/usr/src/openvswitch-1.4.0/lib/vlog.h is in openvswitch-datapath-dkms 1.4.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef VLOG_H
#define VLOG_H 1
#include <limits.h>
#include <stdarg.h>
#include <stdbool.h>
#include <time.h>
#include "compiler.h"
#include "util.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Logging severity levels.
*
* ovs-appctl(8) defines each of the log levels. */
#define VLOG_LEVELS \
VLOG_LEVEL(OFF, LOG_ALERT) \
VLOG_LEVEL(EMER, LOG_ALERT) \
VLOG_LEVEL(ERR, LOG_ERR) \
VLOG_LEVEL(WARN, LOG_WARNING) \
VLOG_LEVEL(INFO, LOG_NOTICE) \
VLOG_LEVEL(DBG, LOG_DEBUG)
enum vlog_level {
#define VLOG_LEVEL(NAME, SYSLOG_LEVEL) VLL_##NAME,
VLOG_LEVELS
#undef VLOG_LEVEL
VLL_N_LEVELS
};
const char *vlog_get_level_name(enum vlog_level);
enum vlog_level vlog_get_level_val(const char *name);
/* Facilities that we can log to. */
#define VLOG_FACILITIES \
VLOG_FACILITY(SYSLOG, "%05N|%c|%p|%m") \
VLOG_FACILITY(CONSOLE, "%d{%b %d %H:%M:%S}|%05N|%c|%p|%m") \
VLOG_FACILITY(FILE, "%d{%b %d %H:%M:%S}|%05N|%c|%p|%m")
enum vlog_facility {
#define VLOG_FACILITY(NAME, PATTERN) VLF_##NAME,
VLOG_FACILITIES
#undef VLOG_FACILITY
VLF_N_FACILITIES,
VLF_ANY_FACILITY = -1
};
const char *vlog_get_facility_name(enum vlog_facility);
enum vlog_facility vlog_get_facility_val(const char *name);
/* A log module. */
struct vlog_module {
const char *name; /* User-visible name. */
int levels[VLF_N_FACILITIES]; /* Minimum log level for each facility. */
int min_level; /* Minimum log level for any facility. */
};
/* Creates and initializes a global instance of a module named MODULE. */
#if USE_LINKER_SECTIONS
#define VLOG_DEFINE_MODULE(MODULE) \
VLOG_DEFINE_MODULE__(MODULE) \
extern struct vlog_module *vlog_module_ptr_##MODULE; \
struct vlog_module *vlog_module_ptr_##MODULE \
__attribute__((section("vlog_modules"))) = &VLM_##MODULE
#else
#define VLOG_DEFINE_MODULE(MODULE) extern struct vlog_module VLM_##MODULE
#endif
const char *vlog_get_module_name(const struct vlog_module *);
struct vlog_module *vlog_module_from_name(const char *name);
/* Rate-limiter for log messages. */
struct vlog_rate_limit {
/* Configuration settings. */
unsigned int rate; /* Tokens per second. */
unsigned int burst; /* Max cumulative tokens credit. */
/* Current status. */
unsigned int tokens; /* Current number of tokens. */
time_t last_fill; /* Last time tokens added. */
time_t first_dropped; /* Time first message was dropped. */
time_t last_dropped; /* Time of most recent message drop. */
unsigned int n_dropped; /* Number of messages dropped. */
};
/* Number of tokens to emit a message. We add 'rate' tokens per second, which
* is 60 times the unit used for 'rate', thus 60 tokens are required to emit
* one message. */
#define VLOG_MSG_TOKENS 60
/* Initializer for a struct vlog_rate_limit, to set up a maximum rate of RATE
* messages per minute and a maximum burst size of BURST messages. */
#define VLOG_RATE_LIMIT_INIT(RATE, BURST) \
{ \
RATE, /* rate */ \
(MIN(BURST, UINT_MAX / VLOG_MSG_TOKENS) \
* VLOG_MSG_TOKENS), /* burst */ \
0, /* tokens */ \
0, /* last_fill */ \
0, /* first_dropped */ \
0, /* last_dropped */ \
0, /* n_dropped */ \
}
/* Configuring how each module logs messages. */
enum vlog_level vlog_get_level(const struct vlog_module *, enum vlog_facility);
void vlog_set_levels(struct vlog_module *,
enum vlog_facility, enum vlog_level);
char *vlog_set_levels_from_string(const char *);
char *vlog_get_levels(void);
bool vlog_is_enabled(const struct vlog_module *, enum vlog_level);
bool vlog_should_drop(const struct vlog_module *, enum vlog_level,
struct vlog_rate_limit *);
void vlog_set_verbosity(const char *arg);
/* Configuring log facilities. */
void vlog_set_pattern(enum vlog_facility, const char *pattern);
const char *vlog_get_log_file(void);
int vlog_set_log_file(const char *file_name);
int vlog_reopen_log_file(void);
/* Initialization. */
void vlog_init(void);
void vlog_exit(void);
/* Functions for actual logging. */
void vlog(const struct vlog_module *, enum vlog_level, const char *format, ...)
PRINTF_FORMAT (3, 4);
void vlog_valist(const struct vlog_module *, enum vlog_level,
const char *, va_list)
PRINTF_FORMAT (3, 0);
void vlog_fatal(const struct vlog_module *, const char *format, ...)
