by I have never used this before so this should prove interesting.
I am trying to write a C program which opens a /dev/tty serial port.
I have no problems setting the baud rate, stop bits, parity etc using
ioctl(fileDescriptor, TCGETA, &ioctlStructure);
and
ioctl(fileDescriptor, TCSETA, &ioctlStructure);
The code is being tested on DEC/ULTRIX but will end up running under IBM/AIX.
However, I do have problems with the following.
------------------------
How do I tell if the other end has dropped its CD or DSR such that I
can have the program reset appropriately.
What commands do I need to have such that I support the modem lines fully
and correctly.
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I already use the following code :-
open(portName, O_RDRW | O_NDELAY | O_BLKINUSE | O_BLKANDSET | O_NSHARE)
ioctl(fileDescriptor, TCGETA, &ioctlStructure);
/* setup structure appropriately */
ioctl(fileDescriptor, TCSETA, &ioctlStructure);
ioctl(fileDescriptor, TIOCCAR, &aZero);
ioctl(fileDescriptor, TIOCHPCL);
ioctl(fileDescriptor, TIOCSDTR);
I then use read(), write() and select().
Code samples or a direction in which to go to find these samples would
be greatly appreciated.
This is actually being used to communicate with a PC running SYMBOL Technologies
Serial Access Bridge software, for those of you who are interested.
...Lyall Pearce