inotify.c

#include <unistd.h>
#include <stdio.h>
#include <sys/inotify.h>
#include <string.h>
#include <errno.h>


/*
 *参考: frameworks\native\services\inputflinger\EventHub.cpp
 */

/*Usage: inotify <dir> */

int read_process_inotify_fd(int fd)
{
	int res;
    char event_buf[512];
    int event_size;
    int event_pos = 0;
    struct inotify_event *event;
	
	/* read */	
    res = read(fd, event_buf, sizeof(event_buf));

    if(res < (int)sizeof(*event)) {
        if(errno == EINTR)
            return 0;
        printf("could not get event, %s\n", strerror(errno));
        return -1;
    }

	/* process
	 * 读到的数据是1个或多个inotify_event
	 * 它们的长度不一样
	 * 逐个处理
	 */

    while(res >= (int)sizeof(*event)) {
        event = (struct inotify_event *)(event_buf + event_pos);
        //printf("%d: %08x \"%s\"\n", event->wd, event->mask, event->len ? event->name : "");
        if(event->len) {
            if(event->mask & IN_CREATE) {
                printf("create file: %s\n", event->name);
            } else {
                printf("delete file: %s\n", event->name);
            }
        }
        event_size = sizeof(*event) + event->len;
        res -= event_size;
        event_pos += event_size;
    }
	return 0;
}

int main(int argc, char **argv)
{
	int mINotifyFd;
	int result;

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

	/* inotify_init */

    mINotifyFd = inotify_init();

	/* add watch */
    result = inotify_add_watch(mINotifyFd, argv[1], IN_DELETE | IN_CREATE);

	/* read */
	while (1)
	{
		read_process_inotify_fd(mINotifyFd);
	}

	return 0;
}