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| 1 /* | |
| 2 * Copyright (C) 2009 The Android Open Source Project | |
| 3 * | |
| 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 at | |
| 7 * | |
| 8 * http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 * | |
| 10 * Unless required by applicable law or agreed to in writing, software | |
| 11 * 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 and | |
| 14 * limitations under the License. | |
| 15 */ | |
| 16 | |
| 17 #ifndef _ANDROID_LOG_H | |
| 18 #define _ANDROID_LOG_H | |
| 19 | |
| 20 /****************************************************************** | |
| 21 * | |
| 22 * IMPORTANT NOTICE: | |
| 23 * | |
| 24 * This file is part of Android's set of stable system headers | |
| 25 * exposed by the Android NDK (Native Development Kit) since | |
| 26 * platform release 1.5 | |
| 27 * | |
| 28 * Third-party source AND binary code relies on the definitions | |
| 29 * here to be FROZEN ON ALL UPCOMING PLATFORM RELEASES. | |
| 30 * | |
| 31 * - DO NOT MODIFY ENUMS (EXCEPT IF YOU ADD NEW 32-BIT VALUES) | |
| 32 * - DO NOT MODIFY CONSTANTS OR FUNCTIONAL MACROS | |
| 33 * - DO NOT CHANGE THE SIGNATURE OF FUNCTIONS IN ANY WAY | |
| 34 * - DO NOT CHANGE THE LAYOUT OR SIZE OF STRUCTURES | |
| 35 */ | |
| 36 | |
| 37 /* | |
| 38 * Support routines to send messages to the Android in-kernel log buffer, | |
| 39 * which can later be accessed through the 'logcat' utility. | |
| 40 * | |
| 41 * Each log message must have | |
| 42 * - a priority | |
| 43 * - a log tag | |
| 44 * - some text | |
| 45 * | |
| 46 * The tag normally corresponds to the component that emits the log message, | |
| 47 * and should be reasonably small. | |
| 48 * | |
| 49 * Log message text may be truncated to less than an implementation-specific | |
| 50 * limit (e.g. 1023 characters max). | |
| 51 * | |
| 52 * Note that a newline character ("\n") will be appended automatically to your | |
| 53 * log message, if not already there. It is not possible to send several message
s | |
| 54 * and have them appear on a single line in logcat. | |
| 55 * | |
| 56 * PLEASE USE LOGS WITH MODERATION: | |
| 57 * | |
| 58 * - Sending log messages eats CPU and slow down your application and the | |
| 59 * system. | |
| 60 * | |
| 61 * - The circular log buffer is pretty small (<64KB), sending many messages | |
| 62 * might push off other important log messages from the rest of the system. | |
| 63 * | |
| 64 * - In release builds, only send log messages to account for exceptional | |
| 65 * conditions. | |
| 66 * | |
| 67 * NOTE: These functions MUST be implemented by /system/lib/liblog.so | |
| 68 */ | |
| 69 | |
| 70 #include <stdarg.h> | |
| 71 | |
| 72 #ifdef __cplusplus | |
| 73 extern "C" { | |
| 74 #endif | |
| 75 | |
| 76 /* | |
| 77 * Android log priority values, in ascending priority order. | |
| 78 */ | |
| 79 typedef enum android_LogPriority { | |
| 80 ANDROID_LOG_UNKNOWN = 0, | |
| 81 ANDROID_LOG_DEFAULT, /* only for SetMinPriority() */ | |
| 82 ANDROID_LOG_VERBOSE, | |
| 83 ANDROID_LOG_DEBUG, | |
| 84 ANDROID_LOG_INFO, | |
| 85 ANDROID_LOG_WARN, | |
| 86 ANDROID_LOG_ERROR, | |
| 87 ANDROID_LOG_FATAL, | |
| 88 ANDROID_LOG_SILENT, /* only for SetMinPriority(); must be last */ | |
| 89 } android_LogPriority; | |
| 90 | |
| 91 /* | |
| 92 * Send a simple string to the log. | |
| 93 */ | |
| 94 int __android_log_write(int prio, const char *tag, const char *text); | |
| 95 | |
| 96 /* | |
| 97 * Send a formatted string to the log, used like printf(fmt,...) | |
| 98 */ | |
| 99 int __android_log_print(int prio, const char *tag, const char *fmt, ...) | |
| 100 #if defined(__GNUC__) | |
| 101 __attribute__ ((format(printf, 3, 4))) | |
| 102 #endif | |
| 103 ; | |
| 104 | |
| 105 /* | |
| 106 * A variant of __android_log_print() that takes a va_list to list | |
| 107 * additional parameters. | |
| 108 */ | |
| 109 int __android_log_vprint(int prio, const char *tag, | |
| 110 const char *fmt, va_list ap); | |
| 111 | |
| 112 /* | |
| 113 * Log an assertion failure and SIGTRAP the process to have a chance | |
| 114 * to inspect it, if a debugger is attached. This uses the FATAL priority. | |
| 115 */ | |
| 116 void __android_log_assert(const char *cond, const char *tag, | |
| 117 const char *fmt, ...) | |
| 118 #if defined(__GNUC__) | |
| 119 __attribute__ ((noreturn)) | |
| 120 __attribute__ ((format(printf, 3, 4))) | |
| 121 #endif | |
| 122 ; | |
| 123 | |
| 124 #ifdef __cplusplus | |
| 125 } | |
| 126 #endif | |
| 127 | |
| 128 #endif /* _ANDROID_LOG_H */ | |
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