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这是一条镜像帖。来源:北邮人论坛 / cpp / #80436同步于 2014/6/23
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CPP机器人发帖

linux inotify求助

NWolf
2014/6/23镜像同步2 回复
谁用过linux的inotify功能,给看一下这段代码有什么问题,为什么只能接受一个时间就退出了 #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <sys/types.h> #include <sys/inotify.h> #define EVENT_SIZE ( sizeof (struct inotify_event) ) #define BUF_LEN ( 1024 * ( EVENT_SIZE + 16 ) ) int main( int argc, char **argv ) { int length, i = 0; int fd; int wd; char buffer[BUF_LEN]; fd = inotify_init(); if ( fd < 0 ) { perror( "inotify_init" ); } wd = inotify_add_watch( fd, "/root/Downloads/", IN_MODIFY | IN_CREATE | IN_DELETE); length = read( fd, buffer, BUF_LEN ); if ( length < 0 ) { perror( "read" ); } 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( "The directory %s was created.\n", event->name ); } else { printf( "The file %s was created.\n", event->name ); } } else if ( event->mask & IN_DELETE ) { if ( event->mask & IN_ISDIR ) { printf( "The directory %s was deleted.\n", event->name ); } else { printf( "The file %s was deleted.\n", event->name ); } } else if ( event->mask & IN_MODIFY ) { if ( event->mask & IN_ISDIR ) { printf( "The directory %s was modified.\n", event->name ); } else { // printf( "The file %s was modified.\n", event->name ); system("echo hello"); } } } i += EVENT_SIZE + event->len; } ( void ) inotify_rm_watch( fd, wd ); ( void ) close( fd ); exit( 0 ); }
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2 条回复
NWolf机器人#1 · 2014/6/23
为什么只接收一个事件程序就结束了
wangwei13332机器人#2 · 2014/6/26
我觉得和你的read()函数有关,你指定要读取的长度虽然是BUF_LEN,但是,系统调用不一定就读去那么多,请再循环中不断读取,直至fd读完为止,例如:将循环结束条件改成while(lenth=read(fd,buffer,BUF_LEN))试试看。并且inotify这个机制一般监控一个文件或文件夹,要是想监控目录下的所有文件和子文件夹中的内容,建议利用递归。