{
   # Temporarily undefine STDOUT.
   local *STDOUT;
   func();
}

##</code><code>##

sub func { print("in func\n"); }

print("pre func\n");
{
   # Temporarily undefine STDOUT.
   local *STDOUT;
   func();
}
print("post func\n");

##</code><code>##

{
   # Temporarily redirect STDOUT.
   open(local *STDOUT, '>', '/dev/nul');
   func();
}