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proc_close

(PHP 4 >= 4.3.0, PHP 5)

proc_closeClose a process opened by proc_open() and return the exit code of that process

Description

int proc_close ( resource $process )

proc_close() is similar to pclose() except that it only works on processes opened by proc_open(). proc_close() waits for the process to terminate, and returns its exit code. If you have open pipes to that process, you should fclose() them prior to calling this function in order to avoid a deadlock - the child process may not be able to exit while the pipes are open.

Parameters

process

The proc_open() resource that will be closed.

Return Values

Returns the termination status of the process that was run.


User Contributed Notes
proc_close
simeonl at dbc dot co dot nz
03-Nov-2008 02:12
I have the same problem with a return code of -1 being returned because the --enable-sigchild flag is set as ashnazg at php dot net mentioned.  Unfortunely I'm told this is in the debian package, and we can't change the PHP install to fix this.

I've been able to work around this as follows, it adds an extra layer, which is not ideal, but in circumstances where you can't change the install it's better than nothing. 

I made a shell script as follows:

#!/bin/bash
eval $1
echo $? 1>&3

Basically that executes the argument of the script and echos the return code to pipe 3.  I defined pipe 3 in descriptorspec for passing the return status back to PHP, doing an end run around this "will not fix" situation.

Naturally this is no use on a windows system, but perhaps the windows package isn't compiled with the --enable-sigchild flag set?
proc_close_at_php_net at mailfilter dot com dot ar
10-Jun-2008 12:51
In response to the problem mentioned by ashnazg at php dot net about --enable-sigchild masking the real exit status, this is how I tricked it (Linux):

$descriptorspec = array(0 => array("pipe", "r"), 1 => array("pipe", "w"), 2 => array("pipe", "w"));
$cmd = "dosomethingatshell";
// My hack:
$cmd = "( $cmd ) 3>/dev/null ; echo \$? >&3";
$descriptorspec[3] = array("pipe","w");
// .... execute ....
$res = proc_open($cmd, $descriptorspec, $pipes);
if( is_resource($res) )
{
    .....
    // Get the exit status for the original command
    $status = (int) str_replace("\n","",stream_get_contents($pipes[3]));
    foreach($pipes as $pipe) fclose($pipe);
    $n = proc_close($res);
    // $n is not useful; $status has the actual exit status
    // Notice that $status is not the termination status,
    // as proc_close() should return but only the *exit* status
}
morrisdavidd at gmail dot com
04-Jun-2008 11:41
Consider the following pseudo code:

$SOME_PROCESS = proc_open(/* something here */);
...
$status = proc_get_status($SOME_PROCESS);
...
$exitCode = proc_close($SOME_PROCESS);

If the external program has exited on its own before the call to proc_get_status, then $exitCode == -1

So consider using:
$actualExitCode = ($status["running"] ? $exitCode : $status["exitcode"] );
noname at bspamfree dot org
02-Apr-2008 08:44
According to the discussion associated with bug #17538, the "termination status" as returned by this function is not the same thing as the exit code ($? in BASH). To extract the exit code from the termination status, something like this is needed:

$exitcode = (proc_close($proc) >> 8) & 0xff;
ashnazg at php dot net
05-Oct-2007 09:25
It seems that if you configured --enable-sigchild when you compiled PHP (which from my reading is required for you to use Oracle stuff), then return codes from proc_close() cannot be trusted.

Using proc_open's Example 1998's code on versions I have of PHP4 (4.4.7) and PHP5 (5.2.4), the return code is always "-1".  This is also the only return code I can cause by running other shell commands whether they succeed or fail.

