Re: [Qemu-devel] tun/tap patch for OSX

[Anthony Liguori <anthony@codemonkey.ws>]

Lev Lvovsky wrote:
> The following patch provided by Mattias Nissler, and tweaked by myself 
> to be applied to net.c (previously to vl.c) allows qemu to use the 
> tun/tap devices provided at Mattias' site 
> (http://tuntaposx.sourceforge.net).

Needs a valid Signed-off-by along with appropriate documentation 
pointing users to tuntaposx.

Regards,

Anthony Liguori

> Mattias is CC'd.
>
> thanks,
> -lev
>
> ----
> bash-3.2$ svn diff net.c
> Index: net.c
> ===================================================================
> --- net.c       (revision 6082)
> +++ net.c       (working copy)
> @@ -686,8 +686,36 @@
>      snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d", 
> fd);
>      return s;
>  }
> +#if defined(__APPLE__)
> +static int tap_open(char *ifname, int ifname_size)
> +{
> +    int fd;
> +    int i = 0;
> +    char *dev;
> +    char buf[20];
> +    struct stat s;
>
> -#if defined (_BSD) || defined (__FreeBSD_kernel__)
> +    while (1) {
> +        snprintf(buf, 20, "/dev/tap%d", i);
> +        fd = open(buf, O_RDWR);
> +        if (fd < 0) {
> +            if (errno != EBUSY) {
> +                fprintf(stderr, "warning: could not open %s: no 
> virtual network emulation\n", buf);
> +                return -1;
> +            }
> +            i++;
> +        } else
> +            break;
> +    }
> +
> +    fstat(fd, &s);
> +    dev = devname(s.st_rdev, S_IFCHR);
> +    pstrcpy(ifname, ifname_size, dev);
> +
> +    fcntl(fd, F_SETFL, O_NONBLOCK);
> +    return fd;
> +}
> +#elif defined (_BSD) || defined (__FreeBSD_kernel__)
>  static int tap_open(char *ifname, int ifname_size)
>  {
>      int fd;
>
>
>