1481 lines
31 KiB
C
1481 lines
31 KiB
C
/* $NetBSD: jobs.c,v 1.57 2003/01/27 12:54:08 christos Exp $ */
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/*-
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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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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95";
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#else
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__RCSID("$NetBSD: jobs.c,v 1.57 2003/01/27 12:54:08 christos Exp $");
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#endif
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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 <paths.h>
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#include <sys/types.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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static struct job *jobtab; /* array of jobs */
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static int njobs; /* size of array */
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static int jobs_invalid; /* set in child */
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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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static int curjob = -1; /* current job */
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#endif
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static int ttyfd = -1;
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STATIC void restartjob(struct job *);
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STATIC void freejob(struct job *);
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STATIC struct job *getjob(const char *, int);
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STATIC int dowait(int, struct job *);
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STATIC int onsigchild(void);
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STATIC int waitproc(int, struct job *, int *);
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STATIC void cmdtxt(union node *);
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STATIC void cmdlist(union node *, int);
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STATIC void cmdputs(const char *);
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#ifdef OLD_TTY_DRIVER
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static pid_t tcgetpgrp(int fd);
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static int tcsetpgrp(int fd, pid_t pgrp);
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static pid_t
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tcgetpgrp(int fd)
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{
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pid_t pgrp;
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if (ioctl(fd, TIOCGPGRP, (char *)&pgrp) == -1)
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return -1;
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else
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return pgrp;
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}
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static int
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tcsetpgrp(int fd, pid_tpgrp)
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{
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return ioctl(fd, TIOCSPGRP, (char *)&pgrp);
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}
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#endif
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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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void
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setjobctl(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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#if defined(FIOCLEX) || defined(FD_CLOEXEC)
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int err;
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int i;
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if (ttyfd != -1)
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close(ttyfd);
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if ((ttyfd = open("/dev/tty", O_RDWR)) == -1) {
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for (i = 0; i < 3; i++) {
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if (isatty(i) && (ttyfd = dup(i)) != -1)
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break;
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}
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if (i == 3)
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goto out;
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}
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/* Move to a high fd */
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for (i = 10; i > 2; i--) {
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if ((err = fcntl(ttyfd, F_DUPFD, (1 << i) - 1)) != -1)
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break;
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}
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if (err != -1) {
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close(ttyfd);
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ttyfd = err;
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}
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#ifdef FIOCLEX
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err = ioctl(ttyfd, FIOCLEX, 0);
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#elif FD_CLOEXEC
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err = fcntl(ttyfd, FD_SETFD,
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fcntl(ttyfd, F_GETFD, 0) | FD_CLOEXEC);
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#endif
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if (err == -1) {
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close(ttyfd);
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ttyfd = -1;
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goto out;
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}
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#else
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out2str("sh: Need FIOCLEX or FD_CLOEXEC to support job control");
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goto out;
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#endif
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do { /* while we are in the background */
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if ((initialpgrp = tcgetpgrp(ttyfd)) < 0) {
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out:
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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(0, 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(ttyfd, TIOCGETD, (char *)&ldisc) < 0
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|| 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, 0);
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setsignal(SIGTTOU, 0);
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setsignal(SIGTTIN, 0);
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if (getpgid(0) != rootpid && setpgid(0, rootpid) == -1)
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error("Cannot set process group (%s) at %d",
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strerror(errno), __LINE__);
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if (tcsetpgrp(ttyfd, rootpid) == -1)
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error("Cannot set tty process group (%s) at %d",
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strerror(errno), __LINE__);
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} else { /* turning job control off */
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if (getpgid(0) != initialpgrp && setpgid(0, initialpgrp) == -1)
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error("Cannot set process group (%s) at %d",
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strerror(errno), __LINE__);
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if (tcsetpgrp(ttyfd, initialpgrp) == -1)
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error("Cannot set tty process group (%s) at %d",
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strerror(errno), __LINE__);
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close(ttyfd);
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ttyfd = -1;
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setsignal(SIGTSTP, 0);
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setsignal(SIGTTOU, 0);
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setsignal(SIGTTIN, 0);
