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authorLennart Poettering <lennart@poettering.net>2006-06-19 21:53:48 +0000
committerLennart Poettering <lennart@poettering.net>2006-06-19 21:53:48 +0000
commitf44ba092651aa75055e109e04b4164ea92ae7fdc (patch)
tree5dfe076191b32946e78edf64d584d0a65f320013 /src/pulsecore/pid.c
parentdd21f11deda64e65a6f75817496534c2c9dda1a8 (diff)
big s/polyp/pulse/g
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1033 fefdeb5f-60dc-0310-8127-8f9354f1896f
Diffstat (limited to 'src/pulsecore/pid.c')
-rw-r--r--src/pulsecore/pid.c304
1 files changed, 304 insertions, 0 deletions
diff --git a/src/pulsecore/pid.c b/src/pulsecore/pid.c
new file mode 100644
index 00000000..b8972866
--- /dev/null
+++ b/src/pulsecore/pid.c
@@ -0,0 +1,304 @@
+/* $Id$ */
+
+/***
+ This file is part of PulseAudio.
+
+ 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 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
+ 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 <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <stdio.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <signal.h>
+
+#ifdef HAVE_WINDOWS_H
+#include <windows.h>
+#endif
+
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/core-error.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/log.h>
+
+#include "pid.h"
+
+/* Read the PID data from the file descriptor fd, and return it. If no
+ * pid could be read, return 0, on failure (pid_t) -1 */
+static pid_t read_pid(const char *fn, int fd) {
+ ssize_t r;
+ char t[20], *e;
+ uint32_t pid;
+
+ assert(fn && fd >= 0);
+
+ if ((r = pa_loop_read(fd, t, sizeof(t)-1)) < 0) {
+ pa_log_warn(__FILE__": WARNING: failed to read PID file '%s': %s",
+ fn, pa_cstrerror(errno));
+ return (pid_t) -1;
+ }
+
+ if (r == 0)
+ return (pid_t) 0;
+
+ t[r] = 0;
+ if ((e = strchr(t, '\n')))
+ *e = 0;
+
+ if (pa_atou(t, &pid) < 0) {
+ pa_log(__FILE__": WARNING: failed to parse PID file '%s'", fn);
+ return (pid_t) -1;
+ }
+
+ return (pid_t) pid;
+}
+
+static int open_pid_file(const char *fn, int mode) {
+ int fd = -1;
+ int lock = -1;
+
+ for (;;) {
+ struct stat st;
+
+ pa_make_secure_parent_dir(fn);
+
+ if ((fd = open(fn, mode, S_IRUSR|S_IWUSR)) < 0) {
+ if (mode != O_RDONLY || errno != ENOENT)
+ pa_log_warn(__FILE__": WARNING: failed to open PID file '%s': %s",
+ fn, pa_cstrerror(errno));
+ goto fail;
+ }
+
+ /* Try to lock the file. If that fails, go without */
+ if (pa_lock_fd(fd, 1) < 0)
+ goto fail;
+
+ if (fstat(fd, &st) < 0) {
+ pa_log_warn(__FILE__": WARNING: failed to fstat() PID file '%s': %s",
+ fn, pa_cstrerror(errno));
+ goto fail;
+ }
+
+ /* Does the file still exist in the file system? When ye, w're done, otherwise restart */
+ if (st.st_nlink >= 1)
+ break;
+
+ if (pa_lock_fd(fd, 0) < 0)
+ goto fail;
+
+ if (close(fd) < 0) {
+ pa_log_warn(__FILE__": WARNING: failed to close file '%s': %s",
+ fn, pa_cstrerror(errno));
+ goto fail;
+ }
+
+ fd = -1;
+ }
+
+ return fd;
+
+fail:
+
+ if (fd < 0) {
+ if (lock >= 0)
+ pa_lock_fd(fd, 0);
+
+ close(fd);
+ }
+
+ return -1;
+}
+
+/* Create a new PID file for the current process. */
+int pa_pid_file_create(void) {
+ int fd = -1;
+ int ret = -1;
+ char fn[PATH_MAX];
