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package Log::Dispatch::File::Locked; |
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11454
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use strict; |
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641
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use warnings; |
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232
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976
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6
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our $VERSION = '2.71'; |
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use Fcntl qw(:DEFAULT :flock); |
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22
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8700
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use base qw( Log::Dispatch::File ); |
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22
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10749
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11
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sub log_message { |
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60
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0
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349
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my $self = shift; |
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60
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490
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my %p = @_; |
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60
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100
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354
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if ( $self->{close_after_write} ) { |
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30
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385
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$self->_open_file; |
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} |
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60
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382
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my $fh = $self->{fh}; |
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60
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2081
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flock( $fh, LOCK_EX ) |
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or die "Cannot lock '$self->{filename}' for writing: $!"; |
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25
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# just in case there was an append while we waited for the lock |
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60
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50
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1050
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seek( $fh, 0, 2 ) |
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or die "Cannot seek to end of '$self->{filename}': $!"; |
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60
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if ( $self->{syswrite} ) { |
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defined syswrite( $fh, $p{message} ) |
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0
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0
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0
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or die "Cannot write to '$self->{filename}': $!"; |
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} |
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else { |
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print $fh $p{message} |
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60
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50
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2892
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or die "Cannot write to '$self->{filename}': $!"; |
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} |
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60
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50
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988
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flock( $fh, LOCK_UN ) or die "Cannot unlock '$self->{filename}'"; |
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60
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100
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748
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if ( $self->{close_after_write} ) { |
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641
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close $fh |
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or die "Cannot close '$self->{filename}': $!"; |
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30
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557
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delete $self->{fh}; |
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} |
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} |
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46
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1; |
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48
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# ABSTRACT: Subclass of Log::Dispatch::File to facilitate locking |
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50
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__END__ |
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52
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=pod |
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54
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=encoding UTF-8 |
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56
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=head1 NAME |
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58
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Log::Dispatch::File::Locked - Subclass of Log::Dispatch::File to facilitate locking |
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60
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=head1 VERSION |
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62
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version 2.71 |
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64
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=head1 SYNOPSIS |
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66
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use Log::Dispatch; |
67
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68
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my $log = Log::Dispatch->new( |
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outputs => [ |
70
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[ |
71
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'File::Locked', |
72
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min_level => 'info', |
73
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filename => 'Somefile.log', |
74
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mode => '>>', |
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newline => 1 |
76
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] |
77
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], |
78
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); |
79
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80
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$log->emerg("I've fallen and I can't get up"); |
81
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82
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=head1 DESCRIPTION |
83
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84
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This module acts exactly like L<Log::Dispatch::File> except that it obtains an |
85
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exclusive lock on the file while opening it. |
86
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87
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Note that if you are using this output because you want to write to a file from |
88
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multiple processes, you should open the file with the append C<mode> (C<<< >> |
89
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>>>), or else it's quite likely that one process will overwrite another. |
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91
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=head1 SEE ALSO |
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93
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L<perlfunc/flock> |
94
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95
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=head1 SUPPORT |
96
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97
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Bugs may be submitted at L<https://github.com/houseabsolute/Log-Dispatch/issues>. |
98
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99
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=head1 SOURCE |
100
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101
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The source code repository for Log-Dispatch can be found at L<https://github.com/houseabsolute/Log-Dispatch>. |
102
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103
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=head1 AUTHOR |
104
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105
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Dave Rolsky <autarch@urth.org> |
106
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107
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=head1 COPYRIGHT AND LICENSE |
108
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109
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This software is Copyright (c) 2023 by Dave Rolsky. |
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111
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This is free software, licensed under: |
112
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113
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The Artistic License 2.0 (GPL Compatible) |
114
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115
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The full text of the license can be found in the |
116
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F<LICENSE> file included with this distribution. |
117
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118
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=cut |