|
|
|
|
Bookmark this on Delicious
Share on Facebook
 Slashdot It!
Digg  proc_close
Close a process opened by proc_open and return the exit code of that process.
(PHP 4 >= 4.3.0, PHP 5)
Code Examples / Notes » proc_closesergey1369
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($ph2); e-t172
Just an improvement of my precedent function : <?php function proc_close_nobug($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. ashnazg
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 oohay251
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 ) |