+ char t[20];
+ pid_t pid;
+ size_t l;
+
+#ifdef OS_IS_WIN32
+ HANDLE process;
+#endif
+
+ pa_runtime_path("pid", fn, sizeof(fn));
+
+ if ((fd = open_pid_file(fn, O_CREAT|O_RDWR)) < 0)
+ goto fail;
+
+ if ((pid = read_pid(fn, fd)) == (pid_t) -1)
+ pa_log(__FILE__": corrupt PID file, overwriting.");
+ else if (pid > 0) {
+#ifdef OS_IS_WIN32
+ if ((process = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid)) != NULL) {
+ CloseHandle(process);
+#else
+ if (kill(pid, 0) >= 0 || errno != ESRCH) {
+#endif
+ pa_log(__FILE__": daemon already running.");
+ goto fail;
+ }
+
+ pa_log(__FILE__": stale PID file, overwriting.");
+ }
+
+ /* Overwrite the current PID file */
+ if (lseek(fd, 0, SEEK_SET) == (off_t) -1 || ftruncate(fd, 0) < 0) {
+ pa_log(__FILE__": failed to truncate PID file '%s': %s",
+ fn, pa_cstrerror(errno));
+ goto fail;
+ }
+
+ snprintf(t, sizeof(t), "%lu\n", (unsigned long) getpid());
+ l = strlen(t);
+
+ if (pa_loop_write(fd, t, l) != (ssize_t) l) {
+ pa_log(__FILE__": failed to write PID file.");
+ goto fail;
+ }
+
+ ret = 0;
+
+fail:
+ if (fd >= 0) {
+ pa_lock_fd(fd, 0);
+ close(fd);
+ }
+
+ return ret;
+}
+
+/* Remove the PID file, if it is ours */
+int pa_pid_file_remove(void) {
+ int fd = -1;
+ char fn[PATH_MAX];
+ int ret = -1;
+ pid_t pid;
+ char *p;
+
+ pa_runtime_path("pid", fn, sizeof(fn));
+
+ if ((fd = open_pid_file(fn, O_RDWR)) < 0) {
+ pa_log_warn(__FILE__": WARNING: failed to open PID file '%s': %s",
+ fn, pa_cstrerror(errno));
+ goto fail;
+ }
+
+ if ((pid = read_pid(fn, fd)) == (pid_t) -1)
+ goto fail;
+
+ if (pid != getpid()) {
+ pa_log(__FILE__": WARNING: PID file '%s' not mine!", fn);
+ goto fail;
+ }
+
+ if (ftruncate(fd, 0) < 0) {
+ pa_log_warn(__FILE__": WARNING: failed to truncate PID file '%s': %s",
+ fn, pa_cstrerror(errno));
+ goto fail;
+ }
+
+#ifdef OS_IS_WIN32
+ pa_lock_fd(fd, 0);
+ close(fd);
+ fd = -1;
+#endif
+
+ if (unlink(fn) < 0) {
+ pa_log_warn(__FILE__": WARNING: failed to remove PID file '%s': %s",
+ fn, pa_cstrerror(errno));
+ goto fail;
+ }
+
+ if ((p = pa_parent_dir(fn))) {
+ rmdir(p);
+ pa_xfree(p);
+ }
+
+ ret = 0;
+
+fail:
+
+ if (fd >= 0) {
+ pa_lock_fd(fd, 0);
+ close(fd);
+ }
+
+ return ret;
+}
+
+/* Check whether the daemon is currently running, i.e. if a PID file
+ * exists and the PID therein too. Returns 0 on succcess, -1
+ * otherwise. If pid is non-NULL and a running daemon was found,
+ * return its PID therein */
+int pa_pid_file_check_running(pid_t *pid) {
+ return pa_pid_file_kill(0, pid);
+}
+
+#ifndef OS_IS_WIN32
+
+/* Kill a current running daemon. Return non-zero on success, -1
+ * otherwise. If successful *pid contains the PID of the daemon
+ * process. */
+int pa_pid_file_kill(int sig, pid_t *pid) {
+ int fd = -1;
+ char fn[PATH_MAX];
+ int ret = -1;
+ pid_t _pid;
+
+ if (!pid)
+ pid = &_pid;
+
+ pa_runtime_path("pid", fn, sizeof(fn));
+
+ if ((fd = open_pid_file(fn, O_RDONLY)) < 0)
+ goto fail;
+
+ if ((*pid = read_pid(fn, fd)) == (pid_t) -1)
+ goto fail;
+
+ ret = kill(*pid, sig);
+
+fail:
+
+ if (fd >= 0) {
+ pa_lock_fd(fd, 0);
+ close(fd);
+ }
+
+ return ret;
+
+}
+
+#else /* OS_IS_WIN32 */
+
+int pa_pid_file_kill(int sig, pid_t *pid) {
+ return -1;
+}
+
+#endif