passthru
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"] );
proc_close
(PHP 4 >= 4.3.0, PHP 5)
proc_close — Cierra un proceso abierto mediante proc_open() y devuelve el códido de salida de tal proceso
Descripción
int proc_close
( resource $process
)
proc_close() es similar a pclose() excepto que este solo funciona con procesos abiertos mediante proc_open(). proc_close() espera para la terminación del proceso, y devuelve su código de salida. Si se han abierto tuberias para este proceso, se deberia usar fclose() antes de la llamada a esta función para evitar un punto muerto - es decir, los procesos hijos no seran capaces de salir mientras que las tuberias estan abiertas.
Valores devueltos
Devuelve el estado de terminación del proceso que se ejecutó. En caso de error se devolverá -1.
Notas
Note: Solo Unix:
proc_close() se implementa internamente usando la llamada al sistema waitpid(3). Para obtener el código de estado de salida real, se deberia usar la función pcntl_wexitstatus().
add a note
User Contributed Notes
proc_close
morrisdavidd at gmail dot com
04-Jun-2008 11:41
ashnazg at php dot net
05-Oct-2007 09:25
It seems that if you configured --enable-sigchild when you compiled PHP (which from my reading is required for you to use Oracle stuff), then return codes from proc_close() cannot be trusted.
Using proc_open's Example 1998's code on versions I have of PHP4 (4.4.7) and PHP5 (5.2.4), the return code is always "-1". This is also the only return code I can cause by running other shell commands whether they succeed or fail.
I don't see this caveat mentioned anywhere except on this old bug report -- http://bugs.php.net/bug.php?id=29123
e-t172 at e-t172 dot net
18-Oct-2005 05:59
Just an improvement of my precedent function :
<?php
function proc_close_nobug($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);