mask;

    /* block mask for critical section: OLD_MASK U {SIGCHLD} */
    sigset_t block_mask;

    /* ignore those during blocking sigsuspend:
       OLD_MASK / {SIGCHLD, possibly(SIGINT)} */
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    sigset_t pause_mask;
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    int opintr_disabled, gotsig;
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    USE(c);
    USE(v);
    pjobs++;
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    sigprocmask(SIG_BLOCK, NULL, &pause_mask);
    sigdelset(&pause_mask, SIGCHLD);
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    if (setintr)
620
	sigdelset(&pause_mask, SIGINT);
621 622 623 624 625 626 627 628 629

    /* critical section, block also SIGCHLD */
    sigprocmask(SIG_BLOCK, NULL, &block_mask);
    sigaddset(&block_mask, SIGCHLD);
    sigprocmask(SIG_BLOCK, &block_mask, &old_mask);

    /* detect older SIGCHLDs and remove PRUNNING flag from proclist */
    (void)handle_pending_signals();

630 631 632 633
loop:
    for (pp = proclist.p_next; pp; pp = pp->p_next)
	if (pp->p_procid &&	/* pp->p_procid == pp->p_jobid && */
	    pp->p_flags & PRUNNING) {
634
	    /* wait for (or pick up alredy blocked) SIGCHLD */
635
	    sigsuspend(&pause_mask);
636 637

	    /* make the 'wait' interuptable by CTRL-C */
638 639 640 641 642
	    opintr_disabled = pintr_disabled;
	    pintr_disabled = 0;
	    gotsig = handle_pending_signals();
	    pintr_disabled = opintr_disabled;
	    if (gotsig)
643
		break;
644 645 646
	    goto loop;
	}
    pjobs = 0;
647 648

    sigprocmask(SIG_SETMASK, &old_mask, NULL);
649 650 651 652 653 654
}

/*
 * pflushall - flush all jobs from list (e.g. at fork())
 */
static void
655
pflushall(void)
656 657 658 659 660 661 662 663 664 665 666 667 668 669
{
    struct process *pp;

    for (pp = proclist.p_next; pp != NULL; pp = pp->p_next)
	if (pp->p_procid)
	    pflush(pp);
}

/*
 * pflush - flag all process structures in the same job as the
 *	the argument process for deletion.  The actual free of the
 *	space is not done here since pflush is called at interrupt level.
 */
static void
670
pflush(struct process *pp)
671 672 673 674 675
{
    struct process *np;
    int idx;

    if (pp->p_procid == 0) {
676
	xprintf("%s", CGETS(17, 3, "BUG: process flushed twice"));
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702
	return;
    }
    while (pp->p_procid != pp->p_jobid)
	pp = pp->p_friends;
    pclrcurr(pp);
    if (pp == pcurrjob)
	pcurrjob = 0;
    idx = pp->p_index;
    np = pp;
    do {
	np->p_index = np->p_procid = 0;
	np->p_flags &= ~PNEEDNOTE;
    } while ((np = np->p_friends) != pp);
    if (idx == pmaxindex) {
	for (np = proclist.p_next, idx = 0; np; np = np->p_next)
	    if (np->p_index > idx)
		idx = np->p_index;
	pmaxindex = idx;
    }
}

/*
 * pclrcurr - make sure the given job is not the current or previous job;
 *	pp MUST be the job leader
 */
static void
703
pclrcurr(struct process *pp)
704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719
{
    if (pp == pcurrent) {
	if (pprevious != NULL) {
	    pcurrent = pprevious;
	    pprevious = pgetcurr(pp);
	}
	else {
	    pcurrent = pgetcurr(pp);
	    pprevious = pgetcurr(pp);
	}
    }
    else if (pp == pprevious)
	pprevious = pgetcurr(pp);
}

/* +4 here is 1 for '\0', 1 ea for << >& >> */
720 721
static Char *cmdstr;
static size_t cmdmax;
722
static size_t cmdlen;
723
static Char *cmdp;
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738
#define CMD_INIT 1024
#define CMD_INCR 64

static void
morecommand(size_t s)
{
    Char *ncmdstr;
    ptrdiff_t d;

    cmdmax += s;
    ncmdstr = xrealloc(cmdstr, cmdmax * sizeof(*cmdstr));
    d = ncmdstr - cmdstr;
    cmdstr = ncmdstr;
    cmdp += d;
}
739 740 741 742 743

/* GrP
 * unparse - Export padd() functionality 
 */
Char *
744
unparse(struct command *t)
745
{
746 747 748
    if (cmdmax == 0)
	morecommand(CMD_INIT);
    cmdp = cmdstr;
749 750 751
    cmdlen = 0;
    padd(t);
    *cmdp++ = '\0';
752
    return Strsave(cmdstr);
753 754 755 756 757 758 759 760
}


/*
 * palloc - allocate a process structure and fill it up.
 *	an important assumption is made that the process is running.
 */
void
761
palloc(pid_t pid, struct command *t)
762 763 764 765
{
    struct process *pp;
    int     i;

766
    pp = xcalloc(1, sizeof(struct process));
767
    pp->p_procid = pid;
768
    pp->p_parentid = shpgrp;
769 770 771 772 773 774 775
    pp->p_flags = ((t->t_dflg & F_AMPERSAND) ? 0 : PFOREGND) | PRUNNING;
    if (t->t_dflg & F_TIME)
	pp->p_flags |= PPTIME;
    if (t->t_dflg & F_BACKQ)
	pp->p_flags |= PBACKQ;
    if (t->t_dflg & F_HUP)
	pp->p_flags |= PHUP;
776 777
    if (t->t_dcom && t->t_dcom[0] && (*t->t_dcom[0] == '{'))
	pp->p_flags |= PBRACE;
778 779 780
    if (cmdmax == 0)
	morecommand(CMD_INIT);
    cmdp = cmdstr;
781 782 783 784 785 786 787 788
    cmdlen = 0;
    padd(t);
    *cmdp++ = 0;
    if (t->t_dflg & F_PIPEOUT) {
	pp->p_flags |= PPOU;
	if (t->t_dflg & F_STDERR)
	    pp->p_flags |= PDIAG;
    }
789
    pp->p_command = Strsave(cmdstr);
790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
    if (pcurrjob) {
	struct process *fp;

