ttycontrol.c File Reference

#include <xinu.h>

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Functions
devcall	ttycontrol (struct dentry *devptr, int32 func, int32 arg1, int32 arg2)

Function Documentation

ttycontrol()

devcall ttycontrol	(	struct dentry *	devptr,
		int32	func,
		int32	arg1,
		int32	arg2
	)

Definition at line 9 of file ttycontrol.c.

References dentry::dvminor, FALSE, OK, semcount(), signal(), SYSERR, TC_ECHO, TC_ICHARS, TC_MODEC, TC_MODEK, TC_MODER, TC_NEXTC, TC_NOECHO, TRUE, ttytab, TY_IMCBREAK, TY_IMCOOKED, TY_IMRAW, ttycblk::tyiecho, ttycblk::tyimode, ttycblk::tyisem, ttycblk::tyitail, and wait().

{
    struct  ttycblk *typtr;     /* Pointer to tty control block */
    char    ch;         /* Character for lookahead  */

    typtr = &ttytab[devptr->dvminor];

    /* Process the request */

    switch ( func ) {

    case TC_NEXTC:
        wait(typtr->tyisem);
        ch = *typtr->tyitail;
        signal(typtr->tyisem);
        return (devcall)ch;

    case TC_MODER:
        typtr->tyimode = TY_IMRAW;
        return (devcall)OK;

    case TC_MODEC:
        typtr->tyimode = TY_IMCOOKED;
        return (devcall)OK;

    case TC_MODEK:
        typtr->tyimode = TY_IMCBREAK;
        return (devcall)OK;

    case TC_ICHARS:
        return(semcount(typtr->tyisem));

    case TC_ECHO:
        typtr->tyiecho = TRUE;
        return (devcall)OK;

    case TC_NOECHO:
        typtr->tyiecho = FALSE;
        return (devcall)OK;

    default:
        return (devcall)SYSERR;
    }
}

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