4f8fa749f0
forkshell() after it has been freed. This caused mysterious behaviour when anything but the first command in a pipeline tried to access the terminal when the `junk' malloc() option was enabled (which is the default).
1230 lines
25 KiB
C
1230 lines
25 KiB
C
/*-
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Kenneth Almquist.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95";
|
|
#endif
|
|
#endif /* not lint */
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
#include <paths.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <sys/param.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
#include <paths.h>
|
|
#include <sys/ioctl.h>
|
|
|
|
#include "shell.h"
|
|
#if JOBS
|
|
#include <termios.h>
|
|
#undef CEOF /* syntax.h redefines this */
|
|
#endif
|
|
#include "redir.h"
|
|
#include "show.h"
|
|
#include "main.h"
|
|
#include "parser.h"
|
|
#include "nodes.h"
|
|
#include "jobs.h"
|
|
#include "options.h"
|
|
#include "trap.h"
|
|
#include "syntax.h"
|
|
#include "input.h"
|
|
#include "output.h"
|
|
#include "memalloc.h"
|
|
#include "error.h"
|
|
#include "mystring.h"
|
|
|
|
|
|
struct job *jobtab; /* array of jobs */
|
|
int njobs; /* size of array */
|
|
MKINIT pid_t backgndpid = -1; /* pid of last background process */
|
|
#if JOBS
|
|
struct job *jobmru; /* most recently used job list */
|
|
pid_t initialpgrp; /* pgrp of shell on invocation */
|
|
#endif
|
|
int in_waitcmd = 0; /* are we in waitcmd()? */
|
|
int in_dowait = 0; /* are we in dowait()? */
|
|
volatile sig_atomic_t breakwaitcmd = 0; /* should wait be terminated? */
|
|
static int ttyfd = -1;
|
|
|
|
#if JOBS
|
|
STATIC void restartjob(struct job *);
|
|
#endif
|
|
STATIC void freejob(struct job *);
|
|
STATIC struct job *getjob(char *);
|
|
STATIC pid_t dowait(int, struct job *);
|
|
STATIC pid_t waitproc(int, int *);
|
|
STATIC void cmdtxt(union node *);
|
|
STATIC void cmdputs(char *);
|
|
#if JOBS
|
|
STATIC void setcurjob(struct job *);
|
|
STATIC void deljob(struct job *);
|
|
STATIC struct job *getcurjob(struct job *);
|
|
#endif
|
|
STATIC void showjob(struct job *, pid_t, int, int);
|
|
|
|
|
|
/*
|
|
* Turn job control on and off.
|
|
*/
|
|
|
|
MKINIT int jobctl;
|
|
|
|
#if JOBS
|
|
void
|
|
setjobctl(int on)
|
|
{
|
|
int i;
|
|
|
|
if (on == jobctl || rootshell == 0)
|
|
return;
|
|
if (on) {
|
|
if (ttyfd != -1)
|
|
close(ttyfd);
|
|
if ((ttyfd = open(_PATH_TTY, O_RDWR)) < 0) {
|
|
i = 0;
|
|
while (i <= 2 && !isatty(i))
|
|
i++;
|
|
if (i > 2 || (ttyfd = dup(i)) < 0)
|
|
goto out;
|
|
}
|
|
if (fcntl(ttyfd, FD_CLOEXEC, 1) < 0) {
|
|
close(ttyfd);
|
|
ttyfd = -1;
|
|
goto out;
|
|
}
|
|
do { /* while we are in the background */
|
|
initialpgrp = tcgetpgrp(ttyfd);
|
|
if (initialpgrp < 0) {
|
|
out: out2str("sh: can't access tty; job control turned off\n");
|
|
mflag = 0;
|
|
return;
|
|
}
|
|
if (initialpgrp == -1)
|
|
initialpgrp = getpgrp();
|
|
else if (initialpgrp != getpgrp()) {
