NAME

Sys::Signals::Block - Simple interface to block delivery of signals

SYNOPSIS

  use Sys::Signals::Block qw(TERM INT);

  Sys::Signals::Block->block;
  # critical section.
  # SIGINT, SIGTERM will not be delivered
  Sys::Signals::Block->unblock;
  # signals sent during critical section will be delivered here

  # or if you prefer object syntax:
  my $sigs = Sys::Signals::Block->instance;

  $sigs->block;
  # critical section
  $sigs->unblock;

DESCRIPTION

This module provides an easy way to block the delivery of certain signals. This is essentially just a wrapper around POSIX::sigprocmask(SIG_BLOCK, ...) and POSIX::sigprocmask(SIG_UNBLOCK, ...), but with a much simpler API.

The set of signals that should be blocked are given in the import list (the parameters in the use line for the module). The signal values can be either numeric, or string names. If names are given, they may be given either with or without the SIG prefix. For example, the following are all equivalent:

 # names, no SIG prefix
 use Sys::Signals::Block qw(TERM INT);

 # names with SIG prefix
 use Sys::Signals::Block qw(SIGTERM SIGINT);

 # integers, using POSIX constants
 use Sys::Signals::Block (POSIX::SIGTERM, POSIX::SIGINT);

METHODS

All methods can be called either as class methods, or as object methods on the <Sys::Signals::Block-instance>> object.

instance()

Returns the instance of this module.

block()

Blocks the set of signals given in the use line.

unblock()

Unblocks the set of signals given in the use line. Any signals that were not delivered while signals were blocked will be delivered once the signals are unblocked.

TODO

• Add ability to change the set of signals that should be blocked at runtime.

SOURCE

You can contribute or fork this project via github:

http://github.com/mschout/sys-signals-block

 git clone git://github.com/mschout/sys-signals-block.git

BUGS

Please report any bugs or feature requests to bug-sys-signals-block@rt.cpan.org, or through the web interface at http://rt.cpan.org/.

AUTHOR

Michael Schout <mschout@cpan.org>

COPYRIGHT AND LICENSE

Copyright (C) 2009 by Michael Schout

This program is free software; you can redistribute it and/or modify it under the terms of either:

• the GNU General Public License as published by the Free Software Foundation; either version 1, or (at your option) any later version, or

• the Artistic License version 2.0.

SEE ALSO

"SigSet" in POSIX, "sigprocmask" in POSIX