New and improved!

test/signal/sigchld.c

@@ -9,20 +9,30 @@
 
 void test_handler(int signo) 
 {
-    printf("caught signo: %d\n", signo);
-    fflush(stdout);
+    write(1, "caught SIGCHLD\n", 15);
+    return;
 }
 
 
 int main(void) 
 {
     pid_t mypid;
-    int count = 0;
     struct sigaction siga;
     static sigset_t sigset;
 
-    mypid = getpid();
+    /* Set up sighandling */
+    sigfillset(&sigset);
+    siga.sa_handler = test_handler;
+    siga.sa_mask = sigset;
+    siga.sa_flags = 0;
+    if (sigaction(SIGCHLD, &siga, (struct sigaction *)NULL) != 0) {
+	fprintf(stderr, "sigaction choked: %s!", strerror(errno));
+	exit(EXIT_FAILURE);
+    }
+    
 
+    /* Setup a child process to exercise the sig handling for us */
+    mypid = getpid();
     if (fork() == 0) {
 	int i;
 
@@ -30,32 +40,20 @@ int main(void)
 	    sleep(2);
 	    kill(mypid, SIGCHLD);
 	}
-	exit(EXIT_SUCCESS);
+	_exit(EXIT_SUCCESS);
     }
 
-    sigfillset(&sigset);
-
-    siga.sa_handler = test_handler;
-    siga.sa_mask = sigset;
-    siga.sa_flags = 0;
-
-    if (sigaction(SIGCHLD, &siga, (struct sigaction *)NULL) != 0) {
-	fprintf(stderr, "sigaction choked: %s!", strerror(errno));
-	exit(EXIT_FAILURE);
-    }
-    printf("waiting for a SIGCHLD\n");
-    fflush(stdout);
 
+    /* Wait for signals */
+    write(1, "waiting for a SIGCHLD\n",22);
     for(;;) {
 	sleep(10);
 	if (waitpid(-1, NULL, WNOHANG | WUNTRACED) > 0)
 	    break;
-	printf("after sleep %d\n", ++count);
-	fflush(stdout);
+	write(1, "after sleep\n", 12); 
     }
 
-    printf("after loop\n");
-
+    printf("Bye-bye!  All done!\n");
     return 0;
 }