[v2,03/10] Use clock_settime to implement stime; withdraw stime.

  Unconditionally, on all ports, use clock_settime to implement stime,
not settimeofday or a direct syscall.  Then convert stime into a
compatibility symbol and remove its prototype from time.h.

	* time/stime.c (stime): No longer a stub implementation.
	Call __clock_settime.  Demote to a compatibility symbol.

	* sysdeps/unix/stime.c: Delete file.
	* sysdeps/unix/sysv/linux/syscalls.list: Remove entry for stime.

	* time/time.h: Remove prototype for stime.
---
 sysdeps/unix/stime.c                  | 39 ---------------------------
 sysdeps/unix/sysv/linux/syscalls.list |  1 -
 time/stime.c                          | 25 ++++++++---------
 time/time.h                           |  6 -----
 4 files changed, 13 insertions(+), 58 deletions(-)
 delete mode 100644 sysdeps/unix/stime.c
  

On 28/08/2019 12:32, Zack Weinberg wrote:
> Unconditionally, on all ports, use clock_settime to implement stime,
> not settimeofday or a direct syscall.  Then convert stime into a
> compatibility symbol and remove its prototype from time.h.
> 
> 	* time/stime.c (stime): No longer a stub implementation.
> 	Call __clock_settime.  Demote to a compatibility symbol.
> 
> 	* sysdeps/unix/stime.c: Delete file.
> 	* sysdeps/unix/sysv/linux/syscalls.list: Remove entry for stime.
> 
> 	* time/time.h: Remove prototype for stime.

Should we add a NEW entry for this?

LGTM, thanks.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

> ---
>  sysdeps/unix/stime.c                  | 39 ---------------------------
>  sysdeps/unix/sysv/linux/syscalls.list |  1 -
>  time/stime.c                          | 25 ++++++++---------
>  time/time.h                           |  6 -----
>  4 files changed, 13 insertions(+), 58 deletions(-)
>  delete mode 100644 sysdeps/unix/stime.c
> 
> diff --git a/sysdeps/unix/stime.c b/sysdeps/unix/stime.c
> deleted file mode 100644
> index b0809be400..0000000000
> --- a/sysdeps/unix/stime.c
> +++ /dev/null
> @@ -1,39 +0,0 @@
> -/* Copyright (C) 1992-2019 Free Software Foundation, Inc.
> -   This file is part of the GNU C Library.
> -
> -   The GNU C Library is free software; you can redistribute it and/or
> -   modify it under the terms of the GNU Lesser General Public
> -   License as published by the Free Software Foundation; either
> -   version 2.1 of the License, or (at your option) any later version.
> -
> -   The GNU C Library is distributed in the hope that it will be useful,
> -   but WITHOUT ANY WARRANTY; without even the implied warranty of
> -   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> -   Lesser General Public License for more details.
> -
> -   You should have received a copy of the GNU Lesser General Public
> -   License along with the GNU C Library; if not, see
> -   <http://www.gnu.org/licenses/>.  */
> -
> -#include <errno.h>
> -#include <stddef.h>		/* For NULL.  */
> -#include <sys/time.h>
> -#include <time.h>
> -
> -/* Set the system clock to *WHEN.  */
> -
> -int
> -stime (const time_t *when)
> -{
> -  struct timeval tv;
> -
> -  if (when == NULL)
> -    {
> -      __set_errno (EINVAL);
> -      return -1;
> -    }
> -
> -  tv.tv_sec = *when;
> -  tv.tv_usec = 0;
> -  return __settimeofday (&tv, (struct timezone *) 0);
> -}

Ok.

> diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
> index cdcf6c127b..70b110979b 100644
> --- a/sysdeps/unix/sysv/linux/syscalls.list
> +++ b/sysdeps/unix/sysv/linux/syscalls.list
> @@ -61,7 +61,6 @@ setfsgid	EXTRA	setfsgid	i:i	setfsgid
>  setfsuid	EXTRA	setfsuid	i:i	setfsuid
>  setpgid		-	setpgid		i:ii	__setpgid	setpgid
>  sigaltstack	-	sigaltstack	i:PP	__sigaltstack	sigaltstack
> -stime		-	stime		i:p	stime
>  sysinfo		EXTRA	sysinfo		i:p	__sysinfo	sysinfo
>  swapon		-	swapon		i:si	__swapon	swapon
>  swapoff		-	swapoff		i:s	__swapoff	swapoff

Ok.

> diff --git a/time/stime.c b/time/stime.c
> index de58c49562..754e2da0b0 100644
> --- a/time/stime.c
> +++ b/time/stime.c
> @@ -15,23 +15,24 @@
>     License along with the GNU C Library; if not, see
>     <http://www.gnu.org/licenses/>.  */
>  
> -#include <errno.h>
> +#include <shlib-compat.h>
> +
> +#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_31)
> +
>  #include <time.h>
> -#include <stddef.h>
>  
>  /* Set the system clock to *WHEN.  */
>  
>  int
> -stime (const time_t *when)
> +attribute_compat_text_section
> +__stime (const time_t *when)
>  {
> -  if (when == NULL)
> -    {
> -      __set_errno (EINVAL);
> -      return -1;
> -    }
> -
> -  __set_errno (ENOSYS);
> -  return -1;
> +  struct timespec ts;
> +  ts.tv_sec = *when;
> +  ts.tv_nsec = 0;
> +
> +  return __clock_settime (CLOCK_REALTIME, &ts);
>  }
>  
> -stub_warning (stime)
> +compat_symbol (libc, __stime, stime, GLIBC_2_0);
> +#endif

Ok.

> diff --git a/time/time.h b/time/time.h
> index cba6d15260..57cfd4d330 100644
> --- a/time/time.h
> +++ b/time/time.h
> @@ -175,12 +175,6 @@ extern int daylight;
>  extern long int timezone;
>  #endif
>  
> -#ifdef __USE_MISC
> -/* Set the system time to *WHEN.
> -   This call is restricted to the superuser.  */
> -extern int stime (const time_t *__when) __THROW;
> -#endif
> -
>  
>  /* Nonzero if YEAR is a leap year (every 4 years,
>     except every 100th isn't, and every 400th is).  */
> 

Ok.