implementing signal handling in C on macOS - advanced patterns with SIGINT
After trying multiple solutions online, I still can't figure this out. I'm currently working on a command-line application in C that needs to handle user interrupts (Ctrl+C) gracefully by capturing the SIGINT signal. However, I'm experiencing some unexpected behavior on macOS Big Sur (version 11.6). When I run my program and press Ctrl+C, instead of executing my signal handler, the program simply exits without any cleanup. Here's how I set up the signal handler: ```c #include <stdio.h> #include <stdlib.h> #include <signal.h> #include <unistd.h> void handle_sigint(int sig) { printf("Received SIGINT\n"); // Perform cleanup here exit(0); } int main() { signal(SIGINT, handle_sigint); while (1) { printf("Running...\n"); sleep(1); } return 0; } ``` I expect "Received SIGINT" to be printed when I press Ctrl+C, but instead, the program exits without executing the handler. I've tried using `sigaction` instead of `signal`, but the behavior continues: ```c struct sigaction sa; sa.sa_handler = handle_sigint; sa.sa_flags = 0; // or SA_RESTART sigaction(SIGINT, &sa, NULL); ``` No matter what I do, the signal is not caught. I've also checked other parts of the code to ensure that there are no threads or background processes interfering with the signal handling, but everything seems fine. Additionally, I’ve tried running the program with different terminal emulators (Terminal and iTerm2) to rule out emulator-specific issues, but the question is consistent. Is there something specific to macOS's handling of signals that could be causing this scenario? Any insights would be greatly appreciated! What's the best practice here?