--- "Ellis, Lantz C. CDR (C3F J32)" <[EMAIL PROTECTED]> wrote:
> Any idea why I would be getting a 'does not support flock' statement
> returned while running a cgi on the server? The cgi should open a file and
> lock it while I add data and then release the lock when done. I am writing
> a very simple shopping cart cgi and I need to store the order in the
> client's shopping cart. I am using a text file in my account directory as a
> flat file to store the info.
> Thanks,
> Lantz
Hi Lantz,
I use an indirect method for locking files, which works fine on all platforms.
I borrowed the method from a Matthew Wright script (tweaked a bit for my own
taste in Perl style). The subroutines are as follows:
sub lockFile {
# Create a lock file for the file passed as a parameter.
# If no parameter is passed, return a false value.
$_ = shift or return 0;
$_ = $_ . '.lock';
my $i;
for ($i = 0; $i < $timeOut; $i++) {
(-e $_)
and sleep 1
and next;
open LOCK, ">$_" or &outputError("Can't create lock file",
$!);
print LOCK '0';
close LOCK;
last;
}
return 1;
}
sub unlockFile {
$_ = shift;
$_ = $_ . '.lock';
(-e $_) and unlink or &outputError("Can't delete the lockfile", $!);
}
If a file with the same name, appended with '.lock' exists, then the script
checks every second up to the number of seconds specified in $timeOut ( I use 3
) before allowing the file to be overwritten (this stops problems with writing
to the file if a previous call was cancelled before deleting the lock file).
Use them as follows:
&lockFile( $file_name );
# Do stuff to $file_name here
&unlockFile( $file_name );
Its a bit clunky, but it works on Mac, Unix and Windoze.
HTH,
Richard
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