SIGNAL

System2/catch_signal/main.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <signal.h>
+#include <unistd.h>
+
+void sig_usr(int signo)
+{
+    if (signo == SIGUSR1)
+        printf("received SIGUSR1\n");
+    else if (signo == SIGUSR2)
+        printf("received SIGUSR2\n");
+    else
+        printf("received signal %d\n", signo);
+}
+
+int main(void)
+{
+    if (signal(SIGUSR1, sig_usr) == SIG_ERR)
+        printf("can't catch SIGUSR1\n");
+    if (signal(SIGUSR2, sig_usr) == SIG_ERR)
+        printf("can't catch SIGUSR2\n");
+    for (;;)
+        pause();
+}