The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /* $OpenBSD: linux_getcwd.c,v 1.2 2001/05/16 12:50:21 ho Exp $ */
    2 /* $NetBSD: vfs_getcwd.c,v 1.3.2.3 1999/07/11 10:24:09 sommerfeld Exp $ */
    3 /*-
    4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
    5  * Copyright (c) 2015 The FreeBSD Foundation
    6  * All rights reserved.
    7  *
    8  * This code is derived from software contributed to The NetBSD Foundation
    9  * by Bill Sommerfeld.
   10  *
   11  * Portions of this software were developed by Edward Tomasz Napierala
   12  * under sponsorship from the FreeBSD Foundation.
   13  *
   14  * Redistribution and use in source and binary forms, with or without
   15  * modification, are permitted provided that the following conditions
   16  * are met:
   17  * 1. Redistributions of source code must retain the above copyright
   18  *    notice, this list of conditions and the following disclaimer.
   19  * 2. Redistributions in binary form must reproduce the above copyright
   20  *    notice, this list of conditions and the following disclaimer in the
   21  *    documentation and/or other materials provided with the distribution.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   33  * POSSIBILITY OF SUCH DAMAGE.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: stable/11/sys/compat/linux/linux_getcwd.c 283427 2015-05-24 16:14:41Z dchagin $");
   38 
   39 #include "opt_compat.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/syscallsubr.h>
   44 #include <sys/proc.h>
   45 #include <sys/malloc.h>
   46 
   47 #ifdef COMPAT_LINUX32
   48 #include <machine/../linux32/linux.h>
   49 #include <machine/../linux32/linux32_proto.h>
   50 #else
   51 #include <machine/../linux/linux.h>
   52 #include <machine/../linux/linux_proto.h>
   53 #endif
   54 #include <compat/linux/linux_misc.h>
   55 #include <compat/linux/linux_util.h>
   56 
   57 /*
   58  * Find pathname of process's current directory.
   59  */
   60 int
   61 linux_getcwd(struct thread *td, struct linux_getcwd_args *args)
   62 {
   63         char *path;
   64         int error, lenused;
   65 
   66 #ifdef DEBUG
   67         if (ldebug(getcwd))
   68                 printf(ARGS(getcwd, "%p, %ld"), args->buf, (long)args->bufsize);
   69 #endif
   70 
   71         /*
   72          * Linux returns ERANGE instead of EINVAL.
   73          */
   74         if (args->bufsize < 2)
   75                 return (ERANGE);
   76 
   77         path = malloc(LINUX_PATH_MAX, M_LINUX, M_WAITOK);
   78 
   79         error = kern___getcwd(td, path, UIO_SYSSPACE, args->bufsize,
   80             LINUX_PATH_MAX);
   81         if (error == 0) {
   82                 lenused = strlen(path) + 1;
   83                 error = copyout(path, args->buf, lenused);
   84                 if (error == 0)
   85                         td->td_retval[0] = lenused;
   86         }
   87 
   88         free(path, M_LINUX);
   89         return (error);
   90 }

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