https://toorun.dev/tags/signals/Recent content in signals on toorun.devHugo -- gohugo.ioen-usSat, 25 Jul 2026 11:00:00 +0000https://toorun.dev/posts/linux-signals-ctrl-c-handler-sigint-sigalrm-sigusr1/Sat, 25 Jul 2026 11:00:00 +0000https://toorun.dev/posts/linux-signals-ctrl-c-handler-sigint-sigalrm-sigusr1/Linux Signals: Custom Ctrl+C Handler (Short Practical Guide) In Linux/embedded Linux, signals are useful for lightweight control events. Typical use: stop, reload, notify, timeout. This example shows: Custom Ctrl+C (SIGINT) behavior Sending SIGUSR1 to another process Using SIGALRM as a timeout Full short example #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #define W(msg) write(STDOUT_FILENO, msg, sizeof(msg) - 1) static volatile sig_atomic_t running = 1; static volatile sig_atomic_t got_usr1 = 0; static volatile sig_atomic_t child_pid = -1; static void on_sigint(int sig) { (void)sig; W("\nSIGINT: Ctrl+C caught.