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}
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jobctl = on;
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}
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#ifdef mkinit
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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(int argc, char **argv)
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{
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struct job *jp;
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int i;
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int status;
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nextopt("");
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jp = getjob(*argptr, 0);
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if (jp->jobctl == 0)
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error("job not created under job control");
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out1fmt("%s", jp->ps[0].cmd);
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for (i = 1; i < jp->nprocs; i++)
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out1fmt(" | %s", jp->ps[i].cmd );
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out1c('\n');
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flushall();
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for (i = 0; i < jp->nprocs; i++)
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if (tcsetpgrp(ttyfd, jp->ps[i].pid) != -1)
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break;
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if (i >= jp->nprocs) {
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error("Cannot set tty process group (%s) at %d",
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strerror(errno), __LINE__);
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}
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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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static void
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set_curjob(struct job *jp, int mode)
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{
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struct job *jp1, *jp2;
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int i, ji;
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ji = jp - jobtab;
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/* first remove from list */
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if (ji == curjob)
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curjob = jp->prev_job;
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else {
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for (i = 0; i < njobs; i++) {
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if (jobtab[i].prev_job != ji)
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continue;
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jobtab[i].prev_job = jp->prev_job;
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break;
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}
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}
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/* Then re-insert in correct position */
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switch (mode) {
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case 0: /* job being deleted */
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jp->prev_job = -1;
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break;
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case 1: /* newly created job or backgrounded job,
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put after all stopped jobs. */
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if (curjob != -1 && jobtab[curjob].state == JOBSTOPPED) {
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for (jp1 = jobtab + curjob; ; jp1 = jp2) {
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if (jp1->prev_job == -1)
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break;
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jp2 = jobtab + jp1->prev_job;
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if (jp2->state != JOBSTOPPED)
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break;
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}
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jp->prev_job = jp1->prev_job;
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jp1->prev_job = ji;
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break;
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}
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/* FALLTHROUGH */
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case 2: /* newly stopped job - becomes curjob */
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jp->prev_job = curjob;
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curjob = ji;
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break;
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}
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}
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int
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bgcmd(int argc, char **argv)
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{
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struct job *jp;
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int i;
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nextopt("");
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do {
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jp = getjob(*argptr, 0);
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if (jp->jobctl == 0)
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error("job not created under job control");
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set_curjob(jp, 1);
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out1fmt("[%ld] %s", (long)(jp - jobtab + 1), jp->ps[0].cmd);
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for (i = 1; i < jp->nprocs; i++)
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out1fmt(" | %s", jp->ps[i].cmd );
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out1c('\n');
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flushall();
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restartjob(jp);
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} while (*argptr && *++argptr);
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return 0;
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}
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STATIC void
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restartjob(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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for (i = 0; i < jp->nprocs; i++)
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if (killpg(jp->ps[i].pid, SIGCONT) != -1)
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break;
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if (i >= jp->nprocs)
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error("Cannot continue job (%s)", strerror(errno));
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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 = JOBRUNNING;
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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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static void
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showjob(struct output *out, struct job *jp, int mode)
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{
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int procno;
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int st;
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struct procstat *ps;
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int col;
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char s[64];
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#if JOBS
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if (mode & SHOW_PGID) {
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/* just output process (group) id of pipeline */
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outfmt(out, "%ld\n", (long)jp->ps->pid);
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return;
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}
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#endif
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procno = jp->nprocs;
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if (!procno)
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return;
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if (mode & SHOW_PID)