|
|
killpg(0, SIGTTIN);
|
|
continue;
|
|
}
|
|
} while (0);
|
|
setsignal(SIGTSTP);
|
|
setsignal(SIGTTOU);
|
|
setsignal(SIGTTIN);
|
|
setpgid(0, rootpid);
|
|
tcsetpgrp(ttyfd, rootpid);
|
|
} else { /* turning job control off */
|
|
setpgid(0, initialpgrp);
|
|
tcsetpgrp(ttyfd, initialpgrp);
|
|
close(ttyfd);
|
|
ttyfd = -1;
|
|
setsignal(SIGTSTP);
|
|
setsignal(SIGTTOU);
|
|
setsignal(SIGTTIN);
|
|
}
|
|
jobctl = on;
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef mkinit
|
|
INCLUDE <sys/types.h>
|
|
INCLUDE <stdlib.h>
|
|
|
|
SHELLPROC {
|
|
backgndpid = -1;
|
|
#if JOBS
|
|
jobctl = 0;
|
|
#endif
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#if JOBS
|
|
int
|
|
fgcmd(int argc __unused, char **argv)
|
|
{
|
|
struct job *jp;
|
|
pid_t pgrp;
|
|
int status;
|
|
|
|
jp = getjob(argv[1]);
|
|
if (jp->jobctl == 0)
|
|
error("job not created under job control");
|
|
out1str(jp->ps[0].cmd);
|
|
out1c('\n');
|
|
flushout(&output);
|
|
pgrp = jp->ps[0].pid;
|
|
tcsetpgrp(ttyfd, pgrp);
|
|
restartjob(jp);
|
|
jp->foreground = 1;
|
|
INTOFF;
|
|
status = waitforjob(jp, (int *)NULL);
|
|
INTON;
|
|
return status;
|
|
}
|
|
|
|
|
|
int
|
|
bgcmd(int argc, char **argv)
|
|
{
|
|
char s[64];
|
|
struct job *jp;
|
|
|
|
do {
|
|
jp = getjob(*++argv);
|
|
if (jp->jobctl == 0)
|
|
error("job not created under job control");
|
|
if (jp->state == JOBDONE)
|
|
continue;
|
|
restartjob(jp);
|
|
jp->foreground = 0;
|
|
fmtstr(s, 64, "[%d] ", jp - jobtab + 1);
|
|
out1str(s);
|
|
out1str(jp->ps[0].cmd);
|
|
out1c('\n');
|
|
} while (--argc > 1);
|
|
return 0;
|
|
}
|
|
|
|
|
|
STATIC void
|
|
restartjob(struct job *jp)
|
|
{
|
|
struct procstat *ps;
|
|
int i;
|
|
|
|
if (jp->state == JOBDONE)
|
|
return;
|
|
setcurjob(jp);
|
|
INTOFF;
|
|
killpg(jp->ps[0].pid, SIGCONT);
|
|
for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
|
|
if (WIFSTOPPED(ps->status)) {
|
|
ps->status = -1;
|
|
jp->state = 0;
|
|
}
|
|
}
|
|
INTON;
|
|
}
|
|
#endif
|
|
|
|
|
|
int
|
|
jobscmd(int argc, char *argv[])
|
|
{
|
|
char *id;
|
|
int ch, sformat, lformat;
|
|
|
|
optind = optreset = 1;
|
|
opterr = 0;
|
|
sformat = lformat = 0;
|
|
while ((ch = getopt(argc, argv, "ls")) != -1) {
|
|
switch (ch) {
|
|
case 'l':
|
|
lformat = 1;
|
|
break;
|
|
case 's':
|
|
sformat = 1;
|
|
break;
|
|
case '?':
|
|
default:
|
|
error("unknown option: -%c", optopt);
|
|
}
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (argc == 0)
|
|
showjobs(0, sformat, lformat);
|
|
else
|
|
while ((id = *argv++) != NULL)
|
|
showjob(getjob(id), 0, sformat, lformat);
|
|
|
|
return (0);
|
|
}
|
|
|
|
STATIC void
|
|
showjob(struct job *jp, pid_t pid, int sformat, int lformat)
|
|
{
|
|
char s[64];
|
|
struct procstat *ps;
|
|
struct job *j;
|
|
int col, curr, i, jobno, prev, procno;
|
|
char c;
|
|
|
|
procno = jp->nprocs;
|
|
jobno = jp - jobtab + 1;
|
|
curr = prev = 0;
|
|
#if JOBS
|
|
if ((j = getcurjob(NULL)) != NULL) {
|
|
