linux-kernel - Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64

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Message-ID: <fb57172d-9268-6aaf-1ba1-fa42a2a47c03@gmail.com>
Date:   Wed, 24 Nov 2021 11:17:28 +0100
From:   "Alejandro Colomar (man-pages)" <alx.manpages@...il.com>
To:     Florian Weimer <fweimer@...hat.com>, Cyril Hrubis <chrubis@...e.cz>
Cc:     linux-arch <linux-arch@...r.kernel.org>,
        GNU C Library <libc-alpha@...rceware.org>,
        Linux API <linux-api@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        LTP List <ltp@...ts.linux.it>
Subject: Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace

On 11/23/21 20:50, Florian Weimer via Libc-alpha wrote:
> * Cyril Hrubis:
> 
>> As far as I can tell the userspace bits/types.h does exactly the same
>> check in order to define uint64_t and int64_t, i.e.:
>>
>> #if __WORDSIZE == 64
>> typedef signed long int __int64_t;
>> typedef unsigned long int __uint64_t;
>> #else
>> __extension__ typedef signed long long int __int64_t;
>> __extension__ typedef unsigned long long int __uint64_t;
>> #endif
>>
>> The macro __WORDSIZE is defined per architecture, and it looks like the
>> defintions in glibc sources in bits/wordsize.h match the uapi
>> asm/bitsperlong.h. But I may have missed something, the code in glibc is
>> not exactly easy to read.
> 
> __WORDSIZE isn't exactly a standard libc macro.

The (to-be) standard libc macro would be LONG_WIDTH (although it has a 
slightly different meaning, but it can be used for this, but then the 
code also needs to expose <limits.h>), rigth?

Regards,
Alex

-- 
Alejandro Colomar
Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/