Date: Sun, 11 Feb 2001 17:06:30 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender: eliz AT is
To: Dietmar Segbert <Dietmar DOT Segbert AT T-ONLINE DOT de>
cc: djgpp AT delorie DOT com
Subject: Re: termios.h and DOS
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On 11 Feb 2001, Dietmar Segbert wrote:

> i have some questions to termios.h.
> 
> In a program, i will compile, i found some variables called IUCLC, XCASE, 
> IXANY, B57600, B115200.
> In the headerfile of termios.h i did noht find some 
> definitions.

That's because they are not supported by DJGPP.

> int qm100_open(const char *devname)
> {
>   int serialdev;
>   qm100_packet_block packet;
>   char cmd[]=QM100_INIT;
> 
> 
>   serialdev = open(devname, O_RDWR | O_NOCTTY);
>   if (serialdev <= 0) 
>      {
>      char tmsg[100];
>      sprintf(tmsg, "Unable to open serial device %s", devname);
>      qm100_error(serialdev, tmsg, errno);
>      }
>   
> /* This does nicht do */
>   if (tcgetattr(serialdev, &oldt) < 0) 
>      qm100_error(serialdev, "Unable to get serial device attributes", errno);
> 
>   memcpy((char *)&newt,(char *)&oldt, sizeof(struct termios));
>   newt.c_cflag |= CS8 | HUPCL;
>   newt.c_iflag &= ~(IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|INLCR);
> /* next line ist original, second line from me */
> /*  newt.c_iflag &= ~(IGNCR|ICRNL|IXON|IXOFF|IXANY|IMAXBEL); */
>   newt.c_iflag &= ~(IGNCR|ICRNL|IXON|IXOFF|IMAXBEL);
>   
>   newt.c_oflag &= ~(OPOST);
>   newt.c_lflag &= ~(ISIG|ICANON);
>   newt.c_cc[VMIN] = 1;
>   newt.c_cc[VTIME] = 0;
> 
>   cfsetospeed(&newt, B9600);
>   cfsetispeed(&newt, B9600);
> 
>   if (tcsetattr(serialdev, TCSANOW, &newt) < 0)
>      qm100_error(serialdev, "Unable to set serial device attributes", errno);
>   qm100_transmit(serialdev, cmd, sizeof(cmd), &packet, "Open");
>   qm100_setSpeed(serialdev, qm100_transmitSpeed);
>   return serialdev;
> }
> 
> 
> Does it give a termios.h / termios.c source, who includes the above 
> describet functions IXANY, IUCLC and so on?

Unfortunately, your problem is much deeper than the lack of some manifest 
constants in termios.h.  The program you are trying to compile wants to 
program the serial device via the termios interface.  This doesn't work 
at all with DJGPP's emulation of termios, because the DJGPP emulation 
supports only the DOS terminal device.  It does not support the serial 
communications device at all.

If you want to compile this program with DJGPP, you will have to add the 
necessary functionality for that yourself.  It shouldn't be too hard to 
do that: you need a good async communications library (the SimTel.NET 
site has a couple of such libraries suitable for use with DJGPP), and you 
should use the Filesystem Extensions feature provided by DJGPP to 
reedirect normal file I/O to the async library.  Once you have this in 
place, implementing the missing termios functionality is easy.