inotify_directory.c

inotify_directory.c

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <linux/inotify.h>
#include <signal.h>

#define EVENT_SIZE  ( sizeof (struct inotify_event) )
#define EVENT_BUF_LEN     ( 1024 * ( EVENT_SIZE + 16 ) )

static int fd, wd;

void cleanup(void)
{
    inotify_rm_watch(fd, wd);
    close(fd);
}

void intHandler(int dummy) {
    printf("QUIT\n");
    cleanup();
    exit(0);
}

int main(int argc,char *argv[])
{
    int length;
    char buffer[EVENT_BUF_LEN];

    signal(SIGINT, intHandler);

    if (argc != 2) {
        printf("Usage: %s directory\n",argv[0]);
        return 1;
    }

    fd = inotify_init();

    if (fd < 0) {
        perror("inotify_init");
    }

    if (inotify_add_watch(fd, argv[1], IN_CREATE | IN_DELETE) == -1)
    {
        perror("inotify_add_watch");
    }

    while (1)
    {
        int i = 0;
        char path[128];
        struct inotify_event *event = ( struct inotify_event * ) &buffer[i];

        /* blocks until the change event occurs */
        length = read(fd, buffer, EVENT_BUF_LEN);

        if (length < 0) {
            perror("read");
        }

        if (event->len) {
            if (event->mask & IN_CREATE) {
                if (event->mask & IN_ISDIR) {
                    printf("New directory %s created.\n", event->name);
                    sprintf(path, "%s/%s", argv[1], event->name);

                    if (inotify_add_watch(fd, path, IN_CREATE | IN_DELETE) == -1)
                    {
                        perror("inotify_add_watch");
                    }
                }
                else {
                    printf("New file %s created.\n", event->name);
                }
            }
            else if (event->mask & IN_DELETE) {
                if (event->mask & IN_ISDIR) {
                    printf("Directory %s deleted.\n", event->name);
                    sprintf(path, "%s/%s", argv[1], event->name);

                    if (inotify_rm_watch(fd, path, IN_CREATE | IN_DELETE) == -1)
                    {
                        perror("inotify_rm_watch");
                    }

                }
                else {
                    printf("File %s deleted.\n", event->name);
                }
            }
        }

        i += EVENT_SIZE + event->len;
    }
}