	/* careful here with interrupt level */
	pp->p_cwd = 0;
	pp->p_index = pcurrjob->p_index;
	pp->p_friends = pcurrjob;
	pp->p_jobid = pcurrjob->p_procid;
	for (fp = pcurrjob; fp->p_friends != pcurrjob; fp = fp->p_friends)
	    continue;
	fp->p_friends = pp;
    }
    else {
	pcurrjob = pp;
	pp->p_jobid = pid;
	pp->p_friends = pp;
	pp->p_cwd = dcwd;
	dcwd->di_count++;
	if (pmaxindex < BIGINDEX)
	    pp->p_index = ++pmaxindex;
	else {
	    struct process *np;

	    for (i = 1;; i++) {
		for (np = proclist.p_next; np; np = np->p_next)
		    if (np->p_index == i)
			goto tryagain;
		pp->p_index = i;
		if (i > pmaxindex)
		    pmaxindex = i;
		break;
	tryagain:;
	    }
	}
	if (pcurrent == NULL)
	    pcurrent = pp;
	else if (pprevious == NULL)
	    pprevious = pp;
    }
    pp->p_next = proclist.p_next;
    proclist.p_next = pp;
#ifdef BSDTIMES
    (void) gettimeofday(&pp->p_btime, NULL);
#else /* !BSDTIMES */
# ifdef _SEQUENT_
    (void) get_process_stats(&pp->p_btime, PS_SELF, NULL, NULL);
# else /* !_SEQUENT_ */
    {
	struct tms tmptimes;

	pp->p_btime = times(&tmptimes);
    }
# endif /* !_SEQUENT_ */
#endif /* !BSDTIMES */
}

static void
847
padd(struct command *t)
848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909
{
    Char  **argp;

    if (t == 0)
	return;
    switch (t->t_dtyp) {

    case NODE_PAREN:
	pads(STRLparensp);
	padd(t->t_dspr);
	pads(STRspRparen);
	break;

    case NODE_COMMAND:
	for (argp = t->t_dcom; *argp; argp++) {
	    pads(*argp);
	    if (argp[1])
		pads(STRspace);
	}
	break;

    case NODE_OR:
    case NODE_AND:
    case NODE_PIPE:
    case NODE_LIST:
	padd(t->t_dcar);
	switch (t->t_dtyp) {
	case NODE_OR:
	    pads(STRspor2sp);
	    break;
	case NODE_AND:
	    pads(STRspand2sp);
	    break;
	case NODE_PIPE:
	    pads(STRsporsp);
	    break;
	case NODE_LIST:
	    pads(STRsemisp);
	    break;
	default:
	    break;
	}
	padd(t->t_dcdr);
	return;

    default:
	break;
    }
    if ((t->t_dflg & F_PIPEIN) == 0 && t->t_dlef) {
	pads((t->t_dflg & F_READ) ? STRspLarrow2sp : STRspLarrowsp);
	pads(t->t_dlef);
    }
    if ((t->t_dflg & F_PIPEOUT) == 0 && t->t_drit) {
	pads((t->t_dflg & F_APPEND) ? STRspRarrow2 : STRspRarrow);
	if (t->t_dflg & F_STDERR)
	    pads(STRand);
	pads(STRspace);
	pads(t->t_drit);
    }
}

static void
910
pads(Char *cp)
911
{
912
    size_t i, len;
913 914 915 916 917 918 919 920

    /*
     * Avoid the Quoted Space alias hack! Reported by:
     * sam@john-bigboote.ICS.UCI.EDU (Sam Horrocks)
     */
    if (cp[0] == STRQNULL[0])
	cp++;

921
    i = Strlen(cp);
922

923 924 925
    len = cmdlen + i + CMD_INCR;
    if (len >= cmdmax)
	morecommand(len);
926 927 928 929 930 931 932 933 934 935 936
    (void) Strcpy(cmdp, cp);
    cmdp += i;
    cmdlen += i;
}

/*
 * psavejob - temporarily save the current job on a one level stack
 *	so another job can be created.  Used for { } in exp6
 *	and `` in globbing.
 */
void
937
psavejob(void)
938 939 940 941 942 943
{
    pholdjob = pcurrjob;
    pcurrjob = NULL;
}

void
944
psavejob_cleanup(void *dummy)
945
{
946
    USE(dummy);
947 948 949 950 951 952 953 954 955
    pcurrjob = pholdjob;
    pholdjob = NULL;
}

/*
 * pendjob - indicate that a job (set of commands) has been completed
 *	or is about to begin.
 */
void
956
pendjob(void)
957 958 959 960 961
{
    struct process *pp, *tp;

    if (pcurrjob && (pcurrjob->p_flags & (PFOREGND | PSTOPPED)) == 0) {
	pp = pcurrjob;
962
	pcurrjob = NULL;
963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987
	while (pp->p_procid != pp->p_jobid)
	    pp = pp->p_friends;
	xprintf("[%d]", pp->p_index);
	tp = pp;
	do {
	    xprintf(" %d", pp->p_procid);
	    pp = pp->p_friends;
	} while (pp != tp);
	xputchar('\n');
    }
    pholdjob = pcurrjob = 0;
}

/*
 * pprint - print a job
 */

/*
 * Hacks have been added for SVR4 to deal with pipe's being spawned in
 * reverse order
 *
 * David Dawes (dawes@physics.su.oz.au) Oct 1991
 */

static int
988
pprint(struct process *pp, int flag)
989 990 991 992 993
{
    int status, reason;
    struct process *tp;
    int     jobflags, pstatus, pcond;
    const char *format;
994
    int ohaderr;
995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009