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mode |= SHOW_MULTILINE;
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if ((procno > 1 && !(mode & SHOW_MULTILINE))
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|| (mode & SHOW_SIGNALLED)) {
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/* See if we have more than one status to report */
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ps = jp->ps;
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st = ps->status;
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do {
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int st1 = ps->status;
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if (st1 != st)
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/* yes - need multi-line output */
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mode |= SHOW_MULTILINE;
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if (st1 == -1 || !(mode & SHOW_SIGNALLED) || WIFEXITED(st1))
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continue;
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if (WIFSTOPPED(st1) || ((st1 = WTERMSIG(st1) & 0x7f)
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&& st1 != SIGINT && st1 != SIGPIPE))
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mode |= SHOW_ISSIG;
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} while (ps++, --procno);
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procno = jp->nprocs;
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}
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if (mode & SHOW_SIGNALLED && !(mode & SHOW_ISSIG)) {
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if (jp->state == JOBDONE && !(mode & SHOW_NO_FREE)) {
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TRACE(("showjob: freeing job %d\n", jp - jobtab + 1));
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freejob(jp);
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}
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return;
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}
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for (ps = jp->ps; --procno >= 0; ps++) { /* for each process */
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if (ps == jp->ps)
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fmtstr(s, 16, "[%ld] %c ",
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(long)(jp - jobtab + 1),
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#if JOBS
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jp == jobtab + curjob ? '+' :
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curjob != -1 && jp == jobtab +
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jobtab[curjob].prev_job ? '-' :
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#endif
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' ');
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else
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fmtstr(s, 16, " " );
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col = strlen(s);
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if (mode & SHOW_PID) {
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fmtstr(s + col, 16, "%ld ", (long)ps->pid);
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col += strlen(s + col);
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}
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if (ps->status == -1) {
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scopy("Running", s + col);
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} else if (WIFEXITED(ps->status)) {
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st = WEXITSTATUS(ps->status);
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if (st)
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fmtstr(s + col, 16, "Done(%d)", st);
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else
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fmtstr(s + col, 16, "Done");
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} else {
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#if JOBS
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if (WIFSTOPPED(ps->status))
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st = WSTOPSIG(ps->status);
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else /* WIFSIGNALED(ps->status) */
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#endif
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st = WTERMSIG(ps->status);
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st &= 0x7f;
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if (st < NSIG && sys_siglist[st])
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scopyn(sys_siglist[st], s + col, 32);
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else
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fmtstr(s + col, 16, "Signal %d", st);
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if (WCOREDUMP(ps->status)) {
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col += strlen(s + col);
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scopyn(" (core dumped)", s + col, 64 - col);
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}
|
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}
|
|
col += strlen(s + col);
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outstr(s, out);
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do {
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outc(' ', out);
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col++;
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} while (col < 30);
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outstr(ps->cmd, out);
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if (mode & SHOW_MULTILINE) {
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if (procno > 0) {
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outc(' ', out);
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outc('|', out);
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}
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} else {
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while (--procno >= 0)
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outfmt(out, " | %s", (++ps)->cmd );
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}
|
|
outc('\n', out);
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}
|
|
flushout(out);
|
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jp->changed = 0;
|
|
if (jp->state == JOBDONE && !(mode & SHOW_NO_FREE))
|
|
freejob(jp);
|
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}
|
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|
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int
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jobscmd(int argc, char **argv)
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{
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int mode, m;
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int sv = jobs_invalid;
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jobs_invalid = 0;
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mode = 0;
|
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while ((m = nextopt("lp")))
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if (m == 'l')
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mode = SHOW_PID;
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else
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mode = SHOW_PGID;
|
|
if (*argptr)
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do
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showjob(out1, getjob(*argptr,0), mode);
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|
while (*++argptr);
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|
else
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|
showjobs(out1, mode);
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jobs_invalid = sv;
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return 0;
|
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}
|
|
|
|
|
|
/*
|
|
* Print a list of jobs. If "change" is nonzero, only print jobs whose
|
|
* statuses have changed since the last call to showjobs.
|
|
*
|
|
* 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
|
|
* will be freed here.
|
|
*/
|
|
|
|
void
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|
showjobs(struct output *out, int mode)
|
|
{
|
|
int jobno;
|
|
struct job *jp;
|
|
int silent = 0, gotpid;
|
|
|
|
TRACE(("showjobs(%x) called\n", mode));
|
|
|
|
/* If not even one one job changed, there is nothing to do */
|
|
gotpid = dowait(0, NULL);
|
|
while (dowait(0, NULL) > 0)
|
|
continue;
|
|
#ifdef JOBS
|
|
/*
|
|
* Check if we are not in our foreground group, and if not
|
|
* put us in it.
