Logging framework for unix services. More...

Defines
#define	LOG_CONTEXT_DEF
	Example: Prepare dummy context pointer.
#define	LOG_CONTEXT
	Example: Reference dummy context pointer.
#define	log_error(...)
	Log error message.
#define	log_warning(...)
	Log warning message.
#define	log_stats(...)
	Log stats (liveness) message.
#define	log_info(...)
	Log info message.
#define	log_debug(...)
	Log debug message.
#define	log_noise(...)
	Log debug noise.
#define	fatal(...)
	Log and die.
#define	fatal_perror(...)
	Log strerror and die.
#define	die(...)
	Less verbose fatal()
Typedefs
typedef int(*	logging_prefix_fn_t )(enum LogLevel lev, void ctx, char dst, unsigned int dstlen)
	Signature for logging_prefix_cb.
Functions
void	reset_logging (void)
	Close open logfiles and syslog.
Variables
logging_prefix_fn_t	logging_prefix_cb
	Optional global callback for each log line.
int	cf_verbose
	Global verbosity level.
int	cf_quiet
	Toggle logging to stderr.
const char *	cf_logfile
	Logfile location, default NULL.
int	cf_syslog
	Syslog on/off.
const char *	cf_syslog_ident
	ident for syslog, if NULL syslog is disabled (default)
const char *	cf_syslog_facility
	Facility name.
enum LogLevel	cf_syslog_level
	Max log level for syslog writer.
enum LogLevel	cf_logfile_level
	Max log level for logfile writer.
enum LogLevel	cf_stderr_level
	Max log level for stderr writer.

Detailed Description

Logging framework for unix services.

Supported outputs:

syslog
log file
stderr

Logging context

It is possible to pass context info to all logging calls and later add details to log lines or to filter based on it.

Each call references 2 macros:

LOG_CONTEXT_DEF - which can define/call any variables
LOG_CONTEXT - which should return a pointer variable.

Later, global callback function logging_prefix_cb will get this pointer with destination buffer and can either add more info for log line or tell to skip logging this message.