[NTLUG:Discuss] Help with serial I/O.

[Kipton Moravec]

Programming in Linux.

I have been programming a long time, but have programmed for DOS,
Vax/Vms, Windows 3.1, but never UNIX.

I have a very simple question.  How do I open a serial port, and read
and write binary information to it? 

What is the C command to open say COM3:  

Then does printf work?

The program is very simple to talk to an external device, and dump the
formatted results to a file, but I am not sure where to start.

Is there a good general book on programming Linux in C that would
explain this?

Also I want to poll this device every 120 Seconds.  Is there a sleep
command that lets my program become inactive for a while?  Or is it
better to have it rescheduled to execute two minutes later?

Kip