Re: [PHP] File locking problem
I'm having file locking problems. I'm using fopen() to write a file via FTP. At the end, I'm doing... fflush($fp); fclose($fp); ...and then I include it immediately after. But many times I only get part of what I wrote to the file, which suggests that it wasn't really flushed and closed properly. Do you use include or require. In such situation you should not use include. -- Krzysztof Dziekiewicz -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] File locking problem
Krzysztof Dziekiewicz wrote... Do you use include or require. In such situation you should not use include. I tried require() too, but it made no difference. I later learned that if you fopen(), write some stuff, fflush() and ffclose(), that doesn't mean the file is complete (or that it even exists). This has to be a PHP bug, which I'd be happy to file if someone more experienced could confirm that it isn't stupid user error. For a workaround, after I fflush() and fclose() I while() until the file exists, and then while() until it's larger than 10 bytes. I should while() until it's the size of the data I've written, but this method has been reliable so far. -- Charles Wiltgen Well, once again my friend, we find that science is a two-headed beast. One head is nice, it gives us aspirin and other modern conveniences... but the other head of science is bad! Oh beware the other head of science...it bites! -- The Tick -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] File locking problem
At 16:50 08.11.2002, Charles Wiltgen spoke out and said: [snip] I tried require() too, but it made no difference. I later learned that if you fopen(), write some stuff, fflush() and ffclose(), that doesn't mean the file is complete (or that it even exists). This has to be a PHP bug, which I'd be happy to file if someone more experienced could confirm that it isn't stupid user error. [snip] I don't believe it has something to do with PHP, much more with the FTP server you're accessing... This might delay the actual flushing for what reason ever. I don't believe PHP buffers files differently if they are accessed using an fopen url wrapper. -- O Ernest E. Vogelsinger (\) ICQ #13394035 ^ http://www.vogelsinger.at/
Re: [PHP] File locking problem
Ernest E Vogelsinger wrote... This has to be a PHP bug, which I'd be happy to file if someone more experienced could confirm that it isn't stupid user error. I don't believe it has something to do with PHP, much more with the FTP server you're accessing... This might delay the actual flushing for what reason ever. I don't believe PHP buffers files differently if they are accessed using an fopen url wrapper. The Linux system I'm FTPing to is using ProFTPD, which as I understand it is one of the best open-source servers out there. I will add a note to the documentation along the lines of If you fopen() to an FTP URI, write some stuff, fflush() and ffclose(), that doesn't mean the file is complete (or that it even exists). Check for both of these things before you do anything with the file. Thanks! -- Charles Wiltgen -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] File locking problem
Charles Wiltgen wrote... I'm having file locking problems. I'm using fopen() to write a file via FTP. At the end, I'm doing... fflush($fp); fclose($fp); ...and then I include it immediately after. But many times I only get part of what I wrote to the file, which suggests that it wasn't really flushed and closed properly. BTW, when I only get part of the file in the browser, I open it with Pico and it's all there. So I know that $stuff = ob_end_clean() is working, and that $stuff is being written to the fopen(ftp://...) pointer correctly. I suspect that PHP is including before the file is closed, but not returning an error. I haven't found any other mechanisms in PHP that would allow me to verify that the file is really, really, really closed after using fflush() and fclose() on an fopen(ftp://...;). Any ideas? -- Charles Wiltgen -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] File locking problem
Charles, 2 questions-- 1) What OS are you using? 2) Does the file include PHP code? Otherwise, can you keep its contents in a string and simply output that string? If it contains PHP code, are you sure that there aren't any errors in the PHP code? Ok, so it was a bit more than 2 questions :-) Marco -- php|architect - The magazine for PHP Professionals The first monthly worldwide magazine dedicated to PHP programmer Come visit us at http://www.phparch.com! ---BeginMessage--- Charles Wiltgen wrote... I'm having file locking problems. I'm using fopen() to write a file via FTP. At the end, I'm doing... fflush($fp); fclose($fp); ...and then I include it immediately after. But many times I only get part of what I wrote to the file, which suggests that it wasn't really flushed and closed properly. BTW, when I only get part of the file in the browser, I open it with Pico and it's all there. So I know that $stuff = ob_end_clean() is working, and that $stuff is being written to the fopen(ftp://...) pointer correctly. I suspect that PHP is including before the file is closed, but not returning an error. I haven't found any other mechanisms in PHP that would allow me to verify that the file is really, really, really closed after using fflush() and fclose() on an fopen(ftp://...;). Any ideas? -- Charles Wiltgen -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php ---End Message--- -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] File locking problem
