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6073bae64c
It implements all the required syscall for the all Linux kABIS on
fstatat{64} instead of calling fxstatat{64}.
On non-LFS implementation, it handles 3 cases:
1. New kABIs which uses generic pre 64-bit time Linux ABI (csky and
nios): it issues __NR_fstat64 plus handle the overflow on st_ino,
st_size, or st_blocks.
2. Old KABIs with old non-LFS support (arm, i386, hppa, m68k,
microblaze, mips32, s390, sh, powerpc, and sparc32): it issues
__NR_fstatat64 and convert the result to struct stat.
3. 64-bit kABI outliers (mips64 and mips64-n32): it issues
__NR_newfstatat and convert the result to struct stat.
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.
1.2. 64-bit kABI outlier (alpha): it issues __NR_fstatat64.
1.3. 64-bit kABI outlier where struct stat64 does not match kernel
one (sparc64): it issues __NR_fstatat64 and convert the result
to struct stat64.
1.4. 32-bit kABI with default 64-bit time_t (arc, riscv32): it
issues __NR_statx and convert the result to struct stat64.
2. Old ABIs with XSTAT_IS_XSTAT64 being 0:
2.1. All kABIs with non-LFS support (arm, csky, i386, hppa, m68k,
microblaze, nios2, sh, powerpc32, and sparc32): it issues
__NR_fstatat64.
2.2. 64-bit kABI outliers (mips64 and mips64-n32): it issues
__NR_newfstatat and convert the result to struct stat64.
It allows to remove all the hidden definitions from the {f,l}xstat{64}
(some are still kept because Hurd requires it).
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>
83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
/* Get file status. Linux version.
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/stat.h>
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#include <kernel_stat.h>
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#include <sysdep.h>
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#if !XSTAT_IS_XSTAT64
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# include <kstat_cp.h>
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int
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__fstatat (int fd, const char *file, struct stat *buf, int flag)
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{
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# if STAT_IS_KERNEL_STAT
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/* New kABIs which uses generic pre 64-bit time Linux ABI, e.g.
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csky, nios2 */
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int r = INLINE_SYSCALL_CALL (fstatat64, fd, file, buf, flag);
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if (r == 0 && (buf->__st_ino_pad != 0
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|| buf->__st_size_pad != 0
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|| buf->__st_blocks_pad != 0))
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return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
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return r;
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# else
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# ifdef __NR_fstatat64
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/* Old KABIs with old non-LFS support, e.g. arm, i386, hppa, m68k, mips32,
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microblaze, s390, sh, powerpc, and sparc. */
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struct stat64 st64;
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int r = INLINE_SYSCALL_CALL (fstatat64, fd, file, &st64, flag);
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if (r == 0)
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{
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if (! in_ino_t_range (st64.st_ino)
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|| ! in_off_t_range (st64.st_size)
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|| ! in_blkcnt_t_range (st64.st_blocks))
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return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
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/* Clear internal pad and reserved fields. */
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memset (buf, 0, sizeof (*buf));
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buf->st_dev = st64.st_dev,
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buf->st_ino = st64.st_ino;
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buf->st_mode = st64.st_mode;
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buf->st_nlink = st64.st_nlink;
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buf->st_uid = st64.st_uid;
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buf->st_gid = st64.st_gid;
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buf->st_rdev = st64.st_rdev;
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buf->st_size = st64.st_size;
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buf->st_blksize = st64.st_blksize;
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buf->st_blocks = st64.st_blocks;
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buf->st_atim.tv_sec = st64.st_atim.tv_sec;
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buf->st_atim.tv_nsec = st64.st_atim.tv_nsec;
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buf->st_mtim.tv_sec = st64.st_mtim.tv_sec;
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buf->st_mtim.tv_nsec = st64.st_mtim.tv_nsec;
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buf->st_ctim.tv_sec = st64.st_ctim.tv_sec;
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buf->st_ctim.tv_nsec = st64.st_ctim.tv_nsec;
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}
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return r;
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# else
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/* 64-bit kabi outlier, e.g. mips64 and mips64-n32. */
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struct kernel_stat kst;
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int r = INLINE_SYSCALL_CALL (newfstatat, fd, file, &kst, flag);
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return r ?: __cp_kstat_stat (&kst, buf);
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# endif /* __nr_fstatat64 */
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# endif /* STAT_IS_KERNEL_STAT */
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}
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weak_alias (__fstatat, fstatat)
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#endif
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