That's widely used pattern (1): 
package MyLib;

our $MyLibrarysGlobalCallStackInformation;

sub myfunc1
{
  local $MyLibrarysGlobalCallStackInformation = $somedata;

  myfunc2();
}

sub myfunc2
{
  # use $MyLibrarysGlobalCallStackInformation here
}

[download]
Another approach (2) would be pass data directly to functions. 
package MyLib;

sub myfunc1
{
  myfunc2($somedata);
}

sub myfunc2
{
  my ($somedata) = @_;
  # use $somedata here
}

[download]
Always use (2), if possible.
Usually you need (1) when writing some kind of fancy DSL.
For you case "goto &sub", you probably can hack something like this: 
package MyLib;

sub myfunc1
{
  my (@args) = @_;
  return myfunc2(@args, $somedata); #instead of goto &myfunc2
}

sub myfunc2
{
  my ($arg1, $arg2, $arg3, $somedata) = @_;
  if (defined $somedata) {
   .. # we got there from myfunc1
  }
}

[download]

In reply to Re: How to safely use $_ in a library function? by vsespb
in thread How to safely use $_ in a library function? by perl-diddler

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