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X-HELO:	calimero.vinschen.de
Date:	Fri, 1 Jul 2016 17:10:11 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: The function ioctl bug
Message-ID:	<20160701151011.GB16421@calimero.vinschen.de>
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Hi Viacheslav,

On Jul  1 23:38, =D0=91=D0=B0=D0=B1=D0=B5=D0=BD=D0=BA=D0=BE =D0=92=D1=8F=D1=
=87=D0=B5=D1=81=D0=BB=D0=B0=D0=B2 wrote:
> Dear friends!
>=20
> The function ioctl return -1 (errno equal 95) if I use cygwin-x86_64 but =
return 0 if I use cygwin-x86.
>=20
> #include <stdio.h>
> #include <sys/socket.h>
> #include <sys/ioctl.h>
> #include <unistd.h>
> #include <errno.h>
>=20
> int main()
> {
>     int c;
>     int fd =3D socket(AF_INET, SOCK_STREAM, 0);
>     if (ioctl(fd, FIONREAD, &c) =3D=3D -1)
>         printf("errno:%u\n", errno);
>     close(fd);
>     return 0;
> }

My fault.  As result of a header change in newlib I also changed the
definition of FIONREAD and others in <asm/socket.h>, but failed to make
sure to call Winsock's ioctlsocket with the correctly specified Winsock
FIONREAD.  This only affects x86_64 as you noticed.

I applied a patch to fix this issue and uploaded new developer
snapshots to https://cygwin.com/snapshots/

(Note that recent snapshots don't work on XP and Server 2003 anymore)

Please give them a try.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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