inotify的一个简单程序

╰+哭是因爲堅強的太久メ 2022-08-13 06:59 180阅读 0赞

**inotify的一个简单程序**

**下面给出使用inotify的一个简单示例：**

/*This is the sample program to notify us for the file creation and file deletion takes place in “/tmp” directory*/
    #include <stdio.h>
    #include <stdlib.h>
    #include <errno.h>
    #include <sys/types.h>
    #include <linux/inotify.h>
    
    #define EVENT_SIZE  ( sizeof (struct inotify_event) )
    #define EVENT_BUF_LEN     ( 1024 * ( EVENT_SIZE + 16 ) )
    
    int main( )
    {
      int length, i = 0;
      int fd;
      int wd;
      char buffer[EVENT_BUF_LEN];
    
      /*creating the INOTIFY instance*/
      fd = inotify_init();
    
      /*checking for error*/
      if ( fd < 0 ) {
        perror( "inotify_init" );
      }
    
      /*adding the “/tmp” directory into watch list. Here, the suggestion is to validate the existence of the directory before adding into monitoring list.*/
      wd = inotify_add_watch( fd, "/tmp", IN_CREATE | IN_DELETE );
    
      /*read to determine the event change happens on “/tmp” directory. Actually this read blocks until the change event occurs*/ 
    
      length = read( fd, buffer, EVENT_BUF_LEN ); 
    
      /*checking for error*/
      if ( length < 0 ) {
        perror( "read" );
      }  
    
      /*actually read return the list of change events happens. Here, read the change event one by one and process it accordingly.*/
      while ( i < length ) {     struct inotify_event *event = ( struct inotify_event * ) &buffer[ i ];     if ( event->len ) {
          if ( event->mask & IN_CREATE ) {
            if ( event->mask & IN_ISDIR ) {
              printf( "New directory %s created.\n", event->name );
            }
            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 );
            }
            else {
              printf( "File %s deleted.\n", event->name );
            }
          }
        }
        i += EVENT_SIZE + event->len;
      }
      /*removing the “/tmp” directory from the watch list.*/
       inotify_rm_watch( fd, wd );
    
      /*closing the INOTIFY instance*/
       close( fd );
    
    }