Add hook to refresh config on SIGHUP.

[apps/pfixtools.git] / common / common.c

diff --git a/common/common.c b/common/common.c
index 3688c9d..758e869 100644 (file)
--- a/common/common.c
+++ b/common/common.c
@@ -229,11 +229,20 @@ int drop_privileges(const char *user, const char *group)
 
 int pidfile_open(const char *name)
 {
+               struct flock lock;
+               p_clear(&lock, 1);
+               lock.l_type = F_WRLCK;
     if (name) {
         pidfile = fopen(name, "w");
         if (!pidfile)
             return -1;
-        fprintf(pidfile, "%d\n", getpid());
+                               if (fcntl(fileno(pidfile), F_SETLK, &lock) == -1) {
+                                               syslog(LOG_ERR, "program already started");
+                                               fclose(pidfile);
+                                               pidfile = NULL;
+                                               return -1;
+                               }
+                               fprintf(pidfile, "%d\n", getpid());
         return fflush(pidfile);
     }
     return 0;
@@ -252,10 +261,14 @@ int pidfile_refresh(void)
 
 static void pidfile_close(void)
 {
+               struct flock lock;
+               p_clear(&lock, 1);
+               lock.l_type = F_UNLCK;
     if (pidfile) {
         rewind(pidfile);
         ftruncate(fileno(pidfile), 0);
-        fclose(pidfile);
+        fcntl(fileno(pidfile), F_SETLK, &lock);
+                               fclose(pidfile);
         pidfile = NULL;
     }
 }