|
|
*/
|
|
if (mflag && gotpid != -1 && tcgetpgrp(ttyfd) != getpid()) {
|
|
if (tcsetpgrp(ttyfd, getpid()) == -1)
|
|
error("Cannot set tty process group (%s) at %d",
|
|
strerror(errno), __LINE__);
|
|
TRACE(("repaired tty process group\n"));
|
|
silent = 1;
|
|
}
|
|
#endif
|
|
if (jobs_invalid)
|
|
return;
|
|
|
|
for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
|
|
if (!jp->used)
|
|
continue;
|
|
if (jp->nprocs == 0) {
|
|
freejob(jp);
|
|
continue;
|
|
}
|
|
if ((mode & SHOW_CHANGED) && !jp->changed)
|
|
continue;
|
|
if (silent && jp->changed) {
|
|
jp->changed = 0;
|
|
continue;
|
|
}
|
|
showjob(out, jp, mode);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Mark a job structure as unused.
|
|
*/
|
|
|
|
STATIC void
|
|
freejob(struct job *jp)
|
|
{
|
|
INTOFF;
|
|
if (jp->ps != &jp->ps0) {
|
|
ckfree(jp->ps);
|
|
jp->ps = &jp->ps0;
|
|
}
|
|
jp->nprocs = 0;
|
|
jp->used = 0;
|
|
#if JOBS
|
|
set_curjob(jp, 0);
|
|
#endif
|
|
INTON;
|
|
}
|
|
|
|
|
|
|
|
int
|
|
waitcmd(int argc, char **argv)
|
|
{
|
|
struct job *job;
|
|
int status, retval;
|
|
struct job *jp;
|
|
|
|
nextopt("");
|
|
|
|
if (!*argptr) {
|
|
/* wait for all jobs */
|
|
jp = jobtab;
|
|
if (jobs_invalid)
|
|
return 0;
|
|
for (;;) {
|
|
if (jp >= jobtab + njobs) {
|
|
/* no running procs */
|
|
return 0;
|
|
}
|
|
if (!jp->used || jp->state != JOBRUNNING) {
|
|
jp++;
|
|
continue;
|
|
}
|
|
if (dowait(1, (struct job *)NULL) == -1)
|
|
return 128 + SIGINT;
|
|
jp = jobtab;
|
|
}
|
|
}
|
|
|
|
for (; *argptr; argptr++) {
|
|
job = getjob(*argptr, 1);
|
|
if (!job) {
|
|
retval = 127;
|
|
continue;
|
|
}
|
|
/* loop until process terminated or stopped */
|
|
while (job->state == JOBRUNNING) {
|
|
if (dowait(1, (struct job *)NULL) == -1)
|
|
return 128 + SIGINT;
|
|
}
|
|
status = job->ps[job->nprocs - 1].status;
|
|
if (WIFEXITED(status))
|
|
retval = WEXITSTATUS(status);
|
|
#if JOBS
|
|
else if (WIFSTOPPED(status))
|
|
retval = WSTOPSIG(status) + 128;
|
|
#endif
|
|
else {
|
|
/* XXX: limits number of signals */
|
|
retval = WTERMSIG(status) + 128;
|
|
}
|
|
if (!iflag)
|
|
freejob(job);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
|
|
|
|
int
|
|
jobidcmd(int argc, char **argv)
|
|
{
|
|
struct job *jp;
|
|
int i;
|
|
|
|
nextopt("");
|
|
jp = getjob(*argptr, 0);
|
|
for (i = 0 ; i < jp->nprocs ; ) {
|
|
out1fmt("%ld", (long)jp->ps[i].pid);
|
|
out1c(++i < jp->nprocs ? ' ' : '\n');
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
getjobpgrp(const char *name)
|
|
{
|
|
struct job *jp;
|
|
|
|
jp = getjob(name, 1);
|
|
if (jp == 0)
|
|
return 0;
|
|
return -jp->ps[0].pid;
|
|
}
|
|
|
|
/*
|
|
* Convert a job name to a job structure.
