Provided by: allegro5-doc_5.2.9.1+dfsg-1.1build4_all bug

NAME
       al_get_errno - Allegro 5 API


SYNOPSIS
              int al_get_errno(void)
              GETTER(allegro_errno, 0)


DESCRIPTION
       Some  Allegro  functions will set an error number as well as returning an error code.  Call this function
       to retrieve the last error number set for the calling thread.

Allegro reference manual                                                                   al_get_errno(3alleg5)