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       cyclades-ser-cli Serial Port Interface for Cyclades Terminal Servers


       cyclades-ser-cli [options] devname rasname physport


       The cyclades-ser-cli program connects a Unix device file ’devname’ to a
       physical port ’physport’  of  a  Cyclades  Terminal  Server  ’rasname’.
       cyclades-ser-cli provides the I/O interface between the device file and
       the physical port, running as an ’user-mode device driver’.

       If ’physport’ is assigned to 0,  then  ’rasname’  is  used  as  the  IP
       address on an IP-based serial port addressing.


       cyclades-ser-cli may be started with the following options:

       -u ptyiosize
              Sets  the  internal  device  I/O size to ptyiosize (maximum 4096
              bytes, default 1024 bytes)

       -n netiosize
              Sets the internal socket I/O  size  to  netiosize  (maximum  512
              bytes, default 128 bytes)

       -i retrydelay
              Delay in seconds between connection requests (default: 60)

       -r retries
              Number  of  connection request retries before exiting. (default:

       -s     Use the Socket Server protocol for talking to the  server,  this
              means  just  piping  all  the data down a TCP connection with no
              control information, so it’s impossible to change the port speed
              etc.  The default is to use the RFC2217 protocol.

       -m modem handling
              The  default  is  0  which  means to check DCD state, 1 means to
              ignore DCD.

       -c close mode
              Last close handling; the default is 0 which means to hangup  the
              modem, 1 means not to hangup.

       -p start port
              TCP  base  port  of  servers  at terminal server side (defaults:
              31000 for Socket server, 30000 for Remote Telnet Server).  Note:
              if  ’physport’  is  assigned to zero, this option has no effect,
              the Telnet Server standard port (23) is used.

       -d debug level
              The default is debug level 0 (little debugging), level 1  debugs
              internal  state  changes,  level  2  debugs  events, and level 3
              debugs IO calls.

       -f     Run in foreground, this is suitable for running from init.

       -x     Console mode: normally all messages are sent to  syslogd  (using
              local2 facility). With this option, all messages will be sent to
              stdout  and  cyclades-ser-cli  runs  in  the  foreground.   This
              implies -f


       Every  instance  of  cyclades-ser-cli will have a virtual serial device
       which is a sym-link to a pseudo-tty.  A terminal program can then  talk
       to the virtual serial device and it’s data transfers will be redirected
       across the network.  Each virtual serial device will be accompanied  by
       a  Unix  domain  socket  with  the  same  name  with  the  addition  of
       ".control".  So if cyclades-ser-cli provides the virtual  device  named
       "/dev/modem"    then    it   will   have   a   control   socket   named
       "/dev/modem.control".  There is a shared object named  libcyclades-ser-  which  intercepts  calls  to the tcsetattr() and tcsendbreak().
       This shared object then sends the relevant data to the cyclades-ser-cli
       server  via the control socket.  To recognise a virtual modem device it
       has to read /etc/cyclades-devices.

       The shared object can be loaded  per-application
       through  the  LD_PRELOAD environment variable, or for the entire system
       through  the  system  shared   object   configuration   (see   the   OS
       documentation).   Note  that the LD_PRELOAD environment variable has to
       have the fully qualified path of the object, otherwise  an  application
       which changes it’s current directory may fail.


       In  Solaris does not work with the stty program.
       stty uses a different interface to this and requires some extra coding.

       In  Solaris conflicts with some system programs
       such as ps for unknown reasons.  Just don’t load it for those programs,
       it has no such problems with any serial comms programs.


       Start an interface between /dev/prt1 device and a serial port number 10
       of a Terminal Server named pr01, without hangup at last close:

       cyclades-ser-cli -c 1 /dev/prt1 pr01 10

       In general use do not start cyclades-ser-cli  from  the  command  line,
       start it through the cyclades-serial-client script or from init.


       cyclades-serial-client(1), cyclades-devices(5)