inotify监控Linux文件系统的必备利器

　　清单 2. inotify-test.c 的简单主程序

　　1./* Signal handler that simply resets a flag to cause termination */

　　2.void signal_handler (int signum)

　　3.{

　　4.keep_running = 0;

　　5.}

　　6.int main (int argc, char **argv)

　　7.{

　　8./* This is the file descriptor for the inotify watch */

　　9.int inotify_fd;

　　10.keep_running = 1;

　　11./* Set a ctrl-c signal handler */

　　12.if (signal (SIGINT, signal_handler) == SIG_IGN)

　　13.{

　　14./* Reset to SIG_IGN (ignore) if that was the prior state */

　　15.signal (SIGINT, SIG_IGN);

　　16.}

　　17./* First we open the inotify dev entry */

　　18.inotify_fd = open_inotify_fd ();

　　19.if (inotify_fd > 0)

　　20.{

　　21./* We will need a place to enqueue inotify events,

　　22.this is needed because if you do not read events

　　23.fast enough, you will miss them. This queue is

　　24.probably too small if you are monitoring something

　　25.like a directory with a lot of files and the directory

　　26.is deleted.

　　27.*/

　　28.queue_t q;

　　29.q = queue_create (128);

　　30./* This is the watch descriptor returned for each item we are

　　31.watching. A real application might keep these for some use

　　32.in the application. This sample only makes sure that none of

　　33.the watch descriptors is less than 0.

　　34.*/

　　35.int wd;

　　36./* Watch all events (IN_ALL_EVENTS) for the directories and

　　37.files passed in as arguments.

　　38.Read the article for why you might want to alter this for

　　39.more efficient inotify use in your app.

　　40.*/

　　41.int index;

　　42.wd = 0;

　　43.printf("n");

　　44.for (index = 1; (index < argc) && (wd >= 0); index )

　　45.{

　　46.wd = watch_dir (inotify_fd, argv[index], IN_ALL_EVENTS);

　　47.}

　　48.if (wd > 0)

　　49.{

　　50./* Wait for events and process them until a

　　51.termination condition is detected

　　52.*/

　　53.process_inotify_events (q, inotify_fd);

　　54.}

　　55.printf ("nTerminatingn");

　　56./* Finish up by closing the fd, destroying the queue,

　　57.and returning a proper code

　　58.*/

　　59.close_inotify_fd (inotify_fd);

　　60.queue_destroy (q);

　　61.}

　　62.return 0;

　　63.}

　　利用 inotify_init 打开文件描述符

　　清单 3 展示了用于创建 inotify 实例的简单应用函数,并为其获得一个文件描述符.文件描述符返回给了调用者. 如果出现错误,返回值将为负.

　　清单 3. 使用 inotify_init

　　1./* Create an inotify instance and open a file descriptor

　　2.to access it */

　　3.int open_inotify_fd ()

　　4.{

　　5.int fd;

　　6.watched_items = 0;

　　7.fd = inotify_init ();

　　8.if (fd < 0)

　　9.{

　　10.perror ("inotify_init () = ");

　　11.}

　　12.return fd;

　　13.}

　　利用 inotify_add_watch 来增加监控

　　有了用于

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