1
2#define _GNU_SOURCE
3#include <fcntl.h>
4
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
30
31 while (1) {
32 pause();
33 printf("Got event on fd=%d\n", event_fd);
34 }
35}
36