C++ (Cpp) splconsmedia Examples

Example #1

File: cfl.c Project: yazshel/netbsd-kernel

/*ARGSUSED*/
int
cflrw(dev_t dev, struct uio *uio, int flag)
{
	struct buf *bp;
	int i;
	int s;
	int error;

	if (uio->uio_resid == 0) 
		return (0);
	s = splconsmedia();
	while (cfltab.cfl_state == BUSY)
		(void) tsleep(&cfltab, PRIBIO, "cflbusy", 0);
	cfltab.cfl_state = BUSY;
	splx(s);

	bp = cfltab.cfl_buf;
	error = 0;
	while ((i = imin(CFL_BYTESPERSEC, uio->uio_resid)) > 0) {
		bp->b_blkno = uio->uio_offset>>7;
		if (bp->b_blkno >= CFL_MAXSEC ||
		    (uio->uio_offset & 0x7F) != 0) {
			error = EIO;
			break;
		}
		if (uio->uio_rw == UIO_WRITE) {
			error = uiomove(bp->b_data, i, uio);
			if (error)
				break;
		}
		if (uio->uio_rw == UIO_WRITE) {
			bp->b_oflags &= ~(BO_DONE);
			bp->b_flags &= ~(B_READ);
			bp->b_flags |= B_WRITE;
		} else {
			bp->b_oflags &= ~(BO_DONE);
			bp->b_flags &= ~(B_WRITE);
			bp->b_flags |= B_READ;
		}
		s = splconsmedia(); 
		cflstart();
		biowait(bp);
		splx(s);
		if (bp->b_error != 0) {
			error = bp->b_error;
			break;
		}
		if (uio->uio_rw == UIO_READ) {
			error = uiomove(bp->b_data, i, uio);
			if (error)
				break;
		}
	}
	cfltab.cfl_state = OPEN;
	wakeup((void *)&cfltab);
	return (error);
}

Example #2

File: crl.c Project: ryo/netbsd-src

/*ARGSUSED*/
int
crlrw(dev_t dev, struct uio *uio, int flag)
{
	struct buf *bp;
	int i;
	int s;
	int error;

	if (uio->uio_resid == 0) 
		return (0);
	s = splconsmedia();
	while (crltab.crl_state & CRL_BUSY)
		(void) tsleep(&crltab, PRIBIO, "crlbusy", 0);
	crltab.crl_state |= CRL_BUSY;
	splx(s);

	bp = crltab.crl_buf;
	error = 0;
	while ((i = imin(CRLBYSEC, uio->uio_resid)) > 0) {
		bp->b_blkno = uio->uio_offset>>9;
		if (bp->b_blkno >= MAXSEC || (uio->uio_offset & 0x1FF) != 0) {
			error = EIO;
			break;
		}
		if (uio->uio_rw == UIO_WRITE) {
			error = uiomove(bp->b_data, i, uio);
			if (error)
				break;
		}
		if (uio->uio_rw == UIO_WRITE) {
			bp->b_oflags &= ~(BO_DONE);
			bp->b_flags &= ~(B_READ);
			bp->b_flags |= B_WRITE;
		} else {
			bp->b_oflags &= ~(BO_DONE);
			bp->b_flags &= ~(B_WRITE);
			bp->b_flags |= B_READ;
		}
		s = splconsmedia();
		crlstart();
                while ((bp->b_oflags & BO_DONE) == 0)
                  (void) tsleep(bp, PRIBIO, "crlxfer", 0);
		splx(s);
		if (bp->b_error != 0) {
			error = bp->b_error;
			break;
		}
		if (uio->uio_rw == UIO_READ) {
			error = uiomove(bp->b_data, i, uio);
			if (error)
				break;
		}
	}
	crltab.crl_state &= ~CRL_BUSY;
	wakeup((void *)&crltab);
	return (error);
}