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1 | |
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2 | # IO::Poll.pm |
3 | # |
4 | # Copyright (c) 1997-8 Graham Barr <gbarr@pobox.com>. All rights reserved. |
5 | # This program is free software; you can redistribute it and/or |
6 | # modify it under the same terms as Perl itself. |
7 | |
8 | package IO::Poll; |
9 | |
10 | use strict; |
11 | use IO::Handle; |
12 | use Exporter (); |
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13 | our(@ISA, @EXPORT_OK, @EXPORT, $VERSION); |
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14 | |
15 | @ISA = qw(Exporter); |
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16 | $VERSION = "0.05"; |
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17 | |
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18 | @EXPORT = qw( POLLIN |
19 | POLLOUT |
20 | POLLERR |
21 | POLLHUP |
22 | POLLNVAL |
23 | ); |
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24 | |
25 | @EXPORT_OK = qw( |
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26 | POLLPRI |
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27 | POLLRDNORM |
28 | POLLWRNORM |
29 | POLLRDBAND |
30 | POLLWRBAND |
31 | POLLNORM |
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32 | ); |
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33 | |
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34 | # [0] maps fd's to requested masks |
35 | # [1] maps fd's to returned masks |
36 | # [2] maps fd's to handles |
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37 | sub new { |
38 | my $class = shift; |
39 | |
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40 | my $self = bless [{},{},{}], $class; |
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41 | |
42 | $self; |
43 | } |
44 | |
45 | sub mask { |
46 | my $self = shift; |
47 | my $io = shift; |
48 | my $fd = fileno($io); |
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49 | if (@_) { |
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50 | my $mask = shift; |
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51 | if($mask) { |
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52 | $self->[0]{$fd}{$io} = $mask; # the error events are always returned |
53 | $self->[1]{$fd} = 0; # output mask |
54 | $self->[2]{$io} = $io; # remember handle |
55 | } else { |
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56 | delete $self->[0]{$fd}{$io}; |
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57 | delete $self->[1]{$fd} unless %{$self->[0]{$fd}}; |
58 | delete $self->[2]{$io}; |
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59 | } |
60 | } |
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61 | |
62 | return unless exists $self->[0]{$fd} and exists $self->[0]{$fd}{$io}; |
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63 | return $self->[0]{$fd}{$io}; |
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64 | } |
65 | |
66 | |
67 | sub poll { |
68 | my($self,$timeout) = @_; |
69 | |
70 | $self->[1] = {}; |
71 | |
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72 | my($fd,$mask,$iom); |
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73 | my @poll = (); |
74 | |
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75 | while(($fd,$iom) = each %{$self->[0]}) { |
76 | $mask = 0; |
77 | $mask |= $_ for values(%$iom); |
78 | push(@poll,$fd => $mask); |
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79 | } |
80 | |
81 | my $ret = @poll ? _poll(defined($timeout) ? $timeout * 1000 : -1,@poll) : 0; |
82 | |
83 | return $ret |
84 | unless $ret > 0; |
85 | |
86 | while(@poll) { |
87 | my($fd,$got) = splice(@poll,0,2); |
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88 | $self->[1]{$fd} = $got if $got; |
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89 | } |
90 | |
91 | return $ret; |
92 | } |
93 | |
94 | sub events { |
95 | my $self = shift; |
96 | my $io = shift; |
97 | my $fd = fileno($io); |
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98 | exists $self->[1]{$fd} and exists $self->[0]{$fd}{$io} |
99 | ? $self->[1]{$fd} & ($self->[0]{$fd}{$io}|POLLHUP|POLLERR|POLLNVAL) |
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100 | : 0; |
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101 | } |
102 | |
103 | sub remove { |
104 | my $self = shift; |
105 | my $io = shift; |
106 | $self->mask($io,0); |
107 | } |
108 | |
109 | sub handles { |
110 | my $self = shift; |
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111 | return values %{$self->[2]} unless @_; |
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112 | |
113 | my $events = shift || 0; |
114 | my($fd,$ev,$io,$mask); |
115 | my @handles = (); |
116 | |
117 | while(($fd,$ev) = each %{$self->[1]}) { |
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118 | while (($io,$mask) = each %{$self->[0]{$fd}}) { |
119 | $mask |= POLLHUP|POLLERR|POLLNVAL; # must allow these |
120 | push @handles,$self->[2]{$io} if ($ev & $mask) & $events; |
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121 | } |
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122 | } |
123 | return @handles; |
124 | } |
125 | |
126 | 1; |
127 | |
128 | __END__ |
129 | |
130 | =head1 NAME |
131 | |
132 | IO::Poll - Object interface to system poll call |
133 | |
134 | =head1 SYNOPSIS |
135 | |
136 | use IO::Poll qw(POLLRDNORM POLLWRNORM POLLIN POLLHUP); |
137 | |
138 | $poll = new IO::Poll; |
139 | |
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140 | $poll->mask($input_handle => POLLIN); |
141 | $poll->mask($output_handle => POLLOUT); |
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142 | |
143 | $poll->poll($timeout); |
144 | |
145 | $ev = $poll->events($input); |
146 | |
147 | =head1 DESCRIPTION |
148 | |
149 | C<IO::Poll> is a simple interface to the system level poll routine. |
150 | |
151 | =head1 METHODS |
152 | |
153 | =over 4 |
154 | |
155 | =item mask ( IO [, EVENT_MASK ] ) |
156 | |
157 | If EVENT_MASK is given, then, if EVENT_MASK is non-zero, IO is added to the |
158 | list of file descriptors and the next call to poll will check for |
159 | any event specified in EVENT_MASK. If EVENT_MASK is zero then IO will be |
160 | removed from the list of file descriptors. |
161 | |
162 | If EVENT_MASK is not given then the return value will be the current |
163 | event mask value for IO. |
164 | |
165 | =item poll ( [ TIMEOUT ] ) |
166 | |
167 | Call the system level poll routine. If TIMEOUT is not specified then the |
168 | call will block. Returns the number of handles which had events |
169 | happen, or -1 on error. |
170 | |
171 | =item events ( IO ) |
172 | |
173 | Returns the event mask which represents the events that happend on IO |
174 | during the last call to C<poll>. |
175 | |
176 | =item remove ( IO ) |
177 | |
178 | Remove IO from the list of file descriptors for the next poll. |
179 | |
180 | =item handles( [ EVENT_MASK ] ) |
181 | |
182 | Returns a list of handles. If EVENT_MASK is not given then a list of all |
183 | handles known will be returned. If EVENT_MASK is given then a list |
184 | of handles will be returned which had one of the events specified by |
185 | EVENT_MASK happen during the last call ti C<poll> |
186 | |
187 | =back |
188 | |
189 | =head1 SEE ALSO |
190 | |
191 | L<poll(2)>, L<IO::Handle>, L<IO::Select> |
192 | |
193 | =head1 AUTHOR |
194 | |
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195 | Graham Barr. Currently maintained by the Perl Porters. Please report all |
196 | bugs to <perl5-porters@perl.org>. |
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197 | |
198 | =head1 COPYRIGHT |
199 | |
200 | Copyright (c) 1997-8 Graham Barr <gbarr@pobox.com>. All rights reserved. |
201 | This program is free software; you can redistribute it and/or |
202 | modify it under the same terms as Perl itself. |
203 | |
204 | =cut |