PHP Manual
Ev
The EvChild class

The EvChild class

(PECL ev >= 0.2.0)

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

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 createStopped(
     int $pid ,
     bool $trace ,
     callable $callback ,
     mixed $data = ?,
     int $priority = ?
): object

public set( int $pid , bool $trace ): void

/* Inherited methods */

public EvWatcher::clear(): int

public EvWatcher::feed( int $revents ): void

public EvWatcher::getLoop(): EvLoop

public EvWatcher::invoke( int $revents ): void

public EvWatcher::keepalive( bool $value = ?): bool

public EvWatcher::setCallback( callable $callback ): void

public EvWatcher::start(): void

public EvWatcher::stop(): void

}

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 .