cmx(8)cmx(8)NAMEcmx - Generic communication exerciser
SYNOPSIS
/usr/field/cmx [-b [minbaud]-[maxbaud]] [-h] [-ofile] [-tn] -l line-
n...
OPTIONS
Use this option to specify the minimum, maximum, or range of baud rates
to test. Prints help messages about the cmx command. Test all the
listed tty lines, where n equals the lines to test according to the
special device file entries in the /dev directory, such as 00, 12, or
42-53 Saves output diagnostics in file. Specifies the run time in min‐
utes (n). The default is to run until a [CTRL-C] or a kill -15 pid is
sent to the process.
DESCRIPTION
The cmx exerciser writes, reads, and validates random data and packet
lengths on a specified communications line. The line being tested must
have a loopback connector attached to the distribution panel, or the
cable and the line must be disabled in the /etc/inittab file and a non-
modem line; the CLOCAL option must be set to on.
The exerciser runs until a [CTRL-C] or a kill -15 pid is sent to the
process.
A logfile for you to examine and then remove is created in the current
working directory; errors can be listed in the logfile.
You must specify the -l option followed by the lines to test. The line-
n arguments identify the lines to be tested. A maximum of 32 lines can
be tested at any one time. The line-n arguments are specified as names
taken from the /dev directory without the letters “tty.” For example,
if the /dev directory lists tty03, the line-n argument is 03.
The Devices section lists the devices that can be tested.
RESTRICTIONS
If you want to run a system exerciser over an NFS link or on a diskless
system, there are some restrictions. For exercisers such as fsx(8)
that need to write into a file system, the target file system must be
writable by root. Also, the directory from which an exerciser is exe‐
cuted must be writable by root because temporary files are written into
the directory. These restrictions can be difficult to adhere to
because NFS file systems are often mounted in a way that prevents root
from writing into them. Some of the restrictions may be adhered to by
copying the exerciser into another directory and then executing it.
Pseudo devices (devices whose first character after tty is any alpha‐
betic character, other than lowercase d) cannot be tested. Also lat
devices with major #5 cannot be tested.
DEVICES
Use the file command on /dev/tty* to find out which tty line corre‐
sponds to a device line number.
EXAMPLES
The following example runs the cmx exerciser for 60 minutes on lines
00, 13, 22, and 32: % /usr/field/cmx -t60 -l 00 13 22 32 The following
example runs the cmx exerciser on lines 11, 42, 45, and 76 in the back‐
ground until interrupted by a [CTRL-C] or a kill -15 pid: %
/usr/field/cmx -l 11 42 45 76 & The following example runs the cmx
exerciser on line 11, specifying a range of baud rates to test. %
/usr/field/cmx -b9600-38400 -l 11
SEE ALSO
Commands: diskx(8), fsx(8), memx(8), shmx(8), tapex(8)cmx(8)