Merge remote-tracking branch 'origin/branch-netatalk-3-1'

[netatalk.git] / libatalk / util / server_lock.c

diff --git a/libatalk/util/server_lock.c b/libatalk/util/server_lock.c
index a08e30a2f199c5954839bfd82b36282792bdee22..6ae817e5547c701891ee7e2d6dcfd554283b9870 100644 (file)
--- a/libatalk/util/server_lock.c
+++ b/libatalk/util/server_lock.c
@@ -37,7 +37,8 @@ pid_t server_lock(char *program, char *pidfile, int debug)
   FILE *pf;
   pid_t pid;
   int mask;
-  
+
+  if ( !debug ) {
   mask = umask(022);
   /* check for pid. this can get fooled by stale pid's. */
   if ((pf = fopen(pidfile, "r"))) {
@@ -60,7 +61,7 @@ pid_t server_lock(char *program, char *pidfile, int debug)
   /*
    * Disassociate from controlling tty.
    */
-  if ( !debug ) {
+
     int                i;
 
     getitimer(ITIMER_PROF, &itimer);
@@ -90,10 +91,57 @@ pid_t server_lock(char *program, char *pidfile, int debug)
       fclose(pf);
       return pid;
     }
-  } 
 
   fprintf(pf, "%d\n", getpid());
   fclose(pf);
+  } 
+
   return 0;
 }
 
+/*!
+ * Check lockfile
+ */
+int check_lockfile(const char *program, const char *pidfile)
+{
+    char buf[10];
+    FILE *pf;
+    pid_t pid;
+
+    /* check for pid. this can get fooled by stale pid's. */
+    if ((pf = fopen(pidfile, "r"))) {
+        if (fgets(buf, sizeof(buf), pf) && !kill(pid = atol(buf), 0)) {
+            fprintf(stderr, "%s is already running (pid = %d), or the lock file is stale.\n",
+                    program, pid);      
+            fclose(pf);
+            return -1;
+        }
+        fclose(pf);
+    }
+    return 0;
+}
+
+/*!
+ * Check and create lockfile
+ */
+int create_lockfile(const char *program, const char *pidfile)
+{
+    FILE *pf;
+    int mask;
+  
+    if (check_lockfile(program, pidfile) != 0)
+        return -1;
+
+    /* Write PID to pidfile */
+    mask = umask(022);
+    if ((pf = fopen(pidfile, "w")) == NULL) {
+        fprintf(stderr, "%s: can't open lock file, \"%s\"\n", program,
+                pidfile);
+        return -1;
+    }
+    umask(mask);
+    fprintf(pf, "%d\n", getpid());
+    fclose(pf);
+
+    return 0;
+}