Source to stand/dev.c
/*
* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)dev.c 7.14 (Berkeley) 5/5/91
*/
#include <sys/param.h>
#include <setjmp.h>
#include "saio.h"
/*
* NB: the value "io->i_dev", used to offset the devsw[] array in the
* routines below, is munged by the machine specific stand Makefiles
* to work for certain boots.
*/
jmp_buf exception;
devread(io)
register struct iob *io;
{
int cc;
io->i_flgs |= F_RDDATA;
io->i_error = 0;
cc = (*devsw[io->i_dev].dv_strategy)(io, F_READ);
io->i_flgs &= ~F_TYPEMASK;
#ifndef SMALL
if (scankbd())
_longjmp(exception, 1);
#endif
return (cc);
}
devwrite(io)
register struct iob *io;
{
int cc;
io->i_flgs |= F_WRDATA;
io->i_error = 0;
cc = (*devsw[io->i_dev].dv_strategy)(io, F_WRITE);
io->i_flgs &= ~F_TYPEMASK;
#ifndef SMALL
if (scankbd())
_longjmp(exception, 1);
#endif
return (cc);
}
devopen(io)
register struct iob *io;
{
int ret;
if (!(ret = (*devsw[io->i_dev].dv_open)(io)))
return (0);
#ifdef SMALL
printf("open error\n");
#else
printf("%s(%d,%d,%d,%d): ", devsw[io->i_dev].dv_name,
io->i_adapt, io->i_ctlr, io->i_unit, io->i_part);
switch(ret) {
case EIO:
break; /* already reported */
case EADAPT:
printf("bad adaptor number\n");
break;
case ECTLR:
printf("bad controller number\n");
break;
case EUNIT:
printf("bad drive number\n");
break;
case EPART:
printf("bad partition\n");
break;
case ERDLAB:
printf("can't read disk label\n");
break;
case EUNLAB:
printf("unlabeled\n");
break;
case ENXIO:
printf("bad device specification\n");
break;
default:
printf("unknown open error\n");
break;
}
#endif
return (ret);
}
devclose(io)
register struct iob *io;
{
(*devsw[io->i_dev].dv_close)(io);
}
devioctl(io, cmd, arg)
register struct iob *io;
int cmd;
caddr_t arg;
{
return ((*devsw[io->i_dev].dv_ioctl)(io, cmd, arg));
}
/* ARGSUSED */
nullsys(io)
struct iob *io;
{}
/* ARGSUSED */
nodev(io)
struct iob *io;
{
errno = EBADF;
return(-1);
}
/* ARGSUSED */
noioctl(io, cmd, arg)
struct iob *io;
int cmd;
caddr_t arg;
{
return (ECMD);
}