NAME¶
atmsigd - ATM signaling demon
SYNOPSIS¶
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
[
input output]
]
atmsigd -V
DESCRIPTION¶
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.
OPTIONS¶
- -b
- Run in background (i.e. in a forked child process) after
initializing.
- -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.
- -d
- 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 to
/var/tmp.
- -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.
- -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.
- -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 renegotiation.
- -V
- Prints the version number of atmsigd on standard output and
exits.
FILES¶
- /etc/atmsigd.conf
- default configuration file
- /var/tmp/atmsigd.pid.status.version
- default location of status dumps
- /var/tmp/atmsigd.pid.trace.version
- default location of signaling trace dumps
DEBUGGING¶
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.
BUGS¶
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.
AUTHOR¶
Werner Almesberger, EPFL ICA <Werner.Almesberger@epfl.ch>
SEE ALSO¶
atmaddr(8),
atmsigd.conf(4),
ilmid(8),
qos(7)