[2/2] time: Add 64-bit time_t support for ftime

  It basically calls the 64-bit __clock_gettime64 and adds the overflow
check.

Checked on x86_64-linux-gnu and i686-linux-gnu.
---
 include/bits/types/struct_timeb.h |  1 +
 include/struct___timeb64.h        | 16 ++++++++++++++++
 include/sys/timeb.h               | 12 ++++++++++++
 time/Makefile                     |  2 +-
 time/bits/types/struct_timeb.h    | 15 +++++++++++++++
 time/ftime.c                      | 28 ++++++++++++++++++++++++----
 time/sys/timeb.h                  | 12 +-----------
 7 files changed, 70 insertions(+), 16 deletions(-)
 create mode 100644 include/bits/types/struct_timeb.h
 create mode 100644 include/struct___timeb64.h
 create mode 100644 time/bits/types/struct_timeb.h
  

Hi Adhemerval,

> It basically calls the 64-bit __clock_gettime64 and adds the overflow
> check.
> 
> Checked on x86_64-linux-gnu and i686-linux-gnu.
> ---
>  include/bits/types/struct_timeb.h |  1 +
>  include/struct___timeb64.h        | 16 ++++++++++++++++
>  include/sys/timeb.h               | 12 ++++++++++++
>  time/Makefile                     |  2 +-
>  time/bits/types/struct_timeb.h    | 15 +++++++++++++++
>  time/ftime.c                      | 28 ++++++++++++++++++++++++----
>  time/sys/timeb.h                  | 12 +-----------
>  7 files changed, 70 insertions(+), 16 deletions(-)
>  create mode 100644 include/bits/types/struct_timeb.h
>  create mode 100644 include/struct___timeb64.h
>  create mode 100644 time/bits/types/struct_timeb.h
> 
> diff --git a/include/bits/types/struct_timeb.h
> b/include/bits/types/struct_timeb.h new file mode 100644
> index 0000000000..fef74d2f44
> --- /dev/null
> +++ b/include/bits/types/struct_timeb.h
> @@ -0,0 +1 @@
> +#include <time/bits/types/struct_timeb.h>
> diff --git a/include/struct___timeb64.h b/include/struct___timeb64.h
> new file mode 100644
> index 0000000000..14704a9e30
> --- /dev/null
> +++ b/include/struct___timeb64.h
> @@ -0,0 +1,16 @@
> +#ifndef _STRUCT_TIMEB64_H
> +#define _STRUCT_TIMEB64_H
> +
> +#if __TIMESIZE == 64
> +# define __timeb64 timeb
> +#else
> +struct __timeb64
> +{
> +  __time64_t time;
> +  unsigned short int millitm;
> +  short int timezone;
> +  short int dstflag;
> +};
> +#endif
> +
> +#endif /* _STRUCT_TIMEB64_H  */
> diff --git a/include/sys/timeb.h b/include/sys/timeb.h
> index 9f4509c35e..2b01dafea7 100644
> --- a/include/sys/timeb.h
> +++ b/include/sys/timeb.h
> @@ -1 +1,13 @@
>  #include <time/sys/timeb.h>
> +
> +#ifndef _ISOMAC
> +# if __TIMESIZE == 64
> +#  define __timeb64  timeb
> +#  define __ftime64  ftime
> +# else
> +#  include <struct___timeb64.h>
> +
> +extern int __ftime64 (struct __timeb64 *) __nonnull ((1));
> +libc_hidden_proto (__ftime64);
> +# endif
> +#endif
> diff --git a/time/Makefile b/time/Makefile
> index a4fb13d6a3..26aa835166 100644
> --- a/time/Makefile
> +++ b/time/Makefile
> @@ -27,7 +27,7 @@ headers := time.h sys/time.h sys/timeb.h
> bits/time.h			\
> bits/types/struct_itimerspec.h				\
> bits/types/struct_timespec.h bits/types/struct_timeval.h	\
> bits/types/struct_tm.h bits/types/timer_t.h			\
> -	   bits/types/time_t.h
> +	   bits/types/time_t.h bits/types/struct_timeb.h
>  
>  routines := offtime asctime clock ctime ctime_r difftime \
>  	    gmtime localtime mktime time		 \
> diff --git a/time/bits/types/struct_timeb.h
> b/time/bits/types/struct_timeb.h new file mode 100644
> index 0000000000..1fe60c7131
> --- /dev/null
> +++ b/time/bits/types/struct_timeb.h
> @@ -0,0 +1,15 @@
> +#ifndef __timeb_defined
> +#define __timeb_defined 1
> +
> +#include <bits/types/time_t.h>
> +
> +/* Structure returned by the 'ftime' function.  */
> +struct timeb
> +  {
> +    time_t time;		/* Seconds since epoch, as from
> 'time'.  */
> +    unsigned short int millitm;	/* Additional milliseconds.
> */
> +    short int timezone;		/* Minutes west of GMT.  */
> +    short int dstflag;		/* Nonzero if Daylight Savings
> Time used.  */
> +  };
> +
> +#endif
> diff --git a/time/ftime.c b/time/ftime.c
> index ec88d9963f..a99070d3e0 100644
> --- a/time/ftime.c
> +++ b/time/ftime.c
> @@ -20,13 +20,13 @@
>  #undef __GLIBC_USE_DEPRECATED_FTIME
>  #define __GLIBC_USE_DEPRECATED_FTIME 1
>  #include <sys/timeb.h>
> -#include <time.h>
> +#include <errno.h>
>  
>  int
> -ftime (struct timeb *timebuf)
> +__ftime64 (struct __timeb64 *timebuf)
>  {
> -  struct timespec ts;
> -  __clock_gettime (CLOCK_REALTIME, &ts);
> +  struct __timespec64 ts;
> +  __clock_gettime64 (CLOCK_REALTIME, &ts);
>  
>    timebuf->time = ts.tv_sec;
>    timebuf->millitm = ts.tv_nsec / 1000000;
> @@ -34,3 +34,23 @@ ftime (struct timeb *timebuf)
>    timebuf->dstflag = 0;
>    return 0;
>  }
> +#if __TIMESIZE != 64
> +libc_hidden_def (__ftime64)
> +
> +int
> +ftime (struct timeb *timebuf)
> +{
> +  struct __timeb64 tb64;
> +  __ftime64 (&tb64);
> +  if (! in_time_t_range (tb64.time))
> +    {
> +      __set_errno (EOVERFLOW);
> +      return -1;
> +    }
> +  timebuf->time = tb64.time;
> +  timebuf->millitm = tb64.millitm;
> +  timebuf->timezone = tb64.timezone;
> +  timebuf->dstflag = tb64.dstflag;
> +  return 0;
> +}
> +#endif
> diff --git a/time/sys/timeb.h b/time/sys/timeb.h
> index be7b46c178..3f44abe55e 100644
> --- a/time/sys/timeb.h
> +++ b/time/sys/timeb.h
> @@ -20,21 +20,11 @@
>  
>  #include <features.h>
>  
> -#include <bits/types/time_t.h>
> -
>  __BEGIN_DECLS
>  
>  #if __GLIBC_USE (DEPRECATED_FTIME)
>  
> -/* Structure returned by the `ftime' function.  */
> -
> -struct timeb
> -  {
> -    time_t time;		/* Seconds since epoch, as from
> `time'.  */
> -    unsigned short int millitm;	/* Additional milliseconds.
> */
> -    short int timezone;		/* Minutes west of GMT.  */
> -    short int dstflag;		/* Nonzero if Daylight Savings
> Time used.  */
> -  };
> +# include <bits/types/struct_timeb.h>
>  
>  /* Fill in TIMEBUF with information about the current time.  */
>  

