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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/platform_file.h"
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#include "base/file_path.h"
#include "base/logging.h"
#include "base/utf_string_conversions.h"
namespace base {
// TODO(erikkay): does it make sense to support PLATFORM_FILE_EXCLUSIVE_* here?
PlatformFile CreatePlatformFile(const FilePath& name, int flags,
bool* created, PlatformFileError* error_code) {
int open_flags = 0;
if (flags & PLATFORM_FILE_CREATE)
open_flags = O_CREAT | O_EXCL;
if (flags & PLATFORM_FILE_CREATE_ALWAYS) {
DCHECK(!open_flags);
open_flags = O_CREAT | O_TRUNC;
}
if (!open_flags && !(flags & PLATFORM_FILE_OPEN) &&
!(flags & PLATFORM_FILE_OPEN_ALWAYS)) {
NOTREACHED();
errno = EOPNOTSUPP;
if (error_code)
*error_code = PLATFORM_FILE_ERROR_FAILED;
return kInvalidPlatformFileValue;
}
if (flags & PLATFORM_FILE_WRITE && flags & PLATFORM_FILE_READ) {
open_flags |= O_RDWR;
} else if (flags & PLATFORM_FILE_WRITE) {
open_flags |= O_WRONLY;
} else if (!(flags & PLATFORM_FILE_READ)) {
NOTREACHED();
}
if (flags & PLATFORM_FILE_TRUNCATE) {
DCHECK(flags & PLATFORM_FILE_WRITE);
open_flags |= O_TRUNC;
}
DCHECK(O_RDONLY == 0);
int descriptor = open(name.value().c_str(), open_flags, S_IRUSR | S_IWUSR);
if (flags & PLATFORM_FILE_OPEN_ALWAYS) {
if (descriptor > 0) {
if (created)
*created = false;
} else {
open_flags |= O_CREAT;
if (flags & PLATFORM_FILE_EXCLUSIVE_READ ||
flags & PLATFORM_FILE_EXCLUSIVE_WRITE) {
open_flags |= O_EXCL; // together with O_CREAT implies O_NOFOLLOW
}
descriptor = open(name.value().c_str(), open_flags, S_IRUSR | S_IWUSR);
if (created && descriptor > 0)
*created = true;
}
}
if ((descriptor < 0) && (flags & PLATFORM_FILE_DELETE_ON_CLOSE)) {
unlink(name.value().c_str());
}
if ((descriptor < 0) && error_code) {
switch (errno) {
case EACCES:
case EISDIR:
case EROFS:
case EPERM:
*error_code = PLATFORM_FILE_ERROR_ACCESS_DENIED;
break;
case ETXTBSY:
*error_code = PLATFORM_FILE_ERROR_IN_USE;
break;
case EEXIST:
*error_code = PLATFORM_FILE_ERROR_EXISTS;
break;
case ENOENT:
*error_code = PLATFORM_FILE_ERROR_NOT_FOUND;
break;
case EMFILE:
*error_code = PLATFORM_FILE_ERROR_TOO_MANY_OPENED;
break;
case ENOMEM:
*error_code = PLATFORM_FILE_ERROR_NO_MEMORY;
break;
case ENOSPC:
*error_code = PLATFORM_FILE_ERROR_NO_SPACE;
break;
case ENOTDIR:
*error_code = PLATFORM_FILE_ERROR_NOT_A_DIRECTORY;
break;
default:
*error_code = PLATFORM_FILE_ERROR_FAILED;
}
}
return descriptor;
}
PlatformFile CreatePlatformFile(const std::wstring& name, int flags,
bool* created) {
return CreatePlatformFile(FilePath::FromWStringHack(name), flags,
created, NULL);
}
bool ClosePlatformFile(PlatformFile file) {
return close(file);
}
} // namespace base
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