[3/3] linux: Add 64-bit time_t support for wait3

  It basically calls the 64-bit time_t wait4 internal symbol.

Checked on x86_64-linux-gnu and i686-linux-gnu.
---
 include/sys/resource.h          |  4 +++
 sysdeps/unix/sysv/linux/wait3.c | 44 +++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/wait3.c
  

On Thu, Oct 15, 2020 at 6:06 AM Adhemerval Zanella
<adhemerval.zanella@linaro.org> wrote:
>
> It basically calls the 64-bit time_t wait4 internal symbol.
>
> Checked on x86_64-linux-gnu and i686-linux-gnu.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  include/sys/resource.h          |  4 +++
>  sysdeps/unix/sysv/linux/wait3.c | 44 +++++++++++++++++++++++++++++++++
>  2 files changed, 48 insertions(+)
>  create mode 100644 sysdeps/unix/sysv/linux/wait3.c
>
> diff --git a/include/sys/resource.h b/include/sys/resource.h
> index 64925f257c..2235b020fc 100644
> --- a/include/sys/resource.h
> +++ b/include/sys/resource.h
> @@ -138,12 +138,16 @@ libc_hidden_proto (__setrlimit);
>  #if __TIMESIZE == 64
>  # define __getrusage64 __getrusage
>  # define __wait4_time64 __wait4
> +# define __wait3_time64 __wait3
>  #else
>  extern int __getrusage64 (enum __rusage_who who, struct __rusage64 *usage);
>  libc_hidden_proto (__getrusage64)
>  extern pid_t __wait4_time64 (pid_t pid, int *stat_loc, int options,
>                               struct __rusage64 *usage);
>  libc_hidden_proto (__wait4_time64)
> +extern pid_t __wait3_time64 (int *stat_loc, int options,
> +                             struct __rusage64 *usage);
> +libc_hidden_proto (__wait3_time64)
>  #endif
>  #endif
>  #endif
> diff --git a/sysdeps/unix/sysv/linux/wait3.c b/sysdeps/unix/sysv/linux/wait3.c
> new file mode 100644
> index 0000000000..c05776f7ab
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/wait3.c
> @@ -0,0 +1,44 @@
> +/* Wait for process to change state, BSD style.  Linux version.
> +   Copyright (C) 2020 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
> +   <https://www.gnu.org/licenses/>.  */
> +
> +#include <sys/wait.h>
> +#include <sys/resource.h>
> +#include <sys/types.h>
> +
> +pid_t
> +__wait3_time64 (int *stat_loc, int options, struct __rusage64 *usage)
> +{
> +  return __wait4_time64 (WAIT_ANY, stat_loc, options, usage);
> +}
> +#if __TIMESIZE != 64
> +libc_hidden_def (__wait3_time64)
> +
> +pid_t
> +__wait3 (int *stat_loc, int options, struct rusage *usage)
> +{
> +  struct __rusage64 usage64;
> +  pid_t ret = __wait3_time64 (stat_loc, options,
> +                             usage != NULL ? &usage64 : NULL);
> +  if (ret > 0 && usage != NULL)
> +     rusage64_to_rusage (&usage64, usage);
> +
> +  return ret;
> +}
> +#endif
> +
> +weak_alias (__wait3, wait3)
> --
> 2.25.1
>
  

