UNIX for Dummies Questions & Answers

While transmitting RS232 data I use tcdrain() to wait for the data to be sent before putting more data into the txbuffer.

Code:

write(hPort, txBytes, txBytes.count);
tcdrain();

If the remote device disconnects then tcdrain never returns.

I'm doing it in a thread so the UI is still responsive but I just can't figure out a way to tell tcdrain to stop waiting.

If I was doing it in MS Windows it's simply a case of calling a function to flush buffers which causes the drain to complete and return naturally.

In Posix though any attempt to call flush while tcdrain is stuck also causes flush() to hang as well.

I've googled everywhere and a few people have asked this question in various forums but I've never seen an answer.

Thank you for any suggestions

Can you not call pthread_kill on the "tcdrain thread"?