Re: [LIP] problem with fcntl while locking file on NFS

Binand,

I tried with "ssll" instead of "ssLL" but still 
facing the same problem -

  "INFO    >> Could not lock file Invalid argument"


I am not sure about nfs server, but i am not dealing
with large files. BTW, i tried handling the EINVAL in
the same way as i am handling EINTR, but this ended 
up in an infinite loop and process got hung (strace
showed it was in an infinite loop).

snip of the code that i had tried -

   $buf  = pack("ssLL", F_WRLCK ,0,0,0);
   while (1)
   {
      unless (fcntl($fh, F_SETLKW, $buf))
      {
        next if ($! =~ /^Interrupted|Invalid/); # <---
note the change
        $msg = "Could not lock file $!";
        $err++;
        last;
      }
      else
      {
        $msg = "File locked";
        last;
      }
  }



- gaurav

[email protected] wrote:

>Gaurav Varshney posted in linux-india-programmers:
>
>>I am using fcntl for locking the file on linux
(flock
>>doesn't work properly on NFS), and facing problem.
>>Following code works most of the time but fails
>>sometime with the error message "Invalid argument"
>>(EINVAL). What could be the reason for this error 
>>message and how it can be handled ?
>>
>>
>>   $buf  = pack("ssLL", F_WRLCK ,0,0,0);
>
>
>Shouldn't that be "ssll"? man fcntl seems to think
so.
>
>I think file locking over NFS is dicey, whatever the
locking method you
>use. Is your NFS server Linux too? Are you dealing
with big files (> 2GB)?
>
>Binand
>



Cheers,
Gaurav Varshney


		
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