#ifdef BACKPIPE
    struct process *pipehead = NULL, *pipetail = NULL, *pmarker = NULL;
    int inpipe = 0;
#endif /* BACKPIPE */

    while (pp->p_procid != pp->p_jobid)
	pp = pp->p_friends;
    if (pp == pp->p_friends && (pp->p_flags & PPTIME)) {
	pp->p_flags &= ~PPTIME;
	pp->p_flags |= PTIME;
    }
    tp = pp;
    status = reason = -1;
    jobflags = 0;
1010 1011 1012
    ohaderr = haderr;
    /* Print status to stderr, except for jobs built-in */
    haderr = !(flag & JOBLIST);
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
    do {
#ifdef BACKPIPE
	/*
	 * The pipeline is reversed, so locate the real head of the pipeline
	 * if pp is at the tail of a pipe (and not already in a pipeline)
	 */
	if ((pp->p_friends->p_flags & PPOU) && !inpipe && (flag & NAME)) {
	    inpipe = 1;
	    pipetail = pp;
	    do 
		pp = pp->p_friends;
	    while (pp->p_friends->p_flags & PPOU);
	    pipehead = pp;
	    pmarker = pp;
	/*
	 * pmarker is used to hold the place of the proc being processed, so
	 * we can search for the next one downstream later.
	 */
	}
1032
	pcond = (tp != pp || (inpipe && tp == pp));
1033
#else /* !BACKPIPE */
1034
	pcond = (tp != pp);
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
#endif /* BACKPIPE */	    

	jobflags |= pp->p_flags;
	pstatus = (int) (pp->p_flags & PALLSTATES);
	if (pcond && linp != linbuf && !(flag & FANCY) &&
	    ((pstatus == status && pp->p_reason == reason) ||
	     !(flag & REASON)))
	    xputchar(' ');
	else {
	    if (pcond && linp != linbuf)
		xputchar('\n');
	    if (flag & NUMBER) {
#ifdef BACKPIPE
		pcond = ((pp == tp && !inpipe) ||
			 (inpipe && pipetail == tp && pp == pipehead));
#else /* BACKPIPE */
		pcond = (pp == tp);
#endif /* BACKPIPE */
		if (pcond)
		    xprintf("[%d]%s %c ", pp->p_index,
			    pp->p_index < 10 ? " " : "",
			    pp == pcurrent ? '+' :
			    (pp == pprevious ? '-' : ' '));
		else
		    xprintf("       ");
	    }
	    if (flag & FANCY) {
		xprintf("%5d ", pp->p_procid);
#ifdef TCF
		xprintf("%11s ", sitename(pp->p_procid));
#endif /* TCF */
	    }
	    if (flag & (REASON | AREASON)) {
		if (flag & NAME)
		    format = "%-30s";
		else
		    format = "%s";
		if (pstatus == status) {
		    if (pp->p_reason == reason) {
			xprintf(format, "");
			goto prcomd;
		    }
		    else
			reason = (int) pp->p_reason;
		}
		else {
		    status = pstatus;
		    reason = (int) pp->p_reason;
		}
		switch (status) {

		case PRUNNING:
		    xprintf(format, CGETS(17, 4, "Running "));
		    break;

		case PINTERRUPTED:
		case PSTOPPED:
		case PSIGNALED:
		    /*
		     * tell what happened to the background job
1095
		     * From: Michael Schroeder
1096 1097 1098 1099 1100 1101 1102
		     * <mlschroe@immd4.informatik.uni-erlangen.de>
		     */
		    if ((flag & REASON)
			|| ((flag & AREASON)
			    && reason != SIGINT
			    && (reason != SIGPIPE
				|| (pp->p_flags & PPOU) == 0))) {
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
			char *ptr;
			int free_ptr;

			free_ptr = 0;
			ptr = (char *)(intptr_t)mesg[pp->p_reason & 0177].pname;
			if (ptr == NULL) {
			    ptr = xasprintf("%s %d", CGETS(17, 5, "Signal"),
					    pp->p_reason & 0177);
			    cleanup_push(ptr, xfree);
			    free_ptr = 1;
1113 1114
			}
			xprintf(format, ptr);
1115 1116
			if (free_ptr != 0)
			    cleanup_until(ptr);
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146
		    }
		    else
			reason = -1;
		    break;

		case PNEXITED:
		case PAEXITED:
		    if (flag & REASON) {
			if (pp->p_reason)
			    xprintf(CGETS(17, 6, "Exit %-25d"), pp->p_reason);
			else
			    xprintf(format, CGETS(17, 7, "Done"));
		    }
		    break;

		default:
		    xprintf(CGETS(17, 8, "BUG: status=%-9o"),
			    status);
		}
	    }
	}
prcomd:
	if (flag & NAME) {
	    xprintf("%S", pp->p_command);
	    if (pp->p_flags & PPOU)
		xprintf(" |");
	    if (pp->p_flags & PDIAG)
		xprintf("&");
	}
	if (flag & (REASON | AREASON) && pp->p_flags & PDUMPED)
1147
	    xprintf("%s", CGETS(17, 9, " (core dumped)"));
1148 1149 1150 1151 1152
	if (tp == pp->p_friends) {
	    if (flag & AMPERSAND)
		xprintf(" &");
	    if (flag & JOBDIR &&
		!eq(tp->p_cwd->di_name, dcwd->di_name)) {
1153
		xprintf("%s", CGETS(17, 10, " (wd: "));
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
		dtildepr(tp->p_cwd->di_name);
		xprintf(")");
	    }
	}
	if (pp->p_flags & PPTIME && !(status & (PSTOPPED | PRUNNING))) {
	    if (linp != linbuf)
		xprintf("\n\t");
#if defined(BSDTIMES) || defined(_SEQUENT_)
	    prusage(&zru, &pp->p_rusage, &pp->p_etime,
		    &pp->p_btime);
#else /* !BSDTIMES && !SEQUENT */
	    lru.tms_utime = pp->p_utime;
	    lru.tms_stime = pp->p_stime;
	    lru.tms_cutime = 0;
	    lru.tms_cstime = 0;
	    prusage(&zru, &lru, pp->p_etime,
		    pp->p_btime);
#endif /* !BSDTIMES && !SEQUENT */

