Ev
PHP Manual

The EvChild class

Introduction

EvChild watchers trigger when the process receives a SIGCHLD in response to some child status changes (most typically when a child dies or exits). It is permissible to install an EvChild watcher after the child has been forked(which implies it might have already exited), as long as the event loop isn't entered(or is continued from a watcher), i.e. forking and then immediately registering a watcher for the child is fine, but forking and registering a watcher a few event loop iterations later or in the next callback invocation is not.

It is allowed to register EvChild watchers in the default loop only.

Class synopsis

EvChild
class EvChild extends EvWatcher {
/* Properties */
public $pid;
public $rpid;
public $rstatus;
/* Inherited properties */
public $is_active;
public $data;
public $is_pending;
public $priority;
/* Methods */
public __construct(
     int $pid ,
     bool $trace ,
     callable $callback ,
     mixed $data = null ,
     int $priority = 0
)
final public static object createStopped(
     int $pid ,
     bool $trace ,
     callable $callback ,
     mixed $data = ?,
     int $priority = ?
)
public void set( int $pid , bool $trace )
/* Inherited methods */
public int EvWatcher::clear()
public void EvWatcher::feed( int $revents )
public EvLoop EvWatcher::getLoop()
public void EvWatcher::invoke( int $revents )
public bool EvWatcher::keepalive( bool $value = ?)
public void EvWatcher::setCallback( callable $callback )
public void EvWatcher::start()
public void EvWatcher::stop()
}

Properties

pid

Readonly . The process ID this watcher watches out for, or 0 , meaning any process ID.

rpid

Readonly .The process ID that detected a status change.

rstatus

Readonly . The process exit status caused by rpid .

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