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[2003-04-01 04:17 UTC] phil at concretecomputing dot co dot uk
I'm trying to run a command via proc_open(). The command always succeeds (exits with status of 0), so I would expect that proc_close() would always return 0. Most of the time it does, but sometimes it returns -1.
Here is a script which reproduces the problem. On my system, if you run the script many times, most times the status reported will be 0, but occasionally it will be -1.
<?
$inputArray = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read from
1 => array("pipe", "w"), // stdout is a pipe that the child will write to
2 => array("pipe", "w") // stderr is a pipe that the child will write to
);
$process = proc_open("ps -ef", $inputArray, $outputArray);
if (is_resource($process)) {
fclose($outputArray[0]);
// Grab the output
$output="";
while(!feof($outputArray[1])) {
$output .= fgets($outputArray[1], 1024);
}
// Extract any error output
$errorOutput = "";
while(!feof($outputArray[2])) {
$errorOutput .= fgets($outputArray[2], 1024);
}
// It is important that you close any pipes before calling proc_close() in order to avoid a deadlock
fclose($outputArray[1]);
fclose($outputArray[2]);
$status = proc_close($process);
echo "proc_close() return result: $status<br>\n";
echo "ps error output: [$errorOutput]<br>\n";
echo "ps output: [$output]<br>\n";
}
echo "Done<br>\n";
?>
PHP is compiled as follows:
'./configure' '--with-apxs=/usr/local/apache1.3.27-nerens3.4/bin/apxs' '--without-mysql' '--enable-track-vars' '--enable-sigchild' '--with-oci8=/opt/oracle/product/9.0.1' '--enable-apc' '--with-xml' '--with-expat-dir=/usr/local/expat' '--with-zlib=/usr/local/zlib' '--with-curl=/usr/local/curl' '--with-mhash=/usr/local/mhash' '--with-mcrypt=/usr/local/libmcrypt'
I have tried to have a look at what is going on using truss and I think it may be caused by another function within php doing a wait() and getting the exit status for the child so that the wait() in proc_close returns with ECHLD.
While testing using the above script, I have found that if I add a call to sleep after the proc_open() call then proc_close() _always_ returns -1 (and the sleep() call has no effect)
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Last updated: Tue Nov 04 08:00:01 2025 UTC |
We have the same issue with pclose() Testcase: <?php $fp = popen("ls","r"); if ($fp) { while(! feof($fp)) { fgets($fp,1024); } $status = pclose($fp); print "pclose: status=$status\n"; } ?> Most of the time $status is -1, sometimes 0. PHP-4.3.2RC1, Solaris 7, --enable-sigchild PHP is compiled with --enable-sigchild because the oracle client is needed too, this was recommended in former bug descriptions. Is this still the case for oracle?