man/inotify-watch-tmp.c

   1 /* SPDX-License-Identifier: MIT-0 */
   2
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <sys/inotify.h>
   6
   7 #include <systemd/sd-event.h>
   8
   9 #define _cleanup_(f) __attribute__((cleanup(f)))
  10
  11 static int inotify_handler(sd_event_source *source,
  12                            const struct inotify_event *event,
  13                            void *userdata) {
  14
  15   const char *desc = NULL;
  16
  17   sd_event_source_get_description(source, &desc);
  18
  19   if (event->mask & IN_Q_OVERFLOW)
  20     printf("inotify-handler <%s>: overflow\n", desc);
  21   else if (event->mask & IN_CREATE)
  22     printf("inotify-handler <%s>: create on %s\n", desc, event->name);
  23   else if (event->mask & IN_DELETE)
  24     printf("inotify-handler <%s>: delete on %s\n", desc, event->name);
  25   else if (event->mask & IN_MOVED_TO)
  26     printf("inotify-handler <%s>: moved-to on %s\n", desc, event->name);
  27
  28   /* Terminate the program if an "exit" file appears */
  29   if ((event->mask & (IN_CREATE|IN_MOVED_TO)) &&
  30       strcmp(event->name, "exit") == 0)
  31     sd_event_exit(sd_event_source_get_event(source), 0);
  32
  33   return 1;
  34 }
  35
  36 int main(int argc, char **argv) {
  37   _cleanup_(sd_event_unrefp) sd_event *event = NULL;
  38   _cleanup_(sd_event_source_unrefp) sd_event_source *source1 = NULL, *source2 = NULL;
  39
  40   const char *path1 = argc > 1 ? argv[1] : "/tmp";
  41   const char *path2 = argc > 2 ? argv[2] : NULL;
  42
  43   /* Note: failure handling is omitted for brevity */
  44
  45   sd_event_default(&event);
  46
  47   sd_event_add_inotify(event, &source1, path1,
  48                        IN_CREATE | IN_DELETE | IN_MODIFY | IN_MOVED_TO,
  49                        inotify_handler, NULL);
  50   if (path2)
  51     sd_event_add_inotify(event, &source2, path2,
  52                          IN_CREATE | IN_DELETE | IN_MODIFY | IN_MOVED_TO,
  53                          inotify_handler, NULL);
  54
  55   sd_event_loop(event);
  56
  57   return 0;
  58 }