1126 lines
24 KiB
C
1126 lines
24 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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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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* $Id: jobs.c,v 1.16 1997/08/18 02:53:19 steve Exp $
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*/
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#ifndef lint
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static char const sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95";
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#endif /* not lint */
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#include <fcntl.h>
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#include <signal.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/param.h>
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#ifdef BSD
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#include <sys/wait.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#endif
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#include <sys/ioctl.h>
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#include "shell.h"
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#if JOBS
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#if OLD_TTY_DRIVER
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#include "sgtty.h"
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#else
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#include <termios.h>
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#endif
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#undef CEOF /* syntax.h redefines this */
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#endif
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#include "redir.h"
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#include "show.h"
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#include "main.h"
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#include "parser.h"
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#include "nodes.h"
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#include "jobs.h"
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#include "options.h"
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#include "trap.h"
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#include "syntax.h"
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#include "input.h"
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#include "output.h"
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#include "memalloc.h"
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#include "error.h"
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#include "mystring.h"
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struct job *jobtab; /* array of jobs */
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int njobs; /* size of array */
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MKINIT pid_t backgndpid = -1; /* pid of last background process */
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#if JOBS
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int initialpgrp; /* pgrp of shell on invocation */
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int curjob; /* current job */
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#endif
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#if JOBS
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STATIC void restartjob __P((struct job *));
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#endif
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STATIC void freejob __P((struct job *));
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STATIC struct job *getjob __P((char *));
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STATIC int dowait __P((int, struct job *));
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#if SYSV
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STATIC int onsigchild __P((void));
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#endif
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STATIC int waitproc __P((int, int *));
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STATIC void cmdtxt __P((union node *));
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STATIC void cmdputs __P((char *));
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/*
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* Turn job control on and off.
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*
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* Note: This code assumes that the third arg to ioctl is a character
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* pointer, which is true on Berkeley systems but not System V. Since
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* System V doesn't have job control yet, this isn't a problem now.
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*/
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MKINIT int jobctl;
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#if JOBS
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void
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setjobctl(on)
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int on;
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{
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#ifdef OLD_TTY_DRIVER
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int ldisc;
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#endif
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if (on == jobctl || rootshell == 0)
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return;
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if (on) {
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do { /* while we are in the background */
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#ifdef OLD_TTY_DRIVER
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if (ioctl(2, TIOCGPGRP, (char *)&initialpgrp) < 0) {
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#else
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initialpgrp = tcgetpgrp(2);
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if (initialpgrp < 0) {
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#endif
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out2str("sh: can't access tty; job control turned off\n");
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mflag = 0;
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return;
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}
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if (initialpgrp == -1)
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initialpgrp = getpgrp();
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else if (initialpgrp != getpgrp()) {
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killpg(initialpgrp, SIGTTIN);
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continue;
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}
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} while (0);
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#ifdef OLD_TTY_DRIVER
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if (ioctl(2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) {
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out2str("sh: need new tty driver to run job control; job control turned off\n");
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mflag = 0;
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return;
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}
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#endif
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setsignal(SIGTSTP);
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setsignal(SIGTTOU);
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setsignal(SIGTTIN);
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setpgid(0, rootpid);
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#ifdef OLD_TTY_DRIVER
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ioctl(2, TIOCSPGRP, (char *)&rootpid);
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#else
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tcsetpgrp(2, rootpid);
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#endif
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} else { /* turning job control off */
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setpgid(0, initialpgrp);
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#ifdef OLD_TTY_DRIVER
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ioctl(2, TIOCSPGRP, (char *)&initialpgrp);
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#else
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tcsetpgrp(2, initialpgrp);
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#endif
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setsignal(SIGTSTP);
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setsignal(SIGTTOU);
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setsignal(SIGTTIN);
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}
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jobctl = on;
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}
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#endif
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#ifdef mkinit
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INCLUDE <sys/types.h>
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INCLUDE <stdlib.h>
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SHELLPROC {
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backgndpid = -1;
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#if JOBS
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jobctl = 0;
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#endif
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}
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#endif
