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