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Linux/tools/testing/selftests/filesystems/dnotify_test.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #define _GNU_SOURCE     /* needed to get the defines */
  3 #include <fcntl.h>      /* in glibc 2.2 this has the needed
  4                                    values defined */
  5 #include <signal.h>
  6 #include <stdio.h>
  7 #include <unistd.h>
  8 
  9 static volatile int event_fd;
 10 
 11 static void handler(int sig, siginfo_t *si, void *data)
 12 {
 13         event_fd = si->si_fd;
 14 }
 15 
 16 int 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 files
 30            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 

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