You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
107 lines
2.8 KiB
107 lines
2.8 KiB
/*
|
|
* Copyright (C) 2010 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include "os.h"
|
|
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <cstddef>
|
|
#include <memory>
|
|
|
|
#include <android-base/logging.h>
|
|
|
|
#include "unix_file/fd_file.h"
|
|
|
|
namespace art {
|
|
|
|
File* OS::OpenFileForReading(const char* name) {
|
|
return OpenFileWithFlags(name, O_RDONLY);
|
|
}
|
|
|
|
File* OS::OpenFileReadWrite(const char* name) {
|
|
return OpenFileWithFlags(name, O_RDWR);
|
|
}
|
|
|
|
static File* CreateEmptyFile(const char* name, int extra_flags) {
|
|
// In case the file exists, unlink it so we get a new file. This is necessary as the previous
|
|
// file may be in use and must not be changed.
|
|
unlink(name);
|
|
|
|
return OS::OpenFileWithFlags(name, O_CREAT | extra_flags);
|
|
}
|
|
|
|
File* OS::CreateEmptyFile(const char* name) {
|
|
return art::CreateEmptyFile(name, O_RDWR | O_TRUNC);
|
|
}
|
|
|
|
File* OS::CreateEmptyFileWriteOnly(const char* name) {
|
|
#ifdef _WIN32
|
|
int flags = O_WRONLY | O_TRUNC;
|
|
#else
|
|
int flags = O_WRONLY | O_TRUNC | O_NOFOLLOW | O_CLOEXEC;
|
|
#endif
|
|
return art::CreateEmptyFile(name, flags);
|
|
}
|
|
|
|
File* OS::OpenFileWithFlags(const char* name, int flags, bool auto_flush) {
|
|
CHECK(name != nullptr);
|
|
bool read_only = ((flags & O_ACCMODE) == O_RDONLY);
|
|
bool check_usage = !read_only && auto_flush;
|
|
std::unique_ptr<File> file(
|
|
new File(name, flags, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH, check_usage));
|
|
if (!file->IsOpened()) {
|
|
return nullptr;
|
|
}
|
|
return file.release();
|
|
}
|
|
|
|
bool OS::FileExists(const char* name, bool check_file_type) {
|
|
struct stat st;
|
|
if (stat(name, &st) == 0) {
|
|
if (check_file_type) {
|
|
return S_ISREG(st.st_mode); // TODO: Deal with symlinks?
|
|
} else {
|
|
return true;
|
|
}
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool OS::DirectoryExists(const char* name) {
|
|
struct stat st;
|
|
if (stat(name, &st) == 0) {
|
|
return S_ISDIR(st.st_mode); // TODO: Deal with symlinks?
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
int64_t OS::GetFileSizeBytes(const char* name) {
|
|
struct stat st;
|
|
if (stat(name, &st) == 0) {
|
|
return st.st_size; // TODO: Deal with symlinks? According to the documentation,
|
|
// the st_size for a symlink is "the length of the pathname
|
|
// it contains, without a terminating null byte."
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
} // namespace art
|