The logging API provides four main parts (basics, filtering, threading & blackbox). More...

#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <syslog.h>
#include <string.h>
#include <qb/qbutil.h>
#include <qb/qbconfig.h>

Include dependency graph for qblog.h:

Data Structures
struct	qb_log_callsite
	An instance of this structure is created in a special ELF section at every dynamic debug callsite. More...

Macros
#define	LOG_TRACE (LOG_DEBUG + 1)

#define	QB_LOG_MAX_LEN 512

#define	QB_LOG_STRERROR_MAX_LEN 128

#define	QB_LOG_INIT_DATA(name)

#define	QB_LOG_TAG_LIBQB_MSG_BIT 31

#define	QB_LOG_TAG_LIBQB_MSG (1 << QB_LOG_TAG_LIBQB_MSG_BIT)

#define	qb_logt(priority, tags, fmt, args...)
	This is the function to generate a log message if you want to manually add tags.

#define	qb_log(priority, fmt, args...) qb_logt(priority, 0, fmt, ##args)
	This is the main function to generate a log message.

#define	qb_perror(priority, fmt, args...)
	This is similar to perror except it goes into the logging system.

#define	qb_enter() qb_log(LOG_TRACE, "ENTERING %s()", __func__)

#define	qb_leave() qb_log(LOG_TRACE, "LEAVING %s()", __func__)

#define	QB_LOG_SYSLOG 0

#define	QB_LOG_STDERR 1

#define	QB_LOG_BLACKBOX 2

#define	QB_LOG_STDOUT 3

#define	QB_LOG_TARGET_MAX 32

Typedefs
typedef const char (	qb_log_tags_stringify_fn )(uint32_t tags)

typedef void(*	qb_log_filter_fn )(struct qb_log_callsite *cs)

typedef void(*	qb_log_logger_fn )(int32_t t, struct qb_log_callsite cs, time_t timestamp, const char msg)

typedef void(*	qb_log_vlogger_fn )(int32_t t, struct qb_log_callsite *cs, time_t timestamp, va_list ap)

typedef void(*	qb_log_close_fn )(int32_t t)

typedef void(*	qb_log_reload_fn )(int32_t t)

Functions
struct qb_log_callsite	__attribute__ ((aligned(8)))

void	qb_log_real_ (struct qb_log_callsite *cs,...)
	Internal function: use qb_log() or qb_logt()

void	qb_log_real_va_ (struct qb_log_callsite *cs, va_list ap)

void	qb_log_from_external_source (const char function, const char filename, const char *format, uint8_t priority, uint32_t lineno, uint32_t tags,...)
	This function is to import logs from other code (like libraries) that provide a callback with their logs.

struct qb_log_callsite *	qb_log_callsite_get (const char function, const char filename, const char *format, uint8_t priority, uint32_t lineno, uint32_t tags)
	Get or create a callsite at the give position.

void	qb_log_from_external_source_va (const char function, const char filename, const char *format, uint8_t priority, uint32_t lineno, uint32_t tags, va_list ap)

void	qb_log_init (const char *name, int32_t facility, uint8_t priority)
	Init the logging system.

void	qb_log_fini (void)
	Logging system finalization function.

int32_t	qb_log_callsites_register (struct qb_log_callsite _start, struct qb_log_callsite _stop)
	If you are using dynamically loadable modules via dlopen() and you load them after qb_log_init() then after you load the module you will need to do the following to get the filters to work in that module.

void	qb_log_callsites_dump (void)
	Dump the callsite info to stdout.

int32_t	qb_log_ctl (int32_t target, enum qb_log_conf conf_type, int32_t arg)
	Main logging control function.

int32_t	qb_log_filter_ctl (int32_t value, enum qb_log_filter_conf c, enum qb_log_filter_type type, const char *text, uint8_t low_priority)
	This allows you modify the 'tags' and 'targets' callsite fields at runtime.

int32_t	qb_log_filter_ctl2 (int32_t value, enum qb_log_filter_conf c, enum qb_log_filter_type type, const char *text, uint8_t high_priority, uint8_t low_priority)
	This extends qb_log_filter_ctl() by been able to provide a high_priority.