I don't see this caveat mentioned anywhere except on this old bug report -- http://bugs.php.net/bug.php?id=29123
e-t172 at e-t172 dot net
18-Oct-2005 05:59
Just an improvement of my precedent function :

<?php
function proc_close_nobug($proc)
{
   
$status = proc_get_status($proc);
   
exec('kill '.$status['pid'].' 2>/dev/null >&- >/dev/null');
   
proc_close($proc);
}
?>

In fact, proc_close() works when called after "kill". This is useful because it doesn't generate "defunct processes" as the precedent version.
oohay251 at yahoo dot com
15-Sep-2005 02:06
From various Internet posts and recent experience, I have observed that you cannot rely on proc_close returning the accurate return code of the child process. The return code also depends on wether or not you read from the stdout/stderr pipes, as my example shows. I work around this by writing the exit code to an additional file descriptor.

<?
$descriptorspec
= 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
   
);
   
$proc = @proc_open("/bin/ls -l /etc/passwd", $descriptorspec, $pipes);
   
fclose($pipes[0]);
   
$output = array();
    while (!
feof($pipes[1])) array_push($output, rtrim(fgets($pipes[1],1024),"\n"));
   
fclose($pipes[1]);
    while (!
feof($pipes[2])) array_push($output, rtrim(fgets($pipes[2],1024),"\n"));
   
fclose($pipes[2]);
   
$exit=proc_close($proc);
   
print_r($output);
    echo
"exitcode $exit\n\n";

$descriptorspec = 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
   
);
   
$proc = @proc_open("/bin/ls -l /etc/passwd", $descriptorspec, $pipes);
   
fclose($pipes[0]);
   
fclose($pipes[1]);
   
fclose($pipes[2]);
   
$exit=proc_close($proc);
    echo
"exitcode $exit\n\n";

$descriptorspec = 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
      
3 => array('pipe', 'w'), // stderr is a pipe that the child will write to
   
);
   
$proc = @proc_open("/bin/ls -l /etc/passwd;echo $? >&3", $descriptorspec, $pipes);
   
fclose($pipes[0]);
   
$output = array();
   
//comment next line to get correct exicode
   
while (!feof($pipes[1])) array_push($output, rtrim(fgets($pipes[1],1024),"\n"));
   
fclose($pipes[1]);
    while (!
feof($pipes[2])) array_push($output, rtrim(fgets($pipes[2],1024),"\n"));
   
fclose($pipes[2]);
    if (!
feof($pipes[3])) $output['exitcode']=rtrim(fgets($pipes[3],5),"\n");
   
fclose($pipes[3]);
   
proc_close($proc);
   
print_r($output);
?>

Outputs on my system:

Array
(
    [0] => -rw-r--r--  1 root root 1460 2005-09-02 09:52 /etc/passwd
    [1] =>
    [2] =>
)
exitcode -1

exitcode 1

Array
(
    [0] => -rw-r--r--  1 root root 1460 2005-09-02 09:52 /etc/passwd
    [1] =>
    [2] =>
    [exitcode] => 0
)
sergey1369 at narod dot ru
29-Aug-2003 10:16
Under PHP/4.3.3RC2, in case of two processes
these function may hangs. Work around is not use
proc_close, or put it after all fcloses done.

For example, this code hangs.

$ph1 = proc_open("cat",
 array(0=>array("pipe","r"),1=>array("pipe","w")),
 $pipes1);
$ph2 = proc_open("cat",
 array(0=>array("pipe","r"),1=>array("pipe","w")),
 $pipes2);

fclose($pipes1[0]); fclose($pipes1[1]); proc_close($ph1);
fclose($pipes2[0]); fclose($pipes2[1]); proc_close($ph2);

This code worked for me:

$ph1 = proc_open("cat",
 array(0=>array("pipe","r"),1=>array("pipe","w")),
 $pipes1);
$ph2 = proc_open("cat",
 array(0=>array("pipe","r"),1=>array("pipe","w")),
 $pipes2);

fclose($pipes1[0]); fclose($pipes1[1]);
fclose($pipes2[0]); fclose($pipes2[1]);
proc_close($ph1); proc_close($ph2);
 

 
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