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freebsd-skq/bin/sh/jobs.c
cracauer 6a8fae4553 Commit fix sent by Tor Egge <Tor.Egge@cvsup.no.freebsd.org> 
Only use return value from system call if system call succeeded.

Tested with `make world` and some of my own scripts.

This should be MFCed soon.  While /bin/sh is hard to test the fix is
obviously correct and can be assumed not to break something else
(famous last words...).
2004-02-05 22:34:05 +00:00

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/*-
* 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"
STATIC struct job *jobtab; /* array of jobs */
STATIC int njobs; /* size of array */
MKINIT pid_t backgndpid = -1; /* pid of last background process */
#if JOBS
STATIC struct job *jobmru; /* most recently used job list */
STATIC 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 = fcntl(i, F_DUPFD, 10)) < 0)
goto out;
}
if (ttyfd < 10) {
/*
* Keep our TTY file descriptor out of the way of
* the user's redirections.
*/
if ((i = fcntl(ttyfd, F_DUPFD, 10)) < 0) {
close(ttyfd);
ttyfd = -1;
goto out;
}
close(ttyfd);
ttyfd = i;
}
if (fcntl(ttyfd, F_SETFD, FD_CLOEXEC) < 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, "[%td] ", 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) < sys_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;
flushall();
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) ||
(pid > 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 (!mflag ||
(thisjob->foreground && !WIFSTOPPED(status))) {
i = WTERMSIG(status);
if ((i & 0x7F) < sys_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, 0);
}
} else {
TRACE(("Not printing status, rootshell=%d, job=%p\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;
}
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