DOKK / manpages / debian 11 / allegro4-doc / os_revision.3alleg4.en
os_version(3alleg4) Allegro manual os_version(3alleg4)

os_version, os_revision - Version of the OS currently running. Allegro game programming library.

#include <allegro.h>

extern int os_version;

extern int os_revision;

The major and minor version of the Operating System currently running. Set by allegro_init(). If Allegro for some reason was not able to retrieve the version of the Operating System, os_version and os_revision will be set to -1. For example: Under Win98 SE (v4.10.2222) os_version will be set to 4 and os_revision to 10.

os_type(3alleg4), os_multitasking(3alleg4)

version 4.4.3 Allegro