1 /* SPDX-License-Identifier: LGPL-2.1+ */
11 /* Some structures we reference but don't want to pull in headers for */
13 struct signalfd_siginfo
;
15 typedef enum LogRealm
{
22 # define LOG_REALM LOG_REALM_SYSTEMD
25 typedef enum LogTarget
{
27 LOG_TARGET_CONSOLE_PREFIXED
,
30 LOG_TARGET_JOURNAL_OR_KMSG
,
32 LOG_TARGET_SYSLOG_OR_KMSG
,
33 LOG_TARGET_AUTO
, /* console if stderr is tty, JOURNAL_OR_KMSG otherwise */
36 _LOG_TARGET_INVALID
= -1
39 /* Note to readers: << and >> have lower precedence than & and | */
40 #define LOG_REALM_PLUS_LEVEL(realm, level) ((realm) << 10 | (level))
41 #define LOG_REALM_REMOVE_LEVEL(realm_level) ((realm_level) >> 10)
42 #define SYNTHETIC_ERRNO(num) (1 << 30 | (num))
43 #define IS_SYNTHETIC_ERRNO(val) ((val) >> 30 & 1)
44 #define ERRNO_VALUE(val) (abs(val) & 255)
46 void log_set_target(LogTarget target
);
47 void log_set_max_level_realm(LogRealm realm
, int level
);
48 #define log_set_max_level(level) \
49 log_set_max_level_realm(LOG_REALM, (level))
51 void log_set_facility(int facility
);
53 int log_set_target_from_string(const char *e
);
54 int log_set_max_level_from_string_realm(LogRealm realm
, const char *e
);
55 #define log_set_max_level_from_string(e) \
56 log_set_max_level_from_string_realm(LOG_REALM, (e))
58 void log_show_color(bool b
);
59 bool log_get_show_color(void) _pure_
;
60 void log_show_location(bool b
);
61 bool log_get_show_location(void) _pure_
;
63 int log_show_color_from_string(const char *e
);
64 int log_show_location_from_string(const char *e
);
66 LogTarget
log_get_target(void) _pure_
;
67 int log_get_max_level_realm(LogRealm realm
) _pure_
;
68 #define log_get_max_level() \
69 log_get_max_level_realm(LOG_REALM)
71 /* Functions below that open and close logs or configure logging based on the
72 * environment should not be called from library code — this is always a job
73 * for the application itself.
76 assert_cc(STRLEN(__FILE__
) > STRLEN(RELATIVE_SOURCE_PATH
) + 1);
77 #define PROJECT_FILE (&__FILE__[STRLEN(RELATIVE_SOURCE_PATH) + 1])
81 void log_forget_fds(void);
83 void log_parse_environment_realm(LogRealm realm
);
84 #define log_parse_environment() \
85 log_parse_environment_realm(LOG_REALM)
87 int log_dispatch_internal(
93 const char *object_field
,
96 const char *extra_field
,
99 int log_internal_realm(
105 const char *format
, ...) _printf_(6,7);
106 #define log_internal(level, ...) \
107 log_internal_realm(LOG_REALM_PLUS_LEVEL(LOG_REALM, (level)), __VA_ARGS__)
109 int log_internalv_realm(
116 va_list ap
) _printf_(6,0);
117 #define log_internalv(level, ...) \
118 log_internalv_realm(LOG_REALM_PLUS_LEVEL(LOG_REALM, (level)), __VA_ARGS__)
120 /* Realm is fixed to LOG_REALM_SYSTEMD for those */
121 int log_object_internalv(
127 const char *object_field
,
129 const char *extra_field
,
132 va_list ap
) _printf_(10,0);
134 int log_object_internal(
140 const char *object_field
,
142 const char *extra_field
,
144 const char *format
, ...) _printf_(10,11);
146 int log_struct_internal(
152 const char *format
, ...) _printf_(6,0) _sentinel_
;
154 int log_oom_internal(
160 int log_format_iovec(
164 bool newline_separator
,
167 va_list ap
) _printf_(6, 0);
169 int log_struct_iovec_internal(
175 const struct iovec
*input_iovec
,
176 size_t n_input_iovec
);
178 /* This modifies the buffer passed! */
179 int log_dump_internal(
187 /* Logging for various assertions */
188 _noreturn_
void log_assert_failed_realm(
194 #define log_assert_failed(text, ...) \
195 log_assert_failed_realm(LOG_REALM, (text), __VA_ARGS__)
197 _noreturn_
void log_assert_failed_unreachable_realm(
203 #define log_assert_failed_unreachable(text, ...) \
204 log_assert_failed_unreachable_realm(LOG_REALM, (text), __VA_ARGS__)
206 void log_assert_failed_return_realm(
212 #define log_assert_failed_return(text, ...) \
213 log_assert_failed_return_realm(LOG_REALM, (text), __VA_ARGS__)
215 #define log_dispatch(level, error, buffer) \
216 log_dispatch_internal(level, error, PROJECT_FILE, __LINE__, __func__, NULL, NULL, NULL, NULL, buffer)
218 /* Logging with level */
219 #define log_full_errno_realm(realm, level, error, ...) \
221 int _level = (level), _e = (error), _realm = (realm); \
222 (log_get_max_level_realm(_realm) >= LOG_PRI(_level)) \
223 ? log_internal_realm(LOG_REALM_PLUS_LEVEL(_realm, _level), _e, \