int32_t	qb_log_filter_fn_set (qb_log_filter_fn fn)
	Instead of using the qb_log_filter_ctl() functions you can apply the filters manually by defining a callback and setting the targets field using qb_bit_set() and qb_bit_clear() like the following below.

void	qb_log_tags_stringify_fn_set (qb_log_tags_stringify_fn fn)
	Set the callback to map the 'tags' bit map to a string.

void	qb_log_format_set (int32_t t, const char *format)
	Set the format specifiers.

int32_t	qb_log_file_open (const char *filename)
	Open a log file.

void	qb_log_file_close (int32_t t)
	Close a log file and release is resources.

int32_t	qb_log_thread_priority_set (int32_t policy, int32_t priority)
	When using threaded logging set the pthread policy and priority.

int32_t	qb_log_thread_start (void)
	Start the logging pthread.

ssize_t	qb_log_blackbox_write_to_file (const char *filename)
	Write the blackbox to file.

void	qb_log_blackbox_print_from_file (const char *filename)
	Read the blackbox for file and print it out.

int32_t	qb_log_custom_open (qb_log_logger_fn log_fn, qb_log_close_fn close_fn, qb_log_reload_fn reload_fn, void *user_data)
	Open a custom log target.

void	qb_log_custom_close (int32_t t)
	Close a custom log target and release is resources.

void *	qb_log_target_user_data_get (int32_t t)
	Retrieve the user data set by either qb_log_custom_open or qb_log_target_user_data_set.

int32_t	qb_log_target_user_data_set (int32_t t, void *user_data)
	Associate user data with this log target.

void	qb_log_target_format (int32_t target, struct qb_log_callsite cs, time_t timestamp, const char formatted_message, char *output_buffer)
	format the callsite and timestamp info according to the format set using qb_log_format_set() It is intended to be used from your custom logger function.

int32_t	qb_log_facility2int (const char *fname)
	Convert string "auth" to equivalent number "LOG_AUTH" etc.

const char *	qb_log_facility2str (int32_t fnum)
	Convert number "LOG_AUTH" to equivalent string "auth" etc.

Variables
const char *	function

const char *	filename

const char *	format

uint8_t	priority

uint32_t	lineno

uint32_t	targets

uint32_t	tags

struct qb_log_callsite	__start___verbose []

struct qb_log_callsite	__stop___verbose []

enum qb_log_target_state	__attribute__

Detailed Description

The logging API provides four main parts (basics, filtering, threading & blackbox).

The idea behind this logging system is not to be prescriptive but to provide a set of tools to help the developer achieve what they want quickly and easily.

Basic logging API.: Call qb_log() to generate a log message. Then to write the message somewhere meaningful call qb_log_ctl() to configure the targets.

Simplist possible use:

main() {
     qb_log_init("simple-log", LOG_DAEMON, LOG_INFO);
        // ...
     qb_log(LOG_WARNING, "watch out");
        // ...
     qb_log_fini();
}

Configuring log targets.: A log target can by syslog, stderr, the blackbox or a text file. By default only syslog is enabled.

To enable a target do the following

qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_ENABLED, QB_TRUE);

syslog, stderr and the blackbox are static (they don't need to be created, just enabled or disabled. However you can open multiple logfiles (32 - QB_LOG_BLACKBOX). To do this use the following code.

mytarget = qb_log_file_open("/var/log/mylogfile");

qb_log_ctl(mytarget, QB_LOG_CONF_ENABLED, QB_TRUE);

Once your targets are enabled/opened you can configure them as follows: Configure the size of blackbox

qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_SIZE, 1024*10);

Make logging to file threaded:

qb_log_ctl(mytarget, QB_LOG_CONF_THREADED, QB_TRUE);

To workaround your syslog daemon filtering all messages > LOG_INFO

qb_log_ctl(QB_LOG_SYSLOG, QB_LOG_CONF_PRIORITY_BUMP,

LOG_INFO - LOG_DEBUG);

To ensure all logs to file targets are fsync'ed (default QB_FALSE)

qb_log_ctl(mytarget, QB_LOG_CONF_FILE_SYNC, QB_TRUE);

Filtering messages.

