1 /* SPDX-License-Identifier: LGPL-2.1+ */
5 This file is part of systemd.
7 Copyright 2010 Lennart Poettering
9 systemd is free software; you can redistribute it and/or modify it
10 under the terms of the GNU Lesser General Public License as published by
11 the Free Software Foundation; either version 2.1 of the License, or
12 (at your option) any later version.
14 systemd is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
19 You should have received a copy of the GNU Lesser General Public License
20 along with systemd; If not, see <http://www.gnu.org/licenses/>.
30 /* Some structures we reference but don't want to pull in headers for */
32 struct signalfd_siginfo;
34 typedef enum LogRealm {
41 # define LOG_REALM LOG_REALM_SYSTEMD
44 typedef enum LogTarget{
46 LOG_TARGET_CONSOLE_PREFIXED,
49 LOG_TARGET_JOURNAL_OR_KMSG,
51 LOG_TARGET_SYSLOG_OR_KMSG,
52 LOG_TARGET_AUTO, /* console if stderr is tty, JOURNAL_OR_KMSG otherwise */
55 _LOG_TARGET_INVALID = -1
58 #define LOG_REALM_PLUS_LEVEL(realm, level) \
59 ((realm) << 10 | (level))
60 #define LOG_REALM_REMOVE_LEVEL(realm_level) \
63 void log_set_target(LogTarget target);
64 void log_set_max_level_realm(LogRealm realm, int level);
65 #define log_set_max_level(level) \
66 log_set_max_level_realm(LOG_REALM, (level))
68 void log_set_facility(int facility);
70 int log_set_target_from_string(const char *e);
71 int log_set_max_level_from_string_realm(LogRealm realm, const char *e);
72 #define log_set_max_level_from_string(e) \
73 log_set_max_level_from_string_realm(LOG_REALM, (e))
75 void log_show_color(bool b);
76 bool log_get_show_color(void) _pure_;
77 void log_show_location(bool b);
78 bool log_get_show_location(void) _pure_;
80 int log_show_color_from_string(const char *e);
81 int log_show_location_from_string(const char *e);
83 LogTarget log_get_target(void) _pure_;
84 int log_get_max_level_realm(LogRealm realm) _pure_;
85 #define log_get_max_level() \
86 log_get_max_level_realm(LOG_REALM)
88 /* Functions below that open and close logs or configure logging based on the
89 * environment should not be called from library code — this is always a job
90 * for the application itself.
95 #if 0 /// UNNEEDED by elogind
96 void log_forget_fds(void);
99 void log_parse_environment_realm(LogRealm realm);
100 #define log_parse_environment() \
101 log_parse_environment_realm(LOG_REALM)
103 int log_dispatch_internal(
109 const char *object_field,
112 const char *extra_field,
115 int log_internal_realm(
121 const char *format, ...) _printf_(6,7);
122 #define log_internal(level, ...) \
123 log_internal_realm(LOG_REALM_PLUS_LEVEL(LOG_REALM, (level)), __VA_ARGS__)
125 int log_internalv_realm(
132 va_list ap) _printf_(6,0);
133 #define log_internalv(level, ...) \
134 log_internalv_realm(LOG_REALM_PLUS_LEVEL(LOG_REALM, (level)), __VA_ARGS__)
136 /* Realm is fixed to LOG_REALM_SYSTEMD for those */
137 int log_object_internal(
143 const char *object_field,
145 const char *extra_field,
147 const char *format, ...) _printf_(10,11);
149 int log_struct_internal(
155 const char *format, ...) _printf_(6,0) _sentinel_;
157 int log_oom_internal(
163 int log_format_iovec(
167 bool newline_separator,
170 va_list ap) _printf_(6, 0);
172 int log_struct_iovec_internal(
178 const struct iovec *input_iovec,
179 size_t n_input_iovec);
181 /* This modifies the buffer passed! */
182 int log_dump_internal(
190 /* Logging for various assertions */
191 noreturn void log_assert_failed_realm(
197 #define log_assert_failed(text, ...) \
198 log_assert_failed_realm(LOG_REALM, (text), __VA_ARGS__)
200 noreturn void log_assert_failed_unreachable_realm(
206 #define log_assert_failed_unreachable(text, ...) \
207 log_assert_failed_unreachable_realm(LOG_REALM, (text), __VA_ARGS__)
209 void log_assert_failed_return_realm(
215 #define log_assert_failed_return(text, ...) \
216 log_assert_failed_return_realm(LOG_REALM, (text), __VA_ARGS__)
218 #define log_dispatch(level, error, buffer) \
219 log_dispatch_internal(level, error, __FILE__, __LINE__, __func__, NULL, NULL, NULL, NULL, buffer)
221 /* Logging with level */
222 #define log_full_errno_realm(realm, level, error, ...) \
224 int _level = (level), _e = (error), _realm = (realm); \
225 (log_get_max_level_realm(_realm) >= LOG_PRI(_level)) \
226 ? log_internal_realm(LOG_REALM_PLUS_LEVEL(_realm, _level), _e, \
227 __FILE__, __LINE__, __func__, __VA_ARGS__) \
