X-Git-Url: https://gapil.gnulinux.it/gitweb/?p=gapil.git;a=blobdiff_plain;f=sources%2Fsleep1.c;h=2225c96eac15729b79cabedbaad09be25d5e4f25;hp=158e5058927d0f38fa37fc3ff4c6f982ec8f8956;hb=da8455a295d5e2e237711cd930b7052f1b30ea38;hpb=2fa7645d9be0ffb058c335de3f474892fe55af31

diff --git a/sources/sleep1.c b/sources/sleep1.c
index 158e505..2225c96 100644
--- a/sources/sleep1.c
+++ b/sources/sleep1.c
@@ -28,26 +28,10 @@
 /* 
  * Include needed headers
  */
+#define _GNU_SOURCE
 #include <unistd.h>      /* unix standard library */
+#include <signal.h>      /* signal standard library */
 
-unsigned int sleep(unsigned int seconds)
-{
-/* 
- * Variables definition  
- */
-    signandler_t prev_handler;
-
-    if ((prev_handler = signal(SIGALRM, alarm_hand)) == SIG_ERR) {
-	printf("Cannot set handler for alarm\n");
-	exit(1);
-    }
-    alarm(second);
-    pause(); 
-    /* restore previous signal handler */
-    signal(SIGALRM, prev_handler);
-    /* remove alarm, return remaining time */
-    return alarm(0);
-}
 void alarm_hand(int sig) {
     /* check if the signal is the right one */
     if (sig != SIGALRM) { /* if not exit with error */
@@ -57,3 +41,19 @@ void alarm_hand(int sig) {
 	return;
     }
 }
+unsigned int sleep(unsigned int seconds)
+{
+    sighandler_t prev_handler;
+    /* install and check new handler */
+    if ((prev_handler = signal(SIGALRM, alarm_hand)) == SIG_ERR) {
+	printf("Cannot set handler for alarm\n"); 
+	exit(-1);
+    }
+    /* set alarm and go to sleep */
+    alarm(seconds); 
+    pause(); 
+    /* restore previous signal handler */
+    signal(SIGALRM, prev_handler);
+    /* return remaining time */
+    return alarm(0);
+}