curr = j - jobtab + 1;
|
|
if ((j = getcurjob(j)) != NULL)
|
|
prev = j - jobtab + 1;
|
|
}
|
|
#endif
|
|
for (ps = jp->ps ; ; ps++) { /* for each process */
|
|
if (sformat) {
|
|
out1fmt("%d\n", (int)ps->pid);
|
|
goto skip;
|
|
}
|
|
if (!lformat && ps != jp->ps && pid == 0)
|
|
goto skip;
|
|
if (pid != 0 && pid != ps->pid)
|
|
goto skip;
|
|
if (jobno == curr && ps == jp->ps)
|
|
c = '+';
|
|
else if (jobno == prev && ps == jp->ps)
|
|
c = '-';
|
|
else
|
|
c = ' ';
|
|
if (ps == jp->ps)
|
|
fmtstr(s, 64, "[%d] %c ", jobno, c);
|
|
else
|
|
fmtstr(s, 64, " %c ", c);
|
|
out1str(s);
|
|
col = strlen(s);
|
|
if (lformat) {
|
|
fmtstr(s, 64, "%d ", (int)ps->pid);
|
|
out1str(s);
|
|
col += strlen(s);
|
|
}
|
|
s[0] = '\0';
|
|
if (ps != jp->ps) {
|
|
*s = '\0';
|
|
} else if (ps->status == -1) {
|
|
strcpy(s, "Running");
|
|
} else if (WIFEXITED(ps->status)) {
|
|
if (WEXITSTATUS(ps->status) == 0)
|
|
strcpy(s, "Done");
|
|
else
|
|
fmtstr(s, 64, "Done (%d)",
|
|
WEXITSTATUS(ps->status));
|
|
} else {
|
|
#if JOBS
|
|
if (WIFSTOPPED(ps->status))
|
|
i = WSTOPSIG(ps->status);
|
|
else
|
|
#endif
|
|
i = WTERMSIG(ps->status);
|
|
if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F])
|
|
scopy(sys_siglist[i & 0x7F], s);
|
|
else
|
|
fmtstr(s, 64, "Signal %d", i & 0x7F);
|
|
if (WCOREDUMP(ps->status))
|
|
strcat(s, " (core dumped)");
|
|
}
|
|
out1str(s);
|
|
col += strlen(s);
|
|
do {
|
|
out1c(' ');
|
|
col++;
|
|
} while (col < 30);
|
|
out1str(ps->cmd);
|
|
out1c('\n');
|
|
skip: if (--procno <= 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
* result may be a job structure containing zero processes. Such structures
|
|
* will be freed here.
|
|
*/
|
|
|
|
void
|
|
showjobs(int change, int sformat, int lformat)
|
|
{
|
|
int jobno;
|
|
struct job *jp;
|
|
|
|
TRACE(("showjobs(%d) called\n", change));
|
|
while (dowait(0, (struct job *)NULL) > 0);
|
|
for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
|
|
if (! jp->used)
|
|
continue;
|
|
if (jp->nprocs == 0) {
|
|
freejob(jp);
|
|
continue;
|
|
}
|
|
if (change && ! jp->changed)
|
|
continue;
|
|
showjob(jp, 0, sformat, lformat);
|
|
jp->changed = 0;
|
|
if (jp->state == JOBDONE) {
|
|
freejob(jp);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Mark a job structure as unused.
|
|
*/
|
|
|
|
STATIC void
|
|
freejob(struct job *jp)
|
|
{
|
|
struct procstat *ps;
|
|
int i;
|
|
|
|
INTOFF;
|
|
for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
|
|
if (ps->cmd != nullstr)
|
|
ckfree(ps->cmd);
|
|
}
|
|
if (jp->ps != &jp->ps0)
|
|
ckfree(jp->ps);
|
|
jp->used = 0;
|
|
#if JOBS
|
|
deljob(jp);
|
|
#endif
|
|
INTON;
|
|
}
|
|
|
|
|
|
|
|
int
|
|
waitcmd(int argc, char **argv)
|
|
{
|
|
struct job *job;
|
|
int status, retval;
|
|
struct job *jp;
|
|
|
|
if (argc > 1) {
|
|
job = getjob(argv[1]);
|
|
} else {
|
|
job = NULL;
|
|
}
|
|
|
|
/*
|
|
* Loop until a process is terminated or stopped, or a SIGINT is
|
|
* received.
