third_party/hwcplus/include/android/log.h

   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 messages
  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 */