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/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
/***
Copyright 2010 Lennart Poettering
***/
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <syslog.h>
#include "macro.h"
/* Some structures we reference but don't want to pull in headers for */
struct iovec;
struct signalfd_siginfo;
typedef enum LogRealm {
LOG_REALM_SYSTEMD,
LOG_REALM_UDEV,
_LOG_REALM_MAX,
} LogRealm;
#ifndef LOG_REALM
# define LOG_REALM LOG_REALM_SYSTEMD
#endif
typedef enum LogTarget{
LOG_TARGET_CONSOLE,
LOG_TARGET_CONSOLE_PREFIXED,
LOG_TARGET_KMSG,
LOG_TARGET_JOURNAL,
LOG_TARGET_JOURNAL_OR_KMSG,
LOG_TARGET_SYSLOG,
LOG_TARGET_SYSLOG_OR_KMSG,
LOG_TARGET_AUTO, /* console if stderr is tty, JOURNAL_OR_KMSG otherwise */
LOG_TARGET_NULL,
_LOG_TARGET_MAX,
_LOG_TARGET_INVALID = -1
} LogTarget;
#define LOG_REALM_PLUS_LEVEL(realm, level) \
((realm) << 10 | (level))
#define LOG_REALM_REMOVE_LEVEL(realm_level) \
((realm_level >> 10))
void log_set_target(LogTarget target);
void log_set_max_level_realm(LogRealm realm, int level);
#define log_set_max_level(level) \
log_set_max_level_realm(LOG_REALM, (level))
void log_set_facility(int facility);
int log_set_target_from_string(const char *e);
int log_set_max_level_from_string_realm(LogRealm realm, const char *e);
#define log_set_max_level_from_string(e) \
log_set_max_level_from_string_realm(LOG_REALM, (e))
void log_show_color(bool b);
bool log_get_show_color(void) _pure_;
void log_show_location(bool b);
bool log_get_show_location(void) _pure_;
int log_show_color_from_string(const char *e);
int log_show_location_from_string(const char *e);
LogTarget log_get_target(void) _pure_;
int log_get_max_level_realm(LogRealm realm) _pure_;
#define log_get_max_level() \
log_get_max_level_realm(LOG_REALM)
/* Functions below that open and close logs or configure logging based on the
* environment should not be called from library code — this is always a job
* for the application itself.
*/
int log_open(void);
void log_close(void);
void log_forget_fds(void);
void log_parse_environment_realm(LogRealm realm);
#define log_parse_environment() \
log_parse_environment_realm(LOG_REALM)
int log_dispatch_internal(
int level,
int error,
const char *file,
int line,
const char *func,
const char *object_field,
const char *object,
const char *extra,
const char *extra_field,
char *buffer);
int log_internal_realm(
int level,
int error,
const char *file,
int line,
const char *func,
const char *format, ...) _printf_(6,7);
#define log_internal(level, ...) \
log_internal_realm(LOG_REALM_PLUS_LEVEL(LOG_REALM, (level)), __VA_ARGS__)
int log_internalv_realm(
int level,
int error,
const char *file,
int line,
const char *func,
const char *format,
va_list ap) _printf_(6,0);
#define log_internalv(level, ...) \
log_internalv_realm(LOG_REALM_PLUS_LEVEL(LOG_REALM, (level)), __VA_ARGS__)
/* Realm is fixed to LOG_REALM_SYSTEMD for those */
int log_object_internal(
int level,
int error,
const char *file,
int line,
const char *func,
const char *object_field,
const char *object,
const char *extra_field,
const char *extra,
const char *format, ...) _printf_(10,11);
int log_struct_internal(
int level,
int error,
const char *file,
int line,
const char *func,
const char *format, ...) _printf_(6,0) _sentinel_;
int log_oom_internal(
LogRealm realm,
const char *file,
int line,
const char *func);
int log_format_iovec(
struct iovec *iovec,
size_t iovec_len,
size_t *n,
bool newline_separator,
int error,
const char *format,
va_list ap) _printf_(6, 0);
int log_struct_iovec_internal(
int level,
int error,
const char *file,
int line,
const char *func,
const struct iovec *input_iovec,
size_t n_input_iovec);
/* This modifies the buffer passed! */
int log_dump_internal(
int level,
int error,
const char *file,
int line,
const char *func,
char *buffer);
/* Logging for various assertions */
_noreturn_ void log_assert_failed_realm(
LogRealm realm,
const char *text,
const char *file,
int line,
const char *func);
#define log_assert_failed(text, ...) \
log_assert_failed_realm(LOG_REALM, (text), __VA_ARGS__)
_noreturn_ void log_assert_failed_unreachable_realm(
LogRealm realm,
const char *text,
const char *file,
int line,
const char *func);
#define log_assert_failed_unreachable(text, ...) \
log_assert_failed_unreachable_realm(LOG_REALM, (text), __VA_ARGS__)
void log_assert_failed_return_realm(
LogRealm realm,
const char *text,
const char *file,
int line,
const char *func);
#define log_assert_failed_return(text, ...) \
log_assert_failed_return_realm(LOG_REALM, (text), __VA_ARGS__)
#define log_dispatch(level, error, buffer) \
