36 lines · c
1// SPDX-License-Identifier: GPL-2.02#define _GNU_SOURCE /* needed to get the defines */3#include <fcntl.h> /* in glibc 2.2 this has the needed4 values defined */5#include <signal.h>6#include <stdio.h>7#include <unistd.h>8 9static volatile int event_fd;10 11static void handler(int sig, siginfo_t *si, void *data)12{13 event_fd = si->si_fd;14}15 16int main(void)17{18 struct sigaction act;19 int fd;20 21 act.sa_sigaction = handler;22 sigemptyset(&act.sa_mask);23 act.sa_flags = SA_SIGINFO;24 sigaction(SIGRTMIN + 1, &act, NULL);25 26 fd = open(".", O_RDONLY);27 fcntl(fd, F_SETSIG, SIGRTMIN + 1);28 fcntl(fd, F_NOTIFY, DN_MODIFY|DN_CREATE|DN_MULTISHOT);29 /* we will now be notified if any of the files30 in "." is modified or new files are created */31 while (1) {32 pause();33 printf("Got event on fd=%d\n", event_fd);34 }35}36