1 files changed, 113 insertions, 0 deletions
diff --git a/src/pulsecore/start-child.c b/src/pulsecore/start-child.c
new file mode 100644
index 0000000..7f0719c
--- /dev/null
+++ b/src/pulsecore/start-child.c
@@ -0,0 +1,113 @@
+/***
+  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, see <http://www.gnu.org/licenses/>.
+***/
+
+#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 <pulsecore/pipe.h>
+
+#include "start-child.h"
+
+int pa_start_child_for_read(const char *name, const char *argv1, pid_t *pid) {
+#ifdef HAVE_FORK
+    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 {
+        /* child */
+
+        pa_reset_personality();
+
+        pa_assert_se(pa_close(pipe_fds[0]) == 0);
+        pa_assert_se(dup2(pipe_fds[1], STDOUT_FILENO) == STDOUT_FILENO);
+
+        if (pipe_fds[1] != STDOUT_FILENO)
+            pa_assert_se(pa_close(pipe_fds[1]) == 0);
+
+        pa_close(STDIN_FILENO);
+        pa_assert_se(open("/dev/null", O_RDONLY) == STDIN_FILENO);
+
+        pa_close(STDERR_FILENO);
+        pa_assert_se(open("/dev/null", O_WRONLY) == STDERR_FILENO);
+
+        pa_close_all(-1);
+        pa_reset_sigs(-1);
+        pa_unblock_sigs(-1);
+        pa_reset_priority();
+        pa_unset_env_recorded();
+
+        /* Make sure our children are not influenced by the
+         * LD_BIND_NOW we set for ourselves. */
+        pa_unset_env("LD_BIND_NOW");
+
+#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
+
+        execl(name, name, argv1, NULL);
+        _exit(1);
+    }
+
+fail:
+    pa_close_pipe(pipe_fds);
+#endif /* HAVE_FORK */
+
+    return -1;
+}