proc_close

(PHP 4 >= 4.3.0, PHP 5)

proc_closeSchließt einen Prozess, der mit proc_open() gestartet wurde und gibt den Exitcode dieses Prozesses zurück

Beschreibung

int proc_close ( resource $process )

proc_close() entspricht pclose(), außer dass Die Funktion nur mit Prozessen arbeitet, die von proc_open() gestartet wurden. proc_close() wartet auf den zu beendenden Prozess und gibt seinen Exitcode zurück. Wenn Sie offene Pipes zu diesem Prozess haben, sollten Sie zuvor fclose() ausführen, um Deadlocks vorzubeugen - der Child-Prozess kann sich nicht beenden, solange noch Pipes geöffnet sind.

Parameter-Liste

process

Die zu schließende proc_open()-Ressource.

Rückgabewerte

Gibt den Termination-Status des gelaufenen Prozesses zurück. Falls ein Fehler auftritt wird -1 zurückgegeben.

Anmerkungen

Hinweis: Nur unter Unix:

proc_close() ist intern durch einen waitpid(3) Aufruf implementiert. Um den wirklichen Rückgabewert zu erhalten, sollte die pcntl_wexitstatus() Funktion verwendet werden.

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User Contributed Notes 4 notes

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1
oohay251 at yahoo dot com
8 years ago
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
)
up
0
ashnazg at php dot net
6 years ago
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
up
0
sergey1369 at narod dot ru
10 years ago
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);
up
-1
morrisdavidd at gmail dot com
5 years ago
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"] );
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