Re: Java in OS?

Ulrich Windl (Ulrich.Windl@rz.uni-regensburg.de)
Mon, 6 May 1996 09:35:49 +0200


On 5 May 96 at 8:14, Matthias Urlichs wrote:

> In linux.dev.kernel, article <199605031507.QAA26975@snowcrash.cymru.n=
et>,
> Alan Cox <alan@cymru.net> writes:
> > > How would you specify where to find the interpreter? Compiled Ja=
va
> > > doesn't have comments, so you couldn't use the #!-style approach.
> >=20
> > You can add one to the front, you can also use something like the e=
lksemu
> > module that spots elks binaries by magic number, rewrites them to
> > allegedly have #! and passes them to the shell interpreter.
> >=20
> Or you can add a new loader. Use binfmt_scriptshell.c as the example =
to
> follow.=20
>=20
> NB: Why does trying to exec a script with an interpreter that is itse=
lf a
> script cause an error? Specifically, EPERM? I think that should be al=
lowed.
> (Yes I know, other Unixes frequently don't allow this, but that's no
> excuse.)
>=20
> /tmp/foo:
> #!/bin/sh
> echo "Did it"
>=20
> /tmp/bar:
> #!/tmp/foo
> # nothing interesting
>=20
> % chmod +x /tmp/foo /tmp/bar
> % /tmp/bar
> bash: ./bar: Permission denied
> %

Maybe because of
/tmp/bar:
#!/tmp/bar

(loop in the kernel)

>=20
> Hmmm...
>=20
> --=20
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42
>=20
>=20