Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Thu, 15 Nov 2007 10:37:53 -0700

Hi Ron,

> Does a simple little program exist in C to read the iocLogServer
> circular file as messages are written to it?  I'm just wanting to see
> the circular file messages from the program on the screen (stdout).

I'm not aware that any program like that exists.

Perhaps a superior approach would be to modify the log server so that it
sends the log messages by default to stdout if the EPICS_IOC_LOG_FILE_NAME
environment variable isn't defined (or is empty). I suppose also that the
logic in the log server implementing a circular file would need to be
selectively disabled if the file descriptor being written to isn't a file
(we could easily test the file descriptor to see if it is a file or not).

There are probably already some UNIX command line tools that pipe their
input to a length constrained circular file? And of course the command line
tool tee can be used to break out to multiple destinations.

Jeff

> -----Original Message-----
> From: MacKenzie, Ronald R. [mailto:[email protected]]
> Sent: Wednesday, November 14, 2007 11:25 AM
> To: Jeff Hill
> Subject: iocLogServer simple browser
> 
> Hi Jeff,
> 
> Does a simple little program exist in C to read the iocLogServer
> circular file as messages are written to it?  I'm just wanting to see
> the circular file messages from the program on the screen (stdout).
> 
> Thanks,
> Ron
> 
> --
> 650-926-2490
> http://www.slac.stanford.edu/~ronm/

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System