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Systemd/src/basic/log.h
Alan Jenkins cc2b9e6b20 rationalize interface for opening/closing logging 
log_open_console() did not switch from stderr to /dev/console, when
"always_reopen_console" was set.  It was necessary to call
log_close_console() first.

By contrast, log_open() did switch between e.g. journald and kmsg according
to the value of "prohibit_ipc".

Let's fix log_open() to respect the values of all the log options, and we
can make log_close_*() private.

Also log_close_console() is changed.  There was some precaution, avoiding
closing the console fd if we are not PID 1.  I think commit 48a601fe made
a little mistake in leaving this in, and it only served to confuse
readers :).

Also I changed systemd-shutdown. Now we have log_set_prohibit_ipc(), let's
use it to clarify that systemd-shutdown is not expected to try and log via
journald (which it is about to kill).  We avoided ever asking it to, but
it's more convenient for the reader if they don't have to think about that.
In that sense, it's similar to using assert() to validate a function's
arguments.
2018-01-27 18:01:51 +00:00

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/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#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_object_internalv(
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,
va_list ap) _printf_(10,0);
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__)
#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_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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