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cmx(8) System Manager's Manual cmx(8) NAME cmx - Generic communication exerciser SYNOPSIS /usr/field/cmx [ -h ] [ o file ] [ -t n ] -l line-n ... FLAGS Prints help message about command. Saves output diagnostics in file. Specifies the run time in minutes (n). The default is to run until a 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 flag must be set to on. The exerciser runs until a 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 speci- fied 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 be- cause 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 background until interrupted by a or a kill -15 pid: % /usr/field/cmx -l 11 42 45 76 & RELATED INFORMATION Commands: memx(8), fsx(8), shmx(8), tapex(8), diskx(8) delim off cmx(8)