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;
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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