NAME

POSIX::SigAction - represent a struct sigaction

SYNOPSIS

$sigset    = POSIX::SigSet->new(SIGINT, SIGQUIT);
$sigaction = POSIX::SigAction
   ->new(\&handler, $sigset, SA_NOCLDSTOP);

$sigset    = $sigaction->mask;
$sigaction->flags(SA_RESTART);
$sigaction->safe(1);

DESCRIPTION

The POSIX::SigAction object corresponds to the C struct sigaction, defined by signal.h.

This module is a bit tricky: POSIX.pm contains the same code for the POSIX::SigAction namespace. However, we do not need POSIX.pm but only the POSIX.xs component which has the namespace hard-coded.

METHODS

Constructors

POSIX::SigAction->new( $handler, [$sigset, [$flags]] )

The first parameter is the handler, a code reference. The second parameter is a POSIX::SigSet object, it defaults to the empty set. The third parameter contains the sa_flags, it defaults to 0.

This object will be destroyed automatically when it is no longer needed.

Accessors

$obj->flags()

Accessor functions to get/set the values of a SigAction object.

$obj->handler()

$obj->mask()

$obj->safe()

Accessor function for the "safe signals" flag of a SigAction object; see perlipc for general information on safe (a.k.a. "deferred") signals. If you wish to handle a signal safely, use this accessor to set the "safe" flag in the POSIX::SigAction object:

$sigaction->safe(1);

You may also examine the "safe" flag on the output action object which is filled in when given as the third parameter to POSIX::1003::Signals::sigaction():

sigaction(SIGINT, $new_action, $old_action);
if ($old_action->safe) {
   # previous SIGINT handler used safe signals
}

SEE ALSO

This module is part of POSIX-1003 distribution version 1.02, built on November 10, 2020. Website: http://perl.overmeer.net/CPAN. The code is based on POSIX, which is released with Perl itself. See also POSIX::Util for additional functionality.

COPYRIGHTS

Copyrights 2011-2020 on the perl code and the related documentation by [Mark Overmeer]. For other contributors see ChangeLog.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See http://dev.perl.org/licenses/