FreeBSD/Linux Kernel Cross Reference
sys/compat/common/vfs_syscalls_12.c

     /*      $NetBSD: vfs_syscalls_12.c,v 1.26 2008/06/24 11:18:15 ad Exp $  */
     
     /*
      * Copyright (c) 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     * the permission of UNIX System Laboratories, Inc.
     *
     * 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. 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.
     *
     *      From: @(#)vfs_syscalls.c        8.28 (Berkeley) 12/10/94
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_12.c,v 1.26 2008/06/24 11:18:15 ad Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/namei.h>
    #include <sys/filedesc.h>
    #include <sys/kernel.h>
    #include <sys/file.h>
    #include <sys/stat.h>
    #include <sys/socketvar.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/proc.h>
    #include <sys/uio.h>
    #include <sys/dirent.h>
    #include <sys/vfs_syscalls.h>
    
    #include <sys/syscallargs.h>
    
    #include <compat/sys/stat.h>
    
    /*
     * Convert from a new to an old stat structure.
     */
    void
    compat_12_stat_conv(const struct stat *st, struct stat12 *ost)
    {
    
            ost->st_dev = st->st_dev;
            ost->st_ino = st->st_ino;
            ost->st_mode = st->st_mode & 0xffff;
            if (st->st_nlink >= (1 << 15))
                    ost->st_nlink = (1 << 15) - 1;
            else
                    ost->st_nlink = st->st_nlink;
            ost->st_uid = st->st_uid;
            ost->st_gid = st->st_gid;
            ost->st_rdev = st->st_rdev;
            ost->st_atimespec = st->st_atimespec;
            ost->st_mtimespec = st->st_mtimespec;
            ost->st_ctimespec = st->st_ctimespec;
            ost->st_size = st->st_size;
            ost->st_blocks = st->st_blocks;
            ost->st_blksize = st->st_blksize;
            ost->st_flags = st->st_flags;
            ost->st_gen = st->st_gen;
    }
    
    /*
     * Read a block of directory entries in a file system independent format.
     */
    int
    compat_12_sys_getdirentries(struct lwp *l, const struct compat_12_sys_getdirentries_args *uap, register_t *retval)
    {
            /* {
                    syscallarg(int) fd;
                    syscallarg(char *) buf;
                    syscallarg(u_int) count;
                    syscallarg(long *) basep;
            } */
           struct file *fp;
           int error, done;
           long loff;
   
           /* fd_getvnode() will use the descriptor for us */
           if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
                   return error;
           if ((fp->f_flag & FREAD) == 0) {
                   error = EBADF;
                   goto out;
           }
   
           loff = fp->f_offset;
   
           error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE,
                           SCARG(uap, count), &done, l, 0, 0);
   
           error = copyout(&loff, SCARG(uap, basep), sizeof(long));
           *retval = done;
    out:
           fd_putfile(SCARG(uap, fd));
           return error;
   }
   
   /*
    * Get file status; this version follows links.
    */
   /* ARGSUSED */
   int
   compat_12_sys_stat(struct lwp *l, const struct compat_12_sys_stat_args *uap, register_t *retval)
   {
           /* {
                   syscallarg(const char *) path;
                   syscallarg(struct stat12 *) ub;
           } */
           struct stat sb;
           struct stat12 osb;
           int error;
   
           error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb);
           if (error)
                   return (error);
           compat_12_stat_conv(&sb, &osb);
           error = copyout(&osb, SCARG(uap, ub), sizeof (osb));
           return (error);
   }
   
   
   /*
    * Get file status; this version does not follow links.
    */
   /* ARGSUSED */
   int
   compat_12_sys_lstat(struct lwp *l, const struct compat_12_sys_lstat_args *uap, register_t *retval)
   {
           /* {
                   syscallarg(const char *) path;
                   syscallarg(struct stat12 *) ub;
           } */
           struct stat sb;
           struct stat12 osb;
           int error;
   
           error = do_sys_stat(SCARG(uap, path), NOFOLLOW, &sb);
           if (error)
                   return (error);
           compat_12_stat_conv(&sb, &osb);
           error = copyout(&osb, SCARG(uap, ub), sizeof (osb));
           return (error);
   }
   
   /*
    * Return status information about a file descriptor.
    */
   /* ARGSUSED */
   int
   compat_12_sys_fstat(struct lwp *l, const struct compat_12_sys_fstat_args *uap, register_t *retval)
   {
           /* {
                   syscallarg(int) fd;
                   syscallarg(struct stat12 *) sb;
           } */
           int fd = SCARG(uap, fd);
           struct file *fp;
           struct stat ub;
           struct stat12 oub;
           int error;
   
           if ((fp = fd_getfile(fd)) == NULL)
                   return (EBADF);
           error = (*fp->f_ops->fo_stat)(fp, &ub);
           fd_putfile(fd);
           if (error == 0) {
                   compat_12_stat_conv(&ub, &oub);
                   error = copyout(&oub, SCARG(uap, sb), sizeof (oub));
           }
           return (error);
   }

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