Documentation/filesystems/dnotify_test.c

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