On Tue, 15 Apr 2014 15:42:54 +0200
Emmanuel Colbus <[email protected]> wrote:
> Continuing with syscalls, I would like to indicate you a modification
> I've done with regards to ioctl's. The thing is, I have had the need for
> ioctl's that return *file descriptors*, instead of standard return codes.
You probably only think you have ;-)
The return from an ioctl on 32bit is going to be an unsigned 32bit value,
as is a Linux file handle. So if you do
fd = ioctl(foo);
then not only have you got an interface that isn't compliant with
POSIX/SuS you also have no error reporting capability.
The expectation of ioctl is
err = ioctl(fd, FDIOWIBBLE, &result);
now if result is a pointer to where to store one or more file handles you
are sorted.
If you are going to use SuS/POSIX naming I'd really suggest sticking to
the expected behaviour in the standards.
Alan
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