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/*

 * truncate64 syscall.  Copes with 64 bit and 32 bit machines

 * and on 32 bit machines this sends things into the kernel as

 * two 32-bit arguments (high and low 32 bits of length) that

 * are ordered based on endianess.  It turns out endian.h has

 * just the macro we need to order things, __LONG_LONG_PAIR.

 *

 *  Copyright (C) 2002  Erik Andersen <andersen@codepoet.org>

 *

 * This file is subject to the terms and conditions of the GNU

 * Lesser General Public License.  See the file COPYING.LIB in

 * the main directory of this archive for more details.

 */

#include <features.h>

#include <unistd.h>

#include <errno.h>

#include <endian.h>

#include <stdint.h>

#include <sys/syscall.h>

#if defined __NR_truncate64

#if __WORDSIZE == 64 || (defined(__powerpc__) && defined (__UCLIBC_HAS_LFS__))

/* For a 64 bit machine, life is simple... */

_syscall2(int, truncate64, const char *, path, __off64_t, length);

#elif __WORDSIZE == 32

#if defined __UCLIBC_HAS_LFS__

#ifndef INLINE_SYSCALL

#define INLINE_SYSCALL(name, nr, args...) __syscall_truncate64 (args)

#define __NR___syscall_truncate64 __NR_truncate64

static inline _syscall3(int, __syscall_truncate64, const char *, path, int, high_length, int, low_length);

#endif

/* The exported truncate64 function.  */

int truncate64 (const char * path, __off64_t length)

{

    uint32_t low = length & 0xffffffff;

    uint32_t high = length >> 32;

    return INLINE_SYSCALL(truncate64, 3, path, __LONG_LONG_PAIR (high, low));

}

#endif /* __UCLIBC_HAS_LFS__ */

#else /* __WORDSIZE */

#error Your machine is not 64 bit or 32 bit, I am dazed and confused.

#endif /* __WORDSIZE */

#endif