line |
stmt |
bran |
cond |
sub |
pod |
time |
code |
1
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337234
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use strict; |
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5
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13
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5
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144
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2
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25
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use warnings; |
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127
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5
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258
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3
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package IPC::OpenAny; |
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{ |
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$IPC::OpenAny::VERSION = '0.005'; |
6
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} |
7
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8
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# ABSTRACT: Run a process with control over any FDs it may use. |
9
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10
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5
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5
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4205
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use English qw(-no_match_vars); |
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5
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7711
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5
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32
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11
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5
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5
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1977
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use Carp; |
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5
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8
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5
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411
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12
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5
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5
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22
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use autodie; |
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5
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7
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5
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43
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13
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5
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5
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24459
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use Data::Dumper; |
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5
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13
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5
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305
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14
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5
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5
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4689
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use Params::Util qw(_STRING _ARRAYLIKE _CODELIKE); |
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5
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15764
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5
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469
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15
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16
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5
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5
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35
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use parent 'Exporter'; |
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5
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10
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5
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48
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17
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our @EXPORT_OK = qw(openany); |
18
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19
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our $DEBUG = 0; |
20
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21
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# TODO: Figure out how to send IO to/from scalar vals. |
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# It should probably be done in another module wrapping this one. |
23
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# TODO: validate all fds to make sure they are either a filehandle or undef. |
24
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# TODO: validate cmd spec as well... etc, etc. |
25
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26
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sub run { |
27
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7
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7
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1
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93694
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my (undef, %opt) = @_; |
28
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7
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50
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51
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my $cmd_spec = delete $opt{cmd_spec} or die "cmd_spec parameter is required!\n"; |
29
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7
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21
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my $fds = delete $opt{fds}; |
30
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7
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19
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my $env = delete $opt{env}; |
31
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7
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17
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my $pwd = delete $opt{pwd}; |
32
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7
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25
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my $pid = __fork_cmd($cmd_spec, $fds, $env, $pwd); |
33
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4
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50
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1175681
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waitpid $pid, 0 if $opt{wait}; |
34
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4
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210
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return $pid; |
35
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} |
36
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37
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0
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0
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1
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0
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sub openany { __PACKAGE__->run(@_) } |
38
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39
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# fork a child process in which to run the command/sub |
40
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sub __fork_cmd { |
41
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7
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7
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17
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my ($cmd_spec, $fds, $env, $pwd) = @_; |
42
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43
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7
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35
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my $pid = fork(); |
44
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7
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100
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14486
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return $pid if $pid; |
45
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46
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### now in child process... |
47
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48
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# set up working directory |
49
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3
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50
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243
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chdir $pwd if $pwd; |
50
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51
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# set up environment |
52
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3
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229
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$ENV{$_} = $env->{$_} for keys %$env; |
53
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54
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# go! |
55
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3
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242
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__setup_child_fds($fds); |
56
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3
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21
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__exec_cmd($cmd_spec); |
57
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58
