blob: f45e9f60300612394c08642a011295b0bfee0df9 [file] [log] [blame]
Elliott Hughes2faa5f12012-01-30 14:42:07 -08001/*
2 * Copyright (C) 2010 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 */
Brian Carlstromdb4d5402011-08-09 12:18:28 -070016
17#include "os.h"
18
Brian Carlstromdb4d5402011-08-09 12:18:28 -070019#include <sys/types.h>
20#include <sys/stat.h>
21#include <fcntl.h>
Ian Rogers700a4022014-05-19 16:49:03 -070022#include <cstddef>
23#include <memory>
Brian Carlstromdb4d5402011-08-09 12:18:28 -070024
Brian Carlstromb45ccbf2013-03-13 15:14:24 -070025#include "base/logging.h"
Elliott Hughes76160052012-12-12 16:31:20 -080026#include "base/unix_file/fd_file.h"
Brian Carlstromdb4d5402011-08-09 12:18:28 -070027
28namespace art {
29
Brian Carlstrom7571e8b2013-08-12 17:04:14 -070030File* OS::OpenFileForReading(const char* name) {
31 return OpenFileWithFlags(name, O_RDONLY);
32}
33
34File* OS::OpenFileReadWrite(const char* name) {
35 return OpenFileWithFlags(name, O_RDWR);
36}
37
Calin Juravlef83e7332015-11-04 16:16:47 +000038static File* CreateEmptyFile(const char* name, int extra_flags) {
Andreas Gampeb73f1f52015-06-30 10:52:46 -070039 // In case the file exists, unlink it so we get a new file. This is necessary as the previous
40 // file may be in use and must not be changed.
41 unlink(name);
42
Calin Juravlef83e7332015-11-04 16:16:47 +000043 return OS::OpenFileWithFlags(name, O_CREAT | extra_flags);
44}
45
46File* OS::CreateEmptyFile(const char* name) {
47 return art::CreateEmptyFile(name, O_RDWR | O_TRUNC);
48}
49
50File* OS::CreateEmptyFileWriteOnly(const char* name) {
51 return art::CreateEmptyFile(name, O_WRONLY | O_TRUNC | O_NOFOLLOW | O_CLOEXEC);
Brian Carlstrom7571e8b2013-08-12 17:04:14 -070052}
53
54File* OS::OpenFileWithFlags(const char* name, int flags) {
Mathieu Chartier2cebb242015-04-21 16:50:40 -070055 CHECK(name != nullptr);
Ian Rogers700a4022014-05-19 16:49:03 -070056 std::unique_ptr<File> file(new File);
Elliott Hughes76160052012-12-12 16:31:20 -080057 if (!file->Open(name, flags, 0666)) {
Mathieu Chartier2cebb242015-04-21 16:50:40 -070058 return nullptr;
Brian Carlstromdb4d5402011-08-09 12:18:28 -070059 }
Elliott Hughes76160052012-12-12 16:31:20 -080060 return file.release();
Brian Carlstromdb4d5402011-08-09 12:18:28 -070061}
62
63bool OS::FileExists(const char* name) {
64 struct stat st;
65 if (stat(name, &st) == 0) {
Brian Carlstrom4a289ed2011-08-16 17:17:49 -070066 return S_ISREG(st.st_mode); // TODO: Deal with symlinks?
Brian Carlstromdb4d5402011-08-09 12:18:28 -070067 } else {
68 return false;
69 }
70}
71
Brian Carlstrom16192862011-09-12 17:50:06 -070072bool OS::DirectoryExists(const char* name) {
73 struct stat st;
74 if (stat(name, &st) == 0) {
75 return S_ISDIR(st.st_mode); // TODO: Deal with symlinks?
76 } else {
77 return false;
78 }
79}
80
Brian Carlstromdb4d5402011-08-09 12:18:28 -070081} // namespace art