To have more power over what log messages go to which target you can apply filters to the targets. What happens is the desired callsites have the correct bit set. Then when the log message is generated it gets sent to the targets based on which bit is set in the callsite's "target" bitmap. Messages can be filtered based on the:

filename + priority
function name + priority
format string + priority

So to make all logs from evil_fnunction() go to stderr do the following:

qb_log_filter_ctl(QB_LOG_STDERR, QB_LOG_FILTER_ADD,

QB_LOG_FILTER_FUNCTION, "evil_fnunction", LOG_TRACE);

So to make all logs from totem* (with a priority <= LOG_INFO) go to stderr do the following:

qb_log_filter_ctl(QB_LOG_STDERR, QB_LOG_FILTER_ADD,

QB_LOG_FILTER_FILE, "totem", LOG_INFO);

So to make all logs with the substring "ringbuffer" go to stderr do the following:

qb_log_filter_ctl(QB_LOG_STDERR, QB_LOG_FILTER_ADD,

QB_LOG_FILTER_FORMAT, "ringbuffer", LOG_TRACE);

Threaded logging.: To achieve non-blocking logging you can use threaded logging. So any calls to write() or syslog() will not hold up your program.

Threaded logging use:

main() {
     qb_log_init("simple-log", LOG_DAEMON, LOG_INFO);
     qb_log_ctl(QB_LOG_SYSLOG, QB_LOG_CONF_THREADED, QB_TRUE);
        // ...
        daemonize();
        // call this after you fork()
        qb_log_thread_start();
        // ...
     qb_log(LOG_WARNING, "watch out");
        // ...
     qb_log_fini();
}

A blackbox for in-field diagnosis.: This stores log messages in a ringbuffer so they can be written to file if the program crashes (you will need to catch SIGSEGV). These can then be easily printed out later.

Note: the blackbox is not enabled by default.

Blackbox usage:

static void sigsegv_handler(int sig)
{
        (void)signal (SIGSEGV, SIG_DFL);
        qb_log_blackbox_write_to_file("simple-log.fdata");
        qb_log_fini();
        raise(SIGSEGV);
}
main() {
     signal(SIGSEGV, sigsegv_handler);
     qb_log_init("simple-log", LOG_DAEMON, LOG_INFO);
     qb_log_filter_ctl(QB_LOG_BLACKBOX, QB_LOG_FILTER_ADD,
                  QB_LOG_FILTER_FILE, "*", LOG_DEBUG);
     qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_SIZE, 1024*10);
     qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_ENABLED, QB_TRUE);
        // ...
     qb_log(LOG_WARNING, "watch out");
        // ...
     qb_log_fini();
}

Tagging messages.: You can tag messages using the second argument to qb_logt() or by using qb_log_filter_ctl(). This can be used to add feature or sub-system information to the logs.

const char* my_tags_stringify(uint32_t tags) {
        if (qb_bit_is_set(tags, QB_LOG_TAG_LIBQB_MSG_BIT) {
                return "libqb";
        } else if (tags == 3) {
                return "three";
        } else {
                return "MAIN";
        }
}
main() {
        // ...
        qb_log_tags_stringify_fn_set(my_tags_stringify);
        qb_log_format_set(QB_LOG_STDERR, "[%5g] %p %b");
        // ...
        qb_logt(LOG_INFO, 3, "hello");
        qb_logt(LOG_INFO, 0, "hello");
}

The code above will produce:

[libqb] some message
[three] info hello
[MAIN ] info hello

Macro Definition Documentation

#define LOG_TRACE (LOG_DEBUG + 1)

Examples:: ipcclient.c, ipcserver.c, and simplelog.c.

#define qb_enter ( ) qb_log(LOG_TRACE, "ENTERING %s()", __func__)

Examples:: simplelog.c.

#define qb_leave ( ) qb_log(LOG_TRACE, "LEAVING %s()", __func__)

Examples:: simplelog.c.

#define qb_log	(	priority,
		fmt,
		args...
	)	qb_logt(priority, 0, fmt, ##args)

This is the main function to generate a log message.

Parameters

priority	this takes syslog priorities.
fmt	usual printf style format specifiers
args	usual printf style args

Examples:: ipcserver.c, and simplelog.c.

#define QB_LOG_BLACKBOX 2

Examples:: simplelog.c.

