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Re: ioctl: FIONREAD and ENOTTY
On Wed, 2011-07-20 at 17:46 +0200, Corinna Vinschen wrote:
> On Jul 20 03:11, Yaakov (Cygwin/X) wrote:
> > On Linux, ioctl(2) returns several different errors[1]:
> >
> > EBADF d is not a valid descriptor.
> > EFAULT argp references an inaccessible memory area.
> > EINVAL Request or argp is not valid.
> > ENOTTY d is not associated with a character special device.
> > ENOTTY The specified request does not apply to the kind of object that
> > the descriptor d references.
> >
> > In the case of FIONREAD, Cygwin doesn't seem to distinguish between
> > EINVAL and ENOTTY, and this causes at least one major bug:
> >
> > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35536
> >
> > I have patched GCJ and GNU classpath to work around it, but this really
> > needs to be fixed in Cygwin itself.
>
> Would this patch be sufficient?
>
> Index: fhandler.cc
> ===================================================================
> RCS file: /cvs/src/src/winsup/cygwin/fhandler.cc,v
> retrieving revision 1.397
> diff -u -p -r1.397 fhandler.cc
> --- fhandler.cc 5 Jul 2011 12:02:10 -0000 1.397
> +++ fhandler.cc 20 Jul 2011 15:46:40 -0000
> @@ -1151,6 +1151,10 @@ fhandler_base::ioctl (unsigned int cmd,
> set_nonblocking (*(int *) buf);
> res = 0;
> break;
> + case FIONREAD:
> + set_errno (ENOTTY);
> + res = -1;
> + break;
> default:
> set_errno (EINVAL);
> res = -1;
Given my testcases, give me a few days to check this out.
Yaakov
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