Signals exampe, sigaction included

signals/Makefile

@@ -0,0 +1,24 @@
+CC ?= gcc
+CFLAGS ?= -Wall -O2
+
+# This is not how makefiles should be written.
+# Pretend you did not see this
+
+all: main.elf main_sigaction.elf
+
+TARGET = main.elf
+SRC = main.c
+
+TARGET2 = main_sigaction.elf
+SRC2 = main_sigaction.c
+
+$(TARGET): $(SRC)
+	@echo CC $@
+	@$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+$(TARGET2): $(SRC2)
+	@echo CC $@
+	@$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+clean:
+	rm -f *.elf

signals/main.c

@@ -0,0 +1,17 @@
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+void handler(int sig) {
+    printf("Caught signal %d\n", sig);
+    exit(1);
+}
+
+int main() {
+    signal(SIGINT, handler); // Handle Ctrl+C
+    while (1) {
+        printf("Running...\n");
+        sleep(1);
+    }
+}

signals/main_sigaction.c

@@ -0,0 +1,23 @@
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+void handler(int sig) {
+    write(1, "Caught SIGINT\n", 14); // Async-signal-safe output
+    exit(1);
+}
+
+int main() {
+    struct sigaction sa;
+    sa.sa_handler = handler;
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+
+    sigaction(SIGINT, &sa, NULL);
+
+    while (1) {
+        printf("Running...\n");
+        sleep(1);
+    }
+}