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| 1 // Copyright 2014 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. | |
| 4 | |
| 5 #ifndef MOJO_PUBLIC_C_ENVIRONMENT_LOGGER_H_ | |
| 6 #define MOJO_PUBLIC_C_ENVIRONMENT_LOGGER_H_ | |
| 7 | |
| 8 #include <stdint.h> | |
| 9 | |
| 10 // |MojoLogLevel|: Used to specify the type of log message. Values are ordered | |
| 11 // by severity (i.e., higher numerical values are more severe). | |
| 12 | |
| 13 typedef int32_t MojoLogLevel; | |
| 14 | |
| 15 #ifdef __cplusplus | |
| 16 const MojoLogLevel MOJO_LOG_LEVEL_VERBOSE = -1; | |
| 17 const MojoLogLevel MOJO_LOG_LEVEL_INFO = 0; | |
| 18 const MojoLogLevel MOJO_LOG_LEVEL_WARNING = 1; | |
| 19 const MojoLogLevel MOJO_LOG_LEVEL_ERROR = 2; | |
| 20 const MojoLogLevel MOJO_LOG_LEVEL_FATAL = 3; | |
| 21 #else | |
| 22 #define MOJO_LOG_LEVEL_VERBOSE ((MojoLogLevel) - 1) | |
| 23 #define MOJO_LOG_LEVEL_INFO ((MojoLogLevel)0) | |
| 24 #define MOJO_LOG_LEVEL_WARNING ((MojoLogLevel)1) | |
| 25 #define MOJO_LOG_LEVEL_ERROR ((MojoLogLevel)2) | |
| 26 #define MOJO_LOG_LEVEL_FATAL ((MojoLogLevel)3) | |
| 27 #endif | |
| 28 | |
| 29 // Structure with basic logging functions (on top of which more friendly logging | |
| 30 // macros may be built). The functions are thread-safe, except for | |
| 31 // |SetMinimumLogLevel()| (see below). | |
| 32 struct MojoLogger { | |
| 33 // Logs |message| at level |log_level| if |log_level| is at least the current | |
| 34 // minimum log level. If |log_level| is |MOJO_LOG_LEVEL_FATAL| (or greater), | |
| 35 // aborts the application/process. | |
| 36 void (*LogMessage)(MojoLogLevel log_level, const char* message); | |
| 37 | |
| 38 // Gets the minimum log level (see above), which will always be at most | |
| 39 // |MOJO_LOG_LEVEL_FATAL|. (Though |LogMessage()| will automatically avoid | |
| 40 // logging messages below the minimum log level, this may be used to avoid | |
| 41 // extra work.) | |
| 42 MojoLogLevel (*GetMinimumLogLevel)(void); | |
| 43 | |
| 44 // Sets the minimum log level (see above) to the lesser of |minimum_log_level| | |
| 45 // and |MOJO_LOG_LEVEL_FATAL|. | |
| 46 // | |
| 47 // Warning: This function may not be thread-safe, and should not be called | |
| 48 // concurrently with other |MojoLogger| functions. (In some environments -- | |
| 49 // such as Chromium -- that share a logger across applications, this may mean | |
| 50 // that it is almost never safe to call this.) | |
| 51 void (*SetMinimumLogLevel)(MojoLogLevel minimum_log_level); | |
| 52 }; | |
| 53 | |
| 54 #endif // MOJO_PUBLIC_C_ENVIRONMENT_LOGGER_H_ | |
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