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package Sys::Trace; |
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95415
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use strict; |
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use Sys::Trace::Results; |
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our $VERSION = "0.03"; |
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=head1 NAME |
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Sys::Trace - Interface to system call tracing interfaces |
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=head1 SYNOPSIS |
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use Sys::Trace; |
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my $trace = Sys::Trace->new(exec => [qw(ls foo)]); |
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$trace->start; # Returns a PID which you can watch |
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$trace->wait; # Alternatively call this to wait on the PID |
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my $result = $trace->results; # Returns a Sys::Trace::Results object |
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use Cwd; |
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print $result->files(getcwd . "/"); # Should show an attempt to look at "foo" |
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# in the current directory (i.e. "ls |
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# foo", above) |
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=head1 DESCRIPTION |
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Provides a way to programmatically run or trace a program and see the system |
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calls it makes. |
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This can be useful during testing as a way to ensure a particular file is |
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actually opened, or another hard to test interaction actually occurs. |
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Currently supported tracing mechanisms are ktrace, strace and truss. |
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=head1 METHODS |
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=cut |
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our @INTERFACES = qw( |
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Sys::Trace::Impl::Strace |
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Sys::Trace::Impl::Ktrace |
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Sys::Trace::Impl::Truss |
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); |
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our @ISA; |
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my $interface_class = ""; |
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=head2 new(%args) |
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Keys in C<%args> can be: |
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=over 4 |
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=item * |
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B: Program and arguments to execute |
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=item * |
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B: PID of program to trace |
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=item * |
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B: Follow child processes too (default is 1, set to 0 to disable) |
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=back |
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Only one of exec or pid must be provided. |
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=cut |
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sub new { |
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my($class, %args) = @_; |
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if(!$interface_class) { |
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for my $interface(@INTERFACES) { |
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my $file = $interface; |
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$file =~ s{::}{/}g; |
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$file .= ".pm"; |
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eval { require $file } or next; |
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if($interface->usable) { |
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$interface_class = $interface; |
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@ISA = $interface_class; |
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last; |
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} |
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} |
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} |
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if(!$interface_class) { |
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require Carp; |
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Carp::croak("No interface for system call tracing is available on this platform"); |
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} |
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# Default to following forks |
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$args{follow_forks} = 1 unless exists $args{follow_forks}; |
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return $class->SUPER::new(%args); |
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} |
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104
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=head2 start |
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106
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Start running the trace. |
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108
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=cut |
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110
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sub start { |
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my($self) = @_; |
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if(!defined $self->pid(fork)) { |
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die "Unable to fork: $!"; |
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} |
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return $self->pid if $self->pid; # parent |
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$self->run; |
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} |
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121
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=head2 wait |
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123
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Wait for the trace to finish |
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125
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=cut |
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127
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sub wait { |
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my($self) = @_; |
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$? if waitpid $self->pid, 0; |
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} |
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133
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=head2 results |
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135
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Return a L object populated with the results of the trace. |
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137
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=cut |
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139
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sub results { |
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my($self) = @_; |
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return Sys::Trace::Results->new($self); |
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} |
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145
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1; |
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147
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__END__ |