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glibc/sysdeps/unix/sysv/linux/preadv.c
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/* Copyright (C) 2009-2016 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 <errno.h> | |
#include <stddef.h> | |
#include <sys/param.h> | |
#include <stdint.h> | |
#if __WORDSIZE == 64 | |
/* Hide the preadv64 declaration. */ | |
# define preadv64 __redirect_preadv64 | |
#endif | |
#include <sys/uio.h> | |
#include <sysdep-cancel.h> | |
#include <sys/syscall.h> | |
#include <kernel-features.h> | |
#ifndef PREADV | |
# define PREADV preadv | |
# define PREADV_REPLACEMENT __atomic_preadv_replacement | |
# define PREAD __pread | |
# define OFF_T off_t | |
#endif | |
#define LO_HI_LONG(val) \ | |
(off_t) val, \ | |
(off_t) ((((uint64_t) (val)) >> (sizeof (long) * 4)) >> (sizeof (long) * 4)) | |
#ifndef __ASSUME_PREADV | |
static ssize_t PREADV_REPLACEMENT (int, const struct iovec *, | |
int, OFF_T) internal_function; | |
#endif | |
ssize_t | |
PREADV (int fd, const struct iovec *vector, int count, OFF_T offset) | |
{ | |
#ifdef __NR_preadv | |
ssize_t result; | |
result = SYSCALL_CANCEL (preadv, fd, vector, count, LO_HI_LONG (offset)); | |
# ifdef __ASSUME_PREADV | |
return result; | |
# endif | |
#endif | |
#ifndef __ASSUME_PREADV | |
# ifdef __NR_preadv | |
if (result >= 0 || errno != ENOSYS) | |
return result; | |
# endif | |
return PREADV_REPLACEMENT (fd, vector, count, offset); | |
#endif | |
} | |
#if __WORDSIZE == 64 | |
# undef preadv64 | |
strong_alias (preadv, preadv64) | |
#endif | |
#ifndef __ASSUME_PREADV | |
# undef PREADV | |
# define PREADV static internal_function PREADV_REPLACEMENT | |
# include <sysdeps/posix/preadv.c> | |
#endif |