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#if JOBS
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int
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fgcmd(argc, argv)
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int argc __unused;
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char **argv;
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{
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struct job *jp;
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int pgrp;
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int status;
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jp = getjob(argv[1]);
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if (jp->jobctl == 0)
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error("job not created under job control");
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pgrp = jp->ps[0].pid;
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#ifdef OLD_TTY_DRIVER
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ioctl(2, TIOCSPGRP, (char *)&pgrp);
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#else
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tcsetpgrp(2, pgrp);
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#endif
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restartjob(jp);
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INTOFF;
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status = waitforjob(jp);
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INTON;
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return status;
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}
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int
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bgcmd(argc, argv)
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int argc;
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char **argv;
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{
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struct job *jp;
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do {
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jp = getjob(*++argv);
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if (jp->jobctl == 0)
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error("job not created under job control");
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restartjob(jp);
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} while (--argc > 1);
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return 0;
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}
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STATIC void
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restartjob(jp)
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struct job *jp;
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{
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struct procstat *ps;
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int i;
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if (jp->state == JOBDONE)
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return;
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INTOFF;
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killpg(jp->ps[0].pid, SIGCONT);
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for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
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if (WIFSTOPPED(ps->status)) {
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ps->status = -1;
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jp->state = 0;
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}
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}
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INTON;
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}
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#endif
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int
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jobscmd(argc, argv)
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int argc __unused;
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char **argv __unused;
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{
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showjobs(0);
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return 0;
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}
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/*
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* Print a list of jobs. If "change" is nonzero, only print jobs whose
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* statuses have changed since the last call to showjobs.
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*
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* If the shell is interrupted in the process of creating a job, the
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* result may be a job structure containing zero processes. Such structures
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* will be freed here.
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*/
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void
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showjobs(change)
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int change;
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{
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int jobno;
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int procno;
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int i;
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struct job *jp;
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struct procstat *ps;
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int col;
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char s[64];
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TRACE(("showjobs(%d) called\n", change));
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while (dowait(0, (struct job *)NULL) > 0);
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for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
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if (! jp->used)
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continue;
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if (jp->nprocs == 0) {
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freejob(jp);
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continue;
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}
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if (change && ! jp->changed)
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continue;
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procno = jp->nprocs;
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for (ps = jp->ps ; ; ps++) { /* for each process */
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if (ps == jp->ps)
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fmtstr(s, 64, "[%d] %d ", jobno, ps->pid);
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else
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fmtstr(s, 64, " %d ", ps->pid);
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out1str(s);
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col = strlen(s);
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s[0] = '\0';
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if (ps->status == -1) {
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/* don't print anything */
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} else if (WIFEXITED(ps->status)) {
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fmtstr(s, 64, "Exit %d", WEXITSTATUS(ps->status));
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} else {
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#if JOBS
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if (WIFSTOPPED(ps->status))
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i = WSTOPSIG(ps->status);
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else
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#endif
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i = WTERMSIG(ps->status);
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if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F])
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scopy(sys_siglist[i & 0x7F], s);
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else
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fmtstr(s, 64, "Signal %d", i & 0x7F);
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if (WCOREDUMP(ps->status))
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strcat(s, " (core dumped)");
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}
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out1str(s);
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col += strlen(s);
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do {
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out1c(' ');
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col++;
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} while (col < 30);
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out1str(ps->cmd);
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out1c('\n');
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if (--procno <= 0)
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break;
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}
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jp->changed = 0;
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if (jp->state == JOBDONE) {
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freejob(jp);
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}
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}
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}
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/*
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* Mark a job structure as unused.
