This file is indexed.

/usr/share/perl5/IO/Capture/Stderr.pm is in libio-capture-perl 0.05-4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
package IO::Capture::Stderr;
use strict;
use warnings;
use Carp;
use base qw/IO::Capture/;
use IO::Capture::Tie_STDx;

sub _start {
	my $self = shift;
	$self->line_pointer(1);

	if ( _capture_warn_check() ) {
		$self->{'IO::Capture::handler_save'} = defined $SIG{__WARN__} ? $SIG{__WARN__} : 'DEFAULT';
		$SIG{__WARN__} = sub {print STDERR @_;};
	}
	else {
		$self->{'IO::Capture::handler_save'} = undef;
	}
    tie *STDERR, "IO::Capture::Tie_STDx";
}

sub _retrieve_captured_text {
    my $self = shift;
    my $messages = \@{$self->{'IO::Capture::messages'}};

     @$messages = <STDERR>;
	return 1;
}

sub _check_pre_conditions {
	my $self = shift;

	return unless $self->SUPER::_check_pre_conditions;

	if (tied *STDERR) {
		carp "WARNING: STDERR already tied, unable to capture";
		return;
	}
	return 1;
}

sub _stop {
	my $self = shift;
    untie *STDERR;
	$SIG{__WARN__} = $self->{'IO::Capture::handler_save'} if defined $self->{'IO::Capture::handler_save'};
    return 1;
}

#  _capture_warn_check
#
#  Check to see if SIG{__WARN__} handler should be set to direct output
# from warn() to IO::Capture::Stderr.  
#   There are three things to take into consideration.  
#   
#   1) Is the version of perl less than 5.8?
#      - Before 5.8, there was a bug that caused output from warn() 
#        not to be sent to STDERR if it (STDERR) was tied.
#        So, we need to put a handler in to send warn() text to
#        STDERR so IO::Capture::Stderr will capture it.
#   2) Is there a handler set already?
#      - The default handler for SIG{__WARN__} is to send to STDERR.
#        But, if it is set by the program, it may do otherwise, and
#        we don't want to break that. 
#   3)  FORCE_CAPTURE_WARN => 1
#      - To allow users to override a previous handler that was set on
#        SIG{__WARN__}, there is a variable that can be set.  If set,
#        when there is a handler set on IO::Capture::Stderr startup,
#        it will be saved and a new hander set that captures output to
#        IO::Capture::Stderr.  On stop, it will restore the programs
#        handler.
#      
#
#                    
#    Perl   |  FORCE_CAPTURE_WARN  |  Program has   | Set our own
#    < 5.8  |  is set              |  handler set   | handler
#   --------+----------------------+----------------+------------
#           |                      |                |
#   --------+----------------------+----------------+------------
#      X    |                      |                |     X (1)
#   --------+----------------------+----------------+------------
#           |          X           |                |
#   --------+----------------------+----------------+------------
#      X    |          X           |                |     X (1)
#   --------+----------------------+----------------+------------
#           |                      |        X       |
#   --------+----------------------+----------------+------------
#      X    |                      |        X       |
#   --------+----------------------+----------------+------------
#           |          X           |        X       |     X (2)
#   --------+----------------------+----------------+------------
#      X    |          X           |        X       |     X (2)
#   --------+----------------------+----------------+------------
#     (1) WAR to get around bug
#     (2) Replace programs handler with our own

sub _capture_warn_check {
	my $self = shift;

	if (!defined $SIG{__WARN__} ) {
		return $^V lt v5.8 ? 1 : 0;
	}
	return $self->{'FORCE_CAPTURE_WARN'} ? 1 : 0;
}
1;

__END__

=head1 NAME

C<IO::Capture::Stderr> - Capture all output sent to C<STDERR>

=head1 SYNOPSIS

    use IO::Capture::Stderr;

    $capture = IO::Capture::Stderr->new();

    $capture->start(); 		# STDERR Output captured
    print STDERR "Test Line One\n";
    print STDERR "Test Line Two\n";
    print STDERR "Test Line Three\n";
    $capture->stop();		# STDERR output sent to wherever it was before 'start'

    # In 'scalar context' returns next line
    $line = $capture->read;
    print "$line";         # prints "Test Line One"

    $line = $capture->read;
    print "$line";         # prints "Test Line Two"

    # move line pointer to line 1
    $capture->line_pointer(1);

    $line = $capture->read;
    print "$line";         # prints "Test Line One"

