1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "base/files/file.h"
12 #include "base/files/file_path.h"
13 #include "base/logging.h"
14 #include "base/metrics/sparse_histogram.h"
15 // TODO(rvargas): remove this (needed for kInvalidPlatformFileValue).
16 #include "base/platform_file.h"
17 #include "base/posix/eintr_wrapper.h"
18 #include "base/strings/utf_string_conversions.h"
19 #include "base/threading/thread_restrictions.h"
21 #if defined(OS_ANDROID)
22 #include "base/os_compat_android.h"
27 // Make sure our Whence mappings match the system headers.
28 COMPILE_ASSERT(File::FROM_BEGIN == SEEK_SET &&
29 File::FROM_CURRENT == SEEK_CUR &&
30 File::FROM_END == SEEK_END, whence_matches_system);
34 #if defined(OS_BSD) || defined(OS_MACOSX) || defined(OS_NACL)
35 static int CallFstat(int fd, stat_wrapper_t *sb) {
36 base::ThreadRestrictions::AssertIOAllowed();
40 static int CallFstat(int fd, stat_wrapper_t *sb) {
41 base::ThreadRestrictions::AssertIOAllowed();
42 return fstat64(fd, sb);
46 // NaCl doesn't provide the following system calls, so either simulate them or
47 // wrap them in order to minimize the number of #ifdef's in this file.
49 static bool IsOpenAppend(PlatformFile file) {
50 return (fcntl(file, F_GETFL) & O_APPEND) != 0;
53 static int CallFtruncate(PlatformFile file, int64 length) {
54 return HANDLE_EINTR(ftruncate(file, length));
57 static int CallFsync(PlatformFile file) {
58 return HANDLE_EINTR(fsync(file));
61 static int CallFutimes(PlatformFile file, const struct timeval times[2]) {
63 // futimens should be available, but futimes might not be
64 // http://pubs.opengroup.org/onlinepubs/9699919799/
67 ts_times[0].tv_sec = times[0].tv_sec;
68 ts_times[0].tv_nsec = times[0].tv_usec * 1000;
69 ts_times[1].tv_sec = times[1].tv_sec;
70 ts_times[1].tv_nsec = times[1].tv_usec * 1000;
72 return futimens(file, ts_times);
74 return futimes(file, times);
78 static File::Error CallFctnlFlock(PlatformFile file, bool do_lock) {
80 lock.l_type = F_WRLCK;
81 lock.l_whence = SEEK_SET;
83 lock.l_len = 0; // Lock entire file.
84 if (HANDLE_EINTR(fcntl(file, do_lock ? F_SETLK : F_UNLCK, &lock)) == -1)
85 return File::OSErrorToFileError(errno);
88 #else // defined(OS_NACL)
