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Dos communication program on SCO

Dos communication program on SCO

Post by Hoang Ph » Wed, 21 Jun 1995 04:00:00



Hi,
I am having a bit of trouble to run a DOS Comn. program on SCO R3.2V4.2, would
anyone can give me some suggestion on this problem please. Thanks in advance.

The problem is as following:
When I run this DOS Comn. program, I enter on unix prompt as:
        dos +acom1 switch
(indirect control on com1).this program will run and communicate with com1,
this is fine, but the overall performance of the system is VERY slow if I run
different programs, even unix program or dos program. Then I tried to run
direct control on com1 by:
        dos +dcom1 switch
the program is not running, it is stopping immediately.

Are there any parameter (e.g. kernel parameter, etc.) that I can tune to let
this program run indirect control on com1 with minimum disruption to the
performance of the system?. Or if I run this program in "direct control on
com1" mode, how would I run it?.

I also tried to run on com2 as well, but still the same result.
I don't really want to rewrite this dos program.
Please help, thanks.
If possible, please mail to me on this address

HOANG.

 
 
 
Top

1. Problem with program doing serial communication under Cygwin

Dear colleages,

I have written a command-line program that uses the serial port (TTYS0) for
communication with an embedded device.

I need to port this program to Windows, so I tried to compile it under the
Cygwin environment. I changed the name of the serial port from '/dev/TTYS0'
to 'COM1:'.

The program compiles well, but when I start it, it terminates with an error
on the function tcgetattr(), although it goes well over opening the serial
port (see listing below). I'm getting error #25 "Not a typewriter".

Does anybody know why this is happening and can provide a solution?

Thank you very much in advance
ar

  if( (fhSerial = open(szSerialFileN,O_RDONLY)) == -1 ){
    BailOut("Unable to open the serial port!\n");
  }
  if( val == S_SET ){
    if( tcgetattr(fhSerial,&OldSerialMode) != 0 ){
/*DEBUG*/     printf("'%s' %i",strerror(errno),errno);
      BailOut("Unable to read the serial port settings!\n");
    }

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