#define QB_LOG_INIT_DATA ( name )

Value:

void name(void);                                                        \
    void name(void) { if (__start___verbose != __stop___verbose) {assert(1);} } \
    void __attribute__ ((constructor)) name(void);

#define QB_LOG_MAX_LEN 512

Examples:: simplelog.c.

#define QB_LOG_STDERR 1

Examples:: ipcclient.c, ipcserver.c, and simplelog.c.

#define QB_LOG_STDOUT 3

Examples:: simplelog.c.

#define QB_LOG_STRERROR_MAX_LEN 128

#define QB_LOG_SYSLOG 0

Examples:: ipcclient.c, and simplelog.c.

#define QB_LOG_TAG_LIBQB_MSG (1 << QB_LOG_TAG_LIBQB_MSG_BIT)

#define QB_LOG_TAG_LIBQB_MSG_BIT 31

Examples:: simplelog.c.

#define QB_LOG_TARGET_MAX 32

#define qb_logt	(	priority,
		tags,
		fmt,
		args...
	)

Value:

do {                    \
        static struct qb_log_callsite descriptor                        \
        __attribute__((section("__verbose"), aligned(8))) =             \
        { __func__, __FILE__, fmt, priority, __LINE__, 0, tags };       \
        qb_log_real_(&descriptor, ##args);                              \
    } while(0)

This is the function to generate a log message if you want to manually add tags.

Parameters

priority	this takes syslog priorities.
tags	this is a uint32_t that you can use with qb_log_tags_stringify_fn_set() to "tag" a log message with a feature or sub-system then you can use "%g" in the format specifer to print it out.
fmt	usual printf style format specifiers
args	usual printf style args

Examples:: simplelog.c.

#define qb_perror	(	priority,
		fmt,
		args...
	)

Value:

do {                            \
        char _perr_buf_[QB_LOG_STRERROR_MAX_LEN];                       \
        const char *_perr_str_ = qb_strerror_r(errno, _perr_buf_, sizeof(_perr_buf_));  \
        qb_logt(priority, 0, fmt ": %s (%d)", ##args, _perr_str_, errno);               \
    } while(0)

This is similar to perror except it goes into the logging system.

Parameters

priority	this takes syslog priorities.
fmt	usual printf style format specifiers
args	usual printf style args

Examples:: ipcserver.c, and simplelog.c.

Typedef Documentation

typedef void(* qb_log_close_fn)(int32_t t)

typedef void(* qb_log_filter_fn)(struct qb_log_callsite *cs)

typedef void(* qb_log_logger_fn)(int32_t t, struct qb_log_callsite *cs, time_t timestamp, const char *msg)

typedef void(* qb_log_reload_fn)(int32_t t)

typedef const char*(* qb_log_tags_stringify_fn)(uint32_t tags)

typedef void(* qb_log_vlogger_fn)(int32_t t, struct qb_log_callsite *cs, time_t timestamp, va_list ap)

Enumeration Type Documentation

enum qb_log_conf

Enumerator
QB_LOG_CONF_ENABLED
QB_LOG_CONF_FACILITY
QB_LOG_CONF_DEBUG
QB_LOG_CONF_SIZE
QB_LOG_CONF_THREADED
QB_LOG_CONF_PRIORITY_BUMP
QB_LOG_CONF_STATE_GET
QB_LOG_CONF_FILE_SYNC

enum qb_log_filter_conf

Enumerator
QB_LOG_FILTER_ADD
QB_LOG_FILTER_REMOVE
QB_LOG_FILTER_CLEAR_ALL
QB_LOG_TAG_SET
QB_LOG_TAG_CLEAR
QB_LOG_TAG_CLEAR_ALL

enum qb_log_filter_type

Enumerator
QB_LOG_FILTER_FILE
QB_LOG_FILTER_FUNCTION
QB_LOG_FILTER_FORMAT

enum qb_log_target_state

Enumerator
QB_LOG_STATE_UNUSED
QB_LOG_STATE_DISABLED
QB_LOG_STATE_ENABLED

Function Documentation

struct qb_log_callsite __attribute__ ( (aligned(8)) )

void qb_log_blackbox_print_from_file ( const char * filename )

Read the blackbox for file and print it out.

