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/* vi: set sw=4 ts=4: */
/*
* posix_fadvise() 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 <sys/syscall.h>
#ifdef __NR_arm_fadvise64_64
/* We handle the 64bit alignment issue which is why the arm guys renamed their
* syscall in the first place. So rename it back.
*/
# define __NR_fadvise64_64 __NR_arm_fadvise64_64
#endif
#if defined(__NR_fadvise64) || defined(__NR_fadvise64_64)
# include <fcntl.h>
# include <endian.h>
# include <bits/wordsize.h>
# if defined(__NR_fadvise64_64) && defined(__UCLIBC_HAS_LFS__)
#include <_lfs_64.h>
int posix_fadvise64(int fd, off64_t offset, off64_t len, int advice);
int posix_fadvise(int fd, off_t offset, off_t len, int advice)
{
return posix_fadvise64(fd, offset, len, advice);
}
#else
int posix_fadvise(int fd, off_t offset, off_t len, int advice)
{
int ret;
INTERNAL_SYSCALL_DECL(err);
# ifdef __NR_fadvise64_64
# if __WORDSIZE == 64
ret = INTERNAL_SYSCALL(fadvise64_64, err, 4, fd, offset, len, advice);
# else
# if defined (__arm__) || \
(defined(__UCLIBC_SYSCALL_ALIGN_64BIT__) && (defined(__powerpc__) || defined(__xtensa__)))
/* arch with 64-bit data in even reg alignment #1: [powerpc/xtensa]
* custom syscall handler (rearranges @advice to avoid register hole punch) */
ret = INTERNAL_SYSCALL(fadvise64_64, err, 6, fd, advice,
OFF_HI_LO (offset), OFF_HI_LO (len));
# elif defined(__UCLIBC_SYSCALL_ALIGN_64BIT__)
/* arch with 64-bit data in even reg alignment #2: [arcv2/others-in-future]
* stock syscall handler in kernel (reg hole punched) */
ret = INTERNAL_SYSCALL(fadvise64_64, err, 7, fd, 0,
OFF_HI_LO (offset), OFF_HI_LO (len), advice);
# else
ret = INTERNAL_SYSCALL(fadvise64_64, err, 6, fd,
OFF_HI_LO (offset), OFF_HI_LO (len), advice);
# endif
# endif
# else /* __NR_fadvise64 */
# if __WORDSIZE == 64
ret = INTERNAL_SYSCALL(fadvise64, err, 4, fd, offset, len, advice);
# else
# if defined(__UCLIBC_SYSCALL_ALIGN_64BIT__)
ret = INTERNAL_SYSCALL(fadvise64, err, 6, fd, /*unused*/0,
# else
ret = INTERNAL_SYSCALL(fadvise64, err, 5, fd,
# endif
OFF_HI_LO (offset), len, advice);
# endif
# endif
if (INTERNAL_SYSCALL_ERROR_P (ret, err))
return INTERNAL_SYSCALL_ERRNO (ret, err);
return 0;
}
# if defined __UCLIBC_HAS_LFS__ && (!defined __NR_fadvise64_64 || __WORDSIZE == 64)
strong_alias(posix_fadvise,posix_fadvise64)
# endif
#endif
#endif
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