462 lines
14 KiB
C++
462 lines
14 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/platform_file.h"
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "base/files/file_path.h"
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#include "base/logging.h"
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#include "base/metrics/sparse_histogram.h"
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#include "base/posix/eintr_wrapper.h"
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#include "base/strings/utf_string_conversions.h"
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#include "base/threading/thread_restrictions.h"
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#if defined(OS_ANDROID)
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#include "base/os_compat_android.h"
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#endif
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namespace base {
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// Make sure our Whence mappings match the system headers.
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COMPILE_ASSERT(PLATFORM_FILE_FROM_BEGIN == SEEK_SET &&
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PLATFORM_FILE_FROM_CURRENT == SEEK_CUR &&
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PLATFORM_FILE_FROM_END == SEEK_END, whence_matches_system);
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namespace {
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#if defined(OS_BSD) || defined(OS_MACOSX) || defined(OS_NACL)
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typedef struct stat stat_wrapper_t;
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static int CallFstat(int fd, stat_wrapper_t *sb) {
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base::ThreadRestrictions::AssertIOAllowed();
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return fstat(fd, sb);
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}
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#else
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typedef struct stat64 stat_wrapper_t;
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static int CallFstat(int fd, stat_wrapper_t *sb) {
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base::ThreadRestrictions::AssertIOAllowed();
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return fstat64(fd, sb);
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}
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#endif
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// NaCl doesn't provide the following system calls, so either simulate them or
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// wrap them in order to minimize the number of #ifdef's in this file.
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#if !defined(OS_NACL)
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static int DoPread(PlatformFile file, char* data, int size, int64 offset) {
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return HANDLE_EINTR(pread(file, data, size, offset));
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}
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static int DoPwrite(PlatformFile file, const char* data, int size,
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int64 offset) {
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return HANDLE_EINTR(pwrite(file, data, size, offset));
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}
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static bool IsOpenAppend(PlatformFile file) {
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return (fcntl(file, F_GETFL) & O_APPEND) != 0;
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}
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static int CallFtruncate(PlatformFile file, int64 length) {
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return HANDLE_EINTR(ftruncate(file, length));
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}
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static int CallFsync(PlatformFile file) {
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return HANDLE_EINTR(fsync(file));
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}
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static int CallFutimes(PlatformFile file, const struct timeval times[2]) {
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#ifdef __USE_XOPEN2K8
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// futimens should be available, but futimes might not be
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// http://pubs.opengroup.org/onlinepubs/9699919799/
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timespec ts_times[2];
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ts_times[0].tv_sec = times[0].tv_sec;
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ts_times[0].tv_nsec = times[0].tv_usec * 1000;
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ts_times[1].tv_sec = times[1].tv_sec;
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ts_times[1].tv_nsec = times[1].tv_usec * 1000;
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return futimens(file, ts_times);
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#else
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return futimes(file, times);
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#endif
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}
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#else // defined(OS_NACL)
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// TODO(bbudge) Remove DoPread, DoPwrite when NaCl implements pread, pwrite.
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static int DoPread(PlatformFile file, char* data, int size, int64 offset) {
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lseek(file, static_cast<off_t>(offset), SEEK_SET);
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return HANDLE_EINTR(read(file, data, size));
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}
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static int DoPwrite(PlatformFile file, const char* data, int size,
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int64 offset) {
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lseek(file, static_cast<off_t>(offset), SEEK_SET);
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return HANDLE_EINTR(write(file, data, size));
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}
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static bool IsOpenAppend(PlatformFile file) {
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// NaCl doesn't implement fcntl. Since NaCl's write conforms to the POSIX
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// standard and always appends if the file is opened with O_APPEND, just
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// return false here.
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return false;
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}
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static int CallFtruncate(PlatformFile file, int64 length) {
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NOTIMPLEMENTED(); // NaCl doesn't implement ftruncate.
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return 0;
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}
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static int CallFsync(PlatformFile file) {
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NOTIMPLEMENTED(); // NaCl doesn't implement fsync.
