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1 | /* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
18 | ||
19 | #include <sys/types.h> | |
20 | #include <endian.h> | |
21 | #include <errno.h> | |
22 | #include <unistd.h> | |
23 | ||
24 | #include <sysdep.h> | |
25 | #include <sys/syscall.h> | |
26 | ||
27 | #include "kernel-features.h" | |
28 | ||
29 | #ifdef __NR_truncate64 | |
30 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
31 | /* The variable is shared between all wrappers around *truncate64 calls. */ | |
32 | int __have_no_truncate64; | |
33 | #endif | |
34 | ||
35 | /* The order of hight, low depends on endianness. */ | |
2995dde0 AJ |
36 | extern int __syscall_truncate64 (const char *path, int dummy, |
37 | int high_length, int low_length); | |
e82a0295 AJ |
38 | |
39 | ||
40 | /* Truncate the file FD refers to to LENGTH bytes. */ | |
41 | int | |
42 | truncate64 (const char *path, off64_t length) | |
43 | { | |
44 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
45 | if (! __have_no_truncate64) | |
46 | #endif | |
47 | { | |
48 | unsigned int low = length & 0xffffffff; | |
49 | unsigned int high = length >> 32; | |
50 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
51 | int saved_errno = errno; | |
52 | #endif | |
ca1cde9e GM |
53 | int result = INLINE_SYSCALL (truncate64, 3, path, 0, |
54 | __LONG_LONG_PAIR (high, low)); | |
e82a0295 AJ |
55 | #ifndef __ASSUME_TRUNCATE64_SYSCALL |
56 | if (result != -1 || errno != ENOSYS) | |
57 | #endif | |
58 | return result; | |
59 | ||
60 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
61 | __set_errno (saved_errno); | |
62 | __have_no_truncate64 = 1; | |
63 | #endif | |
64 | } | |
65 | ||
66 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
67 | if ((off_t) length != length) | |
68 | { | |
69 | __set_errno (EINVAL); | |
70 | return -1; | |
71 | } | |
72 | return truncate (path, (off_t) length); | |
73 | #endif | |
74 | } | |
75 | ||
76 | #else | |
77 | /* Use the generic implementation. */ | |
78 | # include <sysdeps/generic/truncate64.c> | |
79 | #endif |