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1 | |
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 (); | |
13 | our(@ISA, @EXPORT_OK, @EXPORT, $VERSION); | |
14 | ||
15 | @ISA = qw(Exporter); | |
16 | $VERSION = "0.06"; | |
17 | ||
18 | @EXPORT = qw( POLLIN | |
19 | POLLOUT | |
20 | POLLERR | |
21 | POLLHUP | |
22 | POLLNVAL | |
23 | ); | |
24 | ||
25 | @EXPORT_OK = qw( | |
26 | POLLPRI | |
27 | POLLRDNORM | |
28 | POLLWRNORM | |
29 | POLLRDBAND | |
30 | POLLWRBAND | |
31 | POLLNORM | |
32 | ); | |
33 | ||
34 | # [0] maps fd's to requested masks | |
35 | # [1] maps fd's to returned masks | |
36 | # [2] maps fd's to handles | |
37 | sub new { | |
38 | my $class = shift; | |
39 | ||
40 | my $self = bless [{},{},{}], $class; | |
41 | ||
42 | $self; | |
43 | } | |
44 | ||
45 | sub mask { | |
46 | my $self = shift; | |
47 | my $io = shift; | |
48 | my $fd = fileno($io); | |
49 | if (@_) { | |
50 | my $mask = shift; | |
51 | if($mask) { | |
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 { | |
56 | delete $self->[0]{$fd}{$io}; | |
57 | unless(%{$self->[0]{$fd}}) { | |
58 | # We no longer have any handles for this FD | |
59 | delete $self->[1]{$fd}; | |
60 | delete $self->[0]{$fd}; | |
61 | } | |
62 | delete $self->[2]{$io}; | |
63 | } | |
64 | } | |
65 | ||
66 | return unless exists $self->[0]{$fd} and exists $self->[0]{$fd}{$io}; | |
67 | return $self->[0]{$fd}{$io}; | |
68 | } | |
69 | ||
70 | ||
71 | sub poll { | |
72 | my($self,$timeout) = @_; | |
73 | ||
74 | $self->[1] = {}; | |
75 | ||
76 | my($fd,$mask,$iom); | |
77 | my @poll = (); | |
78 | ||
79 | while(($fd,$iom) = each %{$self->[0]}) { | |
80 | $mask = 0; | |
81 | $mask |= $_ for values(%$iom); | |
82 | push(@poll,$fd => $mask); | |
83 | } | |
84 | ||
85 | my $ret = @poll ? _poll(defined($timeout) ? $timeout * 1000 : -1,@poll) : 0; | |
86 | ||
87 | return $ret | |
88 | unless $ret > 0; | |
89 | ||
90 | while(@poll) { | |
91 | my($fd,$got) = splice(@poll,0,2); | |
92 | $self->[1]{$fd} = $got if $got; | |
93 | } | |
94 | ||
95 | return $ret; | |
96 | } | |
97 | ||
98 | sub events { | |
99 | my $self = shift; | |
100 | my $io = shift; | |
101 | my $fd = fileno($io); | |
102 | exists $self->[1]{$fd} and exists $self->[0]{$fd}{$io} | |
103 | ? $self->[1]{$fd} & ($self->[0]{$fd}{$io}|POLLHUP|POLLERR|POLLNVAL) | |
104 | : 0; | |
105 | } | |
106 | ||
107 | sub remove { | |
108 | my $self = shift; | |
109 | my $io = shift; | |
110 | $self->mask($io,0); | |
111 | } | |
112 | ||
113 | sub handles { | |
114 | my $self = shift; | |
115 | return values %{$self->[2]} unless @_; | |
116 | ||
117 | my $events = shift || 0; | |
118 | my($fd,$ev,$io,$mask); | |
119 | my @handles = (); | |
120 | ||
121 | while(($fd,$ev) = each %{$self->[1]}) { | |
122 | while (($io,$mask) = each %{$self->[0]{$fd}}) { | |
123 | $mask |= POLLHUP|POLLERR|POLLNVAL; # must allow these | |
124 | push @handles,$self->[2]{$io} if ($ev & $mask) & $events; | |
125 | } | |
126 | } | |
127 | return @handles; | |
128 | } | |
129 | ||
130 | 1; | |
131 | ||
132 | __END__ | |
133 | ||
134 | =head1 NAME | |
135 | ||
136 | IO::Poll - Object interface to system poll call | |
137 | ||
138 | =head1 SYNOPSIS | |
139 | ||
140 | use IO::Poll qw(POLLRDNORM POLLWRNORM POLLIN POLLHUP); | |
141 | ||
142 | $poll = new IO::Poll; | |
143 | ||
144 | $poll->mask($input_handle => POLLIN); | |
145 | $poll->mask($output_handle => POLLOUT); | |
146 | ||
147 | $poll->poll($timeout); | |
148 | ||
149 | $ev = $poll->events($input); | |
150 | ||
151 | =head1 DESCRIPTION | |
152 | ||
153 | C<IO::Poll> is a simple interface to the system level poll routine. | |
154 | ||
155 | =head1 METHODS | |
156 | ||
157 | =over 4 | |
158 | ||
159 | =item mask ( IO [, EVENT_MASK ] ) | |
160 | ||
161 | If EVENT_MASK is given, then, if EVENT_MASK is non-zero, IO is added to the | |
162 | list of file descriptors and the next call to poll will check for | |
163 | any event specified in EVENT_MASK. If EVENT_MASK is zero then IO will be | |
164 | removed from the list of file descriptors. | |
165 | ||
166 | If EVENT_MASK is not given then the return value will be the current | |
167 | event mask value for IO. | |
168 | ||
169 | =item poll ( [ TIMEOUT ] ) | |
170 | ||
171 | Call the system level poll routine. If TIMEOUT is not specified then the | |
172 | call will block. Returns the number of handles which had events | |
173 | happen, or -1 on error. | |
174 | ||
175 | =item events ( IO ) | |
176 | ||
177 | Returns the event mask which represents the events that happend on IO | |
178 | during the last call to C<poll>. | |
179 | ||
180 | =item remove ( IO ) | |
181 | ||
182 | Remove IO from the list of file descriptors for the next poll. | |
183 | ||
184 | =item handles( [ EVENT_MASK ] ) | |
185 | ||
186 | Returns a list of handles. If EVENT_MASK is not given then a list of all | |
187 | handles known will be returned. If EVENT_MASK is given then a list | |
188 | of handles will be returned which had one of the events specified by | |
189 | EVENT_MASK happen during the last call ti C<poll> | |
190 | ||
191 | =back | |
192 | ||
193 | =head1 SEE ALSO | |
194 | ||
195 | L<poll(2)>, L<IO::Handle>, L<IO::Select> | |
196 | ||
197 | =head1 AUTHOR | |
198 | ||
199 | Graham Barr. Currently maintained by the Perl Porters. Please report all | |
200 | bugs to <perl5-porters@perl.org>. | |
201 | ||
202 | =head1 COPYRIGHT | |
203 | ||
204 | Copyright (c) 1997-8 Graham Barr <gbarr@pobox.com>. All rights reserved. | |
205 | This program is free software; you can redistribute it and/or | |
206 | modify it under the same terms as Perl itself. | |
207 | ||
208 | =cut |