FreeBSD/Linux Kernel Cross Reference
sys/emulation/linux/linux_getcwd.c

     /* $FreeBSD: src/sys/compat/linux/linux_getcwd.c,v 1.2.2.3 2001/11/05 19:08:22 marcel Exp $ */
     /* $DragonFly: src/sys/emulation/linux/linux_getcwd.c,v 1.23 2006/12/23 00:27:02 swildner Exp $ */
     /* $OpenBSD: linux_getcwd.c,v 1.2 2001/05/16 12:50:21 ho Exp $ */
     /* $NetBSD: vfs_getcwd.c,v 1.3.2.3 1999/07/11 10:24:09 sommerfeld Exp $ */
     
     /*-
      * Copyright (c) 1999 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
     * This code is derived from software contributed to The NetBSD Foundation
     * by Bill Sommerfeld.
     *
     * 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 NetBSD
     *        Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    #include "opt_compat.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/sysproto.h>
    #include <sys/filedesc.h>
    #include <sys/kernel.h>
    #include <sys/file.h>
    #include <sys/stat.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/proc.h>
    #include <sys/namei.h>
    #include <sys/uio.h>
    #include <sys/malloc.h>
    #include <sys/dirent.h>
    #include <sys/kern_syscall.h>
    #include <vfs/ufs/dir.h>        /* XXX only for DIRBLKSIZ */
    
    #include <sys/mplock2.h>
    
    #include <arch_linux/linux.h>
    #include <arch_linux/linux_proto.h>
    #include "linux_util.h"
    
    /*
     * Find pathname of process's current directory.
     *
     * Use vfs vnode-to-name reverse cache; if that fails, fall back
     * to reading directory contents.
     *
     * MPALMOSTSAFE
     */
    int
    sys_linux_getcwd(struct linux_getcwd_args *args)
    {
            int buflen;
            int error;
            char *buf;
            char *bp;
    
    #ifdef DEBUG
            kprintf("Linux-emul(%d): getcwd(%p, %d)\n", 
                (curthread->td_proc ? (int)curthread->td_proc->p_pid : -1),
                args->buf, args->bufsize);
    #endif
            buflen = args->bufsize;
            if (buflen < 2)
                    return (EINVAL);
            if (buflen > MAXPATHLEN)
                    buflen = MAXPATHLEN;
    
            buf = kmalloc(buflen, M_TEMP, M_WAITOK);
            get_mplock();
            bp = kern_getcwd(buf, buflen, &error);
            rel_mplock();
            if (error == 0) {
                    buflen = strlen(bp) + 1;
                    error = copyout(bp, args->buf, buflen);
                   args->sysmsg_result = buflen;
           }
           kfree(buf, M_TEMP);
           return (error);
   }
   

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