08-05-2004
Most systems will have both a cua* and a tty* device. The major number will be the same. The minor number will be a little different. One is for calling out. The other is for receiving a call.
When a program like getty tries to open the port, it must block and wait until the modem answers a call. After the modem established a link with the remote modem, it will raise DCD (data carrier detect). At this point the open system call will finally succeed and the getty will display a prompt. This will be using a tty* style special file.
But a program like tip or cu can't wait for DCD. The open must succeed immediately. Then the program will send atdt5551212 or whatever to the modem to start a call. These programs need to use a cua* style device.
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LEARN ABOUT SUSE
faxgetty
FAXGETTY(8C) FAXGETTY(8C)
NAME
faxgetty - HylaFAX front-door process
SYNOPSIS
/usr/lib/fax/faxgetty [ -D ] [ -p ] [ -q queue-dir ] device
DESCRIPTION
faxgetty is the HylaFAX server program that listens for incoming phone calls and either handles each call directly or hands it off to an
appropriate program. In addition faxgetty monitors modem usage and notifies the HylaFAX scheduler process when a modem's status changes;
e.g. when a modem is busy with an outbound call.
One faxgetty should be run for each facsimile modem on a machine. faxgetty is typically started by init(8C). faxgetty can also be used
with data-only modems; this may be desirable if some of the non-facsimile features are important, such as the support for screening calls
according to Caller-ID information.
faxgetty listens to its facsimile modem for incoming calls and to a FIFO special file on which it accepts command directives from adminis-
trative commands such as faxanswer(8C) and faxabort(8C). faxgetty also catches SIGTERM and SIGINT signals; cleaning up any necessary
resources before exiting.
Many aspects of faxgetty operation are controlled through a configuration file. In particular, for faxgetty to automatically invoke the
getty(8C) program to handle incoming data connections the GettyArgs parameter must be setup in the configuration file. The configuration
file is located in the spooler hierarchy in the etc subdirectory and is named config.devid, where devid is an identifier derived from the
name of the modem's device file; for example ttym2 for /dev/ttym2, term_10 for /dev/term/10. Consult hylafax-config(5F) for detailed
information on the contents of configuration files.
OPTIONS
-D This option forces faxgetty to detach itself from the controlling tty from which it was invoked. In normal operation faxgetty
will not disassociate itself from the controlling tty.
-p Do not change the process priority when receiving facsimile. Normally faxgetty will raise its priority to reduce i/o latency.
This option is useful for debugging.
-q dir The specified directory is treated as the spooling area. The default spooling area, /var/spool/fax, is defined at the time the
software is built.
FILES
/var/spool/fax/FIFO.device FIFO special file for submitting commands
/var/spool/fax/etc/config.device device-specific configuration file
Consult hylafax-server(5F) for a complete discussion of the structure and content of the spooling area.
SEE ALSO
faxabort(8C), faxlock(8C), faxanswer(8C), faxconfig(8C), faxstate(8C), faxq(8C), getty(8C), hylafax-server(5F), hylafax-config(5F)
July 31, 1995 FAXGETTY(8C)