(PECL ev >= 0.2.0)
EvSignal watchers will trigger an event when the process receives a specific signal one or more times. Even though signals are very asynchronous, libev will try its best to deliver signals synchronously, i.e. as part of the normal event processing, like any other event.
There is no limit for the number of watchers for the same signal, but only within the same loop, i.e. one can watch for
SIGINT in the default loop and for
SIGIO in another loop, but it is not allowed to watch for
SIGINT in both the default loop and another loop at the same time. At the moment,
SIGCHLD is permanently tied to the default loop.
If possible and supported, libev will install its handlers with
SA_RESTART (or equivalent) behaviour enabled, so system calls should not be unduly interrupted. In case of a problem with system calls getting interrupted by signals, all the signals can be blocked in an EvCheck watcher and unblocked in a EvPrepare watcher.
public __construct ( int $signum , callable $callback [, mixed $data = null [, int $priority = 0 ]] )
final public static createStopped ( int $signum , callable $callback [, mixed $data = null [, int $priority = 0 ]] ) : EvSignal
public set ( int $signum ) : void
public EvWatcher::clear ( ) : int
abstract public EvWatcher::__construct ( )
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}
Signal number. See the constants exported by pcntl extension. See also
signal(7) man page.
© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.