linux: Fix fstatat on MIPSn64 (BZ #29730)

  Commit 6e8a0aac2f883 ("time: Fix overflow itimer tests on 32-bit
systems") changed in_time_t_range to assume a 32-bit time_t. This broke
fstatat on MIPSn64 that was using it with a 64-bit time_t due to
difference between stat and stat64. This commit fix that by adding a
MIPSn64 specific version, which bypasses the EOVERFLOW tests.

Resolves: BZ #29730
---
 .../unix/sysv/linux/mips/mips64/n64/fstatat.c | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/mips/mips64/n64/fstatat.c

This is similar to patch "linux: Fix fstatat with !XSTAT_IS_XSTAT64 and
__TIMESIZE=64 (BZ #29730)", but using a separate file for MIPSn64
instead of #ifdef, as suggested by Adhemerval.
  

On 01/11/22 18:29, Aurelien Jarno wrote:
> Commit 6e8a0aac2f883 ("time: Fix overflow itimer tests on 32-bit
> systems") changed in_time_t_range to assume a 32-bit time_t. This broke
> fstatat on MIPSn64 that was using it with a 64-bit time_t due to
> difference between stat and stat64. This commit fix that by adding a
> MIPSn64 specific version, which bypasses the EOVERFLOW tests.
> 
> Resolves: BZ #29730

LGTM, thanks.

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

> ---
>  .../unix/sysv/linux/mips/mips64/n64/fstatat.c | 51 +++++++++++++++++++
>  1 file changed, 51 insertions(+)
>  create mode 100644 sysdeps/unix/sysv/linux/mips/mips64/n64/fstatat.c
> 
> This is similar to patch "linux: Fix fstatat with !XSTAT_IS_XSTAT64 and
> __TIMESIZE=64 (BZ #29730)", but using a separate file for MIPSn64
> instead of #ifdef, as suggested by Adhemerval.
> 
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/fstatat.c b/sysdeps/unix/sysv/linux/mips/mips64/n64/fstatat.c
> new file mode 100644
> index 0000000000..fe6c3a0dda
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/fstatat.c
> @@ -0,0 +1,51 @@
> +/* Get file status.  Linux/MIPSn64 version.
> +   Copyright (C) 2022 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/stat.h>
> +#include <sysdep.h>
> +
> +/* Different than other ABIs, mips64 has different layouts for non-LFS
> +   and LFS struct stat.  */
> +int
> +__fstatat (int fd, const char *file, struct stat *buf, int flag)
> +{
> +  struct __stat64_t64 st64;
> +  int r = __fstatat64_time64 (fd, file, &st64, flag);
> +  if (r == 0)
> +    {
> +      /* Clear internal pad and reserved fields.  */
> +      memset (buf, 0, sizeof (*buf));
> +
> +      buf->st_dev = st64.st_dev;
> +      buf->st_ino = st64.st_ino;
> +      buf->st_mode = st64.st_mode;
> +      buf->st_nlink = st64.st_nlink;
> +      buf->st_uid = st64.st_uid;
> +      buf->st_gid = st64.st_gid;
> +      buf->st_rdev = st64.st_rdev;
> +      buf->st_size = st64.st_size;
> +      buf->st_blksize = st64.st_blksize;
> +      buf->st_blocks  = st64.st_blocks;
> +      buf->st_atim = st64.st_atim;
> +      buf->st_mtim = st64.st_mtim;
> +      buf->st_ctim = st64.st_ctim;
> +    }
> +  return r;
> +}
> +
> +weak_alias (__fstatat, fstatat)