90 static bool IsOpenAppend(PlatformFile file) {
91 // NaCl doesn't implement fcntl. Since NaCl's write conforms to the POSIX
92 // standard and always appends if the file is opened with O_APPEND, just
97 static int CallFtruncate(PlatformFile file, int64 length) {
98 NOTIMPLEMENTED(); // NaCl doesn't implement ftruncate.
102 static int CallFsync(PlatformFile file) {
103 NOTIMPLEMENTED(); // NaCl doesn't implement fsync.
107 static int CallFutimes(PlatformFile file, const struct timeval times[2]) {
108 NOTIMPLEMENTED(); // NaCl doesn't implement futimes.
112 static File::Error CallFctnlFlock(PlatformFile file, bool do_lock) {
113 NOTIMPLEMENTED(); // NaCl doesn't implement flock struct.
114 return File::FILE_ERROR_INVALID_OPERATION;
116 #endif // defined(OS_NACL)
120 void File::Info::FromStat(const stat_wrapper_t& stat_info) {
121 is_directory = S_ISDIR(stat_info.st_mode);
122 is_symbolic_link = S_ISLNK(stat_info.st_mode);
123 size = stat_info.st_size;
125 #if defined(OS_LINUX)
126 time_t last_modified_sec = stat_info.st_mtim.tv_sec;
127 int64 last_modified_nsec = stat_info.st_mtim.tv_nsec;
128 time_t last_accessed_sec = stat_info.st_atim.tv_sec;
129 int64 last_accessed_nsec = stat_info.st_atim.tv_nsec;
130 time_t creation_time_sec = stat_info.st_ctim.tv_sec;
131 int64 creation_time_nsec = stat_info.st_ctim.tv_nsec;
132 #elif defined(OS_ANDROID)
133 time_t last_modified_sec = stat_info.st_mtime;
134 int64 last_modified_nsec = stat_info.st_mtime_nsec;
135 time_t last_accessed_sec = stat_info.st_atime;
136 int64 last_accessed_nsec = stat_info.st_atime_nsec;
137 time_t creation_time_sec = stat_info.st_ctime;
138 int64 creation_time_nsec = stat_info.st_ctime_nsec;
139 #elif defined(OS_MACOSX) || defined(OS_IOS) || defined(OS_BSD)
140 time_t last_modified_sec = stat_info.st_mtimespec.tv_sec;
141 int64 last_modified_nsec = stat_info.st_mtimespec.tv_nsec;
142 time_t last_accessed_sec = stat_info.st_atimespec.tv_sec;
143 int64 last_accessed_nsec = stat_info.st_atimespec.tv_nsec;
144 time_t creation_time_sec = stat_info.st_ctimespec.tv_sec;
145 int64 creation_time_nsec = stat_info.st_ctimespec.tv_nsec;
147 time_t last_modified_sec = stat_info.st_mtime;
148 int64 last_modified_nsec = 0;
149 time_t last_accessed_sec = stat_info.st_atime;
150 int64 last_accessed_nsec = 0;
151 time_t creation_time_sec = stat_info.st_ctime;
152 int64 creation_time_nsec = 0;
156 Time::FromTimeT(last_modified_sec) +
157 TimeDelta::FromMicroseconds(last_modified_nsec /
158 Time::kNanosecondsPerMicrosecond);
161 Time::FromTimeT(last_accessed_sec) +
162 TimeDelta::FromMicroseconds(last_accessed_nsec /
163 Time::kNanosecondsPerMicrosecond);
166 Time::FromTimeT(creation_time_sec) +
167 TimeDelta::FromMicroseconds(creation_time_nsec /
168 Time::kNanosecondsPerMicrosecond);
171 // NaCl doesn't implement system calls to open files directly.
172 #if !defined(OS_NACL)
173 // TODO(erikkay): does it make sense to support FLAG_EXCLUSIVE_* here?
174 void File::InitializeUnsafe(const FilePath& name, uint32 flags) {
175 base::ThreadRestrictions::AssertIOAllowed();
179 if (flags & FLAG_CREATE)
180 open_flags = O_CREAT | O_EXCL;
184 if (flags & FLAG_CREATE_ALWAYS) {
186 open_flags = O_CREAT | O_TRUNC;
189 if (flags & FLAG_OPEN_TRUNCATED) {
191 DCHECK(flags & FLAG_WRITE);
192 open_flags = O_TRUNC;
195 if (!open_flags && !(flags & FLAG_OPEN) && !(flags & FLAG_OPEN_ALWAYS)) {
198 error_details_ = FILE_ERROR_FAILED;
202 if (flags & FLAG_WRITE && flags & FLAG_READ) {
203 open_flags |= O_RDWR;
204 } else if (flags & FLAG_WRITE) {
205 open_flags |= O_WRONLY;
206 } else if (!(flags & FLAG_READ) &&
207 !(flags & FLAG_WRITE_ATTRIBUTES) &&
208 !(flags & FLAG_APPEND) &&
209 !(flags & FLAG_OPEN_ALWAYS)) {
213 if (flags & FLAG_TERMINAL_DEVICE)
214 open_flags |= O_NOCTTY | O_NDELAY;
216 if (flags & FLAG_APPEND && flags & FLAG_READ)
217 open_flags |= O_APPEND | O_RDWR;
218 else if (flags & FLAG_APPEND)
219 open_flags |= O_APPEND | O_WRONLY;
221 COMPILE_ASSERT(O_RDONLY == 0, O_RDONLY_must_equal_zero);
223 int mode = S_IRUSR | S_IWUSR;
224 #if defined(OS_CHROMEOS)
225 mode |= S_IRGRP | S_IROTH;
228 int descriptor = HANDLE_EINTR(open(name.value().c_str(), open_flags, mode));
230 if (flags & FLAG_OPEN_ALWAYS) {
231 if (descriptor < 0) {
232 open_flags |= O_CREAT;
233 if (flags & FLAG_EXCLUSIVE_READ || flags & FLAG_EXCLUSIVE_WRITE)