|
|
*/
|
|
|
|
STATIC struct job *
|
|
getjob(const char *name, int noerror)
|
|
{
|
|
int jobno = -1;
|
|
struct job *jp;
|
|
int pid;
|
|
int i;
|
|
const char *err_msg = "No such job: %s";
|
|
|
|
if (name == NULL) {
|
|
#if JOBS
|
|
jobno = curjob;
|
|
#endif
|
|
err_msg = "No current job";
|
|
} else if (name[0] == '%') {
|
|
if (is_number(name + 1)) {
|
|
jobno = number(name + 1) - 1;
|
|
} else if (!name[2]) {
|
|
switch (name[1]) {
|
|
#if JOBS
|
|
case 0:
|
|
case '+':
|
|
case '%':
|
|
jobno = curjob;
|
|
err_msg = "No current job";
|
|
break;
|
|
case '-':
|
|
jobno = curjob;
|
|
if (jobno != -1)
|
|
jobno = jobtab[jobno].prev_job;
|
|
err_msg = "No previous job";
|
|
break;
|
|
#endif
|
|
default:
|
|
goto check_pattern;
|
|
}
|
|
} else {
|
|
struct job *found;
|
|
check_pattern:
|
|
found = NULL;
|
|
for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
|
|
if (!jp->used || jp->nprocs <= 0)
|
|
continue;
|
|
if ((name[1] == '?'
|
|
&& strstr(jp->ps[0].cmd, name + 2))
|
|
|| prefix(name + 1, jp->ps[0].cmd)) {
|
|
if (found) {
|
|
err_msg = "%s: ambiguous";
|
|
found = 0;
|
|
break;
|
|
}
|
|
found = jp;
|
|
}
|
|
}
|
|
if (found)
|
|
return found;
|
|
}
|
|
|
|
} else if (is_number(name)) {
|
|
pid = number(name);
|
|
for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
|
|
if (jp->used && jp->nprocs > 0
|
|
&& jp->ps[jp->nprocs - 1].pid == pid)
|
|
return jp;
|
|
}
|
|
}
|
|
|
|
if (!jobs_invalid && jobno >= 0 && jobno < njobs) {
|
|
jp = jobtab + jobno;
|
|
if (jp->used)
|
|
return jp;
|
|
}
|
|
if (!noerror)
|
|
error(err_msg, name);
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Return a new job structure,
|
|
*/
|
|
|
|
struct job *
|
|
makejob(union node *node, int nprocs)
|
|
{
|
|
int i;
|
|
struct job *jp;
|
|
|
|
if (jobs_invalid) {
|
|
for (i = njobs, jp = jobtab ; --i >= 0 ; jp++) {
|
|
if (jp->used)
|
|
freejob(jp);
|
|
}
|
|
jobs_invalid = 0;
|
|
}
|
|
|
|
for (i = njobs, jp = jobtab ; ; jp++) {
|
|
if (--i < 0) {
|
|
INTOFF;
|
|
if (njobs == 0) {
|
|
jobtab = ckmalloc(4 * sizeof jobtab[0]);
|
|
} else {
|
|
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)
|
|
jp[i].ps = &jp[i].ps0;
|
|
ckfree(jobtab);
|
|
jobtab = jp;
|
|
}
|
|
jp = jobtab + njobs;
|
|
for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
|
|
INTON;
|
|
break;
|
|
}
|
|
if (jp->used == 0)
|
|
break;
|
|
}
|
|
INTOFF;
|
|
jp->state = JOBRUNNING;
|
|
jp->used = 1;
|
|
jp->changed = 0;
|
|
jp->nprocs = 0;
|
|
#if JOBS
|
|
jp->jobctl = jobctl;
|
|
set_curjob(jp, 1);
|
|
#endif
|
|
if (nprocs > 1) {
|
|
jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
|
|
} else {
|
|
jp->ps = &jp->ps0;
|
|
}
|
|
INTON;
|
|
TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs,
|
|
jp - jobtab + 1));
|
|
return jp;
|
|
}
|
|
|
|
|
|
/*
|
|
* Fork off 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(struct job *jp, union node *n, int mode)
|
|
{
|
|
int pid;
|
|
|
|
TRACE(("forkshell(%%%d, %p, %d) called\n", jp - jobtab, n, mode));