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0
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0
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die "pid $PID should never have gotten here."; |
59
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} |
60
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61
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# do all the file-descriptor magic that the user asked for... |
62
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sub __setup_child_fds { |
63
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3
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3
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70
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my ($fds) = @_; |
64
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65
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# close all fds that are explicitly mapped to undef... |
66
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3
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453
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for my $fd ( grep { ! defined $fds->{$_} } keys %$fds) { |
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10
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81
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67
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2
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50
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114
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defined POSIX::close($fd) or die "Couldn't close descriptor [$fd] in pid [$PID]: $!\n"; |
68
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2
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35
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next; |
69
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} |
70
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71
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# figure out what gets mapped to what (parent => client) |
72
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8
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11543
|
my %p_map = |
73
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10
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48
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map { fileno($fds->{$_}) => $_ } |
74
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3
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16
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grep { defined $fds->{$_} } |
75
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keys %$fds; |
76
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77
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3
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275
|
my %c_map = reverse %p_map; |
78
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79
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# setup file descriptors in child, closing and duping etc. |
80
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3
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10
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my %redir_fds; |
81
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3
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55
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while ( my ($c_fd, $p_fd) = each %c_map ) { |
82
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83
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8
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31
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delete $p_map{$p_fd}; |
84
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8
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100
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151
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next if $c_fd == $p_fd; |
85
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86
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6
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100
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45
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$redir_fds{$c_fd} = POSIX::dup($c_fd) if $p_map{$c_fd}; |
87
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6
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100
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38
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$p_fd = $redir_fds{$p_fd} if $redir_fds{$p_fd}; |
88
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89
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6
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50
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87
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defined POSIX::close($c_fd) or die "Couldn't close descriptor [$c_fd] in pid [$PID]: $!\n"; |
90
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6
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50
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155
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defined POSIX::dup2($p_fd, $c_fd) or die "Couldn't dup2 [$p_fd],[$c_fd] in pid [$PID]: $!\n"; |
91
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6
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50
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222
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print STDOUT "Dup2 [$p_fd], [$c_fd]\n" if $DEBUG; |
92
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} |
93
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94
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|
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#my $tmp = POSIX::dup(1); |
95
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|
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#POSIX::dup2(2,1); |
96
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|
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#POSIX::dup2($tmp,2); |
97
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|
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#print "TMP: [$tmp]\n"; |
98
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|
99
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|
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} |
100
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101
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|
|
# finally, exec the command or sub. |
102
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|
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sub __exec_cmd { |
103
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3
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|
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3
|
|
13
|
my ($cmd_spec) = @_; |
104
|
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105
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3
|
50
|
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117
|
print Dumper $cmd_spec if $DEBUG; |
106
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|
107
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3
|
50
|
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|
38
|
if (_STRING($cmd_spec)) { |
108
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0
|
0
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0
|
exec $cmd_spec or die "Cannot exec [$cmd_spec]: $!\n"; |
109
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|
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} |
110
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111
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3
|
100
|
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|
163
|
if (_CODELIKE($cmd_spec)) { |
112
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2
|
|
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|
44
|
exit $cmd_spec->(); |
113
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|
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} |
114
|
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|
|
115
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1
|
50
|
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4
|
if (_ARRAYLIKE($cmd_spec)) { |
116
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117
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1
|
50
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|
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4
|
if (_CODELIKE($cmd_spec->[0])) { |
118
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0
|
|
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|
|
|
my $code = shift @$cmd_spec; |
119
|
0
|
|
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|
|
exit $code->(@$cmd_spec); |
120
|
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|
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} |
121
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122
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1
|
0
|
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|
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exec(@$cmd_spec) or die "Cannot exec [$cmd_spec->[0]]: $!\n"; |
123
|
|
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|
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|
|
} |
124
|
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125
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0
|
|
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|
|
croak "Invalid cmd_spec!\n"; |
126
|
|
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|
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} |
127
|
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|
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128
|
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|
|
1 && q{this statement is true}; |
129
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|
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130
|
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|
|
131
|
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=pod |
132
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133
