Check if libkrb5 understands a realm

realm.c

// gcc -g realm.c -o realm -lkrb5
// HOST=XXX.LOC ./realm
#include <stdlib.h>
#include <stdio.h>
#include <krb5/krb5.h>

int main(){
	// nfs-utils/utils/gssd/krb5_util.c, find_keytab_entry()
	krb5_error_code test;
	krb5_context context;
	krb5_init_context(&context);
	char **realmnames = NULL;
	const char *host = getenv("HOST");
	test = krb5_get_host_realm(context, host, &realmnames);
	printf("%s\n", realmnames[0]);
}