	}
#ifdef BACKPIPE
	pcond = ((tp == pp->p_friends && !inpipe) ||
		 (inpipe && pipehead->p_friends == tp && pp == pipetail));
#else  /* !BACKPIPE */
	pcond = (tp == pp->p_friends);
#endif /* BACKPIPE */
	if (pcond) {
	    if (linp != linbuf)
		xputchar('\n');
	    if (flag & SHELLDIR && !eq(tp->p_cwd->di_name, dcwd->di_name)) {
1184
		xprintf("%s", CGETS(17, 11, "(wd now: "));
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
		dtildepr(dcwd->di_name);
		xprintf(")\n");
	    }
	}
#ifdef BACKPIPE
	if (inpipe) {
	    /*
	     * if pmaker == pipetail, we are finished that pipeline, and
	     * can now skip to past the head
	     */
	    if (pmarker == pipetail) {
		inpipe = 0;
		pp = pipehead;
	    }
	    else {
	    /*
	     * set pp to one before the one we want next, so the while below
	     * increments to the correct spot.
	     */
		do
		    pp = pp->p_friends;
	    	while (pp->p_friends->p_friends != pmarker);
	    	pmarker = pp->p_friends;
	    }
	}
	pcond = ((pp = pp->p_friends) != tp || inpipe);
#else /* !BACKPIPE */
	pcond = ((pp = pp->p_friends) != tp);
#endif /* BACKPIPE */
    } while (pcond);

    if (jobflags & PTIME && (jobflags & (PSTOPPED | PRUNNING)) == 0) {
	if (jobflags & NUMBER)
	    xprintf("       ");
	ptprint(tp);
    }
1221
    haderr = ohaderr;
1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
    return (jobflags);
}

/*
 * All 4.3 BSD derived implementations are buggy and I've had enough.
 * The following implementation produces similar code and works in all
 * cases. The 4.3BSD one works only for <, >, !=
 */
# undef timercmp
#  define timercmp(tvp, uvp, cmp) \
      (((tvp)->tv_sec == (uvp)->tv_sec) ? \
	   ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
	   ((tvp)->tv_sec  cmp (uvp)->tv_sec))

static void
1237
ptprint(struct process *tp)
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
{
#ifdef BSDTIMES
    struct timeval tetime, diff;
    static struct timeval ztime;
    struct sysrusage ru;
    struct process *pp = tp;

    ru = zru;
    tetime = ztime;
    do {
	ruadd(&ru, &pp->p_rusage);
	tvsub(&diff, &pp->p_etime, &pp->p_btime);
	if (timercmp(&diff, &tetime, >))
	    tetime = diff;
    } while ((pp = pp->p_friends) != tp);
    prusage(&zru, &ru, &tetime, &ztime);
#else /* !BSDTIMES */
# ifdef _SEQUENT_
    timeval_t tetime, diff;
    static timeval_t ztime;
    struct process_stats ru;
    struct process *pp = tp;

    ru = zru;
    tetime = ztime;
    do {
	ruadd(&ru, &pp->p_rusage);
	tvsub(&diff, &pp->p_etime, &pp->p_btime);
	if (timercmp(&diff, &tetime, >))
	    tetime = diff;
    } while ((pp = pp->p_friends) != tp);
    prusage(&zru, &ru, &tetime, &ztime);
# else /* !_SEQUENT_ */
#  ifndef POSIX
    static time_t ztime = 0;
    static time_t zu_time = 0;
    static time_t zs_time = 0;
    time_t  tetime, diff;
    time_t  u_time, s_time;

#  else	/* POSIX */
    static clock_t ztime = 0;
    static clock_t zu_time = 0;
    static clock_t zs_time = 0;
    clock_t tetime, diff;
    clock_t u_time, s_time;

#  endif /* POSIX */
    struct tms zts, rts;
    struct process *pp = tp;

    u_time = zu_time;
    s_time = zs_time;
    tetime = ztime;
    do {
	u_time += pp->p_utime;
	s_time += pp->p_stime;
	diff = pp->p_etime - pp->p_btime;
	if (diff > tetime)
	    tetime = diff;
    } while ((pp = pp->p_friends) != tp);
    zts.tms_utime = zu_time;
    zts.tms_stime = zs_time;
    zts.tms_cutime = 0;
    zts.tms_cstime = 0;
    rts.tms_utime = u_time;
    rts.tms_stime = s_time;
    rts.tms_cutime = 0;
    rts.tms_cstime = 0;
    prusage(&zts, &rts, tetime, ztime);
# endif /* !_SEQUENT_ */
#endif	/* !BSDTIMES */
}

/*
 * dojobs - print all jobs
 */
/*ARGSUSED*/
void
1317
dojobs(Char **v, struct command *c)
1318 1319
{
    struct process *pp;
1320
    int flag = NUMBER | NAME | REASON | JOBLIST;
1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345
    int     i;

    USE(c);
    if (chkstop)
	chkstop = 2;
    if (*++v) {
	if (v[1] || !eq(*v, STRml))
	    stderror(ERR_JOBS);
	flag |= FANCY | JOBDIR;
    }
    for (i = 1; i <= pmaxindex; i++)
	for (pp = proclist.p_next; pp; pp = pp->p_next)
	    if (pp->p_index == i && pp->p_procid == pp->p_jobid) {
		pp->p_flags &= ~PNEEDNOTE;
		if (!(pprint(pp, flag) & (PRUNNING | PSTOPPED)))
		    pflush(pp);
		break;
	    }
}

/*
 * dofg - builtin - put the job into the foreground
 */
/*ARGSUSED*/
void
1346
dofg(Char **v, struct command *c)
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368
{
    struct process *pp;

    USE(c);
    okpcntl();
    ++v;
    do {
	pp = pfind(*v);
	if (!pstart(pp, 1)) {
	    pp->p_procid = 0;
	    stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno));
	    continue;
	}
	pjwait(pp);
    } while (*v && *++v);
}

/*
 * %... - builtin - put the job into the foreground
 */
/*ARGSUSED*/
void
1369
dofg1(Char **v, struct command *c)
1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388
{
    struct process *pp;

    USE(c);
    okpcntl();
    pp = pfind(v[0]);
    if (!pstart(pp, 1)) {
	pp->p_procid = 0;
	stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno));
	return;
    }
    pjwait(pp);
}

/*
 * dobg - builtin - put the job into the background
 */
/*ARGSUSED*/
void
1389
dobg(Char **v, struct command *c)
1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
{
    struct process *pp;

    USE(c);
    okpcntl();
    ++v;
    do {
	pp = pfind(*v);
	if (!pstart(pp, 0)) {
	    pp->p_procid = 0;
	    stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno));
	}
    } while (*v && *++v);
}

/*
 * %... & - builtin - put the job into the background
 */
/*ARGSUSED*/
void
1410
dobg1(Char **v, struct command *c)
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
{
    struct process *pp;

    USE(c);
    pp = pfind(v[0]);
    if (!pstart(pp, 0)) {
	pp->p_procid = 0;
	stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno));
    }
}

/*
 * dostop - builtin - stop the job
 */
/*ARGSUSED*/
void
1427
dostop(Char **v, struct command *c)
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439
{
    USE(c);
#ifdef BSDJOBS
    pkill(++v, SIGSTOP);
#endif /* BSDJOBS */
}

/*
 * dokill - builtin - superset of kill (1)
 */
/*ARGSUSED*/
void
1440
dokill(Char **v, struct command *c)
1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
{
    int signum, len = 0;
    const char *name;
    Char *sigptr;

    USE(c);
    v++;
    if (v[0] && v[0][0] == '-') {
	if (v[0][1] == 'l') {
	    for (signum = 0; signum <= nsig; signum++) {
		if ((name = mesg[signum].iname) != NULL) {
		    len += strlen(name) + 1;
1453
		    if (len >= TermH - 1) {
1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494
			xputchar('\n');
			len = strlen(name) + 1;
		    }
		    xprintf("%s ", name);
		}
	    }
	    xputchar('\n');
	    return;
	}
 	sigptr = &v[0][1];
 	if (v[0][1] == 's') {
 	    if (v[1]) {
 		v++;
 		sigptr = &v[0][0];
 	    } else {
 		stderror(ERR_NAME | ERR_TOOFEW);
 	    }
 	}
 	if (Isdigit(*sigptr)) {
	    char *ep;
 	    signum = strtoul(short2str(sigptr), &ep, 0);
	    if (*ep || signum < 0 || signum > (MAXSIG-1))
		stderror(ERR_NAME | ERR_BADSIG);
	}
	else {
	    for (signum = 0; signum <= nsig; signum++)
		if (mesg[signum].iname &&
 		    eq(sigptr, str2short(mesg[signum].iname)))
		    goto gotsig;
 	    setname(short2str(sigptr));
	    stderror(ERR_NAME | ERR_UNKSIG);
	}
gotsig:
	v++;
    }
    else
	signum = SIGTERM;
    pkill(v, signum);
}

static void
1495
pkill(Char **v, int signum)
1496 1497 1498 1499
{
    struct process *pp, *np;
    int jobflags = 0, err1 = 0;
    pid_t     pid;
1500
    Char *cp, **vp, **globbed;
1501 1502 1503 1504 1505 1506

    /* Avoid globbing %?x patterns */
    for (vp = v; vp && *vp; vp++)
	if (**vp == '%')
	    (void) quote(*vp);

1507 1508 1509
    v = glob_all_or_error(v);
    globbed = v;
    cleanup_push(globbed, blk_cleanup);
1510

1511 1512 1513 1514 1515 1516
    pchild_disabled++;
    cleanup_push(&pchild_disabled, disabled_cleanup);
    if (setintr) {
	pintr_disabled++;
	cleanup_push(&pintr_disabled, disabled_cleanup);
    }
1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588

    while (v && (cp = *v)) {
	if (*cp == '%') {
	    np = pp = pfind(cp);
	    do
		jobflags |= np->p_flags;
	    while ((np = np->p_friends) != pp);
#ifdef BSDJOBS
	    switch (signum) {

	    case SIGSTOP:
	    case SIGTSTP:
	    case SIGTTIN:
	    case SIGTTOU:
		if ((jobflags & PRUNNING) == 0) {
# ifdef SUSPENDED
		    xprintf(CGETS(17, 12, "%S: Already suspended\n"), cp);
# else /* !SUSPENDED */
		    xprintf(CGETS(17, 13, "%S: Already stopped\n"), cp);
# endif /* !SUSPENDED */
		    err1++;
		    goto cont;
		}
		break;
		/*
		 * suspend a process, kill -CONT %, then type jobs; the shell
		 * says it is suspended, but it is running; thanks jaap..
		 */
	    case SIGCONT:
		if (!pstart(pp, 0)) {
		    pp->p_procid = 0;
		    stderror(ERR_NAME|ERR_BADJOB, pp->p_command,
			     strerror(errno));
		}
		goto cont;
	    default:
		break;
	    }
#endif /* BSDJOBS */
	    if (killpg(pp->p_jobid, signum) < 0) {
		xprintf("%S: %s\n", cp, strerror(errno));
		err1++;
	    }
#ifdef BSDJOBS
	    if (signum == SIGTERM || signum == SIGHUP)
		(void) killpg(pp->p_jobid, SIGCONT);
#endif /* BSDJOBS */
	}
	else if (!(Isdigit(*cp) || *cp == '-'))
	    stderror(ERR_NAME | ERR_JOBARGS);
	else {
	    char *ep;
#ifndef WINNT_NATIVE
	    pid = strtol(short2str(cp), &ep, 10);
#else
	    pid = strtoul(short2str(cp), &ep, 0);
#endif /* WINNT_NATIVE */
	    if (*ep)
		stderror(ERR_NAME | ERR_JOBARGS);
	    else if (kill(pid, signum) < 0) {
		xprintf("%d: %s\n", pid, strerror(errno));
		err1++;
		goto cont;
	    }
#ifdef BSDJOBS
	    if (signum == SIGTERM || signum == SIGHUP)
		(void) kill(pid, SIGCONT);
#endif /* BSDJOBS */
	}
cont:
	v++;
    }
1589
    cleanup_until(&pchild_disabled);
1590 1591 1592 1593 1594 1595 1596 1597
    if (err1)
	stderror(ERR_SILENT);
}

