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Message-ID: <20201227215734.GC22981@brightrain.aerifal.cx>
Date: Sun, 27 Dec 2020 16:57:34 -0500
From: Rich Felker <dalias@...ifal.cx>
To: Alexander Lobakin <alobakin@...me>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH 03/18] clock_adjtime: try adjtimex at last
On Sun, Dec 27, 2020 at 06:41:02PM +0000, Alexander Lobakin wrote:
> Try to use deprecated adjtimex only after clock_adjtime_time64 or
> clock_adjtime fail with -ENOSYS.
>
> Signed-off-by: Alexander Lobakin <alobakin@...me>
> ---
> src/linux/clock_adjtime.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/src/linux/clock_adjtime.c b/src/linux/clock_adjtime.c
> index d4d03d24df40..5a21d5625e59 100644
> --- a/src/linux/clock_adjtime.c
> +++ b/src/linux/clock_adjtime.c
> @@ -114,11 +114,11 @@ int clock_adjtime (clockid_t clock_id, struct timex *utx)
> .stbcnt = utx->stbcnt,
> .tai = utx->tai,
> };
> + r = __syscall(SYS_clock_adjtime, clock_id, &ktx);
> #ifdef SYS_adjtimex
> - if (clock_id==CLOCK_REALTIME) r = __syscall(SYS_adjtimex, &ktx);
> - else
> + if (r == -ENOSYS && clock_id == CLOCK_REALTIME)
> + r = __syscall(SYS_adjtimex, &ktx);
> #endif
> - r = __syscall(SYS_clock_adjtime, clock_id, &ktx);
> if (r>=0) {
> utx->modes = ktx.modes;
> utx->offset = ktx.offset;
> @@ -144,8 +144,10 @@ int clock_adjtime (clockid_t clock_id, struct timex *utx)
> }
> return __syscall_ret(r);
> }
> + r = __syscall(SYS_clock_adjtime, clock_id, utx);
> #ifdef SYS_adjtimex
> - if (clock_id==CLOCK_REALTIME) return syscall(SYS_adjtimex, utx);
> + if (r == -ENOSYS && clock_id == CLOCK_REALTIME)
> + r = __syscall(SYS_adjtimex, utx);
> #endif
> - return syscall(SYS_clock_adjtime, clock_id, utx);
> + return __syscall_ret(r);
> }
> --
> 2.29.2
>
This proposed change seems to have nothing to do with supporting
CONFIG_COMPAT_32BIT_TIME=n and makes fallback behavior strictly worse
for old kernels.
Rich
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