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// Copyright (c) 2012 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 <unistd.h>
#include "base/eintr_wrapper.h"
#include "base/file_path.h"
#include "base/logging.h"
#include "base/threading/thread_restrictions.h"
#include "base/utf_string_conversions.h"
#if defined(OS_ANDROID)
#include "base/os_compat_android.h"
#endif
namespace base {
#if defined(OS_BSD) || (defined(OS_MACOSX) && \
MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5)
typedef struct stat stat_wrapper_t;
static int CallFstat(int fd, stat_wrapper_t *sb) {
base::ThreadRestrictions::AssertIOAllowed();
return fstat(fd, sb);
}
#else
typedef struct stat64 stat_wrapper_t;
static int CallFstat(int fd, stat_wrapper_t *sb) {
base::ThreadRestrictions::AssertIOAllowed();
return fstat64(fd, sb);
}
#endif
// TODO(erikkay): does it make sense to support PLATFORM_FILE_EXCLUSIVE_* here?
PlatformFile CreatePlatformFile(const FilePath& name, int flags,
bool* created, PlatformFileError* error_code) {
base::ThreadRestrictions::AssertIOAllowed();
int open_flags = 0;
if (flags & PLATFORM_FILE_CREATE)
open_flags = O_CREAT | O_EXCL;
if (created)
*created = false;
if (flags & PLATFORM_FILE_CREATE_ALWAYS) {
DCHECK(!open_flags);
open_flags = O_CREAT | O_TRUNC;
}
if (flags & PLATFORM_FILE_OPEN_TRUNCATED) {
DCHECK(!open_flags);
DCHECK(flags & PLATFORM_FILE_WRITE);
open_flags = 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) &&
!(flags & PLATFORM_FILE_WRITE_ATTRIBUTES) &&
!(flags & PLATFORM_FILE_OPEN_ALWAYS)) {
NOTREACHED();
}
COMPILE_ASSERT(O_RDONLY == 0, O_RDONLY_must_equal_zero);
int mode = S_IRUSR | S_IWUSR;
#if defined(OS_CHROMEOS)
mode |= S_IRGRP | S_IROTH;
#endif
int descriptor =
HANDLE_EINTR(open(name.value().c_str(), open_flags, mode));
if (flags & PLATFORM_FILE_OPEN_ALWAYS) {
if (descriptor < 0) {
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 = HANDLE_EINTR(
open(name.value().c_str(), open_flags, mode));
if (created && descriptor >= 0)
*created = true;
}
}
if (created && (descriptor >= 0) &&
(flags & (PLATFORM_FILE_CREATE_ALWAYS | PLATFORM_FILE_CREATE)))
*created = true;
if ((descriptor >= 0) && (flags & PLATFORM_FILE_DELETE_ON_CLOSE)) {
unlink(name.value().c_str());
}
if (error_code) {
if (descriptor >= 0)
*error_code = PLATFORM_FILE_OK;
else {
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;
}
bool ClosePlatformFile(PlatformFile file) {
base::ThreadRestrictions::AssertIOAllowed();
return !HANDLE_EINTR(close(file));
}
int ReadPlatformFile(PlatformFile file, int64 offset, char* data, int size) {
base::ThreadRestrictions::AssertIOAllowed();
if (file < 0 || size < 0)
return -1;
int bytes_read = 0;
int rv;
do {
rv = HANDLE_EINTR(pread(file, data + bytes_read,
size - bytes_read, offset + bytes_read));
if (rv <= 0)
break;
bytes_read += rv;
} while (bytes_read < size);
return bytes_read ? bytes_read : rv;
}
int ReadPlatformFileNoBestEffort(PlatformFile file, int64 offset,
char* data, int size) {
base::ThreadRestrictions::AssertIOAllowed();
if (file < 0)
return -1;
return HANDLE_EINTR(pread(file, data, size, offset));
}
int WritePlatformFile(PlatformFile file, int64 offset,
const char* data, int size) {
base::ThreadRestrictions::AssertIOAllowed();
if (file < 0 || size < 0)
return -1;
int bytes_written = 0;
int rv;
do {
rv = HANDLE_EINTR(pwrite(file, data + bytes_written,
size - bytes_written, offset + bytes_written));
if (rv <= 0)
break;
bytes_written += rv;
} while (bytes_written < size);
return bytes_written ? bytes_written : rv;
}
bool TruncatePlatformFile(PlatformFile file, int64 length) {
base::ThreadRestrictions::AssertIOAllowed();
return ((file >= 0) && !HANDLE_EINTR(ftruncate(file, length)));
}
bool FlushPlatformFile(PlatformFile file) {
base::ThreadRestrictions::AssertIOAllowed();
return !HANDLE_EINTR(fsync(file));
}
bool TouchPlatformFile(PlatformFile file, const base::Time& last_access_time,
const base::Time& last_modified_time) {
base::ThreadRestrictions::AssertIOAllowed();
if (file < 0)
return false;
timeval times[2];
times[0] = last_access_time.ToTimeVal();
times[1] = last_modified_time.ToTimeVal();
return !futimes(file, times);
}
bool GetPlatformFileInfo(PlatformFile file, PlatformFileInfo* info) {
if (!info)
return false;
stat_wrapper_t file_info;
if (CallFstat(file, &file_info))
return false;
info->is_directory = S_ISDIR(file_info.st_mode);
info->is_symbolic_link = S_ISLNK(file_info.st_mode);
info->size = file_info.st_size;
info->last_modified = base::Time::FromTimeT(file_info.st_mtime);
info->last_accessed = base::Time::FromTimeT(file_info.st_atime);
info->creation_time = base::Time::FromTimeT(file_info.st_ctime);
return true;
}
} // namespace base
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