Serialmon-0.24 released 18-Mar-2001. Added bandwidth management function to allow scripted use of the serial line to wait for slack in traffic. The new version also includes a kernel module which allows the use of serialmon without having to patch the kernel. Note this bandwidth management function is a superior implementation of the scheme used in the BW script.

patch file for serial.c in ltmodem-5.78d.tar.gz. Note that it is assumed you have already patched the kernel.

New kernel patch file for 2.0.37 kernels.

Added link to ksermon.

Serialmon-0.23 released 27-Nov-98. Support for all latest (i386) kernels now ok again, also supports glibc2.

I have a script to regulate traffic on a PPP link, which may be of interest if you download stuff automatically.

MD5 checksums of various web pages are available.

A program to monitor a modem on a serial port, and simulate the modem LEDS on a colour console using curses, also bandwidth management function and kernel module. See the lsm.

Information monitored:

• Modem lines: RI DCD RXD TXD DTR

Then, for each connection:

• Date and time: Line up, Line down
• Duration of call
• Amount of idle time on transmit and receive side
• Number of characters transmitted and received
• Data rate for the last second, transmit and receive
• Peak data rate over 1s and 10s, transmit and receive
• Overall average data rate, transmit and receive
• Process id and command line of the process using the line

The logfile contains all the above, but also includes additional information:

• Active time (time slices in which characters were transferred)
• Average data rate excluding idle time
• The time that the modem control lines (DCD and DTR) switch.
• The times that ioctls return I/O errors, and thus the line is reopened.
• Date and time that logging starts and finishes.

The bandwidth management function added in version 0.24 allows:

• A program may wait until the traffic reduces below a threshold before continuing (use waitforbw).
• Each program waiting is put into a queue, and they are then signalled in order each time the traffic drops.
• The traffic threshold may be set, and the minimum interval between allowing programs to continue (use sermonstats).
• A scrip can easily test if the line is up or down, and how many characters have been transferred (use sermonstats).

Download the Latest Version

The latest version is 0.24, released 18-Mar-2001. Note that it may take a few days to reach the ftp sites.

As serialmon requires (and includes) a small kernel patch, it is only released in source form.

Serialmon MD5 checksums of all the files are available, should you want to check against modification or corruption.

Sources and documentation - serialmon-0.24.tar.gz

ftp.demon.co.uk           ftp site.
www.roestock.demon.co.uk  web site.

LSM entry - serialmon-0.24.lsm

ftp.demon.co.uk           ftp site.
www.roestock.demon.co.uk  web site.

On-line documentation

The following on-line documentation is available:

• CHANGES for the complete list of changes.
• The README as included with the sources.

See also

ksermon - a similar program but with a graphical interface for running under X/KDE.