daemonize after gpsd connection is established; gps fix might take time

This commit is contained in:
Harald Welte 2013-04-10 14:06:25 +02:00
parent 9964203e03
commit 4ad6c932c9
1 changed files with 52 additions and 0 deletions

View File

@ -34,7 +34,10 @@
#include <unistd.h>
#include <string.h>
#include <syslog.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <gps.h>
@ -73,6 +76,53 @@ static void callback(struct gps_data_t *gpsdata)
}
}
static int osmo_daemonize(void)
{
int rc;
pid_t pid, sid;
/* Check if parent PID == init, in which case we are already a daemon */
if (getppid() == 1)
return -EEXIST;
/* Fork from the parent process */
pid = fork();
if (pid < 0) {
/* some error happened */
return pid;
}
if (pid > 0) {
/* if we have received a positive PID, then we are the parent
* and can exit */
exit(0);
}
/* FIXME: do we really want this? */
umask(0);
/* Create a new session and set process group ID */
sid = setsid();
if (sid < 0)
return sid;
/* Change to the /tmp directory, which prevents the CWD from being locked
* and unable to remove it */
rc = chdir("/tmp");
if (rc < 0)
return rc;
/* Redirect stdio to /dev/null */
/* since C89/C99 says stderr is a macro, we can safely do this! */
#ifdef stderr
freopen("/dev/null", "r", stdin);
freopen("/dev/null", "w", stdout);
freopen("/dev/null", "w", stderr);
#endif
return 0;
}
int main(int argc, char **argv)
{
char *host = "localhost";
@ -98,6 +148,8 @@ int main(int argc, char **argv)
exit(EXIT_FAILURE);
}
osmo_daemonize();
gps_stream(&gpsdata, WATCH_ENABLE|WATCH_JSON, NULL);
gps_mainloop(&gpsdata, 5000000, callback);