|
|
switch ((pid = fork())) {
|
|
case -1:
|
|
TRACE(("Fork failed, errno=%d", errno));
|
|
INTON;
|
|
error("Cannot fork");
|
|
break;
|
|
case 0:
|
|
forkchild(jp, n, mode, 0);
|
|
return 0;
|
|
default:
|
|
return forkparent(jp, n, mode, pid);
|
|
}
|
|
}
|
|
|
|
int
|
|
forkparent(struct job *jp, union node *n, int mode, pid_t pid)
|
|
{
|
|
int pgrp;
|
|
|
|
if (rootshell && mode != FORK_NOJOB && mflag) {
|
|
if (jp == NULL || jp->nprocs == 0)
|
|
pgrp = pid;
|
|
else
|
|
pgrp = jp->ps[0].pid;
|
|
/* This can fail because we are doing it in the child also */
|
|
(void)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[0] = 0;
|
|
#ifndef SMALL
|
|
if (/* iflag && rootshell && */ n)
|
|
commandtext(ps, n);
|
|
#endif
|
|
}
|
|
TRACE(("In parent shell: child = %d\n", pid));
|
|
return pid;
|
|
}
|
|
|
|
void
|
|
forkchild(struct job *jp, union node *n, int mode, int vforked)
|
|
{
|
|
int wasroot;
|
|
int pgrp;
|
|
const char *devnull = _PATH_DEVNULL;
|
|
const char *nullerr = "Can't open %s";
|
|
|
|
wasroot = rootshell;
|
|
TRACE(("Child shell %d\n", getpid()));
|
|
if (!vforked)
|
|
rootshell = 0;
|
|
|
|
closescript(vforked);
|
|
clear_traps(vforked);
|
|
#if JOBS
|
|
if (!vforked)
|
|
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;
|
|
/* This can fail because we are doing it in the parent also */
|
|
(void)setpgid(0, pgrp);
|
|
if (mode == FORK_FG) {
|
|
if (tcsetpgrp(ttyfd, pgrp) == -1)
|
|
error("Cannot set tty process group (%s) at %d",
|
|
strerror(errno), __LINE__);
|
|
}
|
|
setsignal(SIGTSTP, vforked);
|
|
setsignal(SIGTTOU, vforked);
|
|
} else if (mode == FORK_BG) {
|
|
ignoresig(SIGINT, vforked);
|
|
ignoresig(SIGQUIT, vforked);
|
|
if ((jp == NULL || jp->nprocs == 0) &&
|
|
! fd0_redirected_p ()) {
|
|
close(0);
|
|
if (open(devnull, O_RDONLY) != 0)
|
|
error(nullerr, devnull);
|
|
}
|
|
}
|
|
#else
|
|
if (mode == FORK_BG) {
|
|
ignoresig(SIGINT, vforked);
|
|
ignoresig(SIGQUIT, vforked);
|
|
if ((jp == NULL || jp->nprocs == 0) &&
|
|
! fd0_redirected_p ()) {
|
|
close(0);
|
|
if (open(devnull, O_RDONLY) != 0)
|
|
error(nullerr, devnull);
|
|
}
|
|
}
|
|
#endif
|
|
if (wasroot && iflag) {
|
|
setsignal(SIGINT, vforked);
|
|
setsignal(SIGQUIT, vforked);
|
|
setsignal(SIGTERM, vforked);
|
|
}
|
|
|
|
if (!vforked)
|
|
jobs_invalid = 1;
|
|
}
|
|
|
|
/*
|
|
* 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(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 == JOBRUNNING) {
|
|
dowait(1, jp);
|
|
}
|
|
#if JOBS
|
|
if (jp->jobctl) {
|
|
if (tcsetpgrp(ttyfd, mypgrp) == -1)
|
|
error("Cannot set tty process group (%s) at %d",
|
|
strerror(errno), __LINE__);
|
|
}
|
|
if (jp->state == JOBSTOPPED && curjob != jp - jobtab)
|
|
set_curjob(jp, 2);
|
|
#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;
|
|
TRACE(("waitforjob: job %d, nproc %d, status %x, st %x\n",
|
|
jp - jobtab + 1, jp->nprocs, status, st ));
|
|
#if JOBS
|
|
if (jp->jobctl) {
|
|
/*
|
|
* This is truly gross.
