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-rw-r--r--src/basic/log.h324
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diff --git a/src/basic/log.h b/src/basic/log.h
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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);