1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*
* ftruncate64 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_ftruncate64
# include <bits/wordsize.h>
# if __WORDSIZE == 64
/* For a 64 bit machine, life is simple... */
_syscall2(int, ftruncate64, int, fd, __off64_t, length)
# elif __WORDSIZE == 32
# include <endian.h>
# include <stdint.h>
/* The exported ftruncate64 function. */
int ftruncate64 (int fd, __off64_t length)
{
uint32_t low = length & 0xffffffff;
uint32_t high = length >> 32;
# if defined(__UCLIBC_SYSCALL_ALIGN_64BIT__)
return INLINE_SYSCALL(ftruncate64,
4, fd, 0, __LONG_LONG_PAIR (high, low));
# else
return INLINE_SYSCALL(ftruncate64, 3, fd,
__LONG_LONG_PAIR (high, low));
# endif
}
# else /* __WORDSIZE */
# error Your machine is not 64 bit or 32 bit, I am dazed and confused.
# endif /* __WORDSIZE */
#else /* __NR_ftruncate64 */
# include <errno.h>
int ftruncate64 (int fd, __off64_t length)
{
__off_t x = (__off_t) length;
if (x == length) {
return ftruncate(fd, x);
}
__set_errno((x < 0) ? EINVAL : EFBIG);
return -1;
}
#endif /* __NR_ftruncate64 */
libc_hidden_def(ftruncate64)
|
