Post #4080669

It makes a difference if you compile this with -std=c17 or -std=gnu17. I don’t know why yet. If you compile with -std=c17 and press ctrl+c, waitpid will return -1, if you compile with -std=gnu17 and press ctrl+c, waitpid will return pid. Tested with recent GCC and Clang on x86_64-unknown-linux-gnu. #include <signal.h> #include <stdio.h> #include <sys/wait.h> #include <unistd.h> static void signal_handler(int sig) { printf("caught signal %d\n", sig); } int main() { signal(SIGINT, signal_handler); pid_t pid = fork(); if (pid < 0) { return -1; } else if (pid == 0) { execlp("cat", "cat", NULL); return -1; } printf("pid == %d. press ctrl+c ...\n", pid); int status; pid_t ret = waitpid(pid, &status, 0); if (ret < 0) { perror("waitpid"); return -1; } printf("waited; ret == %d, status == %d\n", ret, status); }