ihavec / logc

A simple thread safe logging library implemented in C99

logc

A simple thread safe logging library implemented in C99

Fork of log.c

Main changes

• Fix concurrency vulnerabilities
• Thread safe by default (The code should be compiled with -pthread flag)
• Call abort() after fatal log
• Color print by default

Usage

log.c and log.h should be dropped into an existing project and compiled along with it. The library provides 6 function-like macros for logging:

log_trace(const char *fmt, ...);
log_debug(const char *fmt, ...);
log_info(const char *fmt, ...);
log_warn(const char *fmt, ...);
log_error(const char *fmt, ...);
log_fatal(const char *fmt, ...);

Each function takes a printf format string followed by additional arguments:

log_trace("Hello %s", "world")

Resulting in a line with the given format printed to stderr:

20:18:26 TRACE src/main.c:11: Hello world

Test build

gcc -o test -Wall test.c ./src/log.c -pthread

log_quiet_set(int enable)

Quiet-mode can be enabled by passing 1 to the log_set_quiet() function. While this mode is enabled the library will not output anything to stderr, but will continue to write to the file if one is set.

log_level_set(int level)

The current logging level can be set by using the log_set_level() function. All logs below the given level will be ignored. By default the level is LOG_TRACE, such that nothing is ignored.

log_multithreading(bool enable);

Multithreaded mode is enabled by default. Set false only if your program is single threaded.

log_file_open(const char* file_path)

The data written to the file output is of the following format:

2047-03-11 20:18:26 TRACE src/main.c:11: Hello world

log_file_close()

Close log file stream.

LOG_NO_USE_COLOR

If the library is compiled with -DLOG_NO_USE_COLOR ANSI color escape codes will not be used when printing.

License

This library is free software; you can redistribute it and/or modify it under the terms of the MIT license. See LICENSE for details.