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/*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
/* 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.
*/
#include <_lfs_64.h>
#include <sys/syscall.h>
#include <unistd.h>
#ifdef __NR_truncate64
# include <bits/wordsize.h>
# if __WORDSIZE == 64
_syscall2(int, truncate64, const char *, path, __off64_t, length)
# elif __WORDSIZE == 32
# include <endian.h>
# include <stdint.h>
int truncate64(const char * path, __off64_t length)
{
uint32_t low = length & 0xffffffff;
uint32_t high = length >> 32;
# if defined(__UCLIBC_TRUNCATE64_HAS_4_ARGS__)
return INLINE_SYSCALL(truncate64, 4, path, 0,
__LONG_LONG_PAIR(high, low));
# else
return INLINE_SYSCALL(truncate64, 3, path,
__LONG_LONG_PAIR(high, low));
# endif
}
# else
# error Your machine is not 64 bit nor 32 bit, I am dazed and confused.
# endif
#else
# include <errno.h>
int truncate64(const char * path, __off64_t length)
{
__off_t x = (__off_t) length;
if (x == length) {
return truncate(path, x);
}
__set_errno((x < 0) ? EINVAL : EFBIG);
return -1;
}
#endif
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