Marco Tabini wrote... 1) What OS are you using? Linux. 2) Does the file include PHP code? Yes. If it contains PHP code, are you sure that there aren't any errors in the PHP code? Yes. The resulting XHTML validates when the include works (more than half the time). The rest of the time, the file is being created correctly but not included correctly. I've tried to include() and require(). No error is ever generated, I suspect because the file exists, and include/require are being called while the file is still open (even though I've flushed and closed it). Shoot. -- Charles Wiltgen -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] File locking problem
Ok, here's another possibly stupid solution. Have you tried (a) setting a pause (like 2 secs) between when you end writing and include the file or (b) writing the file, then refreshing the page with a parameter and including it only then? In the latter case, terminating the script and refreshing it might cause the o/s to properly flush the file buffers. Just a couple of thoughts. Hope this helps. Marco - php|architect -- The Monthly Magazine For PHP Professionals Come visit us on the web at http://www.phparch.com! On Thu, 2002-11-07 at 17:58, Charles Wiltgen wrote: Marco Tabini wrote... 1) What OS are you using? Linux. 2) Does the file include PHP code? Yes. If it contains PHP code, are you sure that there aren't any errors in the PHP code? Yes. The resulting XHTML validates when the include works (more than half the time). The rest of the time, the file is being created correctly but not included correctly. I've tried to include() and require(). No error is ever generated, I suspect because the file exists, and include/require are being called while the file is still open (even though I've flushed and closed it). Shoot. -- Charles Wiltgen -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] File locking problem
Marco Tabini wrote... Ok, here's another possibly stupid solution. Not at all. My solution was not far from that -- I have to wait for the file to exist, and then to have something in it, and then include it. (See my PHP fopen() bug + solution post.) Thank you, -- Charles Wiltgen -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] File locking problem
Just a (possibly stupid) suggestion--is it possible that the file is being overwritten by another instance of your script that's run in the meantime? - php|architect -- The Magazine for PHP Professionals Check us out on the web at http://www.phparch.com On Wed, 2002-11-06 at 23:06, Charles Wiltgen wrote: Hello, I'm having file locking problems. I'm using fopen() to write a file via FTP. At the end, I'm doing... fflush($fp); fclose($fp); ...and then I include it immediately after. But many times I only get part of what I wrote to the file, which suggests that it wasn't really flushed and closed properly. What else can I do? Thanks, -- Charles Wiltgen Well, once again my friend, we find that science is a two-headed beast. One head is nice, it gives us aspirin and other modern conveniences... but the other head of science is bad! Oh beware the other head of science...it bites! -- The Tick -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] File locking problem
Marco Tabini wrote... Just a (possibly stupid) suggestion--is it possible that the file is being overwritten by another instance of your script that's run in the meantime? This may also be a problem at some point, but currently I'm just trying to get it working in an test environment where only one instance is running. I know I can just use another empty file as a semaphore, but my performance is already killed by having to use FTP to create and delete files with PHP, and I need to do whatever I can do avoid it. Basically, it appears that using fflush() and fclose() is no guarantee that a file is completely written, and I'm wondering what I can do besides insert sleep() statements. -- Charles Wiltgen Love is a snowmobile racing across the tundra and then suddenly it flips over, pinning you underneath. At night, the ice weasels come. - Nietzsche (Groening) -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
