logging-daemon

A program which is taking care of system logs on the Linux System.

Functionality:

The main actions of this program are:

• Creating (owns) a unix socket /dev/log with a read and writes permissions for anybody.
• Reading logs from the socket and write them to the files provided on the command line.
• Printing logs to STDOUT.
• Detecting duplicate logs.
• Handling SIGINT therefore it prints the most frequent message before exit.
• Accepting -f option, so that it forks itself to the background.
• When using -f it writes /var/run/logging-daemon.pid file with its PID after forking and it will remove /var/run/logging-daemon.pid when it is killed.

Quick Start:

Once you have cloned the project in your local directory execute:

$ cmake -H. -Bbuild

This command will configure the build environment and it will create the build folder where the executable files will be placed.

You can complie the code using:

$ cmake --build build

The executable file, named logging-daemon, will be placed in the build/ directory.

Before running the program you need to do:

# systemctl stop rsyslog
# systemctl stop systemd-journald
# unlink /dev/log

You can run the program as follow:

$ sudo ./logging-daemon -f /tmp/output1.log /tmp/output2.log /tmp/output3.log

You can log messages using logger command as follow:

$ logger hello
$ logger good bye
$ logger hello
$ logger hello again
$ logger hello
$ logger bye bye

You can stop the daemon using kill:

# kill -2 <pid>