|
|
*/
|
|
|
|
in_waitcmd++;
|
|
do {
|
|
if (job != NULL) {
|
|
if (job->state) {
|
|
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
|
|
retval = WTERMSIG(status) + 128;
|
|
if (! iflag)
|
|
freejob(job);
|
|
in_waitcmd--;
|
|
return retval;
|
|
}
|
|
} else {
|
|
for (jp = jobtab ; ; jp++) {
|
|
if (jp >= jobtab + njobs) { /* no running procs */
|
|
in_waitcmd--;
|
|
return 0;
|
|
}
|
|
if (jp->used && jp->state == 0)
|
|
break;
|
|
}
|
|
}
|
|
} while (dowait(1, (struct job *)NULL) != -1);
|
|
in_waitcmd--;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
int
|
|
jobidcmd(int argc __unused, char **argv)
|
|
{
|
|
struct job *jp;
|
|
int i;
|
|
|
|
jp = getjob(argv[1]);
|
|
for (i = 0 ; i < jp->nprocs ; ) {
|
|
out1fmt("%d", (int)jp->ps[i].pid);
|
|
out1c(++i < jp->nprocs? ' ' : '\n');
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Convert a job name to a job structure.
|
|
*/
|
|
|
|
STATIC struct job *
|
|
getjob(char *name)
|
|
{
|
|
int jobno;
|
|
struct job *found, *jp;
|
|
pid_t pid;
|
|
int i;
|
|
|
|
if (name == NULL) {
|
|
#if JOBS
|
|
currentjob: if ((jp = getcurjob(NULL)) == NULL)
|
|
error("No current job");
|
|
return (jp);
|
|
#else
|
|
error("No current job");
|
|
#endif
|
|
} else if (name[0] == '%') {
|
|
if (is_digit(name[1])) {
|
|
jobno = number(name + 1);
|
|
if (jobno > 0 && jobno <= njobs
|
|
&& jobtab[jobno - 1].used != 0)
|
|
return &jobtab[jobno - 1];
|
|
#if JOBS
|
|
} else if (name[1] == '%' && name[2] == '\0') {
|
|
goto currentjob;
|
|
} else if (name[1] == '+' && name[2] == '\0') {
|
|
goto currentjob;
|
|
} else if (name[1] == '-' && name[2] == '\0') {
|
|
if ((jp = getcurjob(NULL)) == NULL ||
|
|
(jp = getcurjob(jp)) == NULL)
|
|
error("No previous job");
|
|
return (jp);
|
|
#endif
|
|
} else if (name[1] == '?') {
|
|
found = NULL;
|
|
for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
|
|
if (jp->used && jp->nprocs > 0
|
|
&& strstr(jp->ps[0].cmd, name + 2) != NULL) {
|
|
if (found)
|
|
error("%s: ambiguous", name);
|
|
found = jp;
|
|
}
|
|
}
|
|
if (found != NULL)
|
|
return (found);
|
|
} else {
|
|
found = NULL;
|
|
for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
|
|
if (jp->used && jp->nprocs > 0
|
|
&& prefix(name + 1, jp->ps[0].cmd)) {
|
|
if (found)
|
|
error("%s: ambiguous", name);
|
|
found = jp;
|
|
}
|
|
}
|
|
if (found)
|
|
return found;
|
|
}
|
|
} else if (is_number(name)) {
|
|
pid = (pid_t)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;
|
|
}
|
|
}
|
|
error("No such job: %s", name);
|
|
/*NOTREACHED*/
|
|
return NULL;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Return a new job structure,
|
|
*/
|
|
|
|
struct job *
|
|
makejob(union node *node __unused, int nprocs)
|
|
{
|
|
int i;
|
|
struct job *jp;
|
|
|
|
for (i = njobs, jp = jobtab ; ; jp++) {
|
|
if (--i < 0) {
|
|
INTOFF;
|
|
if (njobs == 0) {
|
|
jobtab = ckmalloc(4 * sizeof jobtab[0]);
|
|
#if JOBS
|
|
jobmru = NULL;
|
|
#endif
|
|
} else {
|
|
jp = ckmalloc((njobs + 4) * sizeof jobtab[0]);
|
|
memcpy(jp, jobtab, njobs * sizeof jp[0]);
|
|
#if JOBS
|
|
/* Relocate `next' pointers and list head */
|
|
if (jobmru != NULL)
|
|
jobmru = &jp[jobmru - jobtab];
|
|
for (i = 0; i < njobs; i++)
|
|
if (jp[i].next != NULL)
|
|
jp[i].next = &jp[jp[i].next -
|
|
jobtab];
|
|
#endif
|
|
/* 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 = 0;
|
|
jp->used = 1;
|
|
jp->changed = 0;
|
|
jp->nprocs = 0;
|
|
jp->foreground = 0;
|
|
#if JOBS
|
|
jp->jobctl = jobctl;
|
|
jp->next = NULL;
|
|
#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;
|
|