231 #define log_full_errno(level, error, ...) \
232 log_full_errno_realm(LOG_REALM, (level), (error), __VA_ARGS__)
234 #define log_full(level, ...) log_full_errno((level), 0, __VA_ARGS__)
236 int log_emergency_level(void);
239 #define log_debug(...) log_full(LOG_DEBUG, __VA_ARGS__)
240 #define log_info(...) log_full(LOG_INFO, __VA_ARGS__)
241 #define log_notice(...) log_full(LOG_NOTICE, __VA_ARGS__)
242 #define log_warning(...) log_full(LOG_WARNING, __VA_ARGS__)
243 #define log_error(...) log_full(LOG_ERR, __VA_ARGS__)
244 #define log_emergency(...) log_full(log_emergency_level(), __VA_ARGS__)
246 /* Logging triggered by an errno-like error */
247 #define log_debug_errno(error, ...) log_full_errno(LOG_DEBUG, error, __VA_ARGS__)
248 #define log_info_errno(error, ...) log_full_errno(LOG_INFO, error, __VA_ARGS__)
249 #define log_notice_errno(error, ...) log_full_errno(LOG_NOTICE, error, __VA_ARGS__)
250 #define log_warning_errno(error, ...) log_full_errno(LOG_WARNING, error, __VA_ARGS__)
251 #define log_error_errno(error, ...) log_full_errno(LOG_ERR, error, __VA_ARGS__)
252 #define log_emergency_errno(error, ...) log_full_errno(log_emergency_level(), error, __VA_ARGS__)
255 # define log_trace(...) log_debug(__VA_ARGS__)
257 # define log_trace(...) do {} while (0)
260 #ifdef ENABLE_DEBUG_ELOGIND
261 # define log_debug_elogind(...) log_debug(__VA_ARGS__);usleep(25*USEC_PER_MSEC)
263 # define log_debug_elogind(...) do {} while (0)
264 #endif // ENABLE_DEBUG_ELOGIND
265 /* Structured logging */
266 #define log_struct_errno(level, error, ...) \
267 log_struct_internal(LOG_REALM_PLUS_LEVEL(LOG_REALM, level), \
268 error, __FILE__, __LINE__, __func__, __VA_ARGS__)
269 #define log_struct(level, ...) log_struct_errno(level, 0, __VA_ARGS__)
271 #define log_struct_iovec_errno(level, error, iovec, n_iovec) \
272 log_struct_iovec_internal(LOG_REALM_PLUS_LEVEL(LOG_REALM, level), \
273 error, __FILE__, __LINE__, __func__, iovec, n_iovec)
274 #define log_struct_iovec(level, iovec, n_iovec) log_struct_iovec_errno(level, 0, iovec, n_iovec)
276 /* This modifies the buffer passed! */
277 #define log_dump(level, buffer) \
278 log_dump_internal(LOG_REALM_PLUS_LEVEL(LOG_REALM, level), \
279 0, __FILE__, __LINE__, __func__, buffer)
281 #define log_oom() log_oom_internal(LOG_REALM, __FILE__, __LINE__, __func__)
283 bool log_on_console(void) _pure_;
285 const char *log_target_to_string(LogTarget target) _const_;
286 LogTarget log_target_from_string(const char *s) _pure_;
288 /* Helper to prepare various field for structured logging */
289 #define LOG_MESSAGE(fmt, ...) "MESSAGE=" fmt, ##__VA_ARGS__
291 #if 0 /// UNNEEDED by elogind
292 void log_received_signal(int level, const struct signalfd_siginfo *si);
294 /* If turned on, any requests for a log target involving "syslog" will be implicitly upgraded to the equivalent journal target */
295 void log_set_upgrade_syslog_to_journal(bool b);
297 /* If turned on, and log_open() is called, we'll not use STDERR_FILENO for logging ever, but rather open /dev/console */
298 void log_set_always_reopen_console(bool b);
301 /* If turned on, we'll open the log stream implicitly if needed on each individual log call. This is normally not
302 * desired as we want to reuse our logging streams. It is useful however */
303 void log_set_open_when_needed(bool b);
305 /* If turned on, then we'll never use IPC-based logging, i.e. never log to syslog or the journal. We'll only log to
306 * stderr, the console or kmsg */
307 void log_set_prohibit_ipc(bool b);
309 int log_syntax_internal(
312 const char *config_file,
313 unsigned config_line,
318 const char *format, ...) _printf_(9, 10);
320 int log_syntax_invalid_utf8_internal(
323 const char *config_file,
324 unsigned config_line,
330 #define log_syntax(unit, level, config_file, config_line, error, ...) \
332 int _level = (level), _e = (error); \
333 (log_get_max_level() >= LOG_PRI(_level)) \
334 ? log_syntax_internal(unit, _level, config_file, config_line, _e, __FILE__, __LINE__, __func__, __VA_ARGS__) \
338 #define log_syntax_invalid_utf8(unit, level, config_file, config_line, rvalue) \
340 int _level = (level); \
341 (log_get_max_level() >= LOG_PRI(_level)) \
342 ? log_syntax_invalid_utf8_internal(unit, _level, config_file, config_line, __FILE__, __LINE__, __func__, rvalue) \
346 #define DEBUG_LOGGING _unlikely_(log_get_max_level() >= LOG_DEBUG)