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/* vi: set sw=4 ts=4: */
/*
* posix_fadvise64() for uClibc
* http://www.opengroup.org/onlinepubs/009695399/functions/posix_fadvise.html
*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
#include <features.h>
#include <unistd.h>
#include <errno.h>
#include <endian.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <fcntl.h>
#ifdef __UCLIBC_HAS_LFS__
#ifdef __NR_fadvise64_64
/* 64 bit implementation is cake ... or more like pie ... */
#if __WORDSIZE == 64
#define __NR_posix_fadvise64 __NR_fadvise64_64
#ifdef INTERNAL_SYSCALL
int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
{
if (len != (off_t) len)
return EOVERFLOW;
INTERNAL_SYSCALL_DECL (err);
int ret = INTERNAL_SYSCALL (posix_fadvise64, err, 6, fd,
__LONG_LONG_PAIR ((long) (offset >> 32),
(long) offset),
(off_t) len, advise);
if (!INTERNAL_SYSCALL_ERROR_P (ret, err))
return 0;
return INTERNAL_SYSCALL_ERRNO (ret, err);
}
#else
_syscall4(int, posix_fadvise64, int, fd, __off64_t, offset,
__off64_t, len, int, advice);
#endif
/* 32 bit implementation is kind of a pita */
#elif __WORDSIZE == 32
#ifdef _syscall6 /* workaround until everyone has _syscall6() */
#define __NR___syscall_fadvise64_64 __NR_fadvise64_64
static inline _syscall6(int, __syscall_fadvise64_64, int, fd,
unsigned long, high_offset, unsigned long, low_offset,
unsigned long, high_len, unsigned long, low_len,
int, advice);
int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
{
return (__syscall_fadvise64_64(fd,
__LONG_LONG_PAIR(offset >> 32, offset & 0xffffffff),
__LONG_LONG_PAIR(len >> 32, len & 0xffffffff),
advice));
}
#else
#warning _syscall6 has not been defined for your machine :(
#endif /* _syscall6 */
#else
#error your machine is neither 32 bit or 64 bit ... it must be magical
#endif
#elif !defined __NR_fadvise64
/* This is declared as a strong alias in posix_fadvise.c if __NR_fadvise64
* is defined.
*/
int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
{
__set_errno(ENOSYS);
return -1;
}
#endif /* __NR_fadvise64_64 */
#endif /* __UCLIBC_HAS_LFS__ */
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