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1 | #ifndef BABELTRACE_LOGGING_H |
2 | #define BABELTRACE_LOGGING_H | |
3 | ||
4 | /* | |
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5 | * Copyright (c) 2017 Philippe Proulx <pproulx@efficios.com> |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
20 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
23 | * SOFTWARE. | |
24 | */ | |
25 | ||
26 | #include <stdint.h> | |
27 | #include <stdbool.h> | |
28 | #include <stddef.h> | |
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29 | |
30 | #ifdef __cplusplus | |
31 | extern "C" { | |
32 | #endif | |
33 | ||
34 | /** | |
35 | @defgroup logging Logging | |
36 | @ingroup apiref | |
37 | @brief Logging. | |
38 | ||
39 | @code | |
40 | #include <babeltrace/logging.h> | |
41 | @endcode | |
42 | ||
43 | The functions in this module control the Babeltrace library's logging | |
44 | behaviour. | |
45 | ||
46 | You can set the current global log level of the library with | |
47 | bt_logging_set_global_level(). Note that, if the level you set is below | |
48 | the minimal logging level (configured at build time, which you can get | |
49 | with bt_logging_get_minimal_level()), the logging statement between the | |
50 | current global log level and the minimal log level are not executed. | |
51 | ||
52 | @file | |
53 | @brief Logging functions. | |
54 | @sa logging | |
55 | ||
56 | @addtogroup logging | |
57 | @{ | |
58 | */ | |
59 | ||
60 | /** | |
61 | @brief Log levels. | |
62 | */ | |
4cdfc5e8 | 63 | typedef enum bt_logging_level { |
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64 | /// Additional, low-level debugging context information. |
65 | BT_LOGGING_LEVEL_VERBOSE = 1, | |
66 | ||
67 | /** | |
68 | Debugging information, only useful when searching for the | |
69 | cause of a bug. | |
70 | */ | |
71 | BT_LOGGING_LEVEL_DEBUG = 2, | |
72 | ||
73 | /** | |
74 | Non-debugging information and failure to load optional | |
75 | subsystems. | |
76 | */ | |
77 | BT_LOGGING_LEVEL_INFO = 3, | |
78 | ||
79 | /** | |
80 | Errors caused by a bad usage of the library, that is, a | |
81 | non-observance of the documented function preconditions. | |
82 | ||
83 | The library's and object's states remain consistent when a | |
84 | warning is issued. | |
85 | */ | |
86 | BT_LOGGING_LEVEL_WARN = 4, | |
87 | ||
88 | /** | |
89 | An important error from which the library cannot recover, but | |
90 | the executed stack of functions can still return cleanly. | |
91 | */ | |
92 | BT_LOGGING_LEVEL_ERROR = 5, | |
93 | ||
94 | /** | |
95 | The library cannot continue to work in this condition: it must | |
96 | terminate immediately, without even returning to the user's | |
97 | execution. | |
98 | */ | |
99 | BT_LOGGING_LEVEL_FATAL = 6, | |
100 | ||
101 | /// Logging is disabled. | |
102 | BT_LOGGING_LEVEL_NONE = 0xff, | |
4cdfc5e8 | 103 | } bt_logging_level; |
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104 | |
105 | /** | |
106 | @brief Returns the minimal log level of the Babeltrace library. | |
107 | ||
108 | The minimal log level is defined at the library's build time. Any | |
109 | logging statement with a level below the minimal log level is not | |
110 | compiled. This means that it is useless, although possible, to set the | |
111 | global log level with bt_logging_set_global_level() below this level. | |
112 | ||
113 | @returns Minimal, build time log level. | |
114 | ||
115 | @sa bt_logging_get_global_level(): Returns the current global log level. | |
116 | */ | |
4cdfc5e8 | 117 | extern bt_logging_level bt_logging_get_minimal_level(void); |
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118 | |
119 | /** | |
120 | @brief Returns the current global log level of the Babeltrace library. | |
121 | ||
122 | @returns Current global log level. | |
123 | ||
124 | @sa bt_logging_set_global_level(): Sets the current global log level. | |
125 | @sa bt_logging_get_minimal_level(): Returns the minimal log level. | |
126 | */ | |
4cdfc5e8 | 127 | extern bt_logging_level bt_logging_get_global_level(void); |
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128 | |
129 | /** | |
130 | @brief Sets the current global log level of the Babeltrace library | |
131 | to \p log_level. | |
132 | ||
133 | If \p log_level is below what bt_logging_get_minimal_level() returns, | |
134 | the logging statements with a level between \p log_level and the minimal | |
135 | log level cannot be executed. | |
136 | ||
137 | @param[in] log_level Library's new global log level. | |
138 | ||
139 | @sa bt_logging_get_global_level(): Returns the global log level. | |
140 | */ | |
4cdfc5e8 | 141 | extern void bt_logging_set_global_level(bt_logging_level log_level); |
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142 | |
143 | /** @} */ | |
144 | ||
145 | #ifdef __cplusplus | |
146 | } | |
147 | #endif | |
148 | ||
149 | #endif /* BABELTRACE_LOGGING_H */ |