Hi,
Well the problem might be while obtaining the lock.
fopen() with let's say 'a' will open the file, and put
the cursor to the very last byte. The time period
between opening the file and getting the lock is
probably where you're clobbered.
At let's say time X, a file is opened and the writing
lock is obtained at X.2 (2 seconds later), if
something has been written to the file in these 2
seconds, then you've had it, the cursor will remain at
the position of X. So a work around could be doing an
fseek() after obtaining the lock.
http://www.devhome.net/php/tutorials/
Look at the File Handling in a Nutshell, it has some
detailed info.
> On Sat, 13 Jan 2001, 10,000 Screaming Monkeys wrote:
>
> > Hi,
> >
> > I'm having a problem with one of the PHP scripts
> I've written and I'm
> > hoping someone can point me in the right
> direction. The portion of
> > the script that is giving me trouble is the
> locking of, and writing to,
> > a logfile (plain text). I'm using flock() as I
> understand it and have
> > looked at the online manual page for it to no
> avail...
> >
> > What's happening is, under "high" traffic
> conditions on the website I
> > wrote the script for, the logfile is occasionally
> getting clobbered. I
> > tried one of the suggestions on the man page (the
> one by
> > [EMAIL PROTECTED]), but it resulted in the
> logfile being appended to,
> > rather than properly updated as I want. (better
> than being clobbered,
> > but rather confusing to cleanup after later...)
> >
> > Here is an example snippit of the script. Can
> anyone tell me what I
> > might be doing wrong, or suggest a better/more
> efficient way to write
> > this?
> >
> > <BEGIN CODE SNIP>
> > if (@fopen($dlfile, "r")) {
> >
> > $log_entries = file($download_log);
> > $total = count($log_entries);
> > $dl_time = time();
> >
> > for ($i=0; $total>$i; $i++) {
> > $split = explode("||", $log_entries[$i]);
> >
> > if ($stats_url == $split[1]) {
> > // If the file being downloaded is
> already in the logfile,
> > // increment the download count and
> update the $dl_time
> >
> > $fp = fopen($download_log, "r");
> > flock($fp,1);
> > $x = fread($fp, filesize($download_log));
> > fclose($fp);
> >
> > $fp = fopen($download_log, "w");
> > flock($fp,2);
> >
> > // Increment download counter
> > $add = $split[0]+1;
> >
> > // Do the actual update of the download
> count & latest dl time
> > $x =
>
str_replace("$split[0]||$split[1]||$split[2]||$split[3]||$split[4]||",
> "$add||$split[1]||$split[2]||$dl_time||$split[4]||",
> $x);
> >
> > fwrite($fp, $x);
> >
> > fclose($fp);
> > $write = 1;
> > }
> >
> > }
> > if ($write != 1) {
> >
> > // The file being downloaded is not in the
> logfile --
> > // add it now and start its counter at 1
> >
> > $fp = fopen($download_log, "a");
> > flock($fp,2);
> > $fw = fwrite($fp,
>
"1||$stats_url||$dl_time||$dl_time||dir2=$dir2&file=$urlfile||\n");
> > fclose($fp);
> >
> > }
> > }
> > <END CODE SNIP>
> >
> > Thanks...I'm desperate...
> >
> > - Jamie
> >
> > --
> > The sweetest cherry in an apple pie
> > <[EMAIL PROTECTED]> (Single purpose Email address)
> >
> > --
> > PHP General Mailing List (http://www.php.net/)
> > To unsubscribe, e-mail:
> [EMAIL PROTECTED]
> > For additional commands, e-mail:
> [EMAIL PROTECTED]
> > To contact the list administrators, e-mail:
> [EMAIL PROTECTED]
> >
>
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, e-mail:
> [EMAIL PROTECTED]
> For additional commands, e-mail:
> [EMAIL PROTECTED]
> To contact the list administrators, e-mail:
> [EMAIL PROTECTED]
>
=====
To Find Out More About Me : http://mukul.tsx.org/
__________________________________________________
Do You Yahoo!?
Get email at your own domain with Yahoo! Mail.
http://personal.mail.yahoo.com/
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
To contact the list administrators, e-mail: [EMAIL PROTECTED]