Examples:: simplelog.c.

ssize_t qb_log_blackbox_write_to_file ( const char * filename )

Write the blackbox to file.

Examples:: simplelog.c.

struct qb_log_callsite* qb_log_callsite_get	(	const char *	function,
		const char *	filename,
		const char *	format,
		uint8_t	priority,
		uint32_t	lineno,
		uint32_t	tags
	)

read

Get or create a callsite at the give position.

The result can then be passed into qb_log_real_()

Parameters

function	originating function name
filename	originating filename
format	format string
priority	this takes syslog priorities.
lineno	file line number
tags	the tag

void qb_log_callsites_dump ( void )

Dump the callsite info to stdout.

int32_t qb_log_callsites_register	(	struct qb_log_callsite *	_start,
		struct qb_log_callsite *	_stop
	)

If you are using dynamically loadable modules via dlopen() and you load them after qb_log_init() then after you load the module you will need to do the following to get the filters to work in that module.

   _start = dlsym (dl_handle, "__start___verbose");
_stop = dlsym (dl_handle, "__stop___verbose");
qb_log_callsites_register(_start, _stop);

int32_t qb_log_ctl	(	int32_t	target,
		enum qb_log_conf	conf_type,
		int32_t	arg
	)

Main logging control function.

Parameters

target	QB_LOG_SYSLOG, QB_LOG_STDERR or result from qb_log_file_open()
conf_type	what to configure
arg	the new value

See Also: qb_log_conf

Return values

-errno	on error
0	on success
qb_log_target_state	for QB_LOG_CONF_STATE_GET

Examples:: ipcclient.c, ipcserver.c, and simplelog.c.

void qb_log_custom_close ( int32_t t )

Close a custom log target and release is resources.

int32_t qb_log_custom_open	(	qb_log_logger_fn	log_fn,
		qb_log_close_fn	close_fn,
		qb_log_reload_fn	reload_fn,
		void *	user_data
	)

Open a custom log target.

Return values

-errno	on error
3	to 31 (to be passed into other qb_log_* functions)

Examples:: simplelog.c.

int32_t qb_log_facility2int ( const char * fname )

Convert string "auth" to equivalent number "LOG_AUTH" etc.

const char* qb_log_facility2str ( int32_t fnum )

Convert number "LOG_AUTH" to equivalent string "auth" etc.

void qb_log_file_close ( int32_t t )

Close a log file and release is resources.

int32_t qb_log_file_open ( const char * filename )

Open a log file.

Return values

-errno	on error
3	to 31 (to be passed into other qb_log_* functions)

Examples:: simplelog.c.

int32_t qb_log_filter_ctl	(	int32_t	value,
		enum qb_log_filter_conf	c,
		enum qb_log_filter_type	type,
		const char *	text,
		uint8_t	low_priority
	)

This allows you modify the 'tags' and 'targets' callsite fields at runtime.

Examples:: ipcclient.c, ipcserver.c, and simplelog.c.

int32_t qb_log_filter_ctl2	(	int32_t	value,
		enum qb_log_filter_conf	c,
		enum qb_log_filter_type	type,
		const char *	text,
		uint8_t	high_priority,
		uint8_t	low_priority
	)

This extends qb_log_filter_ctl() by been able to provide a high_priority.

Examples:: simplelog.c.

int32_t qb_log_filter_fn_set ( qb_log_filter_fn fn )

Instead of using the qb_log_filter_ctl() functions you can apply the filters manually by defining a callback and setting the targets field using qb_bit_set() and qb_bit_clear() like the following below.

static void
m_filter(struct qb_log_callsite *cs)
{
        if ((cs->priority >= LOG_ALERT &&
             cs->priority <= LOG_DEBUG) &&
             strcmp(cs->filename, "my_c_file.c") == 0) {
                qb_bit_set(cs->targets, QB_LOG_SYSLOG);
        } else {
                qb_bit_clear(cs->targets, QB_LOG_SYSLOG);
        }
}

Examples:: simplelog.c.

void qb_log_fini ( void )

Logging system finalization function.

It releases any shared memory. Stops the logging thread if running. Flushes the last message to their destinations.

