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From: davis@pacific.mps.ohio-state.edu ("John E. Davis")
Newsgroups: comp.unix.programmer
Subject: BSD ioctl question
Message-ID: <DAVIS.91Apr9055635@pacific.mps.ohio-state.edu>
Date: 9 Apr 91 09:56:35 GMT
Sender: news@pacific.mps.ohio-state.edu
Reply-To: davis@pacific.mps.ohio-state.edu  (John E. Davis)
Distribution: comp
Organization: "Dept. of Physics, The Ohio State University"
Lines: 50

Hi,

  This is a BSD unix question.  I to read a character in RAW mode from, say,
file descriptor 2.  Raw turns off all input/output processing.  However, I
only want input processing turned off.  This is not the same as CBREAK.
CBREAK still does input processing on the special characters ^Z (stop),
^\ (quit), etc... which I want turned off.  So my question is this:  from
within a C program how do I accomplish the above objective?

Currently I have:
{          .
          .
          .

#define TTY_DESCR 2
extern int ioctl(int, int, ...);

#include <sgtty.h>
struct sgttyb   OLDTTY;

          .
          .

void init_io()
{          
    struct sgttyb newtty;

    ioctl(TTY_DESCR, TIOCGETP, &OLDTTY);
    newtty = OLDTTY;
    newtty.sg_flags |= CBREAK;  
    newtty.sg_flags &= ~(ECHO | XTABS);
    
    ioctl(TTY_DESCR, TIOCSETP, &newtty);
}

Here I use CBREAK mode but I want to allow all input characters to pass
through unprocessed and I want output processing.  What are the necessaary
changes?  Note: I did RTFM but all it talked about was termio which our system
does not have (although for some stupid reason the man pages think so).

A related question (perhaps the same question): It seems that from the shell,
I can type `stty -isig' to turn off input processing on the interrupt
characters (^Z, etc..).  In BSD, how do I accomplish this with an ioctl?

Thanks,      
--
John

  bitnet: davis@ohstpy
internet: davis@pacific.mps.ohio-state.edu