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/*
* libdpkg - Debian packaging suite library routines
* subproc.c - subprocess helper routines
*
* Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
* Copyright © 2008-2014 Guillem Jover <guillem@debian.org>
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <dpkg/i18n.h>
#include <dpkg/dpkg.h>
#include <dpkg/subproc.h>
static int signo_ignores[] = { SIGQUIT, SIGINT };
static struct sigaction sa_save[array_count(signo_ignores)];
static void
subproc_reset_signal(int sig, struct sigaction *sa_old)
{
if (sigaction(sig, sa_old, NULL)) {
fprintf(stderr, _("error un-catching signal %s: %s\n"),
strsignal(sig), strerror(errno));
onerr_abort++;
}
}
static void
subproc_set_signal(int sig, struct sigaction *sa, struct sigaction *sa_old,
const char *name)
{
if (sigaction(sig, sa, sa_old))
ohshite(_("unable to ignore signal %s before running %.250s"),
strsignal(sig), name);
}
void
subproc_signals_ignore(const char *name)
{
struct sigaction sa;
size_t i;
onerr_abort++;
memset(&sa, 0, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
for (i = 0; i < array_count(signo_ignores); i++)
subproc_set_signal(signo_ignores[i], &sa, &sa_save[i], name);
push_cleanup(subproc_signals_cleanup, ~0, 0);
onerr_abort--;
}
void
subproc_signals_cleanup(int argc, void **argv)
{
size_t i;
for (i = 0; i < array_count(signo_ignores); i++)
subproc_reset_signal(signo_ignores[i], &sa_save[i]);
}
void
subproc_signals_restore(void)
{
pop_cleanup(ehflag_normaltidy);
}
static void
print_subproc_error(const char *emsg, const void *data)
{
fprintf(stderr, _("%s (subprocess): %s\n"), dpkg_get_progname(), emsg);
}
pid_t
subproc_fork(void)
{
pid_t pid;
pid = fork();
if (pid == -1) {
onerr_abort++;
ohshite(_("fork failed"));
}
if (pid > 0)
return pid;
/* Push a new error context, so that we don't do the other cleanups,
* because they'll be done by/in the parent process. */
push_error_context_func(catch_fatal_error, print_subproc_error, NULL);
return pid;
}
static int
subproc_check(int status, const char *desc, enum subproc_flags flags)
{
void (*out)(const char *fmt, ...) DPKG_ATTR_PRINTF(1);
int n;
if (flags & SUBPROC_WARN)
out = warning;
else
out = ohshit;
if (WIFEXITED(status)) {
n = WEXITSTATUS(status);
if (!n)
return 0;
if (flags & SUBPROC_RETERROR)
return n;
out(_("%s subprocess returned error exit status %d"), desc, n);
} else if (WIFSIGNALED(status)) {
n = WTERMSIG(status);
if (!n)
return 0;
if ((flags & SUBPROC_NOPIPE) && n == SIGPIPE)
return 0;
if (flags & SUBPROC_RETSIGNO)
return n;
if (n == SIGINT)
out(_("%s subprocess was interrupted"), desc);
else
out(_("%s subprocess was killed by signal (%s)%s"),
desc, strsignal(n),
WCOREDUMP(status) ? _(", core dumped") : "");
} else {
if (flags & SUBPROC_RETERROR)
return -1;
out(_("%s subprocess failed with wait status code %d"), desc,
status);
}
return -1;
}
static int
subproc_wait(pid_t pid, const char *desc)
{
pid_t dead_pid;
int status;
while ((dead_pid = waitpid(pid, &status, 0)) == -1 && errno == EINTR) ;
if (dead_pid != pid) {
onerr_abort++;
ohshite(_("wait for %s subprocess failed"), desc);
}
return status;
}
int
subproc_reap(pid_t pid, const char *desc, enum subproc_flags flags)
{
int status, rc;
status = subproc_wait(pid, desc);
if (flags & SUBPROC_NOCHECK)
rc = status;
else
rc = subproc_check(status, desc, flags);
return rc;
}
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