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*/
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STATIC void
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freejob(jp)
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struct job *jp;
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{
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struct procstat *ps;
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int i;
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INTOFF;
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for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
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if (ps->cmd != nullstr)
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ckfree(ps->cmd);
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}
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if (jp->ps != &jp->ps0)
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ckfree(jp->ps);
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jp->used = 0;
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#if JOBS
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if (curjob == jp - jobtab + 1)
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curjob = 0;
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#endif
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INTON;
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}
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int
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waitcmd(argc, argv)
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int argc;
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char **argv;
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{
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struct job *job;
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int status, retval;
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struct job *jp;
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if (argc > 1) {
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job = getjob(argv[1]);
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} else {
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job = NULL;
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}
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for (;;) { /* loop until process terminated or stopped */
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if (job != NULL) {
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if (job->state) {
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status = job->ps[job->nprocs - 1].status;
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if (WIFEXITED(status))
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retval = WEXITSTATUS(status);
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#if JOBS
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else if (WIFSTOPPED(status))
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retval = WSTOPSIG(status) + 128;
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#endif
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else
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retval = WTERMSIG(status) + 128;
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if (! iflag)
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freejob(job);
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return retval;
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}
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} else {
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for (jp = jobtab ; ; jp++) {
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if (jp >= jobtab + njobs) { /* no running procs */
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return 0;
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}
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if (jp->used && jp->state == 0)
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break;
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}
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}
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dowait(1, (struct job *)NULL);
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}
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}
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int
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jobidcmd(argc, argv)
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int argc __unused;
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char **argv;
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{
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struct job *jp;
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int i;
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jp = getjob(argv[1]);
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for (i = 0 ; i < jp->nprocs ; ) {
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out1fmt("%d", jp->ps[i].pid);
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out1c(++i < jp->nprocs? ' ' : '\n');
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}
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return 0;
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}
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/*
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* Convert a job name to a job structure.
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*/
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STATIC struct job *
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getjob(name)
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char *name;
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{
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int jobno;
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struct job *jp;
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int pid;
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int i;
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if (name == NULL) {
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#if JOBS
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currentjob:
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if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0)
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error("No current job");
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return &jobtab[jobno - 1];
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#else
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error("No current job");
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#endif
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} else if (name[0] == '%') {
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if (is_digit(name[1])) {
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jobno = number(name + 1);
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if (jobno > 0 && jobno <= njobs
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&& jobtab[jobno - 1].used != 0)
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return &jobtab[jobno - 1];
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#if JOBS
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} else if (name[1] == '%' && name[2] == '\0') {
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goto currentjob;
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#endif
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} else {
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struct job *found = NULL;
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for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
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if (jp->used && jp->nprocs > 0
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&& prefix(name + 1, jp->ps[0].cmd)) {
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if (found)
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error("%s: ambiguous", name);
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found = jp;
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}
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}
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if (found)
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return found;
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}
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} else if (is_number(name)) {
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pid = number(name);
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for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
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if (jp->used && jp->nprocs > 0
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&& jp->ps[jp->nprocs - 1].pid == pid)
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return jp;
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}
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}
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error("No such job: %s", name);
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/*NOTREACHED*/
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return NULL;
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}
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|
|
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|
/*
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* Return a new job structure,
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*/
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struct job *
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makejob(node, nprocs)
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union node *node __unused;
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|
int nprocs;
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|
{
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|
int i;
|
|
struct job *jp;
|
|
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|
for (i = njobs, jp = jobtab ; ; jp++) {
|
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if (--i < 0) {
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INTOFF;
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|
if (njobs == 0) {
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jobtab = ckmalloc(4 * sizeof jobtab[0]);
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|
} else {
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jp = ckmalloc((njobs + 4) * sizeof jobtab[0]);
|
|
memcpy(jp, jobtab, njobs * sizeof jp[0]);
|
|
/* Relocate `ps' pointers */
|
|
for (i = 0; i < njobs; i++)
|
|
if (jp[i].ps == &jobtab[i].ps0)
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|
jp[i].ps = &jp[i].ps0;
|
|
ckfree(jobtab);
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|
jobtab = jp;
|
|
}
|
|
jp = jobtab + njobs;
|
|
for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
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|
INTON;
|
|
break;
|
|
}
|
|
if (jp->used == 0)
|
|
break;
|
|
}
|
|
INTOFF;
|
|
jp->state = 0;
|
|
jp->used = 1;
|
|
jp->changed = 0;
|
|
jp->nprocs = 0;
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|
#if JOBS
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|
jp->jobctl = jobctl;
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|
#endif
|
|
if (nprocs > 1) {
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|
jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
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|
} else {
|
|
jp->ps = &jp->ps0;
|
|
}
|
|
INTON;
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|
TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs,
|
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jp - jobtab + 1));
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|
return jp;
|
|
}
|
|
|
|
|
|
/*
|
|
* Fork of a subshell. If we are doing job control, give the subshell its
|
|
* own process group. Jp is a job structure that the job is to be added to.
