[unix-history] / usr / src / sys / stand.att / dev.c

/*
* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*
*      @(#)dev.c       7.16 (Berkeley) %G%
*/

#include <sys/param.h>
#include <setjmp.h>
#include <stand.att/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);
}