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package ExtUtils::FindFunctions; |
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use strict; |
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use Carp; |
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use DynaLoader; |
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require Exporter; |
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{ no strict; |
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$VERSION = '0.02'; |
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@ISA = qw(Exporter); |
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@EXPORT = qw(&have_functions); |
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} |
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=head1 NAME |
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ExtUtils::FindFunctions - Find functions in external libraries |
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=head1 VERSION |
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Version 0.02 |
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=head1 SYNOPSIS |
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use ExtUtils::FindFunctions; |
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my @check = qw(pcap_findalldevs pcap_open_dead pcap_setnonblock pcap_lib_version); |
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my @funcs = have_functions(libs => '-lpcap', funcs => \@check, return_as => 'array'); |
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=head1 DESCRIPTION |
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This module provides the C function which can be used to |
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check if given functions are provided by an external library. Its aim is |
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to be used as an embedded library by F which needs such |
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facilities. Use the B command to embed it |
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in your distribution. |
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=head1 EXPORT |
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The module exports by default the C function. |
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=head1 FUNCTIONS |
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=head2 have_functions() |
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Load the specified libraries and search for the given functions names. |
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The results are returned as an array or as an hash depending on the |
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C parameter. |
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B |
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=over |
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=item * |
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C - specify the libraries to load; this argument will be given |
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to C |
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=item * |
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C - a reference to the list of functions to search |
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=item * |
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C - specify the type of the result, either as an C |
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or as a C. As an array, only the functions found in the libraries |
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are returned. As a hash, the keys are the function names and their value |
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indicates if the function is present or not. |
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=back |
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=cut |
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sub have_functions { |
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my %args = @_; |
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my %funcs = (); |
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# check params |
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defined $args{$_} or croak "error: Missing parameter '$_'.\n" for qw(libs funcs return_as); |
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$args{return_as} ||= 'array'; |
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$args{return_as} =~ /^(?:array|hash)$/ |
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or croak "error: Incorrect value for parameter 'return_as'.\n"; |
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my @libs = ref $args{libs} eq '' ? $args{libs} |
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: ref $args{libs} eq 'ARRAY' ? @{$args{libs}} |
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: croak "error: Incorrect argument for parameter 'libs'.\n"; |
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# search for functions |
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for my $lib (@libs) { |
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my @paths = DynaLoader::dl_findfile($lib); |
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for my $path (@paths) { |
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my $libref = DynaLoader::dl_load_file($path); |
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for my $func (@{$args{funcs}}) { |
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my $symref = DynaLoader::dl_find_symbol($libref, $func); |
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$funcs{$func} = ! ! defined $symref; |
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} |
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DynaLoader::dl_unload_file($libref); |
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} |
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} |
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return $args{return_as} eq 'hash' ? %funcs |
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: grep { $funcs{$_} } sort keys %funcs; |
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} |
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108
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=head1 AUTHOR |
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SEbastien Aperghis-Tramoni, C<< >> |
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113
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=head1 BUGS |
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Please report any bugs or feature requests to |
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C, or through the web interface at |
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L. |
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I will be notified, and then you'll automatically be notified of progress on |
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your bug as I make changes. |
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=head1 SUPPORT |
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You can find documentation for this module with the perldoc command. |
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perldoc ExtUtils::FindFunctions |
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You can also look for information at: |
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=over |
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=item * AnnoCPAN: Annotated CPAN documentation |
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L |
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=item * CPAN Ratings |
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L |
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=item * RT: CPAN's request tracker |
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L |
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=item * Search CPAN |
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L |
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=back |
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=head1 COPYRIGHT & LICENSE |
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153
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Copyright 2006 SEbastien Aperghis-Tramoni, all rights reserved. |
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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=cut |
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1; # End of ExtUtils::FindFunctions |