logc

A simple thread safe logging library implemented in C99

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

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

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

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.

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.

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

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

Close log file stream.

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

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