}
|
|
|
|
#if JOBS
|
|
STATIC void
|
|
setcurjob(struct job *cj)
|
|
{
|
|
struct job *jp, *prev;
|
|
|
|
for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) {
|
|
if (jp == cj) {
|
|
if (prev != NULL)
|
|
prev->next = jp->next;
|
|
else
|
|
jobmru = jp->next;
|
|
jp->next = jobmru;
|
|
jobmru = cj;
|
|
return;
|
|
}
|
|
}
|
|
cj->next = jobmru;
|
|
jobmru = cj;
|
|
}
|
|
|
|
STATIC void
|
|
deljob(struct job *j)
|
|
{
|
|
struct job *jp, *prev;
|
|
|
|
for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) {
|
|
if (jp == j) {
|
|
if (prev != NULL)
|
|
prev->next = jp->next;
|
|
else
|
|
jobmru = jp->next;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return the most recently used job that isn't `nj', and preferably one
|
|
* that is stopped.
|
|
*/
|
|
STATIC struct job *
|
|
getcurjob(struct job *nj)
|
|
{
|
|
struct job *jp;
|
|
|
|
/* Try to find a stopped one.. */
|
|
for (jp = jobmru; jp != NULL; jp = jp->next)
|
|
if (jp->used && jp != nj && jp->state == JOBSTOPPED)
|
|
return (jp);
|
|
/* Otherwise the most recently used job that isn't `nj' */
|
|
for (jp = jobmru; jp != NULL; jp = jp->next)
|
|
if (jp->used && jp != nj)
|
|
return (jp);
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* 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).
|
|
*/
|
|
|
|
pid_t
|
|
forkshell(struct job *jp, union node *n, int mode)
|
|
{
|
|
pid_t pid;
|
|
pid_t 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: %s", strerror(errno));
|
|
}
|
|
if (pid == 0) {
|
|
struct job *p;
|
|
int wasroot;
|
|
int i;
|
|
|
|
TRACE(("Child shell %d\n", (int)getpid()));
|
|
wasroot = rootshell;
|
|
rootshell = 0;
|
|
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 ***/
|
|
if (tcsetpgrp(ttyfd, pgrp) < 0)
|
|
error("tcsetpgrp failed, errno=%d", errno);
|
|
}
|
|
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(_PATH_DEVNULL, O_RDONLY) != 0)
|
|
error("Can't open %s: %s",
|
|
_PATH_DEVNULL, strerror(errno));
|
|
}
|
|
}
|
|
#else
|
|
if (mode == FORK_BG) {
|
|
ignoresig(SIGINT);
|
|
ignoresig(SIGQUIT);
|
|
if ((jp == NULL || jp->nprocs == 0) &&
|
|
! fd0_redirected_p ()) {
|
|
close(0);
|
|
if (open(_PATH_DEVNULL, O_RDONLY) != 0)
|
|
error("Can't open %s: %s",
|
|
_PATH_DEVNULL, strerror(errno));
|
|
}
|
|
}
|
|
#endif
|
|
INTOFF;
|
|
for (i = njobs, p = jobtab ; --i >= 0 ; p++)
|
|
if (p->used)
|
|
freejob(p);
|
|
INTON;
|
|
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);
|
|
jp->foreground = mode == FORK_FG;
|
|
#if JOBS
|
|
setcurjob(jp);
|
|
#endif
|
|
}
|
|
INTON;
|
|
TRACE(("In parent shell: child = %d\n", (int)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
|
|
* foreground 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, int *origstatus)
|
|
{
|
|
#if JOBS
|
|
pid_t mypgrp = getpgrp();
|
|
#endif
|
|
int status;
|
|
int st;
|
|
|
|
INTOFF;
|
|
TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1));
|
|
while (jp->state == 0)
|
|
if (dowait(1, jp) == -1)
|
|
dotrap();
|
|
#if JOBS
|
|
if (jp->jobctl) {
|
|
if (tcsetpgrp(ttyfd, mypgrp) < 0)
|
|
error("tcsetpgrp failed, errno=%d\n", errno);
|
|
}
|
|
if (jp->state == JOBSTOPPED)
|
|
setcurjob(jp);
|
|
#endif
|
|
status = jp->ps[jp->nprocs - 1].status;
|
|
if (origstatus != NULL)
|
|
*origstatus = 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);
|
|
if (int_pending()) {
|
|
if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
|
|
kill(getpid(), SIGINT);
|
|
else
|
|
CLEAR_PENDING_INT;
|
|
}
|
|
INTON;
|
|
return st;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Wait for a process to terminate.
