Merge commit 'e2a5e6750a362e0fd8c89f3d1d40a623ba6d1fd6'

labs/03_shlab/mystop.c

@@ -0,0 +1,36 @@
+/* 
+ * mystop.c - Another handy routine for testing your tiny shell
+ * 
+ * usage: mystop <n>
+ * Sleeps for <n> seconds and sends SIGTSTP to itself.
+ *
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+
+int main(int argc, char **argv) 
+{
+	int i, secs;
+	pid_t pid; 
+
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s <n>\n", argv[0]);
+		exit(0);
+	}
+	secs = atoi(argv[1]);
+
+	for (i=0; i < secs; i++)
+		sleep(1);
+
+	pid = getpid(); 
+
+	if (kill(-pid, SIGTSTP) < 0)
+		fprintf(stderr, "kill (tstp) error");
+
+	exit(0);
+
+}