atmsigd - ATM signaling demon
atmsigd [-b] [-c config_file] [-d] [-D dump_dir] [-l logfile] [-m mode]
[-n] [-q qos] [-t trace_length] [-u uni_version] [[itf.]vpi.vci
atmsigd 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 network.
Note that atmsigd is not able to accept or establish connections until
the local ATM address of the interface is configured by ilmid or
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.
If atmsigd is killed, all system calls requiring interaction with it
will return with an error and set errno to EUNATCH.
-b Run in background (i.e. in a forked child process) after
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.
-d Enables (lots of) debugging output. By default, atmsigd is
Specifies the directory to which atmsigd will write status and
trace dumps. If -D is not specified, dumps are written to
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
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.
-n 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.
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.
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 renegotiation.
-V Prints the version number of atmsigd on standard output and
/etc/atmsigd.conf default configuration file
default location of status dumps
default location of signaling trace dumps
When receiving a SIGUSR1 signal, atmsigd 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
atmsigd.pid.status.number and atmsigd.pid.trace.number, respectively,
with number 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, atmsigd therefore forks a child process that runs in parallel to
the signaling demon.
Werner Almesberger, EPFL ICA <Werner.Almesberger@epfl.ch>
atmaddr(8), atmsigd.conf(4), ilmid(8), qos(7)