On 05/15/2018 11:16 AM, Anthony PERARD wrote:
+ errno = EOPNOTSUPP;
I think ENOSYS would be better. EOPNOTSUPP seems to be for sockets.
No, EOPNOTSUPP is more general than that and is convention for unimplemented
API operations elsewhere. ENOSYS is supposed to strictly mean 'system call not
implemented' but we use it for hypercalls in Xen, leading to occasional fun
with Linux checkpatch.pl.
In man errno, I have:
ENOTSUP Operation not supported (POSIX.1-2001)
EOPNOTSUPP Operation not supported on socket (POSIX.1-2001).
POSIX allows (and Linux exploits) ENOTSUP and EOPNOTSUPP to be synonyms
for the same error value. I somewhat prefer the ENOTSUP spelling; and
it's probably a bit nicer between the two when porting to platforms
where the two spellings are not synonyms.
ENOSYS Function not implemented (POSIX.1-2001).
But I guess any of these would work.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
