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Re: [libvirt] [Qemu-devel] [PATCH v4 3/7] qapi: Add pass-fd QMP command



On 06/25/2012 09:34 AM, Kevin Wolf wrote:
> Am 25.06.2012 16:51, schrieb Corey Bryant:
>> Thanks for catching this.  I'll fix this in v5.  In terms of platforms 
>> that support dup3 vs dup2, I'm assuming the following preprocessor 
>> checks will do what we need:
>>
>> #if defined(__linux__) || defined(__CYGWIN__)
>> dup3(fd, monfd->fd, O_CLOEXEC)
>> #else
>> dup2()+fcntl(F_GETFD/F_SETFD)
>> #endif
> 
> Checking for dup3() in configure might be the better option. It's not
> like it has been there forever, even on Linux.

Agreed.  Furthermore, since dup3() has been proposed for addition into
POSIX[1], it won't be long before other platforms add it.  Always favor
feature checks (a configure probe for dup3) over platform checks
(hard-coding the assumption that Linux and Cygwin are the only platforms
that will ever provide it).

[1] http://austingroupbugs.net/view.php?id=411

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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