/*
 * pstart - start the job in foreground/background
 */
int
1598
pstart(struct process *pp, int foregnd)
1599 1600 1601 1602 1603 1604
{
    int rv = 0;
    struct process *np;
    /* We don't use jobflags in this function right now (see below) */
    /* long    jobflags = 0; */

1605 1606
    pchild_disabled++;
    cleanup_push(&pchild_disabled, disabled_cleanup);
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640
    np = pp;
    do {
	/* We don't use jobflags in this function right now (see below) */
	/* jobflags |= np->p_flags; */
	if (np->p_flags & (PRUNNING | PSTOPPED)) {
	    np->p_flags |= PRUNNING;
	    np->p_flags &= ~PSTOPPED;
	    if (foregnd)
		np->p_flags |= PFOREGND;
	    else
		np->p_flags &= ~PFOREGND;
	}
    } while ((np = np->p_friends) != pp);
    if (!foregnd)
	pclrcurr(pp);
    (void) pprint(pp, foregnd ? NAME | JOBDIR : NUMBER | NAME | AMPERSAND);

    /* GrP run jobcmd hook if foregrounding */
    if (foregnd) {
	job_cmd(pp->p_command);
    }

#ifdef BSDJOBS
    if (foregnd) {
	rv = tcsetpgrp(FSHTTY, pp->p_jobid);
    }
    /*
     * 1. child process of csh (shell script) receives SIGTTIN/SIGTTOU
     * 2. parent process (csh) receives SIGCHLD
     * 3. The "csh" signal handling function pchild() is invoked
     *    with a SIGCHLD signal.
     * 4. pchild() calls wait3(WNOHANG) which returns 0.
     *    The child process is NOT ready to be waited for at this time.
     *    pchild() returns without picking-up the correct status
1641
     *    for the child process which generated the SIGCHLD.
1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655
     * 5. CONSEQUENCE : csh is UNaware that the process is stopped
     * 6. THIS LINE HAS BEEN COMMENTED OUT : if (jobflags&PSTOPPED)
     * 	  (beto@aixwiz.austin.ibm.com - aug/03/91)
     * 7. I removed the line completely and added extra checks for
     *    pstart, so that if a job gets attached to and dies inside
     *    a debugger it does not confuse the shell. [christos]
     * 8. on the nec sx-4 there seems to be a problem, which requires
     *    a syscall(151, getpid(), getpid()) in osinit. Don't ask me
     *    what this is doing. [schott@rzg.mpg.de]
     */

    if (rv != -1)
	rv = killpg(pp->p_jobid, SIGCONT);
#endif /* BSDJOBS */
1656
    cleanup_until(&pchild_disabled);
1657 1658 1659 1660
    return rv != -1;
}

void
1661
panystop(int neednl)
1662 1663 1664 1665 1666 1667 1668 1669 1670 1671
{
    struct process *pp;

    chkstop = 2;
    for (pp = proclist.p_next; pp; pp = pp->p_next)
	if (pp->p_flags & PSTOPPED)
	    stderror(ERR_STOPPED, neednl ? "\n" : "");
}

struct process *
1672
pfind(Char *cp)
1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725
{
    struct process *pp, *np;

    if (cp == 0 || cp[1] == 0 || eq(cp, STRcent2) || eq(cp, STRcentplus)) {
	if (pcurrent == NULL)
	    stderror(ERR_NAME | ERR_JOBCUR);
	return (pcurrent);
    }
    if (eq(cp, STRcentminus) || eq(cp, STRcenthash)) {
	if (pprevious == NULL)
	    stderror(ERR_NAME | ERR_JOBPREV);
	return (pprevious);
    }
    if (Isdigit(cp[1])) {
	int     idx = atoi(short2str(cp + 1));

	for (pp = proclist.p_next; pp; pp = pp->p_next)
	    if (pp->p_index == idx && pp->p_procid == pp->p_jobid)
		return (pp);
	stderror(ERR_NAME | ERR_NOSUCHJOB);
    }
    np = NULL;
    for (pp = proclist.p_next; pp; pp = pp->p_next)
	if (pp->p_procid == pp->p_jobid) {
	    if (cp[1] == '?') {
		Char *dp;

		for (dp = pp->p_command; *dp; dp++) {
		    if (*dp != cp[2])
			continue;
		    if (prefix(cp + 2, dp))
			goto match;
		}
	    }
	    else if (prefix(cp + 1, pp->p_command)) {
	match:
		if (np)
		    stderror(ERR_NAME | ERR_AMBIG);
		np = pp;
	    }
	}
    if (np)
	return (np);
    stderror(ERR_NAME | (cp[1] == '?' ? ERR_JOBPAT : ERR_NOSUCHJOB));
    /* NOTREACHED */
    return (0);
}


/*
 * pgetcurr - find most recent job that is not pp, preferably stopped
 */
static struct process *
1726
pgetcurr(struct process *pp)
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746
{
    struct process *np;
    struct process *xp = NULL;

    for (np = proclist.p_next; np; np = np->p_next)
	if (np != pcurrent && np != pp && np->p_procid &&
	    np->p_procid == np->p_jobid) {
	    if (np->p_flags & PSTOPPED)
		return (np);
	    if (xp == NULL)
		xp = np;
	}
    return (xp);
}

