Subversion Repositories planix.SVN

#include        "u.h"
#include <errno.h>
#include        "lib.h"
#include        "dat.h"
#include        "fns.h"
#include        "error.h"

#undef pread
#undef pwrite

Chan*
lfdchan(int fd)
{
        Chan *c;
        
        c = newchan();
        c->type = devno('L', 0);
        c->aux = (void*)(uintptr)fd;
        c->name = newcname("fd");
        c->mode = ORDWR;
        c->qid.type = 0;
        c->qid.path = 0;
        c->qid.vers = 0;
        c->dev = 0;
        c->offset = 0;
        return c;
}

int
lfdfd(int fd)
{
        return newfd(lfdchan(fd));
}

static Chan*
lfdattach(char *x)
{
        USED(x);
        
        error(Egreg);
        return nil;
}

static Walkqid*
lfdwalk(Chan *c, Chan *nc, char **name, int nname)
{
        USED(c);
        USED(nc);
        USED(name);
        USED(nname);
        
        error(Egreg);
        return nil;
}

static int
lfdstat(Chan *c, uchar *dp, int n)
{
        USED(c);
        USED(dp);
        USED(n);
        error(Egreg);
        return -1;
}

static Chan*
lfdopen(Chan *c, int omode)
{
        USED(c);
        USED(omode);
        
        error(Egreg);
        return nil;
}

static void
lfdclose(Chan *c)
{
        close((int)(uintptr)c->aux);
}

static long
lfdread(Chan *c, void *buf, long n, vlong off)
{
        USED(off);      /* can't pread on pipes */
        n = read((int)(uintptr)c->aux, buf, n);
        if(n < 0){
                iprint("error %d\n", errno);
                oserror();
        }
        return n;
}

static long
lfdwrite(Chan *c, void *buf, long n, vlong off)
{
        USED(off);      /* can't pread on pipes */

        n = write((int)(uintptr)c->aux, buf, n);
        if(n < 0){
                iprint("error %d\n", errno);
                oserror();
        }
        return n;
}

Dev lfddevtab = {
        'L',
        "lfd",
        
        devreset,
        devinit,
        devshutdown,
        lfdattach,
        lfdwalk,
        lfdstat,
        lfdopen,
        devcreate,
        lfdclose,
        lfdread,
        devbread,
        lfdwrite,
        devbwrite,
        devremove,
        devwstat,
};