Linux::FD::Signal - Signal filehandles for Linux
version 0.016
use Linux::FD::Signal; my $fh = Linux::FD::Signal->new($sigset, @flags);
This module creates a filehandle that can be used to accept signals targetted at the caller, similar but not identical to Signal::Pipe. It provides an alternative to conventional signal handlers or sigwaitinfo, with the advantage that the file descriptor may easily be monitored by mechanisms such as select, poll, and epoll.
sigwaitinfo
select
poll
epoll
The $sigmask argument specifies the set of signals that the caller wishes to accept via the file descriptor. This should either be a signal name(without the SIG prefix) or a POSIX::SigSet object. Normally, the set of signals to be received via the file descriptor should be blocked to prevent the signals being handled according to their default dispositions. It is not possible to receive SIGKILL or SIGSTOP signals via a signalfd file descriptor; these signals are silently ignored if specified in $sigmask. @flags is an optional list of flags, currently limited to 'non-blocking' (requires Linux 2.6.27).
SIG
@flags
'non-blocking'
Sets the signal mask to a new value. Its argument works exactly the same as new's
new
If one or more of the signals specified in mask is pending for the process, then it returns the information of one signalfd_siginfo structures (see below) that describe the signals.
As a consequence of the receive, the signals are consumed, so that they are no longer pending for the process (i.e., will not be caught by signal handlers, and cannot be accepted using sigwaitinfo).
If none of the signals in mask is pending for the process, then the receive either blocks until one of the signals in mask is generated for the process, or fails with the error EAGAIN if the file descriptor has been made non-blocking.
EAGAIN
The information is returned as a hashref with the following keys: signo, errno, code, pid, uid, fd, tid, band, overrun, trapno, status, int, ptr, utime, stime, address. All of these are returned as integers. Some of them are only useful in certain circumstances, others may not be useful from perl at all.
signo
errno
code
pid
uid
fd
tid
band
overrun
trapno
status
int
ptr
utime
stime
address
Signal::Mask
Leon Timmermans <leont@cpan.org>
This software is copyright (c) 2010 by Leon Timmermans.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
To install Linux::FD, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Linux::FD
CPAN shell
perl -MCPAN -e shell install Linux::FD
For more information on module installation, please visit the detailed CPAN module installation guide.