To clarifie, the caller gets the contect of the CURRENT subroutine call, hence

#!/usr/bin/perl -w

use strict;
sub jojo {
        my ($package, $filename, $line, $subroutine, $hasargs, $wantar
+ray, $evaltext, $is_require) = caller(1);
        print "2: " . $subroutine . "\n";
}

sub jo {
        my ($package, $filename, $line, $subroutine, $hasargs, $wantar
+ray, $evaltext, $is_require) = caller(1);
        print "1: " . $subroutine . "\n";
        jojo;
}

jo;
[download]

would print:
Use of uninitialized value in concatenation (.) or string at ./test.pl line 11.
1:
2: main::jo
As you see, the first call doesn't show a caller, since there is no sub that clalled it, only the package would be known, and you should give the depth of info, thus the following should work

#!/usr/bin/perl -w

use strict;
sub jojo {
        my ($package, $filename, $line, $subroutine, $hasargs, $wantar
+ray, $evaltext, $is_require) = caller(1);
        print "2: $package - $subroutine \n";
}

sub jo {
        my ($package, $filename, $line, $subroutine, $hasargs, $wantar
+ray, $evaltext, $is_require) = caller();
        print "1: $package - $subroutine \n";
        jojo;
}

jo;
[download]

That prints:
1: main -
2: main - main::jo

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.