PCNTL Functions
PHP Manual

pcntl_sigprocmask

Sets and retrieves blocked signals

Description

bool pcntl_sigprocmask(int $mode, array $signals, array &$old_signals = null)

The pcntl_sigprocmask function adds, removes or sets blocked signals, depending on the mode parameter.

Parameters

mode

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.

signals

List of signals.

old_signals

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

Return Values

Returns true on success or false on failure.

Examples

Example #1 pcntl_sigprocmask example

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

See Also

  • pcntl_sigwaitinfo
  • pcntl_sigtimedwait