Hi Adhemerval,

> It basically calls the 64-bit time_t wait4 internal symbol.
> 
> Checked on x86_64-linux-gnu and i686-linux-gnu.
> ---
>  include/sys/resource.h          |  4 +++
>  sysdeps/unix/sysv/linux/wait3.c | 44
> +++++++++++++++++++++++++++++++++ 2 files changed, 48 insertions(+)
>  create mode 100644 sysdeps/unix/sysv/linux/wait3.c
> 
> diff --git a/include/sys/resource.h b/include/sys/resource.h
> index 64925f257c..2235b020fc 100644
> --- a/include/sys/resource.h
> +++ b/include/sys/resource.h
> @@ -138,12 +138,16 @@ libc_hidden_proto (__setrlimit);
>  #if __TIMESIZE == 64
>  # define __getrusage64 __getrusage
>  # define __wait4_time64 __wait4
> +# define __wait3_time64 __wait3
>  #else
>  extern int __getrusage64 (enum __rusage_who who, struct __rusage64
> *usage); libc_hidden_proto (__getrusage64)
>  extern pid_t __wait4_time64 (pid_t pid, int *stat_loc, int options,
>                               struct __rusage64 *usage);
>  libc_hidden_proto (__wait4_time64)
> +extern pid_t __wait3_time64 (int *stat_loc, int options,
> +                             struct __rusage64 *usage);
> +libc_hidden_proto (__wait3_time64)
>  #endif
>  #endif
>  #endif
> diff --git a/sysdeps/unix/sysv/linux/wait3.c
> b/sysdeps/unix/sysv/linux/wait3.c new file mode 100644
> index 0000000000..c05776f7ab
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/wait3.c
> @@ -0,0 +1,44 @@
> +/* Wait for process to change state, BSD style.  Linux version.
> +   Copyright (C) 2020 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
> +   <https://www.gnu.org/licenses/>.  */
> +
> +#include <sys/wait.h>
> +#include <sys/resource.h>
> +#include <sys/types.h>
> +
> +pid_t
> +__wait3_time64 (int *stat_loc, int options, struct __rusage64 *usage)
> +{
> +  return __wait4_time64 (WAIT_ANY, stat_loc, options, usage);
> +}
> +#if __TIMESIZE != 64
> +libc_hidden_def (__wait3_time64)
> +
> +pid_t
> +__wait3 (int *stat_loc, int options, struct rusage *usage)
> +{
> +  struct __rusage64 usage64;
> +  pid_t ret = __wait3_time64 (stat_loc, options,
> +			      usage != NULL ? &usage64 : NULL);
> +  if (ret > 0 && usage != NULL)
> +     rusage64_to_rusage (&usage64, usage);
> +
> +  return ret;
> +}
> +#endif
> +
> +weak_alias (__wait3, wait3)

Thanks for converting this.

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

Side comment:
-------------

Now, I've just realized that struct __rusage64 (defined in non-exported
header: include/sys/resource.h) also needs to be exported for proper
Y2038 support (the same case as with struct __stat64_t64).


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
  

On 16/10/2020 06:14, Lukasz Majewski wrote:
> Thanks for converting this.
> 
> Reviewed-by: Lukasz Majewski <lukma@denx.de>
> 
> Side comment:
> -------------
> 
> Now, I've just realized that struct __rusage64 (defined in non-exported
> header: include/sys/resource.h) also needs to be exported for proper
> Y2038 support (the same case as with struct __stat64_t64).

It should to enable getrusage, wait3, and wait4.  Although not really
related, I wonder if we should deprecate vtimes as well.
  

Hi Adhemerval,

> On 16/10/2020 06:14, Lukasz Majewski wrote:
> > Thanks for converting this.
> > 
> > Reviewed-by: Lukasz Majewski <lukma@denx.de>
> > 
> > Side comment:
> > -------------
> > 
> > Now, I've just realized that struct __rusage64 (defined in
> > non-exported header: include/sys/resource.h) also needs to be
> > exported for proper Y2038 support (the same case as with struct
> > __stat64_t64).  
> 
> It should to enable getrusage, wait3, and wait4. 

Yes, indeed.

> Although not really
> related, I wonder if we should deprecate vtimes as well. 
> 

As I've found following text in the vtimes/getrusage man page [1]:

"Ancient systems provided a vtimes() function with a similar purpose
to getrusage().  For backward compatibility, glibc also provides
vtimes().  All new applications should be written using getrusage()."

I think that we should. The Y2038 is a good occasion to do it (and
cleanup the glibc's code base) :-)


Links:
[1] - https://man7.org/linux/man-pages/man3/vtimes.3.html


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