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Date: Tue, 24 Jan 2006 01:17:39 +0000
To: Mark Krenz <mark@suso.org>
Cc: internals@lists.php.net
In-Reply-To: <20060123163515.GB13342@arvo.suso.org>
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References: <20060123031050.GD23755@arvo.suso.org>
	<4e89b4260601230608p18596cdchddcf0a460b79d37f@mail.gmail.com>
	<20060123163515.GB13342@arvo.suso.org>
Subject: Re: [PHP-DEV] Fwd: [PHP] proc_open and buffer limit?
From: kingwez@gmail.com (Wez Furlong)

I suggest running the script using strace:

strace -e trace=3Dfile php myscript.php

and taking a look to see what the underlying read/write syscalls are up to.

--Wez.

On 1/23/06, Mark Krenz <mark@suso.org> wrote:
>
>   Thanks for your help.  stream_copy_to_stream does seem like a better
> way to go.  However I still have the same problem.  Only 65536 bytes are
> written to /tmp/output.txt.  Here is the new source code based on your
> ideas:
>
> -------------------------------------------------------------------------=
-
> $program =3D "/usr/bin/dd of=3D/tmp/output.txt";
>
> $descriptorspec =3D array(
>    0 =3D> array("pipe", "r"),
>    1 =3D> array("pipe", "w"),
>    2 =3D> array("file", "/tmp/error-output.txt", "a")
> );
>
> $cwd =3D '/var/www';
> $env =3D array('HOME' =3D> '/var/www');
>
> $process =3D proc_open($program, $descriptorspec, $pipes, $cwd, $env);
>
> if (is_resource($process)) {
>
>     stream_set_blocking($pipes[0], FALSE);
>     stream_set_blocking($pipes[1], FALSE);
>
>     $handle =3D fopen("/usr/share/dict/words", "r");
>
>     stream_copy_to_stream($handle, $pipes[0]);
>     fclose($pipes[0]);
>     fclose($handle);
>     $output =3D stream_get_contents($pipes[1]);
>     fclose($pipes[1]);
>
>     print "<PRE>$output</PRE><BR><BR>\n";
>
>     $return_value =3D proc_close($process);
>
>     echo "command returned $return_value\n";
> }
> -------------------------------------------------------------------------=
-
>
>   I switched to using dd instead of cat because using cat made the
> situation more complex (because it sends back data as it gets it).  The
> program I'm going to eventually do this with doesn't do that.
>
>
> On Mon, Jan 23, 2006 at 02:08:55PM GMT, Wez Furlong [kingwez@gmail.com] s=
aid the following:
> > There are quite a few bad streams usages there.
> >
> > I'd rewrite your code like this:
> >
> > $words =3D fopen('/usr/share/dict/words', 'r');
> > stream_copy_to_stream($words, $pipes[0]);
> > fclose($pipes[0]);
> > fclose($words);
> > $output =3D stream_get_contents($pipes[1]);
> > fclose($pipes[1]);
> > proc_close($process);
> >
> > My guess at the cause of the problem was that you're tying to write
> > 2MB into a pipe, and the underlying write() syscall could only write
> > 64k; since you're ignoring the return code from fwrite(), you're
> > missing this vital fact.
> >
> > Using the streams functions in PHP 5 helps you to write code that
> > "does what I mean", and makes for shorter, more readable code.
> >
> > --Wez.
> >
> > PS: http://netevil.org/talks/PHP-Streams-Lucky-Dip.pdf
> > has some tips and insider knowledge on using streams in PHP.
> >
> >
> >
> > On 1/23/06, Mark Krenz <mark@suso.org> wrote:
> > >     stream_set_blocking($pipes[0], FALSE);
> > >     stream_set_blocking($pipes[1], FALSE);
> > >
> > >     $handle =3D fopen("/usr/share/dict/words", "r");
> > >     while (!feof($handle)) {
> > >         $input .=3D fread($handle, 8192);
> > >     }
> > >
> > >     fwrite($pipes[0], $input);
> > >     fclose($handle);
> > >     fclose($pipes[0]);
> > >
> > >     while (!feof($pipes[1])) {
> > >        $output .=3D fgets($pipes[1], 8192);
> > >     }
> > >     fclose($pipes[1]);
> > >
> > >      print "<PRE>$output</PRE><BR><BR>\n";
> > >
> > >     $return_value =3D proc_close($process);
> > >
> > >     echo "command returned $return_value\n";
> > > }
> >
>
>
> --
> Mark S. Krenz
> IT Director
> Suso Technology Services, Inc.
> http://suso.org/
>
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