Reviewed-by: Lukasz Majewski <lukma@denx.de>


Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de
  

The build of the 64-bit ftime appears broken for Hurd:

ftime.c: In function '__ftime64':
ftime.c:27:3: error: implicit declaration of function '__clock_gettime64' [-Werror=implicit-function-declaration]
   27 |   __clock_gettime64 (CLOCK_REALTIME, &ts);
      |   ^~~~~~~~~~~~~~~~~
ftime.c:27:22: error: 'CLOCK_REALTIME' undeclared (first use in this function)
   27 |   __clock_gettime64 (CLOCK_REALTIME, &ts);
      |                      ^~~~~~~~~~~~~~
ftime.c:27:22: note: each undeclared identifier is reported only once for each function it appears in
ftime.c: In function 'ftime':
ftime.c:43:9: error: implicit declaration of function 'in_time_t_range'; did you mean 'in_ino_t_range'? [-Werror=implicit-function-declaration]
   43 |   if (! in_time_t_range (tb64.time))
      |         ^~~~~~~~~~~~~~~
      |         in_ino_t_range

https://sourceware.org/pipermail/libc-testresults/2020q4/006962.html
  

On 27/10/2020 14:38, Joseph Myers wrote:
> The build of the 64-bit ftime appears broken for Hurd:
> 
> ftime.c: In function '__ftime64':
> ftime.c:27:3: error: implicit declaration of function '__clock_gettime64' [-Werror=implicit-function-declaration]
>    27 |   __clock_gettime64 (CLOCK_REALTIME, &ts);
>       |   ^~~~~~~~~~~~~~~~~
> ftime.c:27:22: error: 'CLOCK_REALTIME' undeclared (first use in this function)
>    27 |   __clock_gettime64 (CLOCK_REALTIME, &ts);
>       |                      ^~~~~~~~~~~~~~
> ftime.c:27:22: note: each undeclared identifier is reported only once for each function it appears in
> ftime.c: In function 'ftime':
> ftime.c:43:9: error: implicit declaration of function 'in_time_t_range'; did you mean 'in_ino_t_range'? [-Werror=implicit-function-declaration]
>    43 |   if (! in_time_t_range (tb64.time))
>       |         ^~~~~~~~~~~~~~~
>       |         in_ino_t_range
> 
> https://sourceware.org/pipermail/libc-testresults/2020q4/006962.html
> 

I think we will need to make the y2038 ftime support Linux specific
for now, I will fix it.