PRINTF_FORMAT (2, 3) NO_RETURN;
void vlog_fatal_valist(const struct vlog_module *, const char *format, va_list)
PRINTF_FORMAT (2, 0) NO_RETURN;
void vlog_rate_limit(const struct vlog_module *, enum vlog_level,
struct vlog_rate_limit *, const char *, ...)
PRINTF_FORMAT (4, 5);
/* Creates and initializes a global instance of a module named MODULE, and
* defines a static variable named THIS_MODULE that points to it, for use with
* the convenience macros below. */
#define VLOG_DEFINE_THIS_MODULE(MODULE) \
VLOG_DEFINE_MODULE(MODULE); \
static struct vlog_module *const THIS_MODULE = &VLM_##MODULE
/* Convenience macros. These assume that THIS_MODULE points to a "struct
* vlog_module" for the current module, as set up by e.g. the
* VLOG_DEFINE_MODULE macro above.
*
* Guaranteed to preserve errno.
*/
#define VLOG_FATAL(...) vlog_fatal(THIS_MODULE, __VA_ARGS__)
#define VLOG_EMER(...) VLOG(VLL_EMER, __VA_ARGS__)
#define VLOG_ERR(...) VLOG(VLL_ERR, __VA_ARGS__)
#define VLOG_WARN(...) VLOG(VLL_WARN, __VA_ARGS__)
#define VLOG_INFO(...) VLOG(VLL_INFO, __VA_ARGS__)
#define VLOG_DBG(...) VLOG(VLL_DBG, __VA_ARGS__)
/* More convenience macros, for testing whether a given level is enabled in
* THIS_MODULE. When constructing a log message is expensive, this enables it
* to be skipped. */
#define VLOG_IS_ERR_ENABLED() vlog_is_enabled(THIS_MODULE, VLL_ERR)
#define VLOG_IS_WARN_ENABLED() vlog_is_enabled(THIS_MODULE, VLL_WARN)
#define VLOG_IS_INFO_ENABLED() vlog_is_enabled(THIS_MODULE, VLL_INFO)
#define VLOG_IS_DBG_ENABLED() vlog_is_enabled(THIS_MODULE, VLL_DBG)
/* Convenience macros for rate-limiting.
* Guaranteed to preserve errno.
*/
#define VLOG_ERR_RL(RL, ...) VLOG_RL(RL, VLL_ERR, __VA_ARGS__)
#define VLOG_WARN_RL(RL, ...) VLOG_RL(RL, VLL_WARN, __VA_ARGS__)
#define VLOG_INFO_RL(RL, ...) VLOG_RL(RL, VLL_INFO, __VA_ARGS__)
#define VLOG_DBG_RL(RL, ...) VLOG_RL(RL, VLL_DBG, __VA_ARGS__)
#define VLOG_DROP_ERR(RL) vlog_should_drop(THIS_MODULE, VLL_ERR, RL)
#define VLOG_DROP_WARN(RL) vlog_should_drop(THIS_MODULE, VLL_WARN, RL)
#define VLOG_DROP_INFO(RL) vlog_should_drop(THIS_MODULE, VLL_INFO, RL)
#define VLOG_DROP_DBG(RL) vlog_should_drop(THIS_MODULE, VLL_DBG, RL)
/* Macros for logging at most once per execution. */
#define VLOG_ERR_ONCE(...) VLOG_ONCE(VLL_ERR, __VA_ARGS__)
#define VLOG_WARN_ONCE(...) VLOG_ONCE(VLL_WARN, __VA_ARGS__)
#define VLOG_INFO_ONCE(...) VLOG_ONCE(VLL_INFO, __VA_ARGS__)
#define VLOG_DBG_ONCE(...) VLOG_ONCE(VLL_DBG, __VA_ARGS__)
/* Command line processing. */
#define VLOG_OPTION_ENUMS OPT_LOG_FILE
#define VLOG_LONG_OPTIONS \
{"verbose", optional_argument, NULL, 'v'}, \
{"log-file", optional_argument, NULL, OPT_LOG_FILE}
#define VLOG_OPTION_HANDLERS \
case 'v': \
vlog_set_verbosity(optarg); \
break; \
case OPT_LOG_FILE: \
vlog_set_log_file(optarg); \
break;
void vlog_usage(void);
/* Implementation details. */
#define VLOG(LEVEL, ...) \
do { \
enum vlog_level level__ = LEVEL; \
if (THIS_MODULE->min_level >= level__) { \
vlog(THIS_MODULE, level__, __VA_ARGS__); \
} \
} while (0)
#define VLOG_RL(RL, LEVEL, ...) \
do { \
enum vlog_level level__ = LEVEL; \
if (THIS_MODULE->min_level >= level__) { \
vlog_rate_limit(THIS_MODULE, level__, RL, __VA_ARGS__); \
} \
} while (0)
#define VLOG_ONCE(LEVEL, ...) \
do { \
static bool already_logged; \
if (!already_logged) { \
already_logged = true; \
vlog(THIS_MODULE, LEVEL, __VA_ARGS__); \
} \
} while (0)
#define VLOG_DEFINE_MODULE__(MODULE) \
extern struct vlog_module VLM_##MODULE; \
struct vlog_module VLM_##MODULE = \
{ \
#MODULE, /* name */ \
{ [ 0 ... VLF_N_FACILITIES - 1] = VLL_INFO }, /* levels */ \
VLL_INFO, /* min_level */ \
};
#ifdef __cplusplus
}
#endif
#endif /* vlog.h */
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