[ale]Using write() and blocking

[cfowler at outpostsentinel.com (Chris Fowler)]

I have a piece of code that opens a tty in nonblocking mode.  It them applies
tty seetings and using fcntl() to place that tty into blocking mode.  After that line of 
code I immediately do the following:

printf("Press enter to continue...");
fflush(stdout);
fgets(buffer, 2, stdin);

I expect the write() to block until the DCD on the serial port goes high.  But the
write() takes place.  It appears that  the fgets or read() will block.  Is this correct or
am I doing something wrong?

Goal:
1.  Open tty and apply settings like modem control.
2..  Wait for phone call (DCD).
3.   Give user menu of numbers to dial back on
4.   drop DTR
5.   Call user back
6.   exec login on tty
7.   restart when finished.



Thanks,
Chris



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