netdev - Re: [PATCH glibc] Linux: Include <linux/sockios.h> in <bits/socket.h> under __USE

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Message-ID: <086e5147-5bc7-2817-f295-357cb9a071ae@arm.com>
Date:   Mon, 22 Jul 2019 13:47:58 +0000
From:   Szabolcs Nagy <Szabolcs.Nagy@....com>
To:     Florian Weimer <fweimer@...hat.com>
CC:     nd <nd@....com>, Arnd Bergmann <arnd@...db.de>,
        GNU C Library <libc-alpha@...rceware.org>,
        Sergei Trofimovich <slyfox@...too.org>,
        Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        linux-man <linux-man@...r.kernel.org>
Subject: Re: [PATCH glibc] Linux: Include <linux/sockios.h> in <bits/socket.h>
 under __USE_MISC

On 22/07/2019 14:44, Florian Weimer wrote:
> * Szabolcs Nagy:
> 
>> (note: in musl these ioctl macros are in sys/ioctl.h
>> which is not a posix header so namespace rules are
>> less strict than for sys/socket.h and users tend to
>> include it for ioctl())
> 
> <sys/ioctl.h> can be confusing because some of the constants may depend
> on types that aren't declared by including the header.  This makes their
> macros unusable.  Defining ioctl constants in headers which also provide
> the matching types avoids that problem at least, also it can introduce
> namespace issues.

yeah, the way we deal with that is we hard code the numbers
since the size of struct is abi, they cannot change.