inotify监测实例

/*************************************************************************
    > File Name: inotify.c
    > 监测一个目录下的文件变化，增加或删除提示
    > Created Time: Thu 21 Sep 2017 02:41:48 PM CST
 ************************************************************************/

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

int read_process_inotify_fd(int inotify_fd)
{
    int res;
    char event_buf[512];
    int event_size;
    int event_pos = 0;
    struct inotify_event *event;
    res = read(inotify_fd, event_buf, sizeof(event_buf));
    if(res < sizeof(struct inotify_event))
    {
        if(errno == EINTR)
        {
            return 0;
        }
        printf("can not get event ,%s
",strerror(errno));
        return -1;
    }

    while(res >= (int)sizeof(*event)) {
        event = (struct inotify_event *)(event_buf + event_pos); //指向下一个结构体
        if(event->len) {
            if(event->mask & IN_CREATE) {
                printf("Add device '%s' due to inotify event
", event->name);
            } else {
                printf("Removing device '%s' due to inotify event
", event->name);
            }
        }
        event_size = sizeof(*event) + event->len;
        res -= event_size;
        event_pos += event_size; //跳转到下一个结构体 
    }
    return 0;
}

int main(int argc ,char **argv)
{
    int fd;
    if(argc < 2)
    {
        printf("Usage: %s <dir>
",argv[0]);
        return -1;
    }
    // inotify_init
    fd = inotify_init();
    // add watch
    //添加监控：argv[1]监控目录，IN_DELETE|IN_CREATE 监控 创建和删除
    inotify_add_watch(fd, argv[1], IN_DELETE|IN_CREATE); 
    // read
    while(1)
    {
        read_process_inotify_fd(fd);
    }
    return 0;
}