| 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 | |
|---|
