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demo_inotify.c
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demo_inotify.c
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/**********************************************************************\
* Copyright (C) Michael Kerrisk, 2010. *
* *
* This program is free software. You may use, modify, and redistribute *
* it under the terms of the GNU Affero General Public License as *
* published by the Free Software Foundation, either version 3 or (at *
* your option) any later version. This program is distributed without *
* any warranty. See the file COPYING for details. *
\**********************************************************************/
/* demo_inotify.c
Demonstrate the use of the inotify API.
Usage: demo_inotify pathname...
The program monitors each of the files specified on the command line for all
possible file events.
This program is Linux-specific. The inotify API is available in Linux 2.6.13
and later.
*/
#include <sys/inotify.h>
#include <limits.h>
#include "tlpi_hdr.h"
static void /* Display information from inotify_event structure */
displayInotifyEvent(struct inotify_event *i)
{
printf(" wd =%2d; ", i->wd);
if (i->cookie > 0)
printf("cookie =%4d; ", i->cookie);
printf("mask = ");
if (i->mask & IN_ACCESS) printf("IN_ACCESS ");
if (i->mask & IN_ATTRIB) printf("IN_ATTRIB ");
if (i->mask & IN_CLOSE_NOWRITE) printf("IN_CLOSE_NOWRITE ");
if (i->mask & IN_CLOSE_WRITE) printf("IN_CLOSE_WRITE ");
if (i->mask & IN_CREATE) printf("IN_CREATE ");
if (i->mask & IN_DELETE) printf("IN_DELETE ");
if (i->mask & IN_DELETE_SELF) printf("IN_DELETE_SELF ");
if (i->mask & IN_IGNORED) printf("IN_IGNORED ");
if (i->mask & IN_ISDIR) printf("IN_ISDIR ");
if (i->mask & IN_MODIFY) printf("IN_MODIFY ");
if (i->mask & IN_MOVE_SELF) printf("IN_MOVE_SELF ");
if (i->mask & IN_MOVED_FROM) printf("IN_MOVED_FROM ");
if (i->mask & IN_MOVED_TO) printf("IN_MOVED_TO ");
if (i->mask & IN_OPEN) printf("IN_OPEN ");
if (i->mask & IN_Q_OVERFLOW) printf("IN_Q_OVERFLOW ");
if (i->mask & IN_UNMOUNT) printf("IN_UNMOUNT ");
printf("\n");
if (i->len > 0)
printf(" name = %s\n", i->name);
}
#define BUF_LEN (10 * (sizeof(struct inotify_event) + NAME_MAX + 1))
int
main(int argc, char *argv[])
{
int inotifyFd, wd, j;
char buf[BUF_LEN];
ssize_t numRead;
char *p;
struct inotify_event *event;
if (argc < 2 || strcmp(argv[1], "--help") == 0)
usageErr("%s pathname...\n", argv[0]);
inotifyFd = inotify_init(); /* Create inotify instance */
if (inotifyFd == -1)
errExit("inotify_init");
/* For each command-line argument, add a watch for all events */
for (j = 1; j < argc; j++) {
wd = inotify_add_watch(inotifyFd, argv[j], IN_ALL_EVENTS);
if (wd == -1)
errExit("inotify_add_watch");
printf("Watching %s using wd %d\n", argv[j], wd);
}
for (;;) { /* Read events forever */
numRead = read(inotifyFd, buf, BUF_LEN);
if (numRead == 0)
fatal("read() from inotify fd returned 0!");
if (numRead == -1)
errExit("read");
printf("Read %ld bytes from inotify fd\n", (long) numRead);
/* Process all of the events in buffer returned by read() */
for (p = buf; p < buf + numRead; ) {
event = (struct inotify_event *) p;
displayInotifyEvent(event);
p += sizeof(struct inotify_event) + event->len;
}
}
exit(EXIT_SUCCESS);
}