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return 0;
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}
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static int CallFutimes(PlatformFile file, const struct timeval times[2]) {
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NOTIMPLEMENTED(); // NaCl doesn't implement futimes.
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return 0;
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}
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#endif // defined(OS_NACL)
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} // namespace
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// NaCl doesn't implement system calls to open files directly.
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#if !defined(OS_NACL)
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// TODO(erikkay): does it make sense to support PLATFORM_FILE_EXCLUSIVE_* here?
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PlatformFile CreatePlatformFileUnsafe(const FilePath& name,
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int flags,
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bool* created,
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PlatformFileError* error) {
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base::ThreadRestrictions::AssertIOAllowed();
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int open_flags = 0;
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if (flags & PLATFORM_FILE_CREATE)
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open_flags = O_CREAT | O_EXCL;
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if (created)
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*created = false;
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if (flags & PLATFORM_FILE_CREATE_ALWAYS) {
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DCHECK(!open_flags);
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open_flags = O_CREAT | O_TRUNC;
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}
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if (flags & PLATFORM_FILE_OPEN_TRUNCATED) {
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DCHECK(!open_flags);
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DCHECK(flags & PLATFORM_FILE_WRITE);
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open_flags = O_TRUNC;
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}
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if (!open_flags && !(flags & PLATFORM_FILE_OPEN) &&
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!(flags & PLATFORM_FILE_OPEN_ALWAYS)) {
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NOTREACHED();
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errno = EOPNOTSUPP;
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if (error)
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*error = PLATFORM_FILE_ERROR_FAILED;
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return kInvalidPlatformFileValue;
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}
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if (flags & PLATFORM_FILE_WRITE && flags & PLATFORM_FILE_READ) {
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open_flags |= O_RDWR;
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} else if (flags & PLATFORM_FILE_WRITE) {
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open_flags |= O_WRONLY;
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} else if (!(flags & PLATFORM_FILE_READ) &&
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!(flags & PLATFORM_FILE_WRITE_ATTRIBUTES) &&
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!(flags & PLATFORM_FILE_APPEND) &&
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!(flags & PLATFORM_FILE_OPEN_ALWAYS)) {
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NOTREACHED();
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}
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if (flags & PLATFORM_FILE_TERMINAL_DEVICE)
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open_flags |= O_NOCTTY | O_NDELAY;
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if (flags & PLATFORM_FILE_APPEND && flags & PLATFORM_FILE_READ)
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open_flags |= O_APPEND | O_RDWR;
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else if (flags & PLATFORM_FILE_APPEND)
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open_flags |= O_APPEND | O_WRONLY;
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COMPILE_ASSERT(O_RDONLY == 0, O_RDONLY_must_equal_zero);
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int mode = S_IRUSR | S_IWUSR;
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#if defined(OS_CHROMEOS)
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mode |= S_IRGRP | S_IROTH;
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#endif
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int descriptor =
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HANDLE_EINTR(open(name.value().c_str(), open_flags, mode));
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if (flags & PLATFORM_FILE_OPEN_ALWAYS) {
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if (descriptor < 0) {
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open_flags |= O_CREAT;
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if (flags & PLATFORM_FILE_EXCLUSIVE_READ ||
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flags & PLATFORM_FILE_EXCLUSIVE_WRITE) {
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open_flags |= O_EXCL; // together with O_CREAT implies O_NOFOLLOW
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}
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descriptor = HANDLE_EINTR(
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open(name.value().c_str(), open_flags, mode));
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if (created && descriptor >= 0)
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*created = true;
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}
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}
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if (created && (descriptor >= 0) &&
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(flags & (PLATFORM_FILE_CREATE_ALWAYS | PLATFORM_FILE_CREATE)))
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*created = true;
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if ((descriptor >= 0) && (flags & PLATFORM_FILE_DELETE_ON_CLOSE)) {
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unlink(name.value().c_str());
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}
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if (error) {
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if (descriptor >= 0)
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*error = PLATFORM_FILE_OK;
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else
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*error = ErrnoToPlatformFileError(errno);
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}
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return descriptor;
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}
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FILE* FdopenPlatformFile(PlatformFile file, const char* mode) {
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return fdopen(file, mode);
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}
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#endif // !defined(OS_NACL)
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bool ClosePlatformFile(PlatformFile file) {
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base::ThreadRestrictions::AssertIOAllowed();
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return !HANDLE_EINTR(close(file));