|
|
* If we're doing job control, then we did a TIOCSPGRP which
|
|
* caused us (the shell) to no longer be in the controlling
|
|
* session -- so we wouldn't have seen any ^C/SIGINT. So, we
|
|
* intuit from the subprocess exit status whether a SIGINT
|
|
* occurred, and if so interrupt ourselves. Yuck. - mycroft
|
|
*/
|
|
if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
|
|
raise(SIGINT);
|
|
}
|
|
#endif
|
|
if (! JOBS || jp->state == JOBDONE)
|
|
freejob(jp);
|
|
INTON;
|
|
return st;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Wait for a process to terminate.
|
|
*/
|
|
|
|
STATIC int
|
|
dowait(int block, struct job *job)
|
|
{
|
|
int pid;
|
|
int status;
|
|
struct procstat *sp;
|
|
struct job *jp;
|
|
struct job *thisjob;
|
|
int done;
|
|
int stopped;
|
|
extern volatile char gotsig[];
|
|
|
|
TRACE(("dowait(%d) called\n", block));
|
|
do {
|
|
pid = waitproc(block, job, &status);
|
|
TRACE(("wait returns pid %d, status %d\n", pid, status));
|
|
} while (pid == -1 && errno == EINTR && gotsig[SIGINT - 1] == 0);
|
|
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(("Job %d: changing status of proc %d from 0x%x to 0x%x\n", jp - jobtab + 1, 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)
|
|
set_curjob(jp, 0);
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (thisjob && thisjob->state != JOBRUNNING) {
|
|
int mode = 0;
|
|
if (!rootshell || !iflag)
|
|
mode = SHOW_SIGNALLED;
|
|
if (job == thisjob)
|
|
mode = SHOW_SIGNALLED | SHOW_NO_FREE;
|
|
if (mode)
|
|
showjob(out2, thisjob, mode);
|
|
else {
|
|
TRACE(("Not printing status, rootshell=%d, job=%p\n",
|
|
rootshell, job));
|
|
thisjob->changed = 1;
|
|
}
|
|
}
|
|
|
|
INTON;
|
|
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(int block, struct job *jp, int *status)
|
|
{
|
|
#ifdef BSD
|
|
int flags = 0;
|
|
|
|
#if JOBS
|
|
if (jp != NULL && jp->jobctl)
|
|
flags |= WUNTRACED;
|
|
#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(void)
|
|
{
|
|
int jobno;
|
|
struct job *jp;
|
|
|
|
if (job_warning || jobs_invalid)
|
|
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;
|
|
|
|
void
|
|
commandtext(struct procstat *ps, union node *n)
|
|
{
|
|
int len;
|
|
|
|
cmdnextc = ps->cmd;
|
|
if (iflag || mflag)
|
|
len = sizeof(ps->cmd);
|
|
else
|
|
len = sizeof(ps->cmd) / 10;
|
|
cmdnleft = len;
|
|
cmdtxt(n);
|
|
if (cmdnleft <= 0) {
|
|
char *p = ps->cmd + len - 4;
|
|
p[0] = '.';
|
|
p[1] = '.';
|
|
p[2] = '.';
|
|
p[3] = 0;
|
|
} else
|
|
*cmdnextc = '\0';
|
|
TRACE(("commandtext: ps->cmd %x, end %x, left %d\n\t\"%s\"\n",
|
|
ps->cmd, cmdnextc, cmdnleft, ps->cmd));
|
|
}
|
|
|
|
|
|
STATIC void
|
|
cmdtxt(union node *n)
|
|
{
|
|
union node *np;
|
|
struct nodelist *lp;
|
|
const char *p;
|
|
int i;
|
|
char s[2];
|
|
|
|
if (n == NULL || cmdnleft <= 0)
|
|
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);
|
|
if (n->nif.elsepart) {
|
