223 lines
6.6 KiB
C
223 lines
6.6 KiB
C
/* $NetBSD: irix_dirent.c,v 1.3 2001/12/26 10:54:56 manu Exp $ */
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/*-
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* Copyright (c) 1994, 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas and Emmanuel Dreyfus.
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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 NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: irix_dirent.c,v 1.3 2001/12/26 10:54:56 manu Exp $");
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#include <sys/types.h>
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#include <sys/signal.h>
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/dirent.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/mount.h>
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#include <sys/malloc.h>
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#include <sys/namei.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <compat/common/compat_util.h>
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#include <compat/irix/irix_types.h>
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#include <compat/irix/irix_signal.h>
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#include <compat/irix/irix_syscall.h>
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#include <compat/irix/irix_syscallargs.h>
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/*
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* irix_sys_ngetdents() is nearly a plain copy of svr4_sys_getdents(), from
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* sys/compat/svr4/svr4_misc.c. We need a custmized version to handle the
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* eof flag.
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* Obviously the code should be merged, but it would require some
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* change to the way COMPAT_SVR4 code is set up.
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*/
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#define SVR4_RECLEN(de,namlen) ALIGN((SVR4_NAMEOFF(de) + (namlen) + 1))
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#define SVR4_NAMEOFF(dp) ((char *)&(dp)->d_name - (char *)dp)
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int
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irix_sys_ngetdents(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct irix_sys_ngetdents_args /* {
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syscallarg(int) fildes;
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syscallarg(irix_dirent_t *) buf;
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syscallarg(unsigned short) nbyte;
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syscallarg(int *) eof;
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} */ *uap = v;
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struct dirent *bdp;
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struct vnode *vp;
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caddr_t inp, buf; /* BSD-format */
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int len, reclen; /* BSD-format */
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caddr_t outp; /* SVR4-format */
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int resid, svr4_reclen; /* SVR4-format */
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struct file *fp;
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struct uio auio;
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struct iovec aiov;
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struct irix_dirent idb;
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off_t off; /* true file offset */
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int buflen, error, eofflag;
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off_t *cookiebuf = NULL, *cookie;
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int ncookies;
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/* getvnode() will use the descriptor for us */
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if ((error = getvnode(p->p_fd, SCARG(uap, fildes), &fp)) != 0)
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return (error);
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if ((fp->f_flag & FREAD) == 0) {
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error = EBADF;
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goto out1;
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}
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vp = (struct vnode *)fp->f_data;
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if (vp->v_type != VDIR) {
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error = EINVAL;
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goto out1;
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}
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buflen = min(MAXBSIZE, SCARG(uap, nbyte));
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buf = malloc(buflen, M_TEMP, M_WAITOK);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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off = fp->f_offset;
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again:
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aiov.iov_base = buf;
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aiov.iov_len = buflen;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_rw = UIO_READ;
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auio.uio_segflg = UIO_SYSSPACE;
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auio.uio_procp = p;
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auio.uio_resid = buflen;
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auio.uio_offset = off;
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/*
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* First we read into the malloc'ed buffer, then
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* we massage it into user space, one record at a time.
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*/
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error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf,
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&ncookies);
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if (error)
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goto out;
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inp = buf;
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outp = (char *)SCARG(uap, buf);
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resid = SCARG(uap, nbyte);
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if ((len = buflen - auio.uio_resid) == 0)
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goto eof;
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for (cookie = cookiebuf; len > 0; len -= reclen) {
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bdp = (struct dirent *)inp;
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reclen = bdp->d_reclen;
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if (reclen & 3)
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panic("irix_getdents: bad reclen");
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off = *cookie++; /* each entry points to the next */
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if ((off >> 32) != 0) {
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compat_offseterr(vp, "irix_getdents");
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error = EINVAL;
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goto out;
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}
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if (bdp->d_fileno == 0) {
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inp += reclen; /* it is a hole; squish it out */
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continue;
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}
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svr4_reclen = SVR4_RECLEN(&idb, bdp->d_namlen);
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if (reclen > len || resid < svr4_reclen) {
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/* entry too big for buffer, so just stop */
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outp++;
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break;
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}
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/*
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* Massage in place to make a SVR4-shaped dirent (otherwise
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* we have to worry about touching user memory outside of
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* the copyout() call).
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*/
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idb.d_ino = (irix_ino_t)bdp->d_fileno;
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idb.d_off = (irix_off_t)off;
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idb.d_reclen = (u_short)svr4_reclen;
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strcpy(idb.d_name, bdp->d_name);
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if ((error = copyout((caddr_t)&idb, outp, svr4_reclen)))
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goto out;
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/* advance past this real entry */
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inp += reclen;
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/* advance output past SVR4-shaped entry */
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outp += svr4_reclen;
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resid -= svr4_reclen;
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}
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/* if we squished out the whole block, try again */
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if (outp == (char *)SCARG(uap, buf))
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goto again;
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fp->f_offset = off; /* update the vnode offset */
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eof:
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*retval = SCARG(uap, nbyte) - resid;
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out:
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VOP_UNLOCK(vp, 0);
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if (cookiebuf)
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free(cookiebuf, M_TEMP);
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free(buf, M_TEMP);
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out1:
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FILE_UNUSE(fp, p);
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if (SCARG(uap, eof) != NULL)
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error = copyout(&eofflag, SCARG(uap, eof), sizeof(int));
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return error;
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}
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int
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irix_sys_getdents(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct irix_sys_ngetdents_args /* {
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syscallarg(int) fildes;
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syscallarg(irix_dirent_t *) buf;
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syscallarg(unsigned short) nbyte;
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syscallarg(int *) eof;
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} */ *uap = v;
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struct irix_sys_ngetdents_args cup;
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SCARG(&cup, fildes) = SCARG(uap, fildes);
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SCARG(&cup, buf) = SCARG(uap, buf);
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SCARG(&cup, nbyte) = SCARG(uap, nbyte);
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SCARG(&cup, eof) = NULL;
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return irix_sys_ngetdents(p, (void *)&cup, retval);
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}
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