log_dispatch_internal(level, error, __FILE__, __LINE__, __func__, NULL, NULL, NULL, NULL, buffer)
/* Logging with level */
#define log_full_errno_realm(realm, level, error, ...) \
({ \
int _level = (level), _e = (error), _realm = (realm); \
(log_get_max_level_realm(_realm) >= LOG_PRI(_level)) \
? log_internal_realm(LOG_REALM_PLUS_LEVEL(_realm, _level), _e, \
__FILE__, __LINE__, __func__, __VA_ARGS__) \
: -abs(_e); \
})
#define log_full_errno(level, error, ...) \
log_full_errno_realm(LOG_REALM, (level), (error), __VA_ARGS__)
#define log_full(level, ...) log_full_errno((level), 0, __VA_ARGS__)
int log_emergency_level(void);
/* Normal logging */
#define log_debug(...) log_full(LOG_DEBUG, __VA_ARGS__)
#define log_info(...) log_full(LOG_INFO, __VA_ARGS__)
#define log_notice(...) log_full(LOG_NOTICE, __VA_ARGS__)
#define log_warning(...) log_full(LOG_WARNING, __VA_ARGS__)
#define log_error(...) log_full(LOG_ERR, __VA_ARGS__)
#define log_emergency(...) log_full(log_emergency_level(), __VA_ARGS__)
/* Logging triggered by an errno-like error */
#define log_debug_errno(error, ...) log_full_errno(LOG_DEBUG, error, __VA_ARGS__)
#define log_info_errno(error, ...) log_full_errno(LOG_INFO, error, __VA_ARGS__)
#define log_notice_errno(error, ...) log_full_errno(LOG_NOTICE, error, __VA_ARGS__)
#define log_warning_errno(error, ...) log_full_errno(LOG_WARNING, error, __VA_ARGS__)
#define log_error_errno(error, ...) log_full_errno(LOG_ERR, error, __VA_ARGS__)
#define log_emergency_errno(error, ...) log_full_errno(log_emergency_level(), error, __VA_ARGS__)
#ifdef LOG_TRACE
# define log_trace(...) log_debug(__VA_ARGS__)
#else
# define log_trace(...) do {} while (0)
#endif
/* Structured logging */
#define log_struct_errno(level, error, ...) \
log_struct_internal(LOG_REALM_PLUS_LEVEL(LOG_REALM, level), \
error, __FILE__, __LINE__, __func__, __VA_ARGS__, NULL)
#define log_struct(level, ...) log_struct_errno(level, 0, __VA_ARGS__)
#define log_struct_iovec_errno(level, error, iovec, n_iovec) \
log_struct_iovec_internal(LOG_REALM_PLUS_LEVEL(LOG_REALM, level), \
error, __FILE__, __LINE__, __func__, iovec, n_iovec)
#define log_struct_iovec(level, iovec, n_iovec) log_struct_iovec_errno(level, 0, iovec, n_iovec)
/* This modifies the buffer passed! */
#define log_dump(level, buffer) \
log_dump_internal(LOG_REALM_PLUS_LEVEL(LOG_REALM, level), \
0, __FILE__, __LINE__, __func__, buffer)
#define log_oom() log_oom_internal(LOG_REALM, __FILE__, __LINE__, __func__)
bool log_on_console(void) _pure_;
const char *log_target_to_string(LogTarget target) _const_;
LogTarget log_target_from_string(const char *s) _pure_;
/* Helper to prepare various field for structured logging */
#define LOG_MESSAGE(fmt, ...) "MESSAGE=" fmt, ##__VA_ARGS__
void log_received_signal(int level, const struct signalfd_siginfo *si);
/* If turned on, any requests for a log target involving "syslog" will be implicitly upgraded to the equivalent journal target */
void log_set_upgrade_syslog_to_journal(bool b);
/* If turned on, and log_open() is called, we'll not use STDERR_FILENO for logging ever, but rather open /dev/console */
void log_set_always_reopen_console(bool b);
/* If turned on, we'll open the log stream implicitly if needed on each individual log call. This is normally not
* desired as we want to reuse our logging streams. It is useful however */
void log_set_open_when_needed(bool b);
/* 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
* stderr, the console or kmsg */
void log_set_prohibit_ipc(bool b);
int log_dup_console(void);
int log_syntax_internal(
const char *unit,
int level,
const char *config_file,
unsigned config_line,
int error,
const char *file,
int line,
const char *func,
const char *format, ...) _printf_(9, 10);
int log_syntax_invalid_utf8_internal(
const char *unit,
int level,
const char *config_file,
unsigned config_line,
const char *file,
int line,
const char *func,
const char *rvalue);
#define log_syntax(unit, level, config_file, config_line, error, ...) \
({ \
int _level = (level), _e = (error); \
(log_get_max_level() >= LOG_PRI(_level)) \
? log_syntax_internal(unit, _level, config_file, config_line, _e, __FILE__, __LINE__, __func__, __VA_ARGS__) \
: -abs(_e); \
})
#define log_syntax_invalid_utf8(unit, level, config_file, config_line, rvalue) \
({ \
int _level = (level); \
(log_get_max_level() >= LOG_PRI(_level)) \
? log_syntax_invalid_utf8_internal(unit, _level, config_file, config_line, __FILE__, __LINE__, __func__, rvalue) \
: -EINVAL; \
})
#define DEBUG_LOGGING _unlikely_(log_get_max_level() >= LOG_DEBUG)
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