NAME
auserver - Network Audio System server
SYNOPSIS
au [:listen port offset] [-option ...]
DESCRIPTION
au is the generic name for the Network Audio System server. It is frequently a link or a copy of the appropriate server binary for driving the most frequently used server on a given machine.
STARTING THE SERVER
The server is usually started from /etc/rc or a user's startup script.
When the Network Audio System server starts up, it takes over /dev/audio. Note that applications that attempt to access /dev/audio themselves will fail while it is running.
NETWORK CONNECTIONS
The Network Audio System server supports connections made using the following reliable byte-streams:
- TCPIP
-
The server listens on port 8000+n, where n is the listen port offset.
- Unix Domain
-
The X server uses /tmp/.sockets/audion as the filename for the socket, where n is the display number.
OPTIONS
All of the Network Audio System servers accept the following command line options:
- -aa
-
Allows clients on any host to connect. By default, access is allowed only to clients on the local host.
SIGNALS
The Network Audio System server attaches special meaning to the following signals:
- SIGHUP
-
This signal causes the server to close all existing connections, free all resources, and restore all defaults.
- SIGTERM
-
This signal causes the server to exit cleanly.
- SIGUSR1
-
This signal is used quite differently from either of the above. When the server starts, it checks to see if it has inherited SIGUSR1 as SIG_IGN instead of the usual SIG_DFL. In this case, the server sends a SIGUSR1 to its parent process after it has set up the various connection schemes.
DIAGNOSTICS
Too numerous to list them all. If run from init(8), errors are typically logged in the file /usr/adm/audio*msgs,
FILES
- /tmp/.sockets/audio*
-
Unix domain socket
- /usr/adm/audio*msgs
- /dev/audio
-
Audio device
SEE ALSO
nas(1), auinfo(1), auplay(1), auctl(1)
BUGS
If au dies before its clients, new clients won't be able to connect until all existing connections have their TCP TIME_WAIT timers expire.
The current access control support is weak at best.
COPYRIGHT
Copyright 1993, Network Computing Devices, Inc.
AUTHORS
The Network Audio System server was written by Greg Renda and Dave Lemke, with large amounts of code borrowed from the sample X server.
The sample X server was originally written by Susan Angebranndt, Raymond Drewry, Philip Karlton, and Todd Newman, from Digital Equipment Corporation, with support from a large cast. It has since been extensively rewritten by Keith Packard and Bob Scheifler, from MIT.