errno(3pm) [osx man page]

Errno(3pm)						 Perl Programmers Reference Guide						Errno(3pm)

NAME

       Errno - System errno constants

SYNOPSIS

	   use Errno qw(EINTR EIO :POSIX);

DESCRIPTION

       "Errno" defines and conditionally exports all the error constants defined in your system "errno.h" include file. It has a single export
       tag, ":POSIX", which will export all POSIX defined error numbers.

       "Errno" also makes "%!" magic such that each element of "%!" has a non-zero value only if $! is set to that value. For example:

	   use Errno;

	   unless (open(FH, "/fangorn/spouse")) {
	       if ($!{ENOENT}) {
		   warn "Get a wife!
";
	       } else {
		   warn "This path is barred: $!";
	       }
	   }

       If a specified constant "EFOO" does not exist on the system, $!{EFOO} returns "".  You may use "exists $!{EFOO}" to check whether the
       constant is available on the system.

CAVEATS

       Importing a particular constant may not be very portable, because the import will fail on platforms that do not have that constant.  A more
       portable way to set $! to a valid value is to use:

	   if (exists &Errno::EFOO) {
	       $! = &Errno::EFOO;
	   }

AUTHOR

       Graham Barr <gbarr@pobox.com>

COPYRIGHT

       Copyright (c) 1997-8 Graham Barr. All rights reserved.  This program is free software; you can redistribute it and/or modify it under the
       same terms as Perl itself.

perl v5.16.2							    2013-08-25								Errno(3pm)

IO::Poll(3pm)						 Perl Programmers Reference Guide					     IO::Poll(3pm)

NAME

       IO::Poll - Object interface to system poll call

SYNOPSIS

	   use IO::Poll qw(POLLRDNORM POLLWRNORM POLLIN POLLHUP);

	   $poll = IO::Poll->new();

	   $poll->mask($input_handle => POLLIN);
	   $poll->mask($output_handle => POLLOUT);

	   $poll->poll($timeout);

	   $ev = $poll->events($input);

DESCRIPTION

       "IO::Poll" is a simple interface to the system level poll routine.

METHODS

       mask ( IO [, EVENT_MASK ] )
	   If EVENT_MASK is given, then, if EVENT_MASK is non-zero, IO is added to the list of file descriptors and the next call to poll will
	   check for any event specified in EVENT_MASK. If EVENT_MASK is zero then IO will be removed from the list of file descriptors.

	   If EVENT_MASK is not given then the return value will be the current event mask value for IO.

       poll ( [ TIMEOUT ] )
	   Call the system level poll routine. If TIMEOUT is not specified then the call will block. Returns the number of handles which had
	   events happen, or -1 on error.

       events ( IO )
	   Returns the event mask which represents the events that happened on IO during the last call to "poll".

       remove ( IO )
	   Remove IO from the list of file descriptors for the next poll.

       handles( [ EVENT_MASK ] )
	   Returns a list of handles. If EVENT_MASK is not given then a list of all handles known will be returned. If EVENT_MASK is given then a
	   list of handles will be returned which had one of the events specified by EVENT_MASK happen during the last call ti "poll"

SEE ALSO

       poll(2), IO::Handle, IO::Select

AUTHOR

       Graham Barr. Currently maintained by the Perl Porters.  Please report all bugs to <perlbug@perl.org>.

COPYRIGHT

       Copyright (c) 1997-8 Graham Barr <gbarr@pobox.com>. All rights reserved.  This program is free software; you can redistribute it and/or
       modify it under the same terms as Perl itself.

perl v5.16.3							    2013-03-04							     IO::Poll(3pm)