mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-28 23:34:53 +03:00
5f85cc2f47
The LFS support is implemented on fxstat64.c, instead of fxstat.c for
64-bit architectures. The fxstatat.c implements the non-LFS and it is
a no-op for !XSTAT_IS_XSTAT64.
The generic non-LFS implementation handles two cases:
1. New kABIs which uses generic pre 64-bit time Linux ABI (csky and
nios): it issues __NR_fstatat64 plus handle the overflow on st_ino,
st_size, or st_blocks. It only handles _STAT_VER_KERNEL.
2. Old kABIs with old non-LFS support (arm, i386, hppa, m68k, mips32,
microblaze, s390, sh, powerpc, and sparc32). it issues
__NR_fstatat64 and convert to non-LFS stat struct based on the
version.
Also non-LFS mips64 is an outlier and it has its own implementation
since _STAT_VER_LINUX requires a different conversion function (it
uses the kernel_stat as the sysissues argument since its exported ABI
is different than the kernel one for both non-LFS and LFS
implementation).
The generic LFS implementation handles multiple cases:
1. XSTAT_IS_XSTAT64 being 1:
1.1. 64-bit kABI (aarch64, ia64, powerpc64*, s390x, riscv64, and
x86_64): it issues __NR_newfstatat for _STAT_VER_KERNEL or
_STAT_VER_LINUX.
1.2. 64-bit kABI outlier (sparc64): it issuess fstatat64 with a
temporary stat64 and convert to output stat64 based on the
input version (and using a sparc64 specific __xstat32_conv).
1.3. New 32-bit kABIs with only 64-bit time_t support (arc and
riscv32): it issues __NR_statx and covert to struct stat64.
2. Old ABIs with XSTAT_IS_XSTAT64 being 0 (arm, csky, i386, hppa, m68k,
microblaze, mips32, nios2, sh, powerpc32, and sparc32): it issues
__NR_fstat64.
Also, two special cases requires specific implementations:
1. alpha: it uses the __NR_fstatat64 syscall instead.
2. mips64: as for non-LFS implementation its ABIs differ from
glibc exported one, which requires an specific conversion
function to handle the kernel_stat.
Checked with a build for all affected ABIs. I also checked on x86_64,
i686, powerpc, powerpc64le, sparcv9, sparc64, s390, and s390x.
Reviewed-by: Lukasz Majewski <lukma@denx.de>
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/* fxstatat used on fstatat, Linux implementation.
|
|
Copyright (C) 2005-2020 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/stat.h>
|
|
#include <fcntl.h>
|
|
#include <kernel_stat.h>
|
|
#include <sysdep.h>
|
|
|
|
#if !XSTAT_IS_XSTAT64
|
|
# include <xstatconv.h>
|
|
# include <xstatover.h>
|
|
|
|
/* Get information about the file FD in BUF. */
|
|
int
|
|
__fxstatat (int vers, int fd, const char *file, struct stat *st, int flag)
|
|
{
|
|
#if STAT_IS_KERNEL_STAT
|
|
/* New kABIs which uses generic pre 64-bit time Linux ABI, e.g.
|
|
csky, nios2 */
|
|
if (vers == _STAT_VER_KERNEL)
|
|
{
|
|
int r = INLINE_SYSCALL_CALL (fstatat64, fd, file, st, flag);
|
|
return r ?: stat_overflow (st);
|
|
}
|
|
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
|
|
#else
|
|
/* Old kABIs with old non-LFS support, e.g. arm, i386, hppa, m68k, mips32,
|
|
microblaze, s390, sh, powerpc32, and sparc32. */
|
|
struct stat64 st64;
|
|
int r = INLINE_SYSCALL_CALL (fstatat64, fd, file, &st64, flag);
|
|
return r ?: __xstat32_conv (vers, &st64, st);
|
|
#endif
|
|
}
|
|
libc_hidden_def (__fxstatat)
|
|
|
|
#endif /* XSTAT_IS_XSTAT64 */
|