234 open_flags |= O_EXCL; // together with O_CREAT implies O_NOFOLLOW
236 descriptor = HANDLE_EINTR(open(name.value().c_str(), open_flags, mode));
242 if (descriptor < 0) {
243 error_details_ = File::OSErrorToFileError(errno);
247 if (flags & (FLAG_CREATE_ALWAYS | FLAG_CREATE))
250 if (flags & FLAG_DELETE_ON_CLOSE)
251 unlink(name.value().c_str());
253 async_ = ((flags & FLAG_ASYNC) == FLAG_ASYNC);
254 error_details_ = FILE_OK;
255 file_.reset(descriptor);
257 #endif // !defined(OS_NACL)
259 bool File::IsValid() const {
260 return file_.is_valid();
263 PlatformFile File::GetPlatformFile() const {
267 PlatformFile File::TakePlatformFile() {
268 return file_.release();
275 base::ThreadRestrictions::AssertIOAllowed();
279 int64 File::Seek(Whence whence, int64 offset) {
280 base::ThreadRestrictions::AssertIOAllowed();
285 return lseek(file_.get(), static_cast<off_t>(offset),
286 static_cast<int>(whence));
289 int File::Read(int64 offset, char* data, int size) {
290 base::ThreadRestrictions::AssertIOAllowed();
298 rv = HANDLE_EINTR(pread(file_.get(), data + bytes_read,
299 size - bytes_read, offset + bytes_read));
304 } while (bytes_read < size);
306 return bytes_read ? bytes_read : rv;
309 int File::ReadAtCurrentPos(char* data, int size) {
310 base::ThreadRestrictions::AssertIOAllowed();
318 rv = HANDLE_EINTR(read(file_.get(), data + bytes_read, size - bytes_read));
323 } while (bytes_read < size);
325 return bytes_read ? bytes_read : rv;
328 int File::ReadNoBestEffort(int64 offset, char* data, int size) {
329 base::ThreadRestrictions::AssertIOAllowed();
332 return HANDLE_EINTR(pread(file_.get(), data, size, offset));
335 int File::ReadAtCurrentPosNoBestEffort(char* data, int size) {
336 base::ThreadRestrictions::AssertIOAllowed();
341 return HANDLE_EINTR(read(file_.get(), data, size));
344 int File::Write(int64 offset, const char* data, int size) {
345 base::ThreadRestrictions::AssertIOAllowed();
347 if (IsOpenAppend(file_.get()))
348 return WriteAtCurrentPos(data, size);
354 int bytes_written = 0;
357 rv = HANDLE_EINTR(pwrite(file_.get(), data + bytes_written,
358 size - bytes_written, offset + bytes_written));
363 } while (bytes_written < size);
365 return bytes_written ? bytes_written : rv;
368 int File::WriteAtCurrentPos(const char* data, int size) {
369 base::ThreadRestrictions::AssertIOAllowed();
374 int bytes_written = 0;
377 rv = HANDLE_EINTR(write(file_.get(), data + bytes_written,
378 size - bytes_written));
383 } while (bytes_written < size);
385 return bytes_written ? bytes_written : rv;
388 int File::WriteAtCurrentPosNoBestEffort(const char* data, int size) {
389 base::ThreadRestrictions::AssertIOAllowed();
394 return HANDLE_EINTR(write(file_.get(), data, size));
397 int64 File::GetLength() {
400 stat_wrapper_t file_info;
401 if (CallFstat(file_.get(), &file_info))
404 return file_info.st_size;
407 bool File::SetLength(int64 length) {
408 base::ThreadRestrictions::AssertIOAllowed();
410 return !CallFtruncate(file_.get(), length);
414 base::ThreadRestrictions::AssertIOAllowed();
416 return !CallFsync(file_.get());
419 bool File::SetTimes(Time last_access_time, Time last_modified_time) {
420 base::ThreadRestrictions::AssertIOAllowed();
424 times[0] = last_access_time.ToTimeVal();
425 times[1] = last_modified_time.ToTimeVal();
427 return !CallFutimes(file_.get(), times);
430 bool File::GetInfo(Info* info) {
433 stat_wrapper_t file_info;
434 if (CallFstat(file_.get(), &file_info))
437 info->FromStat(file_info);
441 File::Error File::Lock() {
442 return CallFctnlFlock(file_.get(), true);
445 File::Error File::Unlock() {
446 return CallFctnlFlock(file_.get(), false);
450 File::Error File::OSErrorToFileError(int saved_errno) {
451 switch (saved_errno) {
456 return FILE_ERROR_ACCESS_DENIED;
457 #if !defined(OS_NACL) // ETXTBSY not defined by NaCl.
459 return FILE_ERROR_IN_USE;
462 return FILE_ERROR_EXISTS;
464 return FILE_ERROR_NOT_FOUND;
466 return FILE_ERROR_TOO_MANY_OPENED;
468 return FILE_ERROR_NO_MEMORY;
470 return FILE_ERROR_NO_SPACE;
472 return FILE_ERROR_NOT_A_DIRECTORY;
474 #if !defined(OS_NACL) // NaCl build has no metrics code.
475 UMA_HISTOGRAM_SPARSE_SLOWLY("PlatformFile.UnknownErrors.Posix",
478 return FILE_ERROR_FAILED;
482 void File::SetPlatformFile(PlatformFile file) {
483 DCHECK(!file_.is_valid());