Introduction

EvStat monitors a file system path for attribute changes. It calls stat() on that path in regular intervals(or when the OS signals it changed) and sees if it changed compared to the last time, invoking the callback if it did.

The path does not need to exist: changing from "path exists" to "path does not exist" is a status change like any other. The condition "path does not exist" is signified by the 'nlink' item being 0(returned by EvStat::attr() method).

The path must not end in a slash or contain special components such as '.' or .. . The path should be absolute: if it is relative and the working directory changes, then the behaviour is undefined.

Since there is no portable change notification interface available, the portable implementation simply calls stat() regularly on the path to see if it changed somehow. For this case a recommended polling interval can be specified. If one specifies a polling interval of 0.0 (highly recommended) then a suitable, unspecified default value will be used(which could be expected to be around 5 seconds, although this might change dynamically). libev will also impose a minimum interval which is currently around 0.1 , but that’s usually overkill.

This watcher type is not meant for massive numbers of EvStat watchers, as even with OS-supported change notifications, this can be resource-intensive.

Class synopsis

EvStat extends EvWatcher {

/* Properties */

public $path ;

public $interval ;

/* Inherited properties */

public $is_active ;

public $data ;

public $is_pending ;

public $priority ;

/* Methods */

public array attr ( void )

public __construct ( string $path , double $interval , callable $callback [, mixed $data = NULL [, int $priority = 0 ]] )

final public static void createStopped ( string $path , double $interval , callable $callback [, mixed $data = NULL [, int $priority = 0 ]] )

public void prev ( void )

public void set ( string $path , double $interval )

public bool stat ( void )

/* Inherited methods */

public int EvWatcher::clear ( void )

abstract public EvWatcher::__construct ( void )

public void EvWatcher::feed ( int $revents )

public EvLoop EvWatcher::getLoop ( void )

public void EvWatcher::invoke ( int $revents )

public bool EvWatcher::keepalive ([ bool $value ] )

public void EvWatcher::setCallback ( callable $callback )

public void EvWatcher::start ( void )

public void EvWatcher::stop ( void )

}

Properties

interval: Readonly . Hint on how quickly a change is expected to be detected and should normally be specified as 0.0 to let libev choose a suitable value.
path: Readonly . The path to wait for status changes on.

EvStat::attr — Returns the values most recently detected by Ev
EvStat::__construct — Constructs EvStat watcher object
EvStat::createStopped — Create a stopped EvStat watcher object
EvStat::prev — Returns the previous set of values returned by EvStat::attr
EvStat::set — Configures the watcher
EvStat::stat — Initiates the stat call

EvSignal::set

EvStat::attr

PHP Manual

The EvStat class

Introduction

Class synopsis

Properties

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