Commit | Line | Data |
c8aac497 |
1 | |
cf7fe8a2 |
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 (); |
17f410f9 |
13 | our(@ISA, @EXPORT_OK, @EXPORT, $VERSION); |
cf7fe8a2 |
14 | |
15 | @ISA = qw(Exporter); |
5284b67e |
16 | $VERSION = "0.06"; |
cf7fe8a2 |
17 | |
c8aac497 |
18 | @EXPORT = qw( POLLIN |
19 | POLLOUT |
20 | POLLERR |
21 | POLLHUP |
22 | POLLNVAL |
23 | ); |
cf7fe8a2 |
24 | |
25 | @EXPORT_OK = qw( |
cf7fe8a2 |
26 | POLLPRI |
cf7fe8a2 |
27 | POLLRDNORM |
28 | POLLWRNORM |
29 | POLLRDBAND |
30 | POLLWRBAND |
31 | POLLNORM |
c8aac497 |
32 | ); |
cf7fe8a2 |
33 | |
c8aac497 |
34 | # [0] maps fd's to requested masks |
35 | # [1] maps fd's to returned masks |
36 | # [2] maps fd's to handles |
cf7fe8a2 |
37 | sub new { |
38 | my $class = shift; |
39 | |
c8aac497 |
40 | my $self = bless [{},{},{}], $class; |
cf7fe8a2 |
41 | |
42 | $self; |
43 | } |
44 | |
45 | sub mask { |
46 | my $self = shift; |
47 | my $io = shift; |
48 | my $fd = fileno($io); |
c8aac497 |
49 | if (@_) { |
cf7fe8a2 |
50 | my $mask = shift; |
cf7fe8a2 |
51 | if($mask) { |
c8aac497 |
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 { |
5284b67e |
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}; |
cf7fe8a2 |
63 | } |
64 | } |
c8aac497 |
65 | |
66 | return unless exists $self->[0]{$fd} and exists $self->[0]{$fd}{$io}; |
334f17bd |
67 | return $self->[0]{$fd}{$io}; |
cf7fe8a2 |
68 | } |
69 | |
70 | |
71 | sub poll { |
72 | my($self,$timeout) = @_; |
73 | |
74 | $self->[1] = {}; |
75 | |
c8aac497 |
76 | my($fd,$mask,$iom); |
cf7fe8a2 |
77 | my @poll = (); |
78 | |
c8aac497 |
79 | while(($fd,$iom) = each %{$self->[0]}) { |
80 | $mask = 0; |
81 | $mask |= $_ for values(%$iom); |
82 | push(@poll,$fd => $mask); |
cf7fe8a2 |
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); |
c8aac497 |
92 | $self->[1]{$fd} = $got if $got; |
cf7fe8a2 |
93 | } |
94 | |
95 | return $ret; |
96 | } |
97 | |
98 | sub events { |
99 | my $self = shift; |
100 | my $io = shift; |
101 | my $fd = fileno($io); |
c8aac497 |
102 | exists $self->[1]{$fd} and exists $self->[0]{$fd}{$io} |
103 | ? $self->[1]{$fd} & ($self->[0]{$fd}{$io}|POLLHUP|POLLERR|POLLNVAL) |
334f17bd |
104 | : 0; |
cf7fe8a2 |
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 $self = shift; |
c8aac497 |
115 | return values %{$self->[2]} unless @_; |
cf7fe8a2 |
116 | |
117 | my $events = shift || 0; |
118 | my($fd,$ev,$io,$mask); |
119 | my @handles = (); |
120 | |
121 | while(($fd,$ev) = each %{$self->[1]}) { |
c8aac497 |
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; |
334f17bd |
125 | } |
cf7fe8a2 |
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 | |
c8aac497 |
144 | $poll->mask($input_handle => POLLIN); |
145 | $poll->mask($output_handle => POLLOUT); |
cf7fe8a2 |
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 | |
854822f1 |
199 | Graham Barr. Currently maintained by the Perl Porters. Please report all |
200 | bugs to <perl5-porters@perl.org>. |
cf7fe8a2 |
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 |