|
|
* N is the command that will be evaluated by the child. Both jp and n may
|
|
* be NULL. The mode parameter can be one of the following:
|
|
* FORK_FG - Fork off a foreground process.
|
|
* FORK_BG - Fork off a background process.
|
|
* FORK_NOJOB - Like FORK_FG, but don't give the process its own
|
|
* process group even if job control is on.
|
|
*
|
|
* When job control is turned off, background processes have their standard
|
|
* input redirected to /dev/null (except for the second and later processes
|
|
* in a pipeline).
|
|
*/
|
|
|
|
int
|
|
forkshell(jp, n, mode)
|
|
union node *n;
|
|
struct job *jp;
|
|
int mode;
|
|
{
|
|
int pid;
|
|
int pgrp;
|
|
|
|
TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n,
|
|
mode));
|
|
INTOFF;
|
|
pid = fork();
|
|
if (pid == -1) {
|
|
TRACE(("Fork failed, errno=%d\n", errno));
|
|
INTON;
|
|
error("Cannot fork");
|
|
}
|
|
if (pid == 0) {
|
|
struct job *p;
|
|
int wasroot;
|
|
int i;
|
|
|
|
TRACE(("Child shell %d\n", getpid()));
|
|
wasroot = rootshell;
|
|
rootshell = 0;
|
|
for (i = njobs, p = jobtab ; --i >= 0 ; p++)
|
|
if (p->used)
|
|
freejob(p);
|
|
closescript();
|
|
INTON;
|
|
clear_traps();
|
|
#if JOBS
|
|
jobctl = 0; /* do job control only in root shell */
|
|
if (wasroot && mode != FORK_NOJOB && mflag) {
|
|
if (jp == NULL || jp->nprocs == 0)
|
|
pgrp = getpid();
|
|
else
|
|
pgrp = jp->ps[0].pid;
|
|
if (setpgid(0, pgrp) == 0 && mode == FORK_FG) {
|
|
/*** this causes superfluous TIOCSPGRPS ***/
|
|
#ifdef OLD_TTY_DRIVER
|
|
if (ioctl(2, TIOCSPGRP, (char *)&pgrp) < 0)
|
|
error("TIOCSPGRP failed, errno=%d", errno);
|
|
#else
|
|
if (tcsetpgrp(2, pgrp) < 0)
|
|
error("tcsetpgrp failed, errno=%d", errno);
|
|
#endif
|
|
}
|
|
setsignal(SIGTSTP);
|
|
setsignal(SIGTTOU);
|
|
} else if (mode == FORK_BG) {
|
|
ignoresig(SIGINT);
|
|
ignoresig(SIGQUIT);
|
|
if ((jp == NULL || jp->nprocs == 0) &&
|
|
! fd0_redirected_p ()) {
|
|
close(0);
|
|
if (open("/dev/null", O_RDONLY) != 0)
|
|
error("Can't open /dev/null");
|
|
}
|
|
}
|
|
#else
|
|
if (mode == FORK_BG) {
|
|
ignoresig(SIGINT);
|
|
ignoresig(SIGQUIT);
|
|
if ((jp == NULL || jp->nprocs == 0) &&
|
|
! fd0_redirected_p ()) {
|
|
close(0);
|
|
if (open("/dev/null", O_RDONLY) != 0)
|
|
error("Can't open /dev/null");
|
|
}
|
|
}
|
|
#endif
|
|
if (wasroot && iflag) {
|
|
setsignal(SIGINT);
|
|
setsignal(SIGQUIT);
|
|
setsignal(SIGTERM);
|
|
}
|
|
return pid;
|
|
}
|
|
if (rootshell && mode != FORK_NOJOB && mflag) {
|
|
if (jp == NULL || jp->nprocs == 0)
|
|
pgrp = pid;
|
|
else
|
|
pgrp = jp->ps[0].pid;
|
|
setpgid(pid, pgrp);
|
|
}
|
|
if (mode == FORK_BG)
|
|
backgndpid = pid; /* set $! */
|
|
if (jp) {
|
|
struct procstat *ps = &jp->ps[jp->nprocs++];
|
|
ps->pid = pid;
|
|
ps->status = -1;
|
|
ps->cmd = nullstr;
|
|
if (iflag && rootshell && n)
|
|
ps->cmd = commandtext(n);
|
|
}
|
|
INTON;
|
|
TRACE(("In parent shell: child = %d\n", pid));
|
|
return pid;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Wait for job to finish.
