linux-kernel - Re: [PATCH] tools/nolibc: add support for clock

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Message-ID: <20250706062633.GB29601@1wt.eu>
Date: Sun, 6 Jul 2025 08:26:33 +0200
From: Willy Tarreau <w@....eu>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Thomas Weißschuh <linux@...ssschuh.net>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH] tools/nolibc: add support for clock_nanosleep() and
 nanosleep()

Hi Thomas,

On Fri, Jul 04, 2025 at 04:19:48PM +0200, Thomas Weißschuh wrote:
> +static __attribute__((unused))
> +int sys_clock_nanosleep(clockid_t clockid, int flags, const struct timespec *rqtp,
> +			struct timespec *rmtp)
> +{
> +#if defined(__NR_clock_nanosleep)
> +	return my_syscall4(__NR_clock_nanosleep, clockid, flags, rqtp, rmtp);
> +#elif defined(__NR_clock_nanosleep_time64)
> +	struct __kernel_timespec krqtp, krmtp;
> +	int ret;
> +
> +	__nolibc_timespec_user_to_kernel(rqtp, &krqtp);
> +	ret = my_syscall4(__NR_clock_nanosleep_time64, clockid, flags, &krqtp, &krmtp);
> +	if (rmtp)
> +		__nolibc_timespec_kernel_to_user(&krmtp, rmtp);
> +	return ret;
> +#else
> +	return __nolibc_enosys(__func__, clockid, flags, rqtp, rmtp);
> +#endif

I don't know which archs do not have clock_nanosleep, but if it becomes
needed on some of them, we could probably fall back to pslelect() if
available, of course, and ignore the clockid.

Acked-by: Willy Tarreau <w@....eu>

Cheers,
Willy