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/***
This file is part of PulseAudio.
Copyright 2007 Lennart Poettering
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
PulseAudio 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#include <pulsecore/core-util.h>
#include <pulsecore/core-error.h>
#include "start-child.h"
int pa_start_child_for_read(const char *name, const char *argv1, pid_t *pid) {
pid_t child;
int pipe_fds[2] = { -1, -1 };
if (pipe(pipe_fds) < 0) {
pa_log("pipe() failed: %s", pa_cstrerror(errno));
goto fail;
}
if ((child = fork()) == (pid_t) -1) {
pa_log("fork() failed: %s", pa_cstrerror(errno));
goto fail;
} else if (child != 0) {
/* Parent */
pa_assert_se(pa_close(pipe_fds[1]) == 0);
if (pid)
*pid = child;
return pipe_fds[0];
} else {
#ifdef __linux__
DIR* d;
#endif
int max_fd, i;
/* child */
pa_reset_priority();
pa_assert_se(pa_close(pipe_fds[0]) == 0);
pa_assert_se(dup2(pipe_fds[1], 1) == 1);
if (pipe_fds[1] != 1)
pa_assert_se(pa_close(pipe_fds[1]) == 0);
pa_close(0);
pa_assert_se(open("/dev/null", O_RDONLY) == 0);
pa_close(2);
pa_assert_se(open("/dev/null", O_WRONLY) == 2);
#ifdef __linux__
if ((d = opendir("/proc/self/fd/"))) {
struct dirent *de;
while ((de = readdir(d))) {
char *e = NULL;
int fd;
if (de->d_name[0] == '.')
continue;
errno = 0;
fd = strtol(de->d_name, &e, 10);
pa_assert(errno == 0 && e && *e == 0);
if (fd >= 3 && dirfd(d) != fd)
pa_close(fd);
}
closedir(d);
} else {
#endif
max_fd = 1024;
#ifdef HAVE_SYS_RESOURCE_H
{
struct rlimit r;
if (getrlimit(RLIMIT_NOFILE, &r) == 0)
max_fd = r.rlim_max;
}
#endif
for (i = 3; i < max_fd; i++)
pa_close(i);
#ifdef __linux__
}
#endif
#ifdef PR_SET_PDEATHSIG
/* On Linux we can use PR_SET_PDEATHSIG to have the helper
process killed when the daemon dies abnormally. On non-Linux
machines the client will die as soon as it writes data to
stdout again (SIGPIPE) */
prctl(PR_SET_PDEATHSIG, SIGTERM, 0, 0, 0);
#endif
#ifdef SIGPIPE
/* Make sure that SIGPIPE kills the child process */
signal(SIGPIPE, SIG_DFL);
#endif
#ifdef SIGTERM
/* Make sure that SIGTERM kills the child process */
signal(SIGTERM, SIG_DFL);
#endif
execl(name, name, argv1, NULL);
_exit(1);
}
fail:
pa_close_pipe(pipe_fds);
return -1;
}
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