|
|
*
|
|
* Under job control we have the problem that while a child process is
|
|
* running interrupts generated by the user are sent to the child but not
|
|
* to the shell. This means that an infinite loop started by an inter-
|
|
* active user may be hard to kill. With job control turned off, an
|
|
* interactive user may place an interactive program inside a loop. If
|
|
* the interactive program catches interrupts, the user doesn't want
|
|
* these interrupts to also abort the loop. The approach we take here
|
|
* is to have the shell ignore interrupt signals while waiting for a
|
|
* forground process to terminate, and then send itself an interrupt
|
|
* signal if the child process was terminated by an interrupt signal.
|
|
* Unfortunately, some programs want to do a bit of cleanup and then
|
|
* exit on interrupt; unless these processes terminate themselves by
|
|
* sending a signal to themselves (instead of calling exit) they will
|
|
* confuse this approach.
|
|
*/
|
|
|
|
int
|
|
waitforjob(jp)
|
|
struct job *jp;
|
|
{
|
|
#if JOBS
|
|
int mypgrp = getpgrp();
|
|
#endif
|
|
int status;
|
|
int st;
|
|
|
|
INTOFF;
|
|
TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1));
|
|
while (jp->state == 0) {
|
|
dowait(1, jp);
|
|
}
|
|
#if JOBS
|
|
if (jp->jobctl) {
|
|
#ifdef OLD_TTY_DRIVER
|
|
if (ioctl(2, TIOCSPGRP, (char *)&mypgrp) < 0)
|
|
error("TIOCSPGRP failed, errno=%d\n", errno);
|
|
#else
|
|
if (tcsetpgrp(2, mypgrp) < 0)
|
|
error("tcsetpgrp failed, errno=%d\n", errno);
|
|
#endif
|
|
}
|
|
if (jp->state == JOBSTOPPED)
|
|
curjob = jp - jobtab + 1;
|
|
#endif
|
|
status = jp->ps[jp->nprocs - 1].status;
|
|
/* convert to 8 bits */
|
|
if (WIFEXITED(status))
|
|
st = WEXITSTATUS(status);
|
|
#if JOBS
|
|
else if (WIFSTOPPED(status))
|
|
st = WSTOPSIG(status) + 128;
|
|
#endif
|
|
else
|
|
st = WTERMSIG(status) + 128;
|
|
if (! JOBS || jp->state == JOBDONE)
|
|
freejob(jp);
|
|
CLEAR_PENDING_INT;
|
|
if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
|
|
kill(getpid(), SIGINT);
|
|
INTON;
|
|
return st;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Wait for a process to terminate.
