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 } 35