Table of Contentsatmsigd - ATM signaling demon atmsigd [-b] [-c config_file] [-d] [-D dump_dir] [-l logfile] [-n] [-N] [-q qos] [-t trace_length] 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.
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 initializing.
- -c config_file
- Use the specified configuration file instead of /etc/atmsigd.conf
- -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 tracing is not yet enabled, the trace size is automatically set to a (small) default value.
- -l logfile
- Write diagnostic messages to the specified file instead of to standard error. The special name syslog is used to send diagnostics to the system logger.
- -n
- Prints addresses in numeric format only, i.e. no address to name translation is attempted.
- -N
- Makes atmsigd behave like the network side of the UNI (useful if you have two PCs but no switch). Normally, it acts as the user side.
- -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
- Enables tracing and sets the number of entries that should be kept in the trace buffer.
- /etc/atmsigd.conf
- 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
When receiving a SIGUSR1 signals, 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 LRC <werner.almesberger@lrc.di.epfl.ch> atmaddr(8), atmsigd.conf(4), ilmid.8.html" >ilmid(8), qos(7)
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