/*
 * donotify - flag the job so as to report termination asynchronously
 */
/*ARGSUSED*/
void
1747
donotify(Char **v, struct command *c)
1748 1749 1750 1751 1752 1753 1754 1755
{
    struct process *pp;

    USE(c);
    pp = pfind(*++v);
    pp->p_flags |= PNOTIFY;
}

1756 1757 1758 1759 1760 1761 1762 1763
#ifdef SIGSYNCH
static void
synch_handler(int sno)
{
    USE(sno);
}
#endif /* SIGSYNCH */

1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
/*
 * Do the fork and whatever should be done in the child side that
 * should not be done if we are not forking at all (like for simple builtin's)
 * Also do everything that needs any signals fiddled with in the parent side
 *
 * Wanttty tells whether process and/or tty pgrps are to be manipulated:
 *	-1:	leave tty alone; inherit pgrp from parent
 *	 0:	already have tty; manipulate process pgrps only
 *	 1:	want to claim tty; manipulate process and tty pgrps
 * It is usually just the value of tpgrp.
 */

1776 1777
pid_t
pfork(struct command *t, int wanttty)
1778
{
1779
    pid_t pid;
1780
    int    ignint = 0;
1781
    pid_t pgrp;
1782
#ifdef SIGSYNCH
1783
    struct sigaction osa, nsa;
1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
#endif /* SIGSYNCH */

    /*
     * A child will be uninterruptible only under very special conditions.
     * Remember that the semantics of '&' is implemented by disconnecting the
     * process from the tty so signals do not need to ignored just for '&'.
     * Thus signals are set to default action for children unless: we have had
     * an "onintr -" (then specifically ignored) we are not playing with
     * signals (inherit action)
     */
    if (setintr)
	ignint = (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT))
	    || (gointr && eq(gointr, STRminus));

    /*
     * Check for maximum nesting of 16 processes to avoid Forking loops
     */
    if (child == 16)
	stderror(ERR_NESTING, 16);
#ifdef SIGSYNCH
1804 1805 1806 1807 1808
    nsa.sa_handler = synch_handler;
    sigfillset(&nsa.sa_mask);
    nsa.sa_flags = SA_RESTART;
    if (sigaction(SIGSYNCH, &nsa, &osa))
	stderror(ERR_SYSTEM, "pfork: sigaction set", strerror(errno));
1809 1810
#endif /* SIGSYNCH */
    /*
1811
     * Hold pchild() until we have the process installed in our table.
1812 1813
     */
    if (wanttty < 0) {
1814 1815
	pchild_disabled++;
	cleanup_push(&pchild_disabled, disabled_cleanup);
1816 1817 1818 1819
    }
    while ((pid = fork()) == -1)
	if (setintr == 0)
	    (void) sleep(FORKSLEEP);
1820
	else
1821 1822
	    stderror(ERR_NOPROC);
    if (pid == 0) {
1823 1824
	(void)cleanup_push_mark(); /* Never to be popped */
	pchild_disabled = 0;
1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
	settimes();
	pgrp = pcurrjob ? pcurrjob->p_jobid : getpid();
	pflushall();
	pcurrjob = NULL;
#if !defined(BSDTIMES) && !defined(_SEQUENT_) 
	timesdone = 0;
#endif /* !defined(BSDTIMES) && !defined(_SEQUENT_) */
	child++;
	if (setintr) {
	    setintr = 0;	/* until I think otherwise */
	    /*
	     * Children just get blown away on SIGINT, SIGQUIT unless "onintr
	     * -" seen.
	     */
	    (void) signal(SIGINT, ignint ? SIG_IGN : SIG_DFL);
	    (void) signal(SIGQUIT, ignint ? SIG_IGN : SIG_DFL);
#ifdef BSDJOBS
	    if (wanttty >= 0) {
		/* make stoppable */
		(void) signal(SIGTSTP, SIG_DFL);
		(void) signal(SIGTTIN, SIG_DFL);
		(void) signal(SIGTTOU, SIG_DFL);
	    }
#endif /* BSDJOBS */
1849
	    sigaction(SIGTERM, &parterm, NULL);
1850 1851 1852 1853 1854 1855
	}
	else if (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT)) {
	    (void) signal(SIGINT, SIG_IGN);
	    (void) signal(SIGQUIT, SIG_IGN);
	}
#ifdef OREO
1856
	signal(SIGIO, SIG_IGN);	/* ignore SIGIO in child too */
1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868
#endif /* OREO */

	pgetty(wanttty, pgrp);
	/*
	 * Nohup and nice apply only to NODE_COMMAND's but it would be nice
	 * (?!?) if you could say "nohup (foo;bar)" Then the parser would have
	 * to know about nice/nohup/time
	 */
	if (t->t_dflg & F_NOHUP)
	    (void) signal(SIGHUP, SIG_IGN);
	if (t->t_dflg & F_NICE) {
	    int nval = SIGN_EXTEND_CHAR(t->t_nice);
1869
#if defined(HAVE_SETPRIORITY) && defined(PRIO_PROCESS)
1870
	    if (setpriority(PRIO_PROCESS, 0, nval) == -1 && errno)
1871
		stderror(ERR_SYSTEM, "setpriority", strerror(errno));
1872
#else /* !HAVE_SETPRIORITY || !PRIO_PROCESS */
1873
	    (void) nice(nval);
1874
#endif /* HAVE_SETPRIORITY  && PRIO_PROCESS */
1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912
	}
#ifdef F_VER
        if (t->t_dflg & F_VER) {
	    tsetenv(STRSYSTYPE, t->t_systype ? STRbsd43 : STRsys53);
	    dohash(NULL, NULL);
	}
#endif /* F_VER */
#ifdef SIGSYNCH
	/* rfw 8/89 now parent can continue */
	if (kill(getppid(), SIGSYNCH))
	    stderror(ERR_SYSTEM, "pfork child: kill", strerror(errno));
#endif /* SIGSYNCH */

