c - C中的Inotify事件

Question

程序:

#include <stdio.h>
#include <sys/inotify.h>

int main()
{
    int fd = inotify_init();
    int wd1 = inotify_add_watch(fd, "/home/guest/a", IN_MODIFY);
    struct inotify_event *event = (struct inotify_event*) malloc(sizeof(struct inotify_event));
    read(fd, event, 1000);
    if (event->mask & IN_MODIFY) {
        printf("File '%s' is modified\n", event->name);
    }
}

输出:

$ ./a.out 
File '' is modified
$

我希望如果文件 a 被修改，上面的程序会通知文件名。但它通知没有文件名。所以，如果使用 inotify 修改了文件，如何获取文件名。

Answer 1

文档说:

The name field is present only when an event is returned for a file inside a watched directory; it identifies the file pathname relative to the watched directory. This pathname is null-terminated, and may include further null bytes ('\0') to align subsequent reads to a suitable address boundary.

所以您的问题是您期望 inotify 将名称“回显”给您，但这不是它的工作方式。