The Tor Browser: ipc/chromium/src/base/platform_file

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 // Copyright (c) 2006-2008 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/platform_file.h"

     7 #include <sys/stat.h>

     8 #include <fcntl.h>

     9 #include <errno.h>

    10 #ifdef ANDROID

    11 #include <linux/stat.h>

    12 #endif

    14 #include "base/logging.h"

    15 #include "base/string_util.h"

    17 namespace base {

    19 // TODO(erikkay): does it make sense to support PLATFORM_FILE_EXCLUSIVE_* here?

    20 PlatformFile CreatePlatformFile(const std::wstring& name,

    21                                 int flags,

    22                                 bool* created) {

    23   int open_flags = 0;

    24   if (flags & PLATFORM_FILE_CREATE)

    25     open_flags = O_CREAT | O_EXCL;

    27   if (flags & PLATFORM_FILE_CREATE_ALWAYS) {

    28     DCHECK(!open_flags);

    29     open_flags = O_CREAT | O_TRUNC;

    30   }

    32   if (!open_flags && !(flags & PLATFORM_FILE_OPEN) &&

    33       !(flags & PLATFORM_FILE_OPEN_ALWAYS)) {

    34     NOTREACHED();

    35     errno = ENOTSUP;

    36     return kInvalidPlatformFileValue;

    37   }

    39   if (flags & PLATFORM_FILE_WRITE && flags & PLATFORM_FILE_READ) {

    40     open_flags |= O_RDWR;

    41   } else if (flags & PLATFORM_FILE_WRITE) {

    42     open_flags |= O_WRONLY;

    43   } else if (!(flags & PLATFORM_FILE_READ)) {

    44     NOTREACHED();

    45   }

    47   DCHECK(O_RDONLY == 0);

    49   int descriptor = open(WideToUTF8(name).c_str(), open_flags,

    50                         S_IRUSR | S_IWUSR);

    52   if (flags & PLATFORM_FILE_OPEN_ALWAYS) {

    53     if (descriptor > 0) {

    54       if (created)

    55         *created = false;

    56     } else {

    57       open_flags |= O_CREAT;

    58       descriptor = open(WideToUTF8(name).c_str(), open_flags,

    59                         S_IRUSR | S_IWUSR);

    60       if (created && descriptor > 0)

    61         *created = true;

    62     }

    63   }

    65   return descriptor;

    66 }

    68 }  // namespace base

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