#### Linux From Scratch - Version 12.3-systemd

### Chapter 8. Installing Basic System Software

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# 8.77. D-Bus-1.16.0

D-Bus is a message bus system, a simple way for applications to talk to one another. D-Bus supplies both a system daemon (for events such as "new hardware device added" or "printer queue changed") and a per-user-login-session daemon (for general IPC needs among user applications). Also, the message bus is built on top of a general one-to-one message passing framework, which can be used by any two applications to communicate directly (without going through the message bus daemon).

Approximate build time: 0.1 SBU
Required disk space: 17 MB

## 8.77.1. Installation of D-Bus

Prepare D-Bus for compilation:

    mkdir build
    cd    build

    meson setup --prefix=/usr --buildtype=release --wrap-mode=nofallback ..

The meaning of the meson options:

`--wrap-mode=nofallback`

  This switch prevents meson from attempting to download a copy of the Glib package for the tests.

Compile the package:

    ninja

To test the results, issue:

    ninja test

Many tests are disabled because they require additional packages that are not included in LFS. Instructions for running the comprehensive test suite can be found in the BLFS book.

Install the package:

    ninja install

Create a symlink so that D-Bus and systemd can use the same `machine-id` file:

    ln -sfv /etc/machine-id /var/lib/dbus

## 8.77.2. Contents of D-Bus

Installed programs: dbus-cleanup-sockets, dbus-daemon, dbus-launch, dbus-monitor, dbus-run-session, dbus-send, dbus-test-tool, dbus-update-activation-environment, and dbus-uuidgen
Installed libraries: libdbus-1.so
Installed directories: /etc/dbus-1, /usr/include/dbus-1.0, /usr/lib/dbus-1.0, /usr/share/dbus-1, /usr/share/doc/dbus-1.16.0, and /var/lib/dbus

### Short Descriptions

dbus-cleanup-sockets | is used to remove leftover sockets in a directory
dbus-daemon | is the D-Bus message bus daemon
dbus-launch | starts dbus-daemon from a shell script
dbus-monitor | monitors messages passing through a D-Bus message bus
dbus-run-session | starts a session bus instance of dbus-daemon from a shell script and starts a specified program in that session
dbus-send | sends a message to a D-Bus message bus
dbus-test-tool | is a tool to help packages test D-Bus
dbus-update-activation-environment | updates environment variables that will be set for D-Bus session services
dbus-uuidgen | Generates a universally unique ID
`libdbus-1` | Contains API functions used to communicate with the D-Bus message bus

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