The function ioctl bug

The function ioctl bug

[Бабенко Вячеслав]

Dear friends!

The function ioctl return -1 (errno equal 95) if I use cygwin-x86_64. See my code:
...
int fd = socket(AF_INET, SOCK_STREAM, 0);
if (ioctl(fd, FIONREAD, &c) == -1)
    printf("%u", errno);
...
The function ioctl return 0 if I use cygwin-x86.


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

Re: The function ioctl bug

[Marco Atzeri]

On 01/07/2016 07:21, Бабенко Вячеслав wrote:
> Dear friends!
>
> The function ioctl return -1 (errno equal 95) if I use cygwin-x86_64. See my code:
> ...
> int fd = socket(AF_INET, SOCK_STREAM, 0);
> if (ioctl(fd, FIONREAD, &c) == -1)
>     printf("%u", errno);
> ...
> The function ioctl return 0 if I use cygwin-x86.
>
>

the test case must be a complete minimal program that anyone could build.



--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

Re: The function ioctl bug

[Corinna Vinschen]

[-- Attachment #1: Type: text/plain, Size: 1187 bytes --]

Hi Viacheslav,

On Jul  1 23:38, Бабенко Вячеслав wrote:
> Dear friends!
> 
> The function ioctl return -1 (errno equal 95) if I use cygwin-x86_64 but return 0 if I use cygwin-x86.
> 
> #include <stdio.h>
> #include <sys/socket.h>
> #include <sys/ioctl.h>
> #include <unistd.h>
> #include <errno.h>
> 
> int main()
> {
>     int c;
>     int fd = socket(AF_INET, SOCK_STREAM, 0);
>     if (ioctl(fd, FIONREAD, &c) == -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

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

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 819 bytes --]

Re: The function ioctl bug

[Бабенко Вячеслав]

Dear friends!

The function ioctl return -1 (errno equal 95) if I use cygwin-x86_64 but return 0 if I use cygwin-x86.

#include <stdio.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <errno.h>

int main()
{
    int c;
    int fd = socket(AF_INET, SOCK_STREAM, 0);
    if (ioctl(fd, FIONREAD, &c) == -1)
        printf("errno:%u\n", errno);
    close(fd);
    return 0;
}

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple