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al_get_errno(3)                                                al_get_errno(3)

NAME
       al_get_errno - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              int al_get_errno(void)

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(3)