|
cmdputs("; else ");
|
|
cmdtxt(n->nif.elsepart);
|
|
}
|
|
cmdputs("; fi");
|
|
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 ");
|
|
cmdlist(n->nfor.args, 1);
|
|
cmdputs("; do ");
|
|
cmdtxt(n->nfor.body);
|
|
cmdputs("; done");
|
|
break;
|
|
case NCASE:
|
|
cmdputs("case ");
|
|
cmdputs(n->ncase.expr->narg.text);
|
|
cmdputs(" in ");
|
|
for (np = n->ncase.cases; np; np = np->nclist.next) {
|
|
cmdtxt(np->nclist.pattern);
|
|
cmdputs(") ");
|
|
cmdtxt(np->nclist.body);
|
|
cmdputs(";; ");
|
|
}
|
|
cmdputs("esac");
|
|
break;
|
|
case NDEFUN:
|
|
cmdputs(n->narg.text);
|
|
cmdputs("() { ... }");
|
|
break;
|
|
case NCMD:
|
|
cmdlist(n->ncmd.args, 1);
|
|
cmdlist(n->ncmd.redirect, 0);
|
|
break;
|
|
case NARG:
|
|
cmdputs(n->narg.text);
|
|
break;
|
|
case NTO:
|
|
p = ">"; i = 1; goto redir;
|
|
case NCLOBBER:
|
|
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;
|
|
case NFROMTO:
|
|
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
|
|
cmdlist(union node *np, int sep)
|
|
{
|
|
for (; np; np = np->narg.next) {
|
|
if (!sep)
|
|
cmdputs(" ");
|
|
cmdtxt(np);
|
|
if (sep && np->narg.next)
|
|
cmdputs(" ");
|
|
}
|
|
}
|
|
|
|
|
|
STATIC void
|
|
cmdputs(const char *s)
|
|
{
|
|
const char *p, *str = 0;
|
|
char c, cc[2] = " ";
|
|
char *nextc;
|
|
int nleft;
|
|
int subtype = 0;
|
|
int quoted = 0;
|
|
static char vstype[16][4] = { "", "}", "-", "+", "?", "=",
|
|
"#", "##", "%", "%%" };
|
|
|
|
p = s;
|
|
nextc = cmdnextc;
|
|
nleft = cmdnleft;
|
|
while (nleft > 0 && (c = *p++) != 0) {
|
|
switch (c) {
|
|
case CTLESC:
|
|
c = *p++;
|
|
break;
|
|
case CTLVAR:
|
|
subtype = *p++;
|
|
if ((subtype & VSTYPE) == VSLENGTH)
|
|
str = "${#";
|
|
else
|
|
str = "${";
|
|
if (!(subtype & VSQUOTE) != !(quoted & 1)) {
|
|
quoted ^= 1;
|
|
c = '"';
|
|
} else
|
|
c = *str++;
|
|
break;
|
|
case CTLENDVAR:
|
|
if (quoted & 1) {
|
|
c = '"';
|
|
str = "}";
|
|
} else
|
|
c = '}';
|
|
quoted >>= 1;
|
|
subtype = 0;
|
|
break;
|
|
case CTLBACKQ:
|
|
c = '$';
|
|
str = "(...)";
|
|
break;
|
|
case CTLBACKQ+CTLQUOTE:
|
|
c = '"';
|
|
str = "$(...)\"";
|
|
break;
|
|
case CTLARI:
|
|
c = '$';
|
|
str = "((";
|
|
break;
|
|
case CTLENDARI:
|
|
c = ')';
|
|
str = ")";
|
|
break;
|
|
case CTLQUOTEMARK:
|
|
quoted ^= 1;
|
|
c = '"';
|
|
break;
|
|
case '=':
|
|
if (subtype == 0)
|
|
break;
|
|
str = vstype[subtype & VSTYPE];
|
|
if (subtype & VSNUL)
|
|
c = ':';
|
|
else
|
|
c = *str++;
|
|
if (c != '}')
|
|
quoted <<= 1;
|
|
break;
|
|
case '\'':
|
|
case '\\':
|
|
case '"':
|
|
case '$':
|
|
/* These can only happen inside quotes */
|
|
cc[0] = c;
|
|
str = cc;
|
|
c = '\\';
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
do {
|
|
*nextc++ = c;
|
|
} while (--nleft > 0 && str && (c = *str++));
|
|
str = 0;
|
|
}
|
|
if ((quoted & 1) && nleft) {
|
|
*nextc++ = '"';
|
|
nleft--;
|
|
}
|
|
cmdnleft = nleft;
|
|
cmdnextc = nextc;
|
|
}
|