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a334319f | 1 | /* Copyright (C) 1997-2000, 2003, 2004 Free Software Foundation, Inc. |
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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 | |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
d587d83b UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
d587d83b | 13 | |
41bdb6e2 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
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18 | |
19 | #include <sys/types.h> | |
1869e7d1 | 20 | #include <endian.h> |
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21 | #include <errno.h> |
22 | #include <unistd.h> | |
23 | ||
24 | #include <sysdep.h> | |
25 | #include <sys/syscall.h> | |
4bbb61e4 | 26 | #include <bp-checks.h> |
d587d83b | 27 | |
a334319f | 28 | #include "kernel-features.h" |
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29 | |
30 | #ifdef __NR_truncate64 | |
29332175 UD |
31 | #ifndef __ASSUME_TRUNCATE64_SYSCALL |
32 | /* The variable is shared between all wrappers around *truncate64 calls. */ | |
313fed01 | 33 | int __have_no_truncate64; |
29332175 | 34 | #endif |
d587d83b | 35 | |
d587d83b UD |
36 | /* Truncate the file FD refers to to LENGTH bytes. */ |
37 | int | |
1869e7d1 | 38 | truncate64 (const char *path, off64_t length) |
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39 | { |
40 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
313fed01 | 41 | if (! __have_no_truncate64) |
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42 | #endif |
43 | { | |
af1680f1 UD |
44 | unsigned int low = length & 0xffffffff; |
45 | unsigned int high = length >> 32; | |
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46 | #ifndef __ASSUME_TRUNCATE64_SYSCALL |
47 | int saved_errno = errno; | |
48 | #endif | |
4bbb61e4 | 49 | int result = INLINE_SYSCALL (truncate64, 3, CHECK_STRING (path), |
ca1cde9e | 50 | __LONG_LONG_PAIR (high, low)); |
d587d83b UD |
51 | #ifndef __ASSUME_TRUNCATE64_SYSCALL |
52 | if (result != -1 || errno != ENOSYS) | |
53 | #endif | |
54 | return result; | |
55 | ||
56 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
63a34b0f | 57 | __set_errno (saved_errno); |
313fed01 | 58 | __have_no_truncate64 = 1; |
d587d83b UD |
59 | #endif |
60 | } | |
61 | ||
62 | #ifndef __ASSUME_TRUNCATE64_SYSCALL | |
63 | if ((off_t) length != length) | |
64 | { | |
65 | __set_errno (EINVAL); | |
66 | return -1; | |
67 | } | |
f5164429 | 68 | return __truncate (path, (off_t) length); |
d587d83b UD |
69 | #endif |
70 | } | |
71 | ||
72 | #else | |
73 | /* Use the generic implementation. */ | |
a334319f | 74 | # include <sysdeps/generic/truncate64.c> |
d587d83b | 75 | #endif |