--- a/daemon.c
+++ b/daemon.c
@@ -16,6 +16,7 @@
 
 #define      MAXLEN 80
 #define    TIME_OUT 60
+
 #define  INPUT_FILE "/proc/meminfo"
 #define OUTPUT_FILE "/tmp/meminfo.log"
 #define   LOCK_FILE "/tmp/.daemon.lock"
@@ -48,6 +49,11 @@
     struct stat st;
     int fd;
 
+    if (stat (INPUT_FILE, &st) != 0) {
+        perror (INPUT_FILE);
+        exit (EXIT_FAILURE);
+    }
+
     if (argc == 2) {
         if (!strcmp (argv[1], "-h")) {
             printf ("Usage: %s [-f|-h]\n", argv[0]);
@@ -63,7 +69,10 @@
     }
 
     if (stat (LOCK_FILE, &st) < 0) {
-        fd = open (LOCK_FILE, O_WRONLY | O_CREAT, 0);
+        if ((fd = open (LOCK_FILE, O_WRONLY | O_CREAT, 0)) < 0) {
+            perror (LOCK_FILE);
+            exit (EXIT_FAILURE);
+        }
         close (fd);
     } else {
         fprintf (stderr, "%s is already running\n", argv[0]);