Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / filesystems / dnotify_test.c

diff --git a/kernel/Documentation/filesystems/dnotify_test.c b/kernel/Documentation/filesystems/dnotify_test.c
new file mode 100644 (file)
index 0000000..8b37b4a
--- /dev/null
+++ b/kernel/Documentation/filesystems/dnotify_test.c
@@ -0,0 +1,34 @@
+#define _GNU_SOURCE    /* needed to get the defines */
+#include <fcntl.h>     /* in glibc 2.2 this has the needed
+                                  values defined */
+#include <signal.h>
+#include <stdio.h>
+#include <unistd.h>
+
+static volatile int event_fd;
+
+static void handler(int sig, siginfo_t *si, void *data)
+{
+       event_fd = si->si_fd;
+}
+
+int main(void)
+{
+       struct sigaction act;
+       int fd;
+
+       act.sa_sigaction = handler;
+       sigemptyset(&act.sa_mask);
+       act.sa_flags = SA_SIGINFO;
+       sigaction(SIGRTMIN + 1, &act, NULL);
+
+       fd = open(".", O_RDONLY);
+       fcntl(fd, F_SETSIG, SIGRTMIN + 1);
+       fcntl(fd, F_NOTIFY, DN_MODIFY|DN_CREATE|DN_MULTISHOT);
+       /* we will now be notified if any of the files
+          in "." is modified or new files are created */
+       while (1) {
+               pause();
+               printf("Got event on fd=%d\n", event_fd);
+       }
+}