Examples:: simplelog.c.

void qb_log_format_set	(	int32_t	t,
		const char *	format
	)

Set the format specifiers.

n FUNCTION NAME f FILENAME l FILELINE p PRIORITY t TIMESTAMP b BUFFER g TAGS N name (passed into qb_log_init) P PID H hostname

any number between % and character specify field length to pad or chop

Examples:: ipcclient.c, ipcserver.c, and simplelog.c.

void qb_log_from_external_source	(	const char *	function,
		const char *	filename,
		const char *	format,
		uint8_t	priority,
		uint32_t	lineno,
		uint32_t	tags,
			...
	)

This function is to import logs from other code (like libraries) that provide a callback with their logs.

Note: the performance of this will not impress you, as the filtering is done on each log message, not before hand. So try doing basic pre-filtering.

Parameters

function	originating function name
filename	originating filename
format	format string
priority	this takes syslog priorities.
lineno	file line number
tags	this is a uint32_t that you can use with qb_log_tags_stringify_fn_set() to "tag" a log message with a feature or sub-system then you can use "%g" in the format specifer to print it out.

void qb_log_from_external_source_va	(	const char *	function,
		const char *	filename,
		const char *	format,
		uint8_t	priority,
		uint32_t	lineno,
		uint32_t	tags,
		va_list	ap
	)

void qb_log_init	(	const char *	name,
		int32_t	facility,
		uint8_t	priority
	)

Init the logging system.

Parameters

name	will be passed into openlog()
facility	default for all new targets.
priority	a basic filter with this priority will be added.

Examples:: ipcclient.c, ipcserver.c, and simplelog.c.

void qb_log_real_	(	struct qb_log_callsite *	cs,
			...
	)

Internal function: use qb_log() or qb_logt()

void qb_log_real_va_	(	struct qb_log_callsite *	cs,
		va_list	ap
	)

void qb_log_tags_stringify_fn_set ( qb_log_tags_stringify_fn fn )

Set the callback to map the 'tags' bit map to a string.

Examples:: simplelog.c.

void qb_log_target_format	(	int32_t	target,
		struct qb_log_callsite *	cs,
		time_t	timestamp,
		const char *	formatted_message,
		char *	output_buffer
	)

format the callsite and timestamp info according to the format set using qb_log_format_set() It is intended to be used from your custom logger function.

Examples:: simplelog.c.

void* qb_log_target_user_data_get ( int32_t t )

Retrieve the user data set by either qb_log_custom_open or qb_log_target_user_data_set.

int32_t qb_log_target_user_data_set	(	int32_t	t,
		void *	user_data
	)

Associate user data with this log target.

Note: only use this with custom targets

int32_t qb_log_thread_priority_set	(	int32_t	policy,
		int32_t	priority
	)

When using threaded logging set the pthread policy and priority.

Return values

-errno	on error
0	success

int32_t qb_log_thread_start ( void )

Start the logging pthread.

Examples:: simplelog.c.

Variable Documentation

enum qb_log_target_state __attribute__

struct qb_log_callsite __start___verbose[]

struct qb_log_callsite __stop___verbose[]

const char* filename

const char* format

const char* function

uint32_t lineno

uint8_t priority

uint32_t tags

Examples:: simplelog.c.

uint32_t targets

Enumerations
enum	qb_log_target_state { QB_LOG_STATE_UNUSED = 1, QB_LOG_STATE_DISABLED = 2, QB_LOG_STATE_ENABLED = 3 }

enum	qb_log_conf { QB_LOG_CONF_ENABLED, QB_LOG_CONF_FACILITY, QB_LOG_CONF_DEBUG, QB_LOG_CONF_SIZE, QB_LOG_CONF_THREADED, QB_LOG_CONF_PRIORITY_BUMP, QB_LOG_CONF_STATE_GET, QB_LOG_CONF_FILE_SYNC }

enum	qb_log_filter_type { QB_LOG_FILTER_FILE, QB_LOG_FILTER_FUNCTION, QB_LOG_FILTER_FORMAT }

enum	qb_log_filter_conf { QB_LOG_FILTER_ADD, QB_LOG_FILTER_REMOVE, QB_LOG_FILTER_CLEAR_ALL, QB_LOG_TAG_SET, QB_LOG_TAG_CLEAR, QB_LOG_TAG_CLEAR_ALL }

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