Fix epmd's dbg_perror() output

Holger Weiß <>
Wed Nov 17 16:45:37 CET 2010

When epmd prints an error message via dbg_perror(), the dbg_gen_printf()
function is supposed to append the error message which corresponds to
the current errno value. The following commit fixes the problem that
errno has been reset to zero (by erts_snprintf()) before it is used:

    git fetch git:// fix-epmd-perror

The problem can easily be reproduced by executing e.g.

    epmd -port 42

as an unprivileged user. Without the patch, this will spit out something
along the lines of:

    epmd: Wed Nov 17 16:44:22 2010: failed to bind socket: Success


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