    }
    else {
#ifdef POSIXJOBS
        if (wanttty >= 0) {
	    /*
	     * `Walking' process group fix from Beto Appleton.
	     * (beto@aixwiz.austin.ibm.com)
	     * If setpgid fails at this point that means that
	     * our process leader has died. We flush the current
	     * job and become the process leader ourselves.
	     * The parent will figure that out later.
	     */
	    pgrp = pcurrjob ? pcurrjob->p_jobid : pid;
	    if (setpgid(pid, pgrp) == -1 && errno == EPERM) {
		pcurrjob = NULL;
		/* 
		 * We don't care if this causes an error here;
		 * then we are already in the right process group
		 */
		(void) setpgid(pid, pgrp = pid);
	    }
	}
#endif /* POSIXJOBS */
	palloc(pid, t);
#ifdef SIGSYNCH
1913 1914 1915
	{
	    sigset_t pause_mask;

1916 1917 1918 1919 1920 1921 1922 1923
	/*
	 * rfw 8/89 Wait for child to own terminal.  Solves half of ugly
	 * synchronization problem.  With this change, we know that the only
	 * reason setpgrp to a previous process in a pipeline can fail is that
	 * the previous process has already exited. Without this hack, he may
	 * either have exited or not yet started to run.  Two uglies become
	 * one.
	 */
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	    sigprocmask(SIG_BLOCK, NULL, &pause);
	    sigdelset(&pause_mask, SIGCHLD);
	    sigdelset(&pause_mask, SIGSYNCH);
	    sigsuspend(&pause_mask);
1928
	    (void)handle_pending_signals();
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	    if (sigaction(SIGSYNCH, &osa, NULL))
		stderror(ERR_SYSTEM, "pfork parent: sigaction restore",
			 strerror(errno));
	}
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#endif /* SIGSYNCH */

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	if (wanttty < 0)
	    cleanup_until(&pchild_disabled);
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    }
    return (pid);
}

static void
1942
okpcntl(void)
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{
    if (tpgrp == -1)
	stderror(ERR_JOBCONTROL);
    if (tpgrp == 0)
	stderror(ERR_JOBCTRLSUB);
}


static void
1952
setttypgrp(int pgrp)
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{
    /*
     * If we are piping out a builtin, eg. 'echo | more' things can go
     * out of sequence, i.e. the more can run before the echo. This
     * can happen even if we have vfork, since the echo will be forked
     * with the regular fork. In this case, we need to set the tty
     * pgrp ourselves. If that happens, then the process will be still
     * alive. And the tty process group will already be set.
     * This should fix the famous sequent problem as a side effect:
     *    The controlling terminal is lost if all processes in the
     *    terminal process group are zombies. In this case tcgetpgrp()
     *    returns 0. If this happens we must set the terminal process
     *    group again.
     */
    if (tcgetpgrp(FSHTTY) != pgrp) {
#ifdef POSIXJOBS
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	struct sigaction old;

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        /*
	 * tcsetpgrp will set SIGTTOU to all the the processes in 
	 * the background according to POSIX... We ignore this here.
	 */
1975 1976
	sigaction(SIGTTOU, NULL, &old);
	signal(SIGTTOU, SIG_IGN);
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#endif
	(void) tcsetpgrp(FSHTTY, pgrp);
# ifdef POSIXJOBS
1980
	sigaction(SIGTTOU, &old, NULL);
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# endif

    }
}


/*
 * if we don't have vfork(), things can still go in the wrong order
 * resulting in the famous 'Stopped (tty output)'. But some systems
 * don't permit the setpgid() call, (these are more recent secure
 * systems such as ibm's aix), when they do. Then we'd rather print 
 * an error message than hang the shell!
 * I am open to suggestions how to fix that.
 */
void
1996
pgetty(int wanttty, pid_t pgrp)
1997 1998
{
#ifdef BSDJOBS
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# ifdef POSIXJOBS
    sigset_t oset, set;
# endif /* POSIXJOBS */

    jobdebug_xprintf(("wanttty %d pid %d opgrp%d pgrp %d tpgrp %d\n",
		      wanttty, (int)getpid(), (int)pgrp, (int)mygetpgrp(),
		      (int)tcgetpgrp(FSHTTY)));
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# ifdef POSIXJOBS
    /*
     * christos: I am blocking the tty signals till I've set things
     * correctly....
     */
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    if (wanttty > 0) {
	sigemptyset(&set);
	sigaddset(&set, SIGTSTP);
	sigaddset(&set, SIGTTIN);
	(void)sigprocmask(SIG_BLOCK, &set, &oset);
	cleanup_push(&oset, sigprocmask_cleanup);
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    }
# endif /* POSIXJOBS */

# ifndef POSIXJOBS
    if (wanttty > 0)
	setttypgrp(pgrp);
# endif /* !POSIXJOBS */

    /*
     * From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
     * Don't check for tpgrp >= 0 so even non-interactive shells give
     * background jobs process groups Same for the comparison in the other part
     * of the #ifdef
     */
    if (wanttty >= 0) {
	if (setpgid(0, pgrp) == -1) {
# ifdef POSIXJOBS
	    /* Walking process group fix; see above */
	    if (setpgid(0, pgrp = getpid()) == -1) {
# endif /* POSIXJOBS */
		stderror(ERR_SYSTEM, "setpgid child:\n", strerror(errno));
		xexit(0);
# ifdef POSIXJOBS
	    }
	    wanttty = pgrp;  /* Now we really want the tty, since we became the
			      * the process group leader
			      */
# endif /* POSIXJOBS */
	}
    }

# ifdef POSIXJOBS
2049
    if (wanttty > 0) {
2050
	setttypgrp(pgrp);
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	cleanup_until(&oset);
    }
2053 2054
# endif /* POSIXJOBS */

2055 2056
    jobdebug_xprintf(("wanttty %d pid %d pgrp %d tpgrp %d\n",
		      wanttty, getpid(), mygetpgrp(), tcgetpgrp(FSHTTY)));
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    if (tpgrp > 0)
	tpgrp = 0;		/* gave tty away */
#endif /* BSDJOBS */
}