Mastering Modern Perl: Writing Efficient and Maintainable Code/

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Reporting Errors

Reporting Errors

Learn how to report errors.

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The caller built-in

We use the caller built-in to inspect a function’s calling context. When passed no arguments, caller returns a list containing the name of the calling package, the name of the file containing the call, and the line number of the file on which the call occurred:

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package main;
main();
sub main {
    show_call_information();
}
sub show_call_information {
    my ($package, $file, $line) = caller();
    say "Called from $package in $file:$line";
}

The full call chain is available for inspection. Pass a single-integer argument n to caller() to ...