note 102239 added to function.proc-open

If you are, like me, tired of the buggy way proc_open handles streams and exit codes; this example demonstrate the power of pcntl, posix and some simple output redirection:

<?php
$outpipe = '/tmp/outpipe';
$inpipe = '/tmp/inpipe';
posix_mkfifo($inpipe, 0600);
posix_mkfifo($outpipe, 0600);

$pid = pcntl_fork();

//parent
if($pid) {
	$in = fopen($inpipe, 'w');
	fwrite($in, "A message for the inpipe reader\n");
	fclose($in);
	
	$out = fopen($outpipe, 'r');
	while(!feof($out)) {
		echo "From out pipe: " . fgets($out) . PHP_EOL;
	}
	fclose($out);

	pcntl_waitpid($pid, $status);
	
	if(pcntl_wifexited($status)) {
		echo "Reliable exit code: " . pcntl_wexitstatus($status) . PHP_EOL;
	}
	
	unlink($outpipe);
	unlink($inpipe);
}

//child
else {
	//parent
	if($pid = pcntl_fork()) {
		pcntl_exec('/bin/sh', array('-c', "printf 'A message for the outpipe reader' > $outpipe 2>&1 && exit 12"));
	}
	
	//child
	else {
		pcntl_exec('/bin/sh', array('-c', "printf 'From in pipe: '; cat $inpipe"));
	}	
}
?>

Output:

From in pipe: A message for the inpipe reader
From out pipe: A message for the outpipe reader
Reliable exit code: 12
----
Server IP: 85.19.212.230
Probable Submitter: 212.33.136.212
----
Manual Page -- http://www.php.net/manual/en/function.proc-open.php
Edit        -- https://master.php.net/note/edit/102239
Del: integrated  -- https://master.php.net/note/delete/102239/integrated
Del: useless     -- https://master.php.net/note/delete/102239/useless
Del: bad code    -- https://master.php.net/note/delete/102239/bad+code
Del: spam        -- https://master.php.net/note/delete/102239/spam
Del: non-english -- https://master.php.net/note/delete/102239/non-english
Del: in docs     -- https://master.php.net/note/delete/102239/in+docs
Del: other reasons-- https://master.php.net/note/delete/102239
Reject      -- https://master.php.net/note/reject/102239
Search      -- https://master.php.net/manage/user-notes.php