usr/src/sys/news3400/newsos/news_compat.c

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * 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.
 *
 *      @(#)news_compat.c       8.1 (Berkeley) 6/11/93
 *
 * from: $Hdr: sun_misc.c,v 1.12 92/07/12 13:26:10 torek Exp $
 */

/*
 * NEWS-OS compatibility module.
 *
 * NEWS-OS system calls that are implemented differently in BSD are
 * handled here.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/vnode.h>
#include <sys/uio.h>
#include <sys/wait.h>

#include <miscfs/specfs/specdev.h>

#include <vm/vm.h>

#if 0
/* here is the sun layout (not used directly): */
struct sun_dirent {
        long    d_off;
        u_long  d_fileno;
        u_short d_reclen;
        u_short d_namlen;
        char    d_name[256];
};
#endif
/* and the BSD layout: */
struct bsd_dirent {
        u_long  d_fileno;
        u_short d_reclen;
        u_short d_namlen;
        char    d_name[256];
};

/*
 * Read Sun-style directory entries.  We suck them into kernel space so
 * that they can be massaged before being copied out to user code.  Like
 * SunOS, we squish out `empty' entries.
 *
 * This is quite ugly, but what do you expect from compatibility code?
 */
struct sun_getdents_args {
        int     fd;
        char    *buf;
        int     nbytes;
};
sun_getdents(p, uap, retval)
        struct proc *p;
        register struct sun_getdents_args *uap;
        int *retval;
{
        register struct vnode *vp;
        register caddr_t inp, buf;      /* BSD-format */
        register int len, reclen;       /* BSD-format */
        register caddr_t outp;          /* Sun-format */
        register int resid;             /* Sun-format */
        struct file *fp;
        struct uio auio;
        struct iovec aiov;
        off_t off;                      /* true file offset */
        long soff;                      /* Sun file offset */
        int buflen, error, eofflag;
#define SUN_RECLEN(reclen) (reclen + sizeof(long))

        if ((error = getvnode(p->p_fd, uap->fd, &fp)) != 0)
                return (error);
        if ((fp->f_flag & FREAD) == 0)
                return (EBADF);
        vp = (struct vnode *)fp->f_data;
        if (vp->v_type != VDIR) /* XXX  vnode readdir op should do this */
                return (EINVAL);
        buflen = min(MAXBSIZE, uap->nbytes);
        buf = malloc(buflen, M_TEMP, M_WAITOK);
        VOP_LOCK(vp);
        off = fp->f_offset;
again:
        aiov.iov_base = buf;
        aiov.iov_len = buflen;
        auio.uio_iov = &aiov;
        auio.uio_iovcnt = 1;
        auio.uio_rw = UIO_READ;
        auio.uio_segflg = UIO_SYSSPACE;
        auio.uio_procp = p;
        auio.uio_resid = buflen;
        auio.uio_offset = off;
        /*
         * First we read into the malloc'ed buffer, then
         * we massage it into user space, one record at a time.
         */
        if (error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag))
                goto out;
        inp = buf;
        outp = uap->buf;
        resid = uap->nbytes;
        if ((len = buflen - auio.uio_resid) == 0)
                goto eof;
        for (; len > 0; len -= reclen) {
                reclen = ((struct bsd_dirent *)inp)->d_reclen;
                if (reclen & 3)
                        panic("sun_getdents");
                off += reclen;          /* each entry points to next */
                if (((struct bsd_dirent *)inp)->d_fileno == 0) {
                        inp += reclen;  /* it is a hole; squish it out */
                        continue;
                }
                if (reclen > len || resid < SUN_RECLEN(reclen)) {
                        /* entry too big for buffer, so just stop */
                        outp++;
                        break;
                }
                /* copy out a Sun-shaped dirent */
                ((struct bsd_dirent *)inp)->d_reclen = SUN_RECLEN(reclen);
                soff = off;
                if ((error = copyout((caddr_t)&soff, outp, sizeof soff)) != 0 ||
                    (error = copyout(inp, outp + sizeof soff, reclen)) != 0)
                        goto out;
                /* advance past this real entry */
                inp += reclen;
                /* advance output past Sun-shaped entry */
                outp += SUN_RECLEN(reclen);
                resid -= SUN_RECLEN(reclen);
        }
        /* if we squished out the whole block, try again */
        if (outp == uap->buf)
                goto again;
        fp->f_offset = off;             /* update the vnode offset */
eof:
        *retval = uap->nbytes - resid;
out:
        VOP_UNLOCK(vp);
        free(buf, M_TEMP);
        return (error);
}

#define MAXDOMAINNAME   64
char    sun_domainname[MAXDOMAINNAME];
int     sun_domainnamelen = 1;

struct sun_getdomainname_args {
        char    *name;
        int     namelen;
};
sun_getdomainname(p, uap, retval)
        struct proc *p;
        struct sun_getdomainname_args *uap;
        int *retval;
{
        register int l = min(uap->namelen, sun_domainnamelen + 1);

        return (copyout(sun_domainname, uap->name, l));
}

struct sun_setdomainname_args {
        char    *name;
        int     namelen;
};
sun_setdomainname(p, uap, retval)
        struct proc *p;
        struct sun_setdomainname_args *uap;
        int *retval;
{
        register int l = uap->namelen, error;

        if (l >= MAXDOMAINNAME)
                return (EINVAL);        /* ??? ENAMETOOLONG? */
        if (error = suser(p->p_ucred, &p->p_acflag))
                return (error);
        if (error = copyin(uap->name, sun_domainname, l))
                return (error);
        sun_domainname[l] = 0;
        return (0);
}

/*
 * setenvp system call
 */
struct news_setenvp_args {
        char    **envp;
};
news_setenvp(p, args, retval)
        struct proc *p;
        struct news_setenvp_args *args;
        int *retval;
{

        return (0);
}

/*
 * sysnews system call
 */
struct news_sysnews_args {
        int     ctrltype;
        int     arg1, arg2, arg3, arg4;
};
news_sysnews(p, args, retval)
        struct proc *p;
        struct news_sysnews_args *args;
        int *retval;
{

        return (0);
}