Android Native代码中的status_t定义

定义在Android/system/core/include/utils/Errors.h中，小提示，Android代码中遇到的symbol，既不是Linux中提供的定义，使用source insight又找不到的情况下，可以去Android/system/core/include/目录找找，可能会有意想不到的收获哦。

定义如下：

1/*2 * Copyright (C) 2007 The Android Open Source Project3 *4 * Licensed under the Apache License, Version 2.0 (the "License");5 * you may not use this file except in compliance with the License.6 * You may obtain a copy of the License at7 *8 *      http://www.apache.org/licenses/LICENSE-2.09 *10 * Unless required by applicable law or agreed to in writing, software11 * distributed under the License is distributed on an "AS IS" BASIS,12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.13 * See the License for the specific language governing permissions and14 * limitations under the License.15 */1617#ifndef ANDROID_ERRORS_H18#define ANDROID_ERRORS_H1920#include 21#include 2223namespace android {2425// use this type to return error codes26#ifdef _WIN3227typedef int         status_t;28#else29typedef int32_t     status_t;30#endif3132/* the MS C runtime lacks a few error codes */3334/*35 * Error codes.36 * All error codes are negative values.37 */3839// Win32 #defines NO_ERROR as well.  It has the same value, so there's no40// real conflict, though it's a bit awkward.41#ifdef _WIN3242# undef NO_ERROR43#endif4445enum {46    OK                = 0,    // Everything's swell.47    NO_ERROR          = 0,    // No errors.4849    UNKNOWN_ERROR       = (-2147483647-1), // INT32_MIN value5051    NO_MEMORY           = -ENOMEM,52    INVALID_OPERATION   = -ENOSYS,53    BAD_VALUE           = -EINVAL,54    BAD_TYPE            = (UNKNOWN_ERROR + 1),55    NAME_NOT_FOUND      = -ENOENT,56    PERMISSION_DENIED   = -EPERM,57    NO_INIT             = -ENODEV,58    ALREADY_EXISTS      = -EEXIST,59    DEAD_OBJECT         = -EPIPE,60    FAILED_TRANSACTION  = (UNKNOWN_ERROR + 2),61#if !defined(_WIN32)62    BAD_INDEX           = -EOVERFLOW,63    NOT_ENOUGH_DATA     = -ENODATA,64    WOULD_BLOCK         = -EWOULDBLOCK,65    TIMED_OUT           = -ETIMEDOUT,66    UNKNOWN_TRANSACTION = -EBADMSG,67#else68    BAD_INDEX           = -E2BIG,69    NOT_ENOUGH_DATA     = (UNKNOWN_ERROR + 3),70    WOULD_BLOCK         = (UNKNOWN_ERROR + 4),71    TIMED_OUT           = (UNKNOWN_ERROR + 5),72    UNKNOWN_TRANSACTION = (UNKNOWN_ERROR + 6),73#endif74    FDS_NOT_ALLOWED     = (UNKNOWN_ERROR + 7),75    UNEXPECTED_NULL     = (UNKNOWN_ERROR + 8),76};7778// Restore define; enumeration is in "android" namespace, so the value defined79// there won't work for Win32 code in a different namespace.80#ifdef _WIN3281# define NO_ERROR 0L82#endif8384}; // namespace android8586// ---------------------------------------------------------------------------8788#endif // ANDROID_ERRORS_H89

定义在Android/system/core/include/utils/Errors.h中，小提示，Android代码中遇到的symbol，既不是Linux中提供的定义，使用source insight又找不到的情况下，可以去Android/system/core/include/目录找找，可能会有意想不到的收获哦。

所以，我们看到的status_t不过是int类型而已，只是取值有些枚举值已经定义好，当然也可以自己扩展。

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