// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE /* needed to get the defines */
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#include <fcntl.h> /* in glibc 2.2 this has the needed
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values defined */
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#include <signal.h>
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#include <stdio.h>
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#include <unistd.h>
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static volatile int event_fd;
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static void handler(int sig, siginfo_t *si, void *data)
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{
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event_fd = si->si_fd;
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}
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int main(void)
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{
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struct sigaction act;
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int fd;
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act.sa_sigaction = handler;
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sigemptyset(&act.sa_mask);
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act.sa_flags = SA_SIGINFO;
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sigaction(SIGRTMIN + 1, &act, NULL);
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fd = open(".", O_RDONLY);
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fcntl(fd, F_SETSIG, SIGRTMIN + 1);
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fcntl(fd, F_NOTIFY, DN_MODIFY|DN_CREATE|DN_MULTISHOT);
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/* we will now be notified if any of the files
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in "." is modified or new files are created */
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while (1) {
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pause();
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printf("Got event on fd=%d\n", event_fd);
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}
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}
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