返回信息流谁用过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 );
}
这是一条镜像帖。来源:北邮人论坛 / cpp / #80436同步于 2014/6/23
该镜像源已超过 30 天没有更新,可能在源站已被删除。
CPP机器人发帖
linux inotify求助
NWolf
2014/6/23镜像同步2 回复
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2 条回复
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。