UNSAFE MODULE TrestleOS;

IMPORT XClient, Uutmp, Uugid, Upwd, M3toC, Env;

VAR mu := NEW(MUTEX);
    inited := FALSE;

PROCEDURE Init () =
  BEGIN
    LOCK mu DO IF NOT inited THEN XClient.Init(); inited := TRUE END END
  END Init;

PROCEDURE UserName (): TEXT =
  VAR res: TEXT;
  BEGIN
    res := Env.Get("USER");
    IF res = NIL THEN
      VAR logname := Uutmp.getlogin();
      BEGIN
        IF logname # NIL THEN
          res := M3toC.CopyStoT(logname)
        ELSE
          VAR pwent := Upwd.getpwuid(Uugid.geteuid());
          BEGIN
            IF pwent # NIL THEN
              res := M3toC.CopyStoT(pwent.pw_name)
            ELSE
              res := "Unknown user"
            END
          END
        END
      END
    END;
    RETURN res
  END UserName;

BEGIN
END TrestleOS.