1 /*
2  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
3  *
4  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
5  */
6 /* truncate64 syscall.  Copes with 64 bit and 32 bit machines
7  * and on 32 bit machines this sends things into the kernel as
8  * two 32-bit arguments (high and low 32 bits of length) that
9  * are ordered based on endianess.  It turns out endian.h has
10  * just the macro we need to order things, OFF64_HI_LO.
11  */
12 
13 #include <_lfs_64.h>
14 #include <sys/syscall.h>
15 #include <unistd.h>
16 
17 #ifdef __NR_truncate64
18 # include <bits/wordsize.h>
19 
20 # if __WORDSIZE == 64
21 _syscall2(int, truncate64, const char *, path, __off64_t, length)
22 # elif __WORDSIZE == 32
23 #  include <endian.h>
24 #  include <stdint.h>
25 int truncate64(const char * path, __off64_t length)
26 {
27 #  if defined(__UCLIBC_SYSCALL_ALIGN_64BIT__)
28 	return INLINE_SYSCALL(truncate64, 4, path, 0, OFF64_HI_LO(length));
29 #  else
30 	return INLINE_SYSCALL(truncate64, 3, path, OFF64_HI_LO(length));
31 #  endif
32 }
33 # else
34 #  error Your machine is not 64 bit nor 32 bit, I am dazed and confused.
35 # endif
36 
37 #else
38 # include <errno.h>
39 int truncate64(const char * path, __off64_t length)
40 {
41 	__off_t x = (__off_t) length;
42 
43 	if (x == length) {
44 		return truncate(path, x);
45 	}
46 
47 	__set_errno((x < 0) ? EINVAL : EFBIG);
48 
49 	return -1;
50 }
51 
52 #endif /* __NR_truncate64 */
53 libc_hidden_def(truncate64)
54