I am using the gumstix to read data from the serial port, and logging the data to a file on the mmc card. The datalogging program starts at boot time. There is no console , and therefore no way to gracefully close the files and exit the program. I see only two ways to stop the program: remove power or remove the mmc card.
 
Doing either messes up the file. If I kill the process then the file is fine, but I can't do that without the console. I'm content to lose the last part of the file, but removing power messes up the whole file.
 
Is there some simple way to deal with this problem?
 
Warren