|
|
*/
|
|
|
|
STATIC pid_t
|
|
dowait(int block, struct job *job)
|
|
{
|
|
pid_t pid;
|
|
int status;
|
|
struct procstat *sp;
|
|
struct job *jp;
|
|
struct job *thisjob;
|
|
int done;
|
|
int stopped;
|
|
int sig;
|
|
int i;
|
|
|
|
in_dowait++;
|
|
TRACE(("dowait(%d) called\n", block));
|
|
do {
|
|
pid = waitproc(block, &status);
|
|
TRACE(("wait returns %d, status=%d\n", (int)pid, status));
|
|
} while ((pid == -1 && errno == EINTR && breakwaitcmd == 0) ||
|
|
(WIFSTOPPED(status) && !iflag));
|
|
in_dowait--;
|
|
if (breakwaitcmd != 0) {
|
|
breakwaitcmd = 0;
|
|
return -1;
|
|
}
|
|
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",
|
|
(int)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)
|
|
deljob(jp);
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
}
|
|
INTON;
|
|
if (! rootshell || ! iflag || (job && thisjob == job)) {
|
|
#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->foreground && !WIFSTOPPED(status)) {
|
|
i = WTERMSIG(status);
|
|
if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F])
|
|
out1str(sys_siglist[i & 0x7F]);
|
|
else
|
|
out1fmt("Signal %d", i & 0x7F);
|
|
if (WCOREDUMP(status))
|
|
out1str(" (core dumped)");
|
|
out1c('\n');
|
|
} else
|
|
showjob(thisjob, pid, 0, 1);
|
|
}
|
|
} 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.
|
|
*/
|
|
STATIC pid_t
|
|
waitproc(int block, int *status)
|
|
{
|
|
int flags;
|
|
|
|
#if JOBS
|
|
flags = WUNTRACED;
|
|
#else
|
|
flags = 0;
|
|
#endif
|
|
if (block == 0)
|
|
flags |= WNOHANG;
|
|
return wait3(status, flags, (struct rusage *)NULL);
|
|
}
|
|
|
|
/*
|
|
* return 1 if there are stopped jobs, otherwise 0
|
|
*/
|
|
int job_warning = 0;
|
|
int
|
|
stoppedjobs(void)
|
|
{
|
|
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;
|
|
#define MAXCMDTEXT 200
|
|
|
|
char *
|
|
commandtext(union node *n)
|
|
{
|
|
char *name;
|
|
|
|
cmdnextc = name = ckmalloc(MAXCMDTEXT);
|
|
cmdnleft = MAXCMDTEXT - 4;
|
|
cmdtxt(n);
|
|
*cmdnextc = '\0';
|
|
return name;
|
|
}
|
|
|
|
|
|
STATIC void
|
|
cmdtxt(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 NCLOBBER:
|
|
p = ">|"; i = 1; goto redir;
|
|
case NFROM:
|
|
p = "<"; i = 0; goto redir;
|
|
case NFROMTO:
|
|
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) {
|
|
if (n->ndup.dupfd >= 0)
|
|
s[0] = n->ndup.dupfd + '0';
|
|
else
|
|
s[0] = '-';
|
|
s[1] = '\0';
|
|
cmdputs(s);
|
|
} else {
|
|
cmdtxt(n->nfile.fname);
|
|
}
|
|
break;
|
|
case NHERE:
|
|
case NXHERE:
|
|
cmdputs("<<...");
|
|
break;
|
|
default:
|
|
cmdputs("???");
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
STATIC void
|
|
cmdputs(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;
|
|
}
|