proc_close

(PHP 4 >= 4.3.0, PHP 5)

proc_close — Close a process opened by proc_open() and return the exit code of that process

说明

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.

参数

process: The proc_open() resource that will be closed.

返回值

Returns the termination status of the process that was run. In case of an error then -1 is returned.

注释

Note: Unix Only:

proc_close() is internally implemented using the waitpid(3) system call. To obtain the real exit status code the pcntl_wexitstatus() function should be used.

PHP手册 - N: Close a process opened by proc_open and return the exit code of that process

用户评论:

morrisdavidd at gmail dot com (05-Jun-2008 12:41)

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"] );

ashnazg at php dot net (05-Oct-2007 10:25)

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 06:59)

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 03:06)

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 11:16)

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);