Provided by: allegro5-doc_5.2.10.1+dfsg-1build1_all 
NAME
al_set_errno - Allegro 5 API
SYNOPSIS
void al_set_errno(int errnum)
SETTER(allegro_errno, errnum)
DESCRIPTION
Set the error number for the calling thread.
Allegro reference manual al_set_errno(3alleg5)