|
|
*/
|
|
|
|
STATIC int
|
|
dowait(block, job)
|
|
int block;
|
|
struct job *job;
|
|
{
|
|
int pid;
|
|
int status;
|
|
struct procstat *sp;
|
|
struct job *jp;
|
|
struct job *thisjob;
|
|
int done;
|
|
int stopped;
|
|
int core;
|
|
int sig;
|
|
|
|
TRACE(("dowait(%d) called\n", block));
|
|
do {
|
|
pid = waitproc(block, &status);
|
|
TRACE(("wait returns %d, status=%d\n", pid, status));
|
|
} while (pid == -1 && errno == EINTR);
|
|
if (pid <= 0)
|
|
return pid;
|
|
INTOFF;
|
|
thisjob = NULL;
|
|
for (jp = jobtab ; jp < jobtab + njobs ; jp++) {
|
|
if (jp->used) {
|
|
done = 1;
|
|
stopped = 1;
|
|
for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) {
|
|
if (sp->pid == -1)
|
|
continue;
|
|
if (sp->pid == pid) {
|
|
TRACE(("Changing status of proc %d from 0x%x to 0x%x\n",
|
|
pid, sp->status, status));
|
|
sp->status = status;
|
|
thisjob = jp;
|
|
}
|
|
if (sp->status == -1)
|
|
stopped = 0;
|
|
else if (WIFSTOPPED(sp->status))
|
|
done = 0;
|
|
}
|
|
if (stopped) { /* stopped or done */
|
|
int state = done? JOBDONE : JOBSTOPPED;
|
|
if (jp->state != state) {
|
|
TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state));
|
|
jp->state = state;
|
|
#if JOBS
|
|
if (done && curjob == jp - jobtab + 1)
|
|
curjob = 0; /* no current job */
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
}
|
|
INTON;
|
|
if (! rootshell || ! iflag || (job && thisjob == job)) {
|
|
core = WCOREDUMP(status);
|
|
#if JOBS
|
|
if (WIFSTOPPED(status))
|
|
sig = WSTOPSIG(status);
|
|
else
|
|
#endif
|
|
if (WIFEXITED(status))
|
|
sig = 0;
|
|
else
|
|
sig = WTERMSIG(status);
|
|
|
|
if (sig != 0 && sig != SIGINT && sig != SIGPIPE) {
|
|
if (thisjob != job)
|
|
outfmt(out2, "%d: ", pid);
|
|
#if JOBS
|
|
if (sig == SIGTSTP && rootshell && iflag)
|
|
outfmt(out2, "%%%d ", job - jobtab + 1);
|
|
#endif
|
|
if (sig < NSIG && sys_siglist[sig])
|
|
out2str(sys_siglist[sig]);
|
|
else
|
|
outfmt(out2, "Signal %d", sig);
|
|
if (core)
|
|
out2str(" - core dumped");
|
|
out2c('\n');
|
|
flushout(&errout);
|
|
} else {
|
|
TRACE(("Not printing status: status=%d, sig=%d\n",
|
|
status, sig));
|
|
}
|
|
} else {
|
|
TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job));
|
|
if (thisjob)
|
|
thisjob->changed = 1;
|
|
}
|
|
return pid;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Do a wait system call. If job control is compiled in, we accept
|
|
* stopped processes. If block is zero, we return a value of zero
|
|
* rather than blocking.
|
|
*
|
|
* System V doesn't have a non-blocking wait system call. It does
|
|
* have a SIGCLD signal that is sent to a process when one of it's
|
|
* children dies. The obvious way to use SIGCLD would be to install
|
|
* a handler for SIGCLD which simply bumped a counter when a SIGCLD
|
|
* was received, and have waitproc bump another counter when it got
|
|
* the status of a process. Waitproc would then know that a wait
|
|
* system call would not block if the two counters were different.
|
|
* This approach doesn't work because if a process has children that
|
|
* have not been waited for, System V will send it a SIGCLD when it
|
|
* installs a signal handler for SIGCLD. What this means is that when
|
|
* a child exits, the shell will be sent SIGCLD signals continuously
|
|
* until is runs out of stack space, unless it does a wait call before
|
|
* restoring the signal handler. The code below takes advantage of
|
|
* this (mis)feature by installing a signal handler for SIGCLD and
|
|
* then checking to see whether it was called. If there are any
|
|
* children to be waited for, it will be.
