oberon-07-compiler/samples/linux/hello.ob07

MODULE Hello;

IMPORT SYSTEM, Libdl, Args;


VAR

    libc: INTEGER;
    puts: PROCEDURE [linux] (pStr: INTEGER);


PROCEDURE OutStringLn (s: ARRAY OF CHAR);
BEGIN
    puts(SYSTEM.ADR(s[0]))
END OutStringLn;


PROCEDURE main;
VAR
    i: INTEGER;
    s: ARRAY 80 OF CHAR;

BEGIN
    OutStringLn("Hello");

    OutStringLn("");
    i := 0;
    WHILE i < Args.argc DO
        Args.GetArg(i, s);
        INC(i);
        OutStringLn(s)
    END;

    OutStringLn("");
    i := 0;
    WHILE i < Args.envc DO
        Args.GetEnv(i, s);
        INC(i);
        OutStringLn(s)
    END;
    OutStringLn("");

    OutStringLn("Bye")
END main;


BEGIN
    libc := Libdl.open("libc.so.6", Libdl.LAZY);
    SYSTEM.PUT(SYSTEM.ADR(puts), Libdl.sym(libc, "puts"));
    ASSERT(puts # NIL);
    main
END Hello.