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}
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int64 SeekPlatformFile(PlatformFile file,
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PlatformFileWhence whence,
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int64 offset) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file < 0 || offset < 0)
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return -1;
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return lseek(file, static_cast<off_t>(offset), static_cast<int>(whence));
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}
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int ReadPlatformFile(PlatformFile file, int64 offset, char* data, int size) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file < 0 || size < 0)
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return -1;
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int bytes_read = 0;
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int rv;
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do {
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rv = DoPread(file, data + bytes_read,
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size - bytes_read, offset + bytes_read);
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if (rv <= 0)
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break;
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bytes_read += rv;
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} while (bytes_read < size);
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return bytes_read ? bytes_read : rv;
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}
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int ReadPlatformFileAtCurrentPos(PlatformFile file, char* data, int size) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file < 0 || size < 0)
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return -1;
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int bytes_read = 0;
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int rv;
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do {
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rv = HANDLE_EINTR(read(file, data, size));
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if (rv <= 0)
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break;
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bytes_read += rv;
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} while (bytes_read < size);
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return bytes_read ? bytes_read : rv;
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}
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int ReadPlatformFileNoBestEffort(PlatformFile file, int64 offset,
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char* data, int size) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file < 0)
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return -1;
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return DoPread(file, data, size, offset);
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}
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int ReadPlatformFileCurPosNoBestEffort(PlatformFile file,
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char* data, int size) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file < 0 || size < 0)
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return -1;
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return HANDLE_EINTR(read(file, data, size));
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}
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int WritePlatformFile(PlatformFile file, int64 offset,
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const char* data, int size) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (IsOpenAppend(file))
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return WritePlatformFileAtCurrentPos(file, data, size);
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if (file < 0 || size < 0)
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return -1;
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int bytes_written = 0;
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int rv;
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do {
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rv = DoPwrite(file, data + bytes_written,
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size - bytes_written, offset + bytes_written);
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if (rv <= 0)
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break;
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bytes_written += rv;
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} while (bytes_written < size);
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return bytes_written ? bytes_written : rv;
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}
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int WritePlatformFileAtCurrentPos(PlatformFile file,
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const char* data, int size) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file < 0 || size < 0)
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return -1;
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int bytes_written = 0;
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int rv;
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do {
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rv = HANDLE_EINTR(write(file, data, size));
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if (rv <= 0)
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break;
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bytes_written += rv;
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} while (bytes_written < size);
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return bytes_written ? bytes_written : rv;
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}
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int WritePlatformFileCurPosNoBestEffort(PlatformFile file,
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const char* data, int size) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file < 0 || size < 0)
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return -1;
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return HANDLE_EINTR(write(file, data, size));
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}
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bool TruncatePlatformFile(PlatformFile file, int64 length) {
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base::ThreadRestrictions::AssertIOAllowed();
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return ((file >= 0) && !CallFtruncate(file, length));
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}
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bool FlushPlatformFile(PlatformFile file) {
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base::ThreadRestrictions::AssertIOAllowed();
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return !CallFsync(file);
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}
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bool TouchPlatformFile(PlatformFile file, const base::Time& last_access_time,
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const base::Time& last_modified_time) {
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base::ThreadRestrictions::AssertIOAllowed();
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if (file < 0)
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return false;
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timeval times[2];
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times[0] = last_access_time.ToTimeVal();
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times[1] = last_modified_time.ToTimeVal();
