Signal for IPC

Signals/ctrl_c.c

@@ -0,0 +1,51 @@
+/*
+	Consider a program below, 
+	There is some special thing attached to SIGABRT signal.
+
+	You can see, in below code, line no 23 registers a handler routine with signal SIGABRT.
+	when abort() is called, it delivers the signal SIGABRT to this process, and  abort_signal_handler() will be invoked.
+	Note that, it is mandatory to terminate the process by calling exit(0) from abort_signal_handler(). Handler routine
+	for SIGABRT signal must not return to caller. It it returns, Kernel will kill the process instead. You can perform experiment
+	by removing the line 16 in below code, and you will notice that process is terminated after execution of abort_signal_handler().
+	Hence, Process either commit suicide or it will be killed by the OS. SIGABRT signal cannot be blocked(= ignore) by the process.
+
+*/
+
+
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static void
+ctrlC_signal_handler(int sig) {
+
+	printf("Ctrl-C pressed\n");
+	printf("Bye Bye\n");
+	exit(0);
+
+}
+
+static void
+abort_signal_handler(int sig) {
+
+	printf("process is aborted\n");
+	printf("Bye Bye\n");
+	exit(0);
+
+}
+
+int
+main(int argc, char* argv[]) {
+
+	signal(SIGINT, ctrlC_signal_handler);
+	signal(SIGABRT, abort_signal_handler);
+
+	char ch;
+	printf("About process (y/n) ?\n");
+	scanf("%c", &ch);
+	if (ch == 'y')
+		abort();
+
+
+	return 0;
+}