    # Find out current line number
    $current_line_position = $capture->line_pointer;

    # In 'List Context' return an array(list)
    @all_lines = $capture->read;

    # Example 1 - "Using in module tests"
    #  Note: If you don't want to make users install 
    #        the IO::Capture module just for your tests,
    #        you can just install in the t/lib directory
    #        of your module and use the lib pragma in  
    #        your tests. 

    use lib "t/lib";
    use IO::Capture:Stderr;

    use Test::More;

	# Create new capture object.  Showing FORCE_CAPTURE_WARN being cleared
	# for example, but 0 is the default, so you don't need to specify
	# unless you want to set.
    my $capture =  IO::Capture:Stderr->new( {FORCE_CAPTURE_WARN => 0} );
    $capture->start

    # execute with a bad parameter to make sure get
    # an error.

    ok( ! $test("Bad Parameter") );

    $capture->stop();

    

=head1 DESCRIPTION

The module C<IO::Capture::Stderr>, is derived from the abstract class C<IO::Capture>.
See L<IO::Capture>. The purpose of the module (as the name suggests) is to capture 
any output sent to C<STDOUT>.  After the capture is stopped, the STDOUT filehandle 
will be reset to the previous location. E.g., If previously redirected to a file, when 
C<IO::Capture-E<gt>stop> is called, output will start going into that file again.

Note:  This module won't work with the perl function, system(), or any other operation 
       involving a fork().  If you want to capture the output from a system command,
       it is faster to use open() or back-ticks.  

       my $output = `/usr/sbin/ls -l 2>&1`;

=head1 METHODS

=head2 new

=over 4

=item *

Creates a new capture object.  

=item *

An object can be reused as needed, so will only need to do one of these. 

=over 4

=item *

Be aware, any data previously captured will be discarded if a new 
capture session is started.  

=back

=back

=head2 start

=over 4

=item *

Start capturing data into the C<IO::Capture> Object.

=item *

Can B<not> be called on an object that is already capturing.

=item *

Can B<not> be called while STDERR tied to an object.  

=item *

C<undef> will be returned on an error.

=back

=head2 stop

=over 4

=item *

Stop capturing data and point STDERR back to it's previous output location
I.e., untie STDERR

=back

=head2 read

=over 4

=item *

In I<Scalar Context>

=over 4

=item *

Lines are read from the buffer at the position of the C<line_pointer>, 
and the pointer is incremented by one.

    $next_line = $capture->read;

=back

=item *

In I<List Context>

=over 4

=item *

The array is returned.  The C<line_pointer> is not affected.

    @buffer = $capture->read;

=back

=item *

Data lines are returned exactly as they were captured.  You may want 
to use C<chomp> on them if you don't want the end of line character(s)

    while (my $line = $capture->read) {
	chomp $line;
	$cat_line = join '', $cat_line, $line;
    }

=back

=head2 line_pointer

=over 4

=item *

Reads or sets the C<line_pointer>.

    my $current_line = $capture->line_pointer;
    $capture->line_pointer(1);

=back

=head1 ARGUMENTS

Pass any arguments to new() in a single array reference.

   IO::Capture::Stderr->new( {FORCE_CAPTURE_WARN => 1} );

=head2 FORCE_CAPTURE_WARN

=over 4


Normally, IO::Capture::Stderr will capture text from I<warn()> function calls. This is because output
from I<warn()> is normally directed to STDERR.  If you wish to force IO::Capture::Stderr to grab the
text from I<warn()>, set FORCE_CAPTURE_WARN to a 1.  Then C<IO::Capture::Stderr> will save the handle
that C<$SIG{__WARN__}> was set to, redirect it to itself on C<start()>, and then set C<$SIG{__WARN__}> 
back after C<stop()> is called.

=back

=head1 SUB-CLASSING

=head2 Adding Features

If you would like to sub-class this module to add a feature (method) or two,
here is a couple of easy steps. Also see L<IO::Capture::Overview>.

=over 4

=item 1

Give your package a name

    package MyPackage;

=item 2

Use this C<IO::Capture::Stderr> as your base class like this:

    package MyPackage;

    use base qw/IO::Capture::Stderr/;

=item 3

Add your new method like this

    package MyPackage;

    use base qw/IO::Capture::Stderr/;

    sub grep {
	my $self = shift;

	for $line (
    }

=back

=head1 See Also

L<IO::Capture::Overview>

L<IO::Capture>

L<IO::Capture::Stdout>

=head1 AUTHORS

Mark Reynolds
reynolds@sgi.com

Jon Morgan
jmorgan@sgi.com

=head1 COPYRIGHT

Copyright (c) 2003, Mark Reynolds. All Rights Reserved.
This module is free software. It may be used, redistributed
and/or modified under the same terms as Perl itself.

=cut