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proc_terminate

(PHP 5, PHP 7)

proc_terminate杀除由 proc_open 打开的进程

说明

proc_terminate ( resource $process [, int $signal = 15 ] ) : bool

process (由 proc_open() 函数创建) 发送信号通知其终止。 proc_terminate() 调用之后将会立即返回, 而不会等待进程终止。

可以使用 proc_terminate() 终止进程 并且继续其他的任务。 可以使用 proc_get_status() 函数来检查进程是否已经终止。

参数

process

proc_open() 打开的 resource

signal

可选参数,仅用于 POSIX 操作系统。 表示调用系统命令 kill(2) 来向进程发送的信号。 默认值为 SIGTERM

返回值

返回进程的终止状态。

更新日志

版本 说明
5.2.2 之前的版本被用来销毁进程 resource

参见

  • proc_open() - 执行一个命令,并且打开用来输入/输出的文件指针。
  • proc_close() - 关闭由 proc_open 打开的进程并且返回进程退出码
  • proc_get_status() - 获取由 proc_open 函数打开的进程的信息

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User Contributed Notes 3 notes

up
14
csh dot spam at me dot com
6 years ago
/bin/sh -c CMD will fork sh and then exec CMD.
/bin/sh -c exec CMD will NOT fork and only executes CMD.

Therefore, you can get rid of this hack by prefixing your command to "exec bla bla bla".
up
21
jerhee at ucsd dot edu
11 years ago
As explained in http://bugs.php.net/bug.php?id=39992, proc_terminate() leaves children of the child process running. In my application, these children often have infinite loops, so I need a sure way to kill processes created with proc_open(). When I call proc_terminate(), the /bin/sh process is killed, but the child with the infinite loop is left running.

Until proc_terminate() gets fixed, I would not recommend using it. Instead, my solution is to:
1) call proc_get_status() to get the parent pid (ppid) of the process I want to kill.
2) use ps to get all pids that have that ppid as their parent pid
3) use posix_kill() to send the SIGKILL (9) signal to each of those child pids
4) call proc_close() on process resource

<?php
$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 the child will write to
);
$process = proc_open('bad_program', $descriptorspec, $pipes);
if(!
is_resource($process)) {
    throw new
Exception('bad_program could not be started.');
}
//pass some input to the program
fwrite($pipes[0], $lots_of_data);
//close stdin. By closing stdin, the program should exit
//after it finishes processing the input
fclose($pipes[0]);

//do some other stuff ... the process will probably still be running
//if we check on it right away

$status = proc_get_status($process);
if(
$status['running'] == true) { //process ran too long, kill it
    //close all pipes that are still open
   
fclose($pipes[1]); //stdout
   
fclose($pipes[2]); //stderr
    //get the parent pid of the process we want to kill
   
$ppid = $status['pid'];
   
//use ps to get all the children of this process, and kill them
   
$pids = preg_split('/\s+/', `ps -o pid --no-heading --ppid $ppid`);
    foreach(
$pids as $pid) {
        if(
is_numeric($pid)) {
            echo
"Killing $pid\n";
           
posix_kill($pid, 9); //9 is the SIGKILL signal
       
}
    }
       
   
proc_close($process);
}

?>
up
4
v dot denegin at yahoo dot com
5 years ago
on Windows platform proc_terminate() does not kill sub-processes that are not handling kill signals. It happens even if you call xxx.exe and call proc_terminate() the process will remain active.

The solution is instead of calling proc_terminate() is to call the user-defined kill() function (already win/unix optimized)
After that need to close all pipes and execute proc_close().

function kill($pid){
    return stripos(php_uname('s'), 'win')>-1  ? exec("taskkill /F /T /PID $pid") : exec("kill -9 $pid");
}

function killall($pids) {
    $os=stripos(php_uname('s'), 'win')>-1;
    ($_=implode($os?' /PID ':' ',$pids)) or ($_=$pids);
    return preg_match('/success|close/', $os ? exec("taskkill /F /T /PID $_") : exec("kill -9 $_"));
}

Example:

$pstatus = proc_get_status($resource);
$PID = $pstatus['pid'];

// other commands

kill($PID); // instead of proc_terminate($resource);
fclose($pipes[0]);
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($resource);
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