mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
/***
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This file is part of PulseAudio.
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Copyright 2007 Lennart Poettering
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <errno.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#ifdef HAVE_SYS_PRCTL_H
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#include <sys/prctl.h>
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#endif
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#ifdef HAVE_SYS_RESOURCE_H
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#include <sys/resource.h>
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#endif
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#include <pulsecore/core-util.h>
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#include <pulsecore/core-error.h>
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#include "start-child.h"
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int pa_start_child_for_read(const char *name, const char *argv1, pid_t *pid) {
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pid_t child;
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int pipe_fds[2] = { -1, -1 };
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if (pipe(pipe_fds) < 0) {
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pa_log("pipe() failed: %s", pa_cstrerror(errno));
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goto fail;
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}
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if ((child = fork()) == (pid_t) -1) {
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pa_log("fork() failed: %s", pa_cstrerror(errno));
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goto fail;
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} else if (child != 0) {
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/* Parent */
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pa_assert_se(pa_close(pipe_fds[1]) == 0);
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if (pid)
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*pid = child;
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return pipe_fds[0];
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} else {
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/* child */
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pa_reset_personality();
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pa_assert_se(pa_close(pipe_fds[0]) == 0);
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pa_assert_se(dup2(pipe_fds[1], STDOUT_FILENO) == STDOUT_FILENO);
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if (pipe_fds[1] != STDOUT_FILENO)
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pa_assert_se(pa_close(pipe_fds[1]) == 0);
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pa_close(STDIN_FILENO);
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pa_assert_se(open("/dev/null", O_RDONLY) == STDIN_FILENO);
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pa_close(STDERR_FILENO);
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pa_assert_se(open("/dev/null", O_WRONLY) == STDERR_FILENO);
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pa_close_all(-1);
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pa_reset_sigs(-1);
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pa_unblock_sigs(-1);
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pa_reset_priority();
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#ifdef PR_SET_PDEATHSIG
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/* On Linux we can use PR_SET_PDEATHSIG to have the helper
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process killed when the daemon dies abnormally. On non-Linux
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machines the client will die as soon as it writes data to
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stdout again (SIGPIPE) */
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prctl(PR_SET_PDEATHSIG, SIGTERM, 0, 0, 0);
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#endif
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execl(name, name, argv1, NULL);
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_exit(1);
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}
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fail:
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pa_close_pipe(pipe_fds);
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return -1;
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}
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