#include <nng/nng.h>
typedef void (*nng_logger)(nng_log_level level, nng_log_facility facility,
const char *msgid, const char *msg);
void nng_null_logger(nng_log_level, nng_log_facility, const char *, const char *);
void nng_stderr_logger(nng_log_level, nng_log_facility, const char *, const char *);
void nng_system_logger(nng_log_level, nng_log_facility, const char *, const char *);
void nng_log_set_logger(nng_logger logger);| This documentation is for the TIP (development tree) of NNG and may represent unreleased changes or functionality that is experimental, and is subject to change before release. The latest released version is v1.8.0. See the documentation for v1.8.0 for the most up-to-date information. |
nng_log_set_logger(3)
NAME
nng_log_set_logger - set logging handler
SYNOPSIS
DESCRIPTION
The nng_log_set_logger is used to set the base logging function to logger.
The logger may be a user defined function to process log messages.
Only a single logger may be registered at a time.
If needed, the logger should make copies of either msgid or msg, as those may not be valid once the logger function returns.
The nng_null_logger function is an implementation of nng_logger that simply discards the content.
This is the default logger, so logging is disabled by default.
The nng_stderr_logger function is an implementation that logs messages to the standard error stream.
It will attempt to colorize messages by the severity, if the standard error is a terminal device.
This can be supressed by setting either the NO_COLOR or NNG_LOG_NO_COLOR environment variables.
The nng_system_logger attempts to use an appropriate system facility to log messages.
For POSIX systems, this means using syslog to process the messages.
For other the nng_stderr_log may be used as a fallback.