diff --git a/programs/tests/t_abort.c b/programs/tests/t_abort.c
index adfc2c8..b29ea93 100644
--- a/programs/tests/t_abort.c
+++ b/programs/tests/t_abort.c
@@ -23,6 +23,8 @@ void sig_handler(int sig)
         printf("handler(%d) : Correct signal. ABRT (%d/3)\n", sig, counter);
         if (counter < 3)
             abort();
+        else
+            exit(0);
 
     } else {
         printf("handler(%d) : Wrong signal.\n", sig);
diff --git a/programs/tests/t_sigfpe.c b/programs/tests/t_sigfpe.c
index 6c11366..b67efd3 100644
--- a/programs/tests/t_sigfpe.c
+++ b/programs/tests/t_sigfpe.c
@@ -18,25 +18,13 @@ void sig_handler(int sig)
     if (sig == SIGFPE) {
         printf("handler(%d) : Correct signal. FPE\n", sig);
         printf("handler(%d) : Exiting\n", sig);
-        // exit(1);
+        exit(0);
     } else {
         printf("handler(%d) : Wrong signal.\n", sig);
     }
     printf("handler(%d) : Ending handler.\n", sig);
 }
 
-long int fact(int n)
-{
-    if (n == 0 || n == 1) {
-        return 1;
-    }
-    long int pro = 1;
-    while (n != 1) {
-        pro *= n--;
-    }
-    return pro;
-}
-
 int main(int argc, char *argv[])
 {
     sigaction_t action;
diff --git a/programs/tests/t_siginfo.c b/programs/tests/t_siginfo.c
index 80359da..8ad52d7 100644
--- a/programs/tests/t_siginfo.c
+++ b/programs/tests/t_siginfo.c
@@ -19,7 +19,7 @@ void sig_handler_info(int sig, siginfo_t *siginfo)
         printf("handler(%d, %p) : Correct signal.\n", sig, siginfo);
         printf("handler(%d, %p) : Code : %d\n", sig, siginfo, siginfo->si_code);
         printf("handler(%d, %p) : Exiting\n", sig, siginfo);
-        exit(1);
+        exit(0);
     } else {
         printf("handler(%d, %p) : Wrong signal.\n", sig, siginfo);
     }
diff --git a/programs/tests/t_sigusr.c b/programs/tests/t_sigusr.c
index 274b346..768e9cc 100644
--- a/programs/tests/t_sigusr.c
+++ b/programs/tests/t_sigusr.c
@@ -22,7 +22,7 @@ void sig_handler(int sig)
         counter += 1;
 
         if (counter == 2)
-            exit(1);
+            exit(0);
 
     } else {
         printf("handler(%d) : Wrong signal.\n", sig);
@@ -51,5 +51,5 @@ int main(int argc, char *argv[])
     kill(getpid(), SIGUSR2);
 
     while(1) { };
-    return 0;
+    return 1;
 }