leone@ohsu.edu (T J Leone) (02/07/91)
I'm trying to write a program that transfers data between a Unix and a non-Unix machine. The program should be a portable as possible between SV and BSD Unix. I've looked at the code for XMODEM (3.9?), and it looks like data is transferred over the tty used by the terminal emulator. Since I won't be using terminal emulation, I have to access a tty port directly. It's a full duplex serial line, directly connected to the non-Unix machine. I've been able to send data through the port by doing an open on the tty, but that only gives me one file descriptor. The problem his, how do I make sure that I'm not trying to read in data that I've just written out? XMODEM seems to have two different "bands" to work with (stdin and stdout), but I just have the one port. Thanks in advance, --tj