Public bug reported:
Compile the following program (inotifyerr.c)
#include <stdlib.h>
#include <stdio.h>
#include <sys/inotify.h>
int main(int argc, char* argv[]){
int fd = inotify_init();
if (fd == -1){
perror("inotify_init");
}
char path[256];
sprintf(path,"/proc/%s",argv[1]);
printf("watching %s\n",path);
int wd = inotify_add_watch(fd,path,IN_ALL_EVENTS);
if (wd == -1){
perror("inotify_add_watch");
}
char buf[1024];
ssize_t siz = read(fd,buf,1024);
if (siz == -1){
perror("inotify read");
}
printf("read done, bytes: %d\n",siz);
}
gcc inotifyerr.c
The program is supposed to watch events occurring on file /proc/nnn, where nnn
is passed as
argument to program invokation.
Then start a process in background, and watch it with the program above. E.g.
$ sleep 20 &
[1] 8246
$ ls /proc/8246
attr cpuset io mountinfo pagemap smaps wchan
auxv cwd latency mounts personality stat
cgroup environ limits mountstats root statm
clear_refs exe loginuid net sched status
cmdline fd maps oom_adj schedstat syscall
coredump_filter fdinfo mem oom_score sessionid task
$ ./a.out 8246
watching /proc/8246
^C
[1]+ Done sleep 20
Note that the background process and the inotifyerr one are run from
within the same terminal, same user, and that the latter has read
access to the file being watched.
No events are reported.
The expected behaviour of inotify is to report events on /proc files
and directories instead.
Additional information:
I have run the same test also with superuser privileges, but the result
is the same.
I have modified the test program so as to make the process to whatch
a child of the inotifyerr one. In this case inotify catches all the events.
Ubuntu 9.04. 2.6.28-15-generic #52-Ubuntu SMP Wed Sep 9 10:49:34 UTC
2009 i686 GNU/Linux
** Affects: ubuntu
Importance: Undecided
Status: New
--
inotify does not watch /proc
https://bugs.launchpad.net/bugs/454722
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