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Diffstat (limited to 'src/basic/log.h')
| -rw-r--r-- | src/basic/log.h | 324 |
1 files changed, 324 insertions, 0 deletions
diff --git a/src/basic/log.h b/src/basic/log.h new file mode 100644 index 0000000..17438d7 --- /dev/null +++ b/src/basic/log.h @@ -0,0 +1,324 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ +#pragma once + +#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; + +/* Note to readers: << and >> have lower precedence than & and | */ +#define LOG_REALM_PLUS_LEVEL(realm, level) ((realm) << 10 | (level)) +#define LOG_REALM_REMOVE_LEVEL(realm_level) ((realm_level) >> 10) +#define SYNTHETIC_ERRNO(num) (1 << 30 | (num)) +#define IS_SYNTHETIC_ERRNO(val) ((val) >> 30 & 1) +#define ERRNO_VALUE(val) (abs(val) & 255) + +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__) \ + : -ERRNO_VALUE(_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) + +void log_setup_service(void); |