mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 08:40:07 +00:00
4751bbe2ad
This patch fixes the p{readv,writev}{64} consolidation implementation
from commits 4e77815 and af5fdf5. Different from pread/pwrite
implementation, preadv/pwritev implementation does not require
__ALIGNMENT_ARG because kernel syscall prototypes define
the high and low part of the off_t, if it is the case, directly
(different from pread/pwrite where the architecture ABI for passing
64-bit values must be in consideration for passsing the arguments).
It also adds some basic tests for preadv/pwritev.
Tested on x86_64, i686, and armhf.
* misc/Makefile (tests): Add tst-preadvwritev and tst-preadvwritev64.
* misc/tst-preadvwritev.c: New file.
* misc/tst-preadvwritev64.c: Likewise.
* sysdeps/unix/sysv/linux/preadv.c (preadv): Remove SYSCALL_LL{64}
usage.
* sysdeps/unix/sysv/linux/preadv64.c (preadv64): Likewise.
* sysdeps/unix/sysv/linux/pwritev.c (pwritev): Likewise.
* sysdeps/unix/sysv/linux/pwritev64.c (pwritev64): Likewise.
* sysdeps/unix/sysv/linux/sysdep.h (LO_HI_LONG): New macro.
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/* Copyright (C) 2016 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sys/uio.h>
|
|
#include <sysdep-cancel.h>
|
|
|
|
#ifdef __ASSUME_PREADV
|
|
|
|
# ifndef __NR_preadv64
|
|
# define __NR_preadv64 __NR_preadv
|
|
# endif
|
|
|
|
ssize_t
|
|
preadv64 (int fd, const struct iovec *vector, int count, off64_t offset)
|
|
{
|
|
return SYSCALL_CANCEL (preadv64, fd, vector, count, LO_HI_LONG (offset));
|
|
}
|
|
#else
|
|
static ssize_t __atomic_preadv64_replacement (int, const struct iovec *,
|
|
int, off64_t) internal_function;
|
|
ssize_t
|
|
preadv64 (int fd, const struct iovec *vector, int count, off64_t offset)
|
|
{
|
|
#ifdef __NR_preadv64
|
|
ssize_t result = SYSCALL_CANCEL (preadv64, fd, vector, count,
|
|
LO_HI_LONG (offset));
|
|
if (result >= 0 || errno != ENOSYS)
|
|
return result;
|
|
#endif
|
|
return __atomic_preadv64_replacement (fd, vector, count, offset);
|
|
}
|
|
# define PREADV static internal_function __atomic_preadv64_replacement
|
|
# define PREAD __pread64
|
|
# define OFF_T off64_t
|
|
# include <sysdeps/posix/preadv.c>
|
|
#endif
|
|
|
|
#if __WORDSIZE == 64 && !defined (__ASSUME_OFF_DIFF_OFF64)
|
|
strong_alias (preadv64, preadv)
|
|
#endif
|