lkml.org 
[lkml]   [2013]   [Jun]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subject[BUG] Using inotify on /proc/partitoins
Hi all,
I wanted to monitor /proc/partitions using inotify.Although now i know it can't catch the event of write.
But for read,it can't catch. The code is:
int main()
{
int fd = inotify_init();
int wd;
char buff[4096];
int ret;
if (fd < 0)
perror("inotify_init error\n");

wd = inotify_add_watch(fd, "/proc/partitions", IN_ACCESS);
if (wd < 0)
perror("inotify_add_watch error\n");


ret = read(fd, buff, 4096);
if (ret < 0)
perror("read error\n");
else
printf("buff %s\n", buff);
return 0;
}

But when i call 'cat /proc/partitions',the program can't return.
So i added some message in kernel in order to find the reason.
In procfs for some files, the inode used this method to alloc.
proc_lookup-->proc_lookup_de--->proc_get_inode-->new_inode_pseudo
In new_inode_pseudo, it will alloc new inode so every open-operation procfs will alloc new inode.
So inotify can't work.

I think it should add a flag which indicate file can't support inotify.Although there are a few files in procfs.


Thanks!
Jianpeng
\
 
 \ /
  Last update: 2013-06-14 03:41    [W:0.027 / U:0.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site