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Date:	Fri, 15 Mar 2019 14:42:47 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: sshd: fatal: seteuid XXX : No such device or address
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On Mar 15 14:06, Houder wrote:
> On Thu, 14 Mar 2019 18:29:18, Corinna Vinschen  wrote:
>=20
> > On Mar 14 16:53, Houder wrote:
>=20
> > > On Thu, 14 Mar 2019 12:39:30, XXXXX wrote:
> > > > Hello the list
> [snip]
> > > > sshd: PID 3777: fatal: seteuid 1049076: No such device or address
>=20
> > > Corinna,
> > >
> > > As far as I know, seteuid() can either return EINVAL or EPERM in case=
 of
> > > an error.
> > >
> > > EPERM (=3D3D  1) "Operation not permitted"
> > > EINVAL(=3D3D 22) "Invalid argument"
> > >
> > > "No such device or address" appears to correspond to ENXIO (=3D3D  6)=
. Is it
> > > sshd, or is it Cygwin, that is confused here?
> >=20
> > No confusion as such.  The underlying Windows function returns a NT
> > status code, which is converted to a Win32 error code by a Windows
> > function, and that Win32 error code is converted to a POSIX errno by
> > Cygwin.  There are much more NT status codes than Win32 error codes, and
> > there are much more Win32 error codses than POSIX errno values, so the
> > mapping is inevitably unsatisfying.
>=20
> .. yes, I am aware of the situation (winsup/cygwin/errno.cc) ...
>=20
> However, in the end this kind of error messages is of NOT much use in ord=
er
> to ascertain what is going on (i.e. what is causing the problem).
>=20
> One is forced to create the exact same environment (system) as the person
> who is complaining, fire up the debugger (like sticking a thermometer in a
> patient's rear end) in order to find out where the code failed ...
>=20
> Meaning, within the context of the recent sshd problems, possibly only you
> know where the error ERROR_FILE_INVALID (resulting in the error message "=
No
> such device or address") was generated ... (and by which Windows function=
).

The only interface an application has is by checking the POSIX
errno value.  This is what Cygwin is about :)

If you need more details what's going on under the hood, you have
to use strace.

> Oh well, this cannot be helped ...

Well, there *is* a solution by using strace.  And hey, we now know what
ENXIO returned from seteuid means, don't we?  It's not all bad :)


Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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