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git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@298 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2004-11-21 02:43:05 +00:00
parent 6985eda934
commit fa751e537d
12 changed files with 88 additions and 14 deletions
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15
polyp/pid.c
View file

@ -38,6 +38,8 @@
#include "util.h"
#include "log.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 = NULL;
@ -63,6 +65,7 @@ static pid_t read_pid(const char *fn, int fd) {
return (pid_t) pid;
}
/* Create a new PID file for the current process. */
int pa_pid_file_create(void) {
int fd = -1, lock = -1;
int ret = -1;
@ -77,19 +80,21 @@ int pa_pid_file_create(void) {
goto fail;
}
/* Try to lock the file. If that fails, go without */
lock = pa_lock_fd(fd, 1);
if ((pid = read_pid(fn, fd)) == (pid_t) -1)
pa_log(__FILE__": corrupt PID file, overwriting.\n");
else if (pid > 0) {
if (kill(pid, 0) >= 0 || errno != ESRCH) {
pa_log(__FILE__": valid PID file.\n");
pa_log(__FILE__": daemon already running.\n");
goto fail;
}
pa_log(__FILE__": stale PID file, overwriting.\n");
}
/* 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 fil: %s.\n", strerror(errno));
goto fail;
@ -116,6 +121,7 @@ fail:
return ret;
}
/* Remove the PID file, if it is ours */
int pa_pid_file_remove(void) {
int fd = -1, lock = -1;
char fn[PATH_MAX];
@ -162,10 +168,17 @@ fail:
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);
}
/* 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, lock = -1;
char fn[PATH_MAX];