Simple Interprocess Communication Bus

Introduction

The xbus is a simple interprocess communication bus based on publish/subscribe messaging over a UNIX domain socket that was designed for use in embedded devices with limited memory.

It consists of a daemon that acts as a message broker, a tiny library that provides basic functions for communication and a command line tool that is useful for debugging as well as for writing shell scripts.

Examples

Publisher

#include "xbus.h"

int main(void)
{
  xbus_publish("sms/incoming", "Hello, World!");

  return 0;
}

Subscriber

#include <stdio.h>
#include "xbus.h"

int main(void)
{
  char *topic, *payload;

  xbus_subscribe("sms/*");

  while (1) {
    payload = xbus_receive(&topic);
    printf("[%s]\n%s\n\n", topic, payload);
  }
}

Prerequisites

• GNU Make 3.81+
• GCC 4.9+

Build instructions

Execute the following command:

make [DEBUG=1] [ASAN=1] [UBSAN=1] [V=1]

Install instructions

Execute the following command:

make install [DESTDIR=<dir>]

Directory structure

xbus
 |
 |--OBJ.*                     Output directories with built files
 |
 |--library                   IPC bus library (client API)
 |
 |--server                    IPC bus server (message broker)
 |
 |--tool                      IPC bus command line tool
 |
 |--LICENSE                   BSD 3-clause license
 |--Makefile                  Main Makefile
 |--NEWS.md                   Version history
 |--README.md                 This file
 |--Rules.mk                  Build rules
 +--Setup.mk                  Build setup

License

The code is available under the BSD 3-clause license. See the LICENSE file for the full license text.