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[2005-11-06 22:07 UTC] larryjadams at comcast dot net
Description:
------------
If I call $my_fd = popen("mycommand", "rb"); to a function that hangs/suspends and then subsquently call:
stream_select(...) using $read=array($my_fd) with a timeout, the steam_select returns immediately, event if I have set $my_fd as blocking using stream_set_blocking();
I would like stream_select to wait on output from the pipe prior to firing, or to drive a timeout.
Thanks,
Larry Adams
The Cacti Group
Reproduce code:
---------------
if (function_exists("stream_select")) {
if ($config["cacti_server_os"] == "unix") {
$fp = popen($command, "r");
}else{
$fp = popen($command, "rb");
}
/* set script server timeout */
$script_timeout = read_config_option("script_timeout");
/* establish timeout variables */
$to_sec = floor($script_timeout/1000);
$to_usec = ($script_timeout%1000)*1000;
/* Prepare the read array */
$read = array($fp);
stream_set_blocking ($fp, 1);
if (false === ($num_changed_streams = stream_select($read, $write = NULL, $except = NULL, $to_sec, $to_usec))) {
cacti_log("WARNING: SERVER POPEN Timed out.");
$output = "U";
}elseif ($num_changed_streams > 0) {
$output = fgets($fp, 4096);
}
pclose($fp);
}else{
$output = `$command`;
}
$command = a file with the following:
<?php sleep(20); echo "Hello:20.00\n"; ?>
The stream_select timeout is 5 seconds.
Expected result:
----------------
popen will be called, stream_select will block until timeout has expired, the number of fd's changed will be 0 and my result will be as expected.
Actual result:
--------------
stream_select returns immediately.
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Last updated: Tue Oct 28 07:00:01 2025 UTC |
The set block option now works. However, the stream select still waits for the script to return or for ever, whichever comes first :). Here is the revised code. Simply place test1.php and test2.php in the c:\ directory. test1.php <?php $command = "php -q c:/test2.php"; if (function_exists("stream_select")) { $fp = popen($command, "rb"); /* set script server timeout in milliseconds */ $script_timeout = 5000; /* establish timeout variables */ $to_sec = floor($script_timeout/1000); $to_usec = ($script_timeout%1000)*1000; /* Prepare the read array */ $read = array($fp); stream_set_blocking ($fp, 1); if (false === ($num_changed_streams = stream_select($read, $write = NULL, $except = NULL, $to_sec, $to_usec))) { echo "WARNING: SERVER POPEN Timed out.\n"; $output = "U"; }elseif ($num_changed_streams > 0) { $output = fgets($fp, 4096); echo "Command Exited with a Result of '" . trim($output) . "'\n"; } pclose($fp); }else{ $output = `$command`; } ?> test2.php <?php sleep(20);echo "Ehllo\n"; ?> TheWitness