pcntl_sigprocmask

(PHP 5 >= 5.3.0, PHP 7)

Sets and retrieves blocked signals

bool pcntl_sigprocmask ( int $how, array $set [, array &$oldset ] )

The pcntl_sigprocmask() function adds, removes or sets blocked signals, depending on the how parameter.

Parameters:

how

Sets the behavior of pcntl_sigprocmask(). Possible values:

SIG_BLOCK: Add the signals to the currently blocked signals.
SIG_UNBLOCK: Remove the signals from the currently blocked signals.
SIG_SETMASK: Replace the currently blocked signals by the given list of signals.

set

List of signals.

oldset

The oldset parameter is set to an array containing the list of the previously blocked signals.

Returns:

Returns TRUE on success or FALSE on failure.

Examples:

pcntl_sigprocmask() example

<?php
pcntl_sigprocmask(SIG_BLOCK, array(SIGHUP));
$oldset = array();
pcntl_sigprocmask(SIG_UNBLOCK, array(SIGHUP), $oldset);
?>