Subject: Re: ENXIO or ENODEV when r-opening a w-only device?
To: None <tech-kern@NetBSD.org>
From: Chapman Flack <nblists@anastigmatix.net>
List: tech-kern
Date: 01/04/2006 20:13:27
Steven M. Bellovin wrote:
> What do you get if you open a device on a read-only file system for
Umm, EROFS. But again, that has kind of a specific meaning that
isn't what I mean.
> writing? A CD-Ro for writing? I'd return the same error.
I put a cd into cd0, and open("/dev/rcd0a",O_WRONLY) succeeded. :/
Then write(2) returned ... EINVAL. EINVAL? I had my money on
ENXIO. :)
man 2 write:
[EINVAL] The pointer associated with d was negative.
[EINVAL] The total length of the I/O is more than can be
expressed by the ssize_t return value.
SUS:
The write() and pwrite() functions may fail if:
[EINVAL]
The STREAM or multiplexer referenced by fildes is linked
(directly or indirectly) downstream from a multiplexer.
The more I think about this, the less I seem to understand. I
think I expected the question to be easier, more settled-like. :)
-Chap