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Diffstat (limited to 'Master/tlpkg/tlperl.old/lib/IO/Select.pm')
-rw-r--r-- | Master/tlpkg/tlperl.old/lib/IO/Select.pm | 381 |
1 files changed, 0 insertions, 381 deletions
diff --git a/Master/tlpkg/tlperl.old/lib/IO/Select.pm b/Master/tlpkg/tlperl.old/lib/IO/Select.pm deleted file mode 100644 index fc05fe70e9c..00000000000 --- a/Master/tlpkg/tlperl.old/lib/IO/Select.pm +++ /dev/null @@ -1,381 +0,0 @@ -# IO::Select.pm -# -# 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. - -package IO::Select; - -use strict; -use warnings::register; -use vars qw($VERSION @ISA); -require Exporter; - -$VERSION = "1.17"; - -@ISA = qw(Exporter); # This is only so we can do version checking - -sub VEC_BITS () {0} -sub FD_COUNT () {1} -sub FIRST_FD () {2} - -sub new -{ - my $self = shift; - my $type = ref($self) || $self; - - my $vec = bless [undef,0], $type; - - $vec->add(@_) - if @_; - - $vec; -} - -sub add -{ - shift->_update('add', @_); -} - - -sub remove -{ - shift->_update('remove', @_); -} - - -sub exists -{ - my $vec = shift; - my $fno = $vec->_fileno(shift); - return undef unless defined $fno; - $vec->[$fno + FIRST_FD]; -} - - -sub _fileno -{ - my($self, $f) = @_; - return unless defined $f; - $f = $f->[0] if ref($f) eq 'ARRAY'; - ($f =~ /^\d+$/) ? $f : fileno($f); -} - -sub _update -{ - my $vec = shift; - my $add = shift eq 'add'; - - my $bits = $vec->[VEC_BITS]; - $bits = '' unless defined $bits; - - my $count = 0; - my $f; - foreach $f (@_) - { - my $fn = $vec->_fileno($f); - next unless defined $fn; - my $i = $fn + FIRST_FD; - if ($add) { - if (defined $vec->[$i]) { - $vec->[$i] = $f; # if array rest might be different, so we update - next; - } - $vec->[FD_COUNT]++; - vec($bits, $fn, 1) = 1; - $vec->[$i] = $f; - } else { # remove - next unless defined $vec->[$i]; - $vec->[FD_COUNT]--; - vec($bits, $fn, 1) = 0; - $vec->[$i] = undef; - } - $count++; - } - $vec->[VEC_BITS] = $vec->[FD_COUNT] ? $bits : undef; - $count; -} - -sub can_read -{ - my $vec = shift; - my $timeout = shift; - my $r = $vec->[VEC_BITS]; - - defined($r) && (select($r,undef,undef,$timeout) > 0) - ? handles($vec, $r) - : (); -} - -sub can_write -{ - my $vec = shift; - my $timeout = shift; - my $w = $vec->[VEC_BITS]; - - defined($w) && (select(undef,$w,undef,$timeout) > 0) - ? handles($vec, $w) - : (); -} - -sub has_exception -{ - my $vec = shift; - my $timeout = shift; - my $e = $vec->[VEC_BITS]; - - defined($e) && (select(undef,undef,$e,$timeout) > 0) - ? handles($vec, $e) - : (); -} - -sub has_error -{ - warnings::warn("Call to deprecated method 'has_error', use 'has_exception'") - if warnings::enabled(); - goto &has_exception; -} - -sub count -{ - my $vec = shift; - $vec->[FD_COUNT]; -} - -sub bits -{ - my $vec = shift; - $vec->[VEC_BITS]; -} - -sub as_string # for debugging -{ - my $vec = shift; - my $str = ref($vec) . ": "; - my $bits = $vec->bits; - my $count = $vec->count; - $str .= defined($bits) ? unpack("b*", $bits) : "undef"; - $str .= " $count"; - my @handles = @$vec; - splice(@handles, 0, FIRST_FD); - for (@handles) { - $str .= " " . (defined($_) ? "$_" : "-"); - } - $str; -} - -sub _max -{ - my($a,$b,$c) = @_; - $a > $b - ? $a > $c - ? $a - : $c - : $b > $c - ? $b - : $c; -} - -sub select -{ - shift - if defined $_[0] && !ref($_[0]); - - my($r,$w,$e,$t) = @_; - my @result = (); - - my $rb = defined $r ? $r->[VEC_BITS] : undef; - my $wb = defined $w ? $w->[VEC_BITS] : undef; - my $eb = defined $e ? $e->[VEC_BITS] : undef; - - if(select($rb,$wb,$eb,$t) > 0) - { - my @r = (); - my @w = (); - my @e = (); - my $i = _max(defined $r ? scalar(@$r)-1 : 0, - defined $w ? scalar(@$w)-1 : 0, - defined $e ? scalar(@$e)-1 : 0); - - for( ; $i >= FIRST_FD ; $i--) - { - my $j = $i - FIRST_FD; - push(@r, $r->[$i]) - if defined $rb && defined $r->[$i] && vec($rb, $j, 1); - push(@w, $w->[$i]) - if defined $wb && defined $w->[$i] && vec($wb, $j, 1); - push(@e, $e->[$i]) - if defined $eb && defined $e->[$i] && vec($eb, $j, 1); - } - - @result = (\@r, \@w, \@e); - } - @result; -} - - -sub handles -{ - my $vec = shift; - my $bits = shift; - my @h = (); - my $i; - my $max = scalar(@$vec) - 1; - - for ($i = FIRST_FD; $i <= $max; $i++) - { - next unless defined $vec->[$i]; - push(@h, $vec->[$i]) - if !defined($bits) || vec($bits, $i - FIRST_FD, 1); - } - - @h; -} - -1; -__END__ - -=head1 NAME - -IO::Select - OO interface to the select system call - -=head1 SYNOPSIS - - use IO::Select; - - $s = IO::Select->new(); - - $s->add(\*STDIN); - $s->add($some_handle); - - @ready = $s->can_read($timeout); - - @ready = IO::Select->new(@handles)->can_read(0); - -=head1 DESCRIPTION - -The C<IO::Select> package implements an object approach to the system C<select> -function call. It allows the user to see what IO handles, see L<IO::Handle>, -are ready for reading, writing or have an exception pending. - -=head1 CONSTRUCTOR - -=over 4 - -=item new ( [ HANDLES ] ) - -The constructor creates a new object and optionally initialises it with a set -of handles. - -=back - -=head1 METHODS - -=over 4 - -=item add ( HANDLES ) - -Add the list of handles to the C<IO::Select> object. It is these values that -will be returned when an event occurs. C<IO::Select> keeps these values in a -cache which is indexed by the C<fileno> of the handle, so if more than one -handle with the same C<fileno> is specified then only the last one is cached. - -Each handle can be an C<IO::Handle> object, an integer or an array -reference where the first element is an C<IO::Handle> or an integer. - -=item remove ( HANDLES ) - -Remove all the given handles from the object. This method also works -by the C<fileno> of the handles. So the exact handles that were added -need not be passed, just handles that have an equivalent C<fileno> - -=item exists ( HANDLE ) - -Returns a true value (actually the handle itself) if it is present. -Returns undef otherwise. - -=item handles - -Return an array of all registered handles. - -=item can_read ( [ TIMEOUT ] ) - -Return an array of handles that are ready for reading. C<TIMEOUT> is -the maximum amount of time to wait before returning an empty list, in -seconds, possibly fractional. If C<TIMEOUT> is not given and any -handles are registered then the call will block. - -=item can_write ( [ TIMEOUT ] ) - -Same as C<can_read> except check for handles that can be written to. - -=item has_exception ( [ TIMEOUT ] ) - -Same as C<can_read> except check for handles that have an exception -condition, for example pending out-of-band data. - -=item count () - -Returns the number of handles that the object will check for when -one of the C<can_> methods is called or the object is passed to -the C<select> static method. - -=item bits() - -Return the bit string suitable as argument to the core select() call. - -=item select ( READ, WRITE, EXCEPTION [, TIMEOUT ] ) - -C<select> is a static method, that is you call it with the package name -like C<new>. C<READ>, C<WRITE> and C<EXCEPTION> are either C<undef> or -C<IO::Select> objects. C<TIMEOUT> is optional and has the same effect as -for the core select call. - -The result will be an array of 3 elements, each a reference to an array -which will hold the handles that are ready for reading, writing and have -exceptions respectively. Upon error an empty list is returned. - -=back - -=head1 EXAMPLE - -Here is a short example which shows how C<IO::Select> could be used -to write a server which communicates with several sockets while also -listening for more connections on a listen socket - - use IO::Select; - use IO::Socket; - - $lsn = new IO::Socket::INET(Listen => 1, LocalPort => 8080); - $sel = new IO::Select( $lsn ); - - while(@ready = $sel->can_read) { - foreach $fh (@ready) { - if($fh == $lsn) { - # Create a new socket - $new = $lsn->accept; - $sel->add($new); - } - else { - # Process socket - - # Maybe we have finished with the socket - $sel->remove($fh); - $fh->close; - } - } - } - -=head1 AUTHOR - -Graham Barr. Currently maintained by the Perl Porters. Please report all -bugs to <perl5-porters@perl.org>. - -=head1 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. - -=cut - |