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return !CallFutimes(file, times);
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}
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bool GetPlatformFileInfo(PlatformFile file, PlatformFileInfo* info) {
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if (!info)
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return false;
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stat_wrapper_t file_info;
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if (CallFstat(file, &file_info))
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return false;
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info->is_directory = S_ISDIR(file_info.st_mode);
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info->is_symbolic_link = S_ISLNK(file_info.st_mode);
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info->size = file_info.st_size;
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#if defined(OS_LINUX)
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const time_t last_modified_sec = file_info.st_mtim.tv_sec;
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const int64 last_modified_nsec = file_info.st_mtim.tv_nsec;
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const time_t last_accessed_sec = file_info.st_atim.tv_sec;
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const int64 last_accessed_nsec = file_info.st_atim.tv_nsec;
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const time_t creation_time_sec = file_info.st_ctim.tv_sec;
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const int64 creation_time_nsec = file_info.st_ctim.tv_nsec;
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#elif defined(OS_ANDROID)
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const time_t last_modified_sec = file_info.st_mtime;
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const int64 last_modified_nsec = file_info.st_mtime_nsec;
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const time_t last_accessed_sec = file_info.st_atime;
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const int64 last_accessed_nsec = file_info.st_atime_nsec;
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const time_t creation_time_sec = file_info.st_ctime;
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const int64 creation_time_nsec = file_info.st_ctime_nsec;
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#elif defined(OS_MACOSX) || defined(OS_IOS) || defined(OS_BSD)
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const time_t last_modified_sec = file_info.st_mtimespec.tv_sec;
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const int64 last_modified_nsec = file_info.st_mtimespec.tv_nsec;
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const time_t last_accessed_sec = file_info.st_atimespec.tv_sec;
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const int64 last_accessed_nsec = file_info.st_atimespec.tv_nsec;
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const time_t creation_time_sec = file_info.st_ctimespec.tv_sec;
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const int64 creation_time_nsec = file_info.st_ctimespec.tv_nsec;
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#else
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// TODO(gavinp): Investigate a good high resolution option for OS_NACL.
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const time_t last_modified_sec = file_info.st_mtime;
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const int64 last_modified_nsec = 0;
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const time_t last_accessed_sec = file_info.st_atime;
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const int64 last_accessed_nsec = 0;
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const time_t creation_time_sec = file_info.st_ctime;
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const int64 creation_time_nsec = 0;
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#endif
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info->last_modified =
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base::Time::FromTimeT(last_modified_sec) +
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base::TimeDelta::FromMicroseconds(last_modified_nsec /
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base::Time::kNanosecondsPerMicrosecond);
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info->last_accessed =
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base::Time::FromTimeT(last_accessed_sec) +
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base::TimeDelta::FromMicroseconds(last_accessed_nsec /
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base::Time::kNanosecondsPerMicrosecond);
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info->creation_time =
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base::Time::FromTimeT(creation_time_sec) +
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base::TimeDelta::FromMicroseconds(creation_time_nsec /
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base::Time::kNanosecondsPerMicrosecond);
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return true;
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}
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PlatformFileError ErrnoToPlatformFileError(int saved_errno) {
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switch (saved_errno) {
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case EACCES:
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case EISDIR:
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case EROFS:
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case EPERM:
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return PLATFORM_FILE_ERROR_ACCESS_DENIED;
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#if !defined(OS_NACL) // ETXTBSY not defined by NaCl.
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case ETXTBSY:
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return PLATFORM_FILE_ERROR_IN_USE;
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#endif
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case EEXIST:
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return PLATFORM_FILE_ERROR_EXISTS;
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case ENOENT:
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return PLATFORM_FILE_ERROR_NOT_FOUND;
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case EMFILE:
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return PLATFORM_FILE_ERROR_TOO_MANY_OPENED;
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case ENOMEM:
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return PLATFORM_FILE_ERROR_NO_MEMORY;
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case ENOSPC:
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return PLATFORM_FILE_ERROR_NO_SPACE;
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case ENOTDIR:
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return PLATFORM_FILE_ERROR_NOT_A_DIRECTORY;
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default:
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#if !defined(OS_NACL) // NaCl build has no metrics code.
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UMA_HISTOGRAM_SPARSE_SLOWLY("PlatformFile.UnknownErrors.Posix",
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saved_errno);
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#endif
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return PLATFORM_FILE_ERROR_FAILED;
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}
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}
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} // namespace base
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