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-rw-r--r--base/platform_file_posix.cc200
1 files changed, 200 insertions, 0 deletions
diff --git a/base/platform_file_posix.cc b/base/platform_file_posix.cc
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+++ b/base/platform_file_posix.cc
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+// Copyright (c) 2011 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/utf_string_conversions.h"
+
+#if defined(OS_ANDROID)
+#include "base/os_compat_android.h"
+#endif
+
+namespace base {
+
+#if defined(OS_OPENBSD) || defined(OS_FREEBSD) || \
+ (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) {
+ return fstat(fd, sb);
+}
+#else
+typedef struct stat64 stat_wrapper_t;
+static int CallFstat(int fd, stat_wrapper_t *sb) {
+ 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) {
+ 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 descriptor =
+ HANDLE_EINTR(open(name.value().c_str(), open_flags, S_IRUSR | S_IWUSR));
+
+ 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, S_IRUSR | S_IWUSR));
+ 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) {
+ return !HANDLE_EINTR(close(file));
+}
+
+int ReadPlatformFile(PlatformFile file, int64 offset, char* data, int size) {
+ if (file < 0)
+ return -1;
+
+ return HANDLE_EINTR(pread(file, data, size, offset));
+}
+
+int WritePlatformFile(PlatformFile file, int64 offset,
+ const char* data, int size) {
+ if (file < 0)
+ return -1;
+
+ return HANDLE_EINTR(pwrite(file, data, size, offset));
+}
+
+bool TruncatePlatformFile(PlatformFile file, int64 length) {
+ return ((file >= 0) && !HANDLE_EINTR(ftruncate(file, length)));
+}
+
+bool FlushPlatformFile(PlatformFile file) {
+ return !HANDLE_EINTR(fsync(file));
+}
+
+bool TouchPlatformFile(PlatformFile file, const base::Time& last_access_time,
+ const base::Time& last_modified_time) {
+ 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