usr/src/cmd/reset.c

/*
 * reset - set the teletype mode bits to be sensible
 *
 * Kurt Shoens
 *
 * Very useful after crapping out in raw.
 * Modified by Mark Horton to know about tchars
 * and to not mess with peoples chars unless they are null.
 */
#include <sgtty.h>
#define chk(val, dft) (val==0 ? dft : val)

main()
{
        struct sgttyb buf;
        struct tchars tbuf;

        gtty(2, &buf);
        ioctl(2, TIOCGETC, &tbuf);
        buf.sg_flags &= ~(RAW|CBREAK|VTDELAY|ALLDELAY);
        buf.sg_flags |= XTABS|ECHO|CRMOD|ANYP;
        buf.sg_erase = chk(buf.sg_erase, '\08');        /* ^H */
        buf.sg_kill = chk(buf.sg_kill, '\30');          /* ^X */
        tbuf.t_intrc = chk(tbuf.t_intrc, '\177');       /* ^? */
        tbuf.t_quitc = chk(tbuf.t_quitc, '\34');        /* ^\ */
        tbuf.t_startc = chk(tbuf.t_startc, '\22');      /* ^Q */
        tbuf.t_stopc = chk(tbuf.t_stopc, '\24');        /* ^S */
        tbuf.t_eofc = chk(tbuf.t_eofc, '\4');           /* ^D */
        /* brkc is left alone */
        ioctl(2, TIOCSETN, &buf);
        ioctl(2, TIOCSETC, &tbuf);
}