|
|
*
|
|
* If neither SYSV nor BSD is defined, we don't implement nonblocking
|
|
* waits at all. In this case, the user will not be informed when
|
|
* a background process until the next time she runs a real program
|
|
* (as opposed to running a builtin command or just typing return),
|
|
* and the jobs command may give out of date information.
|
|
*/
|
|
|
|
#ifdef SYSV
|
|
STATIC int gotsigchild;
|
|
|
|
STATIC int onsigchild() {
|
|
gotsigchild = 1;
|
|
}
|
|
#endif
|
|
|
|
|
|
STATIC int
|
|
waitproc(block, status)
|
|
int block;
|
|
int *status;
|
|
{
|
|
#ifdef BSD
|
|
int flags;
|
|
|
|
#if JOBS
|
|
flags = WUNTRACED;
|
|
#else
|
|
flags = 0;
|
|
#endif
|
|
if (block == 0)
|
|
flags |= WNOHANG;
|
|
return wait3(status, flags, (struct rusage *)NULL);
|
|
#else
|
|
#ifdef SYSV
|
|
int (*save)();
|
|
|
|
if (block == 0) {
|
|
gotsigchild = 0;
|
|
save = signal(SIGCLD, onsigchild);
|
|
signal(SIGCLD, save);
|
|
if (gotsigchild == 0)
|
|
return 0;
|
|
}
|
|
return wait(status);
|
|
#else
|
|
if (block == 0)
|
|
return 0;
|
|
return wait(status);
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* return 1 if there are stopped jobs, otherwise 0
|
|
*/
|
|
int job_warning = 0;
|
|
int
|
|
stoppedjobs()
|
|
{
|
|
int jobno;
|
|
struct job *jp;
|
|
|
|
if (job_warning)
|
|
return (0);
|
|
for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
|
|
if (jp->used == 0)
|
|
continue;
|
|
if (jp->state == JOBSTOPPED) {
|
|
out2str("You have stopped jobs.\n");
|
|
job_warning = 2;
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return a string identifying a command (to be printed by the
|
|
* jobs command.
|
|
*/
|
|
|
|
STATIC char *cmdnextc;
|
|
STATIC int cmdnleft;
|
|
STATIC void cmdtxt(), cmdputs();
|
|
#define MAXCMDTEXT 200
|
|
|
|
char *
|
|
commandtext(n)
|
|
union node *n;
|
|
{
|
|
char *name;
|
|
|
|
cmdnextc = name = ckmalloc(MAXCMDTEXT);
|
|
cmdnleft = MAXCMDTEXT - 4;
|
|
cmdtxt(n);
|
|
*cmdnextc = '\0';
|
|
return name;
|
|
}
|
|
|
|
|
|
STATIC void
|
|
cmdtxt(n)
|
|
union node *n;
|
|
{
|
|
union node *np;
|
|
struct nodelist *lp;
|
|
char *p;
|
|
int i;
|
|
char s[2];
|
|
|
|
if (n == NULL)
|
|
return;
|
|
switch (n->type) {
|
|
case NSEMI:
|
|
cmdtxt(n->nbinary.ch1);
|
|
cmdputs("; ");
|
|
cmdtxt(n->nbinary.ch2);
|
|
break;
|
|
case NAND:
|
|
cmdtxt(n->nbinary.ch1);
|
|
cmdputs(" && ");
|
|
cmdtxt(n->nbinary.ch2);
|
|
break;
|
|
case NOR:
|
|
cmdtxt(n->nbinary.ch1);
|
|
cmdputs(" || ");
|
|
cmdtxt(n->nbinary.ch2);
|
|
break;
|
|
case NPIPE:
|
|
for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
|
|
cmdtxt(lp->n);
|
|
if (lp->next)