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|
|
=head1 NAME |
134
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|
|
135
|
|
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|
|
|
|
IPC::OpenAny - Run a process with control over any FDs it may use. |
136
|
|
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|
|
|
137
|
|
|
|
|
|
|
=head1 VERSION |
138
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139
|
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|
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version 0.005 |
140
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141
|
|
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|
|
=head1 SYNOPSIS |
142
|
|
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|
|
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|
143
|
|
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|
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|
|
use IPC::OpenAny qw(openany); |
144
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145
|
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|
|
open my $fh, '>', 'fd3_out.txt'; |
146
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|
|
147
|
|
|
|
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|
|
my $cmd_sub = sub { |
148
|
|
|
|
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|
|
print STDOUT "foo1\n"; |
149
|
|
|
|
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|
|
print STDERR "foo2\n"; |
150
|
|
|
|
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|
|
my $fd3_fh = IO::Handle->new_from_fd(3, '>'); |
151
|
|
|
|
|
|
|
print $fd3_fh "foo3\n"; |
152
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|
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}; |
153
|
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|
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|
154
|
|
|
|
|
|
|
# call the class method |
155
|
|
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|
|
my $pid = IPC::OpenAny->run( |
156
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|
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|
|
|
|
cmd_spec => $cmd_sub, |
157
|
|
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|
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|
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fds => { |
158
|
|
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|
|
|
0 => undef, # close this |
159
|
|
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|
|
|
1 => \*STDERR, # foo1 |
160
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|
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2 => \*STDOUT, # foo2 |
161
|
|
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|
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|
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3 => $fh, # foo3 |
162
|
|
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|
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|
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}, |
163
|
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|
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|
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wait => 1, |
164
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|
|
|
|
|
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); |
165
|
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|
|
|
166
|
|
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|
|
167
|
|
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|
|
# OR use the exported sub |
168
|
|
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|
|
|
|
open my $fd1_fh, '<', $0; |
169
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|
|
|
|
|
|
my $pid2 = openany( |
170
|
|
|
|
|
|
|
cmd_spec => [qw(tr a-zA-Z n-za-mN-ZA-M)], |
171
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|
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fds => { |
172
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|
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|
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0 => $fd1_fh, |
173
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|
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}, |
174
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|
|
); |
175
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176
|
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|
|
=head1 DESCRIPTION |
177
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|
178
|
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|
|
B
|
179
|
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|
|
OR FEATURE REQUESTS> |
180
|
|
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|
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|
|
|
181
|
|
|
|
|
|
|
In the spirit of L and L, which give you 2 and 3 handles |
182
|
|
|
|
|
|
|
to a child process, IPC::OpenAny makes it easy to start a process with any |
183
|
|
|
|
|
|
|
file descriptors you want connected to whatever handles you want. |
184
|
|
|
|
|
|
|
|
185
|
|
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|
|
|
|
=head1 METHODS |
186
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|
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187
|
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|
|
=head2 run |
188
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|
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189
|
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|
|
|
Runs the given command or code-ref in a separate process, with its |
190
|
|
|
|
|
|
|
file descriptors mapped to handles or closed (or just left alone) |
191
|
|
|
|
|
|
|
however the user may choose. |
192
|
|
|
|
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|
193
|
|
|
|
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|
|
Accepts the following parameters: |
194
|
|
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|
|
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|
195
|
|
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|
|
|
|
=over 4 |
196
|
|
|
|
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|
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|
197
|
|
|
|
|
|
|
=item cmd_spec |
198
|
|
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|
|
|
199
|
|
|
|
|
|
|
This specifies the command or code to be executed. |
200
|
|
|
|
|
|
|
If it is a string, it will be passed to L() which |
201
|
|
|
|
|
|
|
will invoke it via the shell. If it is a coderef, that |
202
|
|
|
|
|
|
|
coderef will be executed in a sepearate process just |
203
|
|
|
|
|
|
|
like a system command. If it is an arrayref, the first |
204
|
|
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|
|
|
element will be used as the system command to execute, |
205
|
|
|
|
|
|
|
and the remaining elements will be the arguments passed |
206
|
|
|
|
|
|
|
to it. (I | I | I) |
207
|
|
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|
|
|
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|
208
|
|
|
|
|
|
|
=item fds |
209
|
|
|
|
|
|
|
|
210
|
|
|
|
|
|
|
Set this to a hashref where the keys are file descriptor |
211
|
|
|
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numbers in the child process and the values are either |
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perl file handles or undef. (I) |
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=item env |
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variables and the values are the values you want set for those env |
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vars when the process is executed. (I) |
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=item pwd |
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Set this to the path you want to be the working directory of the |
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process that will be executed. (I) |
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=back |
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=head1 FUNCTIONS |
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=head2 openany |
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This exportable sub is just a thin wrapper around the L |
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method above. It takes the exact same parameters. |
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=head1 SEE ALSO |
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=over 4 |
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=item * |
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L |
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=item * |
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L |
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=item * |
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L |
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=item * |
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L |
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=back |
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=head1 CAVEATS |
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May not work on Win32, and I don't have a windows box with which to |
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develop and test it. Patches welcome! |
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As usual, please report any other issues you may encounter! |
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=head1 AUTHOR |
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Stephen R. Scaffidi |
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=head1 COPYRIGHT AND LICENSE |
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This software is copyright (c) 2012 by Stephen R. Scaffidi. |
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This is free software; you can redistribute it and/or modify it under |
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the same terms as the Perl 5 programming language system itself. |
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=cut |
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__END__ |