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Bug #64465 proc_get_status update time when using proc_terminate
Submitted: 2013-03-20 15:32 UTC Modified: 2013-03-20 19:20 UTC
From: andrey dot kalinovsky at gmail dot com Assigned:
Status: Not a bug Package: Program Execution
PHP Version: Irrelevant OS: OSX, Ubuntu
Private report: No CVE-ID: None
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From: andrey dot kalinovsky at gmail dot com
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 [2013-03-20 15:32 UTC] andrey dot kalinovsky at gmail dot com 
Description:
------------
After proc_terminate has been called, there is a time during which proc_get_status 
will still describe the child process as running. 

Test script:
---------------
<?php

$descriptorspec = array(
                        0 => array("pipe", "r"),
                        1 => array("pipe", "w"),
                        2 => array("pipe", "w")
                        );

$process = proc_open("sleep 20", $descriptorspec, $pipes);
var_dump(proc_get_status($process));
proc_terminate($process);
var_dump(proc_get_status($process));
sleep(1);
var_dump(proc_get_status($process));

Expected result:
----------------
array(8) {
  'command' =>
  string(8) "sleep 20"
  'pid' =>
  int(14027)
  'running' =>
  bool(true)
  'signaled' =>
  bool(false)
  'stopped' =>
  bool(false)
  'exitcode' =>
  int(-1)
  'termsig' =>
  int(0)
  'stopsig' =>
  int(0)
}
array(8) {
  'command' =>
  string(8) "sleep 20"
  'pid' =>
  int(14027)
  'running' =>
  bool(false)
  'signaled' =>
  bool(true)
  'stopped' =>
  bool(false)
  'exitcode' =>
  int(-1)
  'termsig' =>
  int(15)
  'stopsig' =>
  int(0)
}
array(8) {
  'command' =>
  string(8) "sleep 20"
  'pid' =>
  int(14027)
  'running' =>
  bool(false)
  'signaled' =>
  bool(true)
  'stopped' =>
  bool(false)
  'exitcode' =>
  int(-1)
  'termsig' =>
  int(15)
  'stopsig' =>
  int(0)
}

Actual result:
--------------
array(8) {
  'command' =>
  string(8) "sleep 20"
  'pid' =>
  int(14027)
  'running' =>
  bool(true)
  'signaled' =>
  bool(false)
  'stopped' =>
  bool(false)
  'exitcode' =>
  int(-1)
  'termsig' =>
  int(0)
  'stopsig' =>
  int(0)
}
array(8) {
  'command' =>
  string(8) "sleep 20"
  'pid' =>
  int(14027)
  'running' =>
  bool(true)
  'signaled' =>
  bool(false)
  'stopped' =>
  bool(false)
  'exitcode' =>
  int(-1)
  'termsig' =>
  int(0)
  'stopsig' =>
  int(0)
}
array(8) {
  'command' =>
  string(8) "sleep 20"
  'pid' =>
  int(14027)
  'running' =>
  bool(false)
  'signaled' =>
  bool(true)
  'stopped' =>
  bool(false)
  'exitcode' =>
  int(-1)
  'termsig' =>
  int(15)
  'stopsig' =>
  int(0)
}

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 [2013-03-20 15:56 UTC] andrey dot kalinovsky at gmail dot com 
This is a big issue when working with libev eventloop, since it's about handling 
child processes asynchronously. So, I can't just let the sleep(1) here, the 
solution must be asynchronous...
 [2013-03-20 19:16 UTC] aharvey@php.net
-Status: Open +Status: Not a bug
 [2013-03-20 19:16 UTC] aharvey@php.net 
proc_terminate() is documented as being asynchronous in the manual — all it 
really does internally is to call kill(), which simply sends a signal. 
pcntl_waitpid() is presumably what you need to call after proc_terminate(), if 
you don't want to poll with proc_get_status().
 [2013-03-20 19:20 UTC] andrey dot kalinovsky at gmail dot com 
Thank you for your input. But pcntl_waitpid is blocking, so I cannot use it. Are 
there any other ways by any chance ?
 
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