|
|
cmdputs(" | ");
|
|
}
|
|
break;
|
|
case NSUBSHELL:
|
|
cmdputs("(");
|
|
cmdtxt(n->nredir.n);
|
|
cmdputs(")");
|
|
break;
|
|
case NREDIR:
|
|
case NBACKGND:
|
|
cmdtxt(n->nredir.n);
|
|
break;
|
|
case NIF:
|
|
cmdputs("if ");
|
|
cmdtxt(n->nif.test);
|
|
cmdputs("; then ");
|
|
cmdtxt(n->nif.ifpart);
|
|
cmdputs("...");
|
|
break;
|
|
case NWHILE:
|
|
cmdputs("while ");
|
|
goto until;
|
|
case NUNTIL:
|
|
cmdputs("until ");
|
|
until:
|
|
cmdtxt(n->nbinary.ch1);
|
|
cmdputs("; do ");
|
|
cmdtxt(n->nbinary.ch2);
|
|
cmdputs("; done");
|
|
break;
|
|
case NFOR:
|
|
cmdputs("for ");
|
|
cmdputs(n->nfor.var);
|
|
cmdputs(" in ...");
|
|
break;
|
|
case NCASE:
|
|
cmdputs("case ");
|
|
cmdputs(n->ncase.expr->narg.text);
|
|
cmdputs(" in ...");
|
|
break;
|
|
case NDEFUN:
|
|
cmdputs(n->narg.text);
|
|
cmdputs("() ...");
|
|
break;
|
|
case NCMD:
|
|
for (np = n->ncmd.args ; np ; np = np->narg.next) {
|
|
cmdtxt(np);
|
|
if (np->narg.next)
|
|
cmdputs(" ");
|
|
}
|
|
for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
|
|
cmdputs(" ");
|
|
cmdtxt(np);
|
|
}
|
|
break;
|
|
case NARG:
|
|
cmdputs(n->narg.text);
|
|
break;
|
|
case NTO:
|
|
p = ">"; i = 1; goto redir;
|
|
case NAPPEND:
|
|
p = ">>"; i = 1; goto redir;
|
|
case NTOFD:
|
|
p = ">&"; i = 1; goto redir;
|
|
case NFROM:
|
|
p = "<"; i = 0; goto redir;
|
|
case NFROMFD:
|
|
p = "<&"; i = 0; goto redir;
|
|
redir:
|
|
if (n->nfile.fd != i) {
|
|
s[0] = n->nfile.fd + '0';
|
|
s[1] = '\0';
|
|
cmdputs(s);
|
|
}
|
|
cmdputs(p);
|
|
if (n->type == NTOFD || n->type == NFROMFD) {
|
|
s[0] = n->ndup.dupfd + '0';
|
|
s[1] = '\0';
|
|
cmdputs(s);
|
|
} else {
|
|
cmdtxt(n->nfile.fname);
|
|
}
|
|
break;
|
|
case NHERE:
|
|
case NXHERE:
|
|
cmdputs("<<...");
|
|
break;
|
|
default:
|
|
cmdputs("???");
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
STATIC void
|
|
cmdputs(s)
|
|
char *s;
|
|
{
|
|
char *p, *q;
|
|
char c;
|
|
int subtype = 0;
|
|
|
|
if (cmdnleft <= 0)
|
|
return;
|
|
p = s;
|
|
q = cmdnextc;
|
|
while ((c = *p++) != '\0') {
|
|
if (c == CTLESC)
|
|
*q++ = *p++;
|
|
else if (c == CTLVAR) {
|
|
*q++ = '$';
|
|
if (--cmdnleft > 0)
|
|
*q++ = '{';
|
|
subtype = *p++;
|
|
} else if (c == '=' && subtype != 0) {
|
|
*q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL];
|
|
subtype = 0;
|
|
} else if (c == CTLENDVAR) {
|
|
*q++ = '}';
|
|
} else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE)
|
|
cmdnleft++; /* ignore it */
|
|
else
|
|
*q++ = c;
|
|
if (--cmdnleft <= 0) {
|
|
*q++ = '.';
|
|
*q++ = '.';
|
|
*q++ = '.';
|
|
break;
|
|
}
|
|
}
|
|
cmdnextc = q;
|
|
}
|