gzopen and locking

Hi,

I need to use gzopen and gzwrite, but I also need to lock the file
opened in order to prevent concurrent accesses.

Unfortunately, flock doesn't seem working with gzopen as I get this
error :

[25-Jan-2006 11:40:07] PHP Warning: flock(): cannot represent a stream
of type ZLIB as a File Descriptor in xxxx/gz.php4 on line 5

Is there a way to lock a file opened with gzopen ?

I tried not using flock, but after some time, the gz file is corrupted
:

zcat: xxxx.log.gz: invalid compressed data--format violated

Thanks !

.

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