This page applies to the development version of xrdp.

The socketdir contains file sockets used to link user session components together.

At compile time, the directive --with-socketdir= can be used to set the socketdir to a suitable location for the system.

The directory is owned by root:root with permissions of 755.

The xrdp-sesman daemon manages all top-level contents of the directory.

At the time of writing, the following entities can be found in this directory.

The symbol $UID means a numeric user-ID and the symbol $SockdirGroup is the setting of SessionSockdirGroup within sesman.ini.

The recovery directory contains sockets created by sesexec processes which allow a restarted sesman to discover existing user sessions.

The setgid bit is set on the per-user directories. This allows the sockets created within these directories to have a group ownership of $SockdirGroup rather than the primary group of the user - see #3011 for details.

For this version of xrdp, $SockdirGroup is normally set to root. xrdp acquires access to per-user session sockets by asking sesman to connect to the sockets on its behalf.

Where sesman is not used to manage sessions, the value of $SockdirGroup can be set to the runtime group of the xrdp process. This allows the xrdp process to access these directories directly.

Within each of the per-user directories, the following socket files can be found.

Sockets are owned by $uid:$SockdirGroup with a permissions mask of 660.

An up-to-date list can be found in the source file common/xrdp_sockets.h.

Socket used for communicating with chansrv by libxrdpapi applications (e.g. vrplayer)

This socket is connected to by the XRDP process (xrdp(8)). It carries virtual channel data between XRDP and chansrv.

This socket is only present in the file system while chansrv is awaiting a connection from xrdp(8). The listening socket is removed when xrdp(8) connects to prevent concurrent connections to chansrv. It is re-created when the connection to xrdp(8) is closed.

These sockets are connected to by the pulseaudio server in the user's session. See the pulseaudio-module-xrdp wiki for more information on this facility.

This socket is only present for Xorg-based sessions. This socket is connected to by the XRDP process. It carries RDP data between XRDP and the X server.

This socket is only present for Xorg-based sessions. This socket can be used to disconnect a session. It is used by xrdp-dis(1).