224 PROJECT_FILE, __LINE__, __func__, __VA_ARGS__) \
225 : -ERRNO_VALUE(_e); \
228 #define log_full_errno(level, error, ...) \
229 log_full_errno_realm(LOG_REALM, (level), (error), __VA_ARGS__)
231 #define log_full(level, ...) log_full_errno((level), 0, __VA_ARGS__)
233 int log_emergency_level(void);
236 #define log_debug(...) log_full(LOG_DEBUG, __VA_ARGS__)
237 #define log_info(...) log_full(LOG_INFO, __VA_ARGS__)
238 #define log_notice(...) log_full(LOG_NOTICE, __VA_ARGS__)
239 #define log_warning(...) log_full(LOG_WARNING, __VA_ARGS__)
240 #define log_error(...) log_full(LOG_ERR, __VA_ARGS__)
241 #define log_emergency(...) log_full(log_emergency_level(), __VA_ARGS__)
243 /* Logging triggered by an errno-like error */
244 #define log_debug_errno(error, ...) log_full_errno(LOG_DEBUG, error, __VA_ARGS__)
245 #define log_info_errno(error, ...) log_full_errno(LOG_INFO, error, __VA_ARGS__)
246 #define log_notice_errno(error, ...) log_full_errno(LOG_NOTICE, error, __VA_ARGS__)
247 #define log_warning_errno(error, ...) log_full_errno(LOG_WARNING, error, __VA_ARGS__)
248 #define log_error_errno(error, ...) log_full_errno(LOG_ERR, error, __VA_ARGS__)
249 #define log_emergency_errno(error, ...) log_full_errno(log_emergency_level(), error, __VA_ARGS__)
252 # define log_trace(...) log_debug(__VA_ARGS__)
254 # define log_trace(...) do {} while (0)
257 /* Structured logging */
258 #define log_struct_errno(level, error, ...) \
259 log_struct_internal(LOG_REALM_PLUS_LEVEL(LOG_REALM, level), \
260 error, PROJECT_FILE, __LINE__, __func__, __VA_ARGS__, NULL)
261 #define log_struct(level, ...) log_struct_errno(level, 0, __VA_ARGS__)
263 #define log_struct_iovec_errno(level, error, iovec, n_iovec) \
264 log_struct_iovec_internal(LOG_REALM_PLUS_LEVEL(LOG_REALM, level), \
265 error, PROJECT_FILE, __LINE__, __func__, iovec, n_iovec)
266 #define log_struct_iovec(level, iovec, n_iovec) log_struct_iovec_errno(level, 0, iovec, n_iovec)
268 /* This modifies the buffer passed! */
269 #define log_dump(level, buffer) \
270 log_dump_internal(LOG_REALM_PLUS_LEVEL(LOG_REALM, level), \
271 0, PROJECT_FILE, __LINE__, __func__, buffer)
273 #define log_oom() log_oom_internal(LOG_REALM, PROJECT_FILE, __LINE__, __func__)
275 bool log_on_console(void) _pure_
;
277 const char *log_target_to_string(LogTarget target
) _const_
;
278 LogTarget
log_target_from_string(const char *s
) _pure_
;
280 /* Helper to prepare various field for structured logging */
281 #define LOG_MESSAGE(fmt, ...) "MESSAGE=" fmt, ##__VA_ARGS__
283 void log_received_signal(int level
, const struct signalfd_siginfo
*si
);
285 /* If turned on, any requests for a log target involving "syslog" will be implicitly upgraded to the equivalent journal target */
286 void log_set_upgrade_syslog_to_journal(bool b
);
288 /* If turned on, and log_open() is called, we'll not use STDERR_FILENO for logging ever, but rather open /dev/console */
289 void log_set_always_reopen_console(bool b
);
291 /* If turned on, we'll open the log stream implicitly if needed on each individual log call. This is normally not
292 * desired as we want to reuse our logging streams. It is useful however */
293 void log_set_open_when_needed(bool b
);
295 /* 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
296 * stderr, the console or kmsg */
297 void log_set_prohibit_ipc(bool b
);
299 int log_dup_console(void);
301 int log_syntax_internal(
304 const char *config_file
,
305 unsigned config_line
,
310 const char *format
, ...) _printf_(9, 10);
312 int log_syntax_invalid_utf8_internal(
315 const char *config_file
,
316 unsigned config_line
,
322 #define log_syntax(unit, level, config_file, config_line, error, ...) \
324 int _level = (level), _e = (error); \
325 (log_get_max_level() >= LOG_PRI(_level)) \
326 ? log_syntax_internal(unit, _level, config_file, config_line, _e, PROJECT_FILE, __LINE__, __func__, __VA_ARGS__) \
327 : -ERRNO_VALUE(_e); \
330 #define log_syntax_invalid_utf8(unit, level, config_file, config_line, rvalue) \
332 int _level = (level); \
333 (log_get_max_level() >= LOG_PRI(_level)) \
334 ? log_syntax_invalid_utf8_internal(unit, _level, config_file, config_line, PROJECT_FILE, __LINE__, __func__, rvalue) \
338 #define DEBUG_LOGGING _unlikely_(log_get_max_level() >= LOG_DEBUG)
340 void log_setup_service(void);