eliminate magic constants

[unix-history] / usr / src / sys / tahoe / stand / conf.c

/*      conf.c  1.2     86/07/16        */
/*      conf.c  6.1     83/07/29        */

#include "../machine/pte.h"

#include "param.h"
#include "inode.h"
#include "fs.h"

#include "saio.h"

devread(io)
       register struct iob *io;
{
       int cc;

       io->i_flgs |= F_RDDATA;
       io->i_error = 0;
       cc = (*devsw[io->i_ino.i_dev].dv_strategy)(io, READ);
       io->i_flgs &= ~F_TYPEMASK;
       return (cc);
}

devwrite(io)
       register struct iob *io;
{
       int cc;

       io->i_flgs |= F_WRDATA;
       io->i_error = 0;
       cc = (*devsw[io->i_ino.i_dev].dv_strategy)(io, WRITE);
       io->i_flgs &= ~F_TYPEMASK;
       return (cc);
}

devopen(io)
       register struct iob *io;
{

       (*devsw[io->i_ino.i_dev].dv_open)(io);
}

devclose(io)
       register struct iob *io;
{

       (*devsw[io->i_ino.i_dev].dv_close)(io);
}

/*ARGSUSED*/
nullsys(io) struct iob *io; {}
nullopen(io) struct iob *io; { _stop("bad device type"); }

int     udstrategy(), udopen();
int     vdstrategy(), vdopen();
int     cystrategy(), cyopen(), cyclose();

struct devsw devsw[] = {
       { "ud", udstrategy,     udopen,         nullsys },
       { "dk", vdstrategy,     vdopen,         nullsys },
#ifdef notdef
       { "xp", xpstrategy,     xpopen,         nullsys },
#else
       { "xp", nullopen,       nullsys,        nullsys },
#endif
       { "cy", cystrategy,     cyopen,         cyclose },
       { 0 }
};