atmsigd - ATM signaling demon
] [-c config_file
] [-l logfile
] [-q qos
] [-u uni_version
implements the ATM UNI signaling protocol. Requests to establish,
accept, or close ATM SVCs are sent from the kernel (using a comparably simple
protocol) to the signaling demon, which then performs the dialog with the
Note that atmsigd
is not able to accept or establish connections until
the local ATM address of the interface is configured by ilmid
manually using atmaddr
The default signaling VC (interface 0, VPI 0, VCI 5) can be overridden on the
command line by specifying a different PVC address.
When overriding the default VC, optionally a pair of named pipes to use for
communicating with the user of signaling can be specified. Normally, the
kernel is the user of signaling and atmsigd
opens a special socket for
communication with it.
is killed, all system calls requiring interaction with it will
return with an error and set errno
- Run in background (i.e. in a forked child process) after
- -c config_file
- Use the specified configuration file instead of
/etc/atmsigd.conf If an option is specified in the configuration
file and on the command line, the command line has priority.
- Enables (lots of) debugging output. By default,
atmsigd is comparably quiet.
- -D dump_dir
- Specifies the directory to which atmsigd will write
status and trace dumps. If -D is not specified, dumps are written
- -l logfile
- Write diagnostic messages to the specified file. The
special name syslog is used to send diagnostics to the system
logger, stderr is used to send diagnostics to standard error. If
-l is absent, the setting in atmsigd.conf is used. If
atmsigd doesn't specify a destination either, messages are written
to standard error.
- -m mode
- Set the mode of operation. The following modes are
available: user for the user side (the default), network for
the network side (useful if you have two PCs but no switch), and
switch for operation with a signaling relay in a switch.
- Prints addresses in numeric format only, i.e. no address to
name translation is attempted.
- -q qos
- Configures the signaling VC to use the specified quality of
service (see qos(7) for the syntax). By default, UBR at link speed is used
on the signaling VC.
- -t trace_length
- Sets the number of entries that should be kept in the trace
buffer. -t 0 disables tracing. If -t is not specified,
atmsigd uses a default of 20 trace entries.
- -u uni_version
- Sets the signaling mode. The following modes are supported:
uni30 for UNI 3.0, uni31 for UNI 3.1, uni31+uni30 for
UNI 3.1 with 3.0 compatibility, uni40 for UNI 4.0, and
uni40+q.2963.1 for UNI 4.0 with Q.2963.1 peak cell rate
- Prints the version number of atmsigd on standard
output and exits.
- default configuration file
- default location of status dumps
- default location of signaling trace dumps
When receiving a SIGUSR1
dumps the list of all
internal socket descriptors. With SIGUSR2
, it dumps the contents of the
trace buffer. If a dump directory was set, dumps are written to files called
, respectively, with
starting at zero and being incremented for every dump. If no
dump directory is set, dumps are written to standard error.
Dumps are also generated whenever atmsigd
detects a fatal error and
terminates. No attempt is made to catch signals like SIGSEGV
The generation of traces is a comparably slow process which may already take
several seconds for only 100 trace entries. To generate a trace dump,
therefore forks a child process that runs in parallel to the
Werner Almesberger, EPFL ICA <Werner.Almesberger@epfl.ch>
atmaddr(8), atmsigd.conf(4), ilmid(8), qos(7)