1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <sys/statfs.h>
18
19 // Paper over the fact that 32-bit kernels use fstatfs64/statfs64 with
20 // an extra argument, but 64-bit kernels don't have the "64" bit suffix or
21 // the extra size_t argument.
22 #if defined(__LP64__)
23 extern "C" int __fstatfs(int, struct statfs*);
24 extern "C" int __statfs(const char*, struct statfs*);
25 # define __fstatfs64(fd,size,buf) __fstatfs(fd,buf)
26 # define __statfs64(path,size,buf) __statfs(path,buf)
27 #else
28 extern "C" int __fstatfs64(int, size_t, struct statfs*);
29 extern "C" int __statfs64(const char*, size_t, struct statfs*);
30 #endif
31
32 // The kernel sets a private ST_VALID flag to signal to the C library
33 // whether the f_flags field is valid. This flag should not be exposed to
34 // users of the C library.
35 #define ST_VALID 0x0020
36
fstatfs(int fd,struct statfs * result)37 int fstatfs(int fd, struct statfs* result) {
38 int rc = __fstatfs64(fd, sizeof(*result), result);
39 if (rc != 0) {
40 return rc;
41 }
42 result->f_flags &= ~ST_VALID;
43 return 0;
44 }
45 __strong_alias(fstatfs64, fstatfs);
46
statfs(const char * path,struct statfs * result)47 int statfs(const char* path, struct statfs* result) {
48 int rc = __statfs64(path, sizeof(*result), result);
49 if (rc != 0) {
50 return rc;
51 }
52 result->f_flags &= ~ST_VALID;
53 return 0;
54 }
55 __strong_alias(statfs64, statfs);
56