/*
 * Copyright (C) 2009 University of Wroclaw. Department of Computer Science
 *    http://www.ii.uni.wroc.pl/
 * Copyright (C) 2009 Mateusz Kocielski, Artur Koninski, Pawel Wieczorek
 *    http://bitbucket.org/wieczyk/impala/
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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.
 *
 * $Id$
 */

#include <sys/errno.h>
#include <sys/types.h>
#include <sys/thread.h>
#include <sys/sched.h>
#include <sys/utils.h>
#include <sys/syscall.h>
#include <sys/file.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/vm.h>

typedef struct chdir_args chdir_args;

struct chdir_args {
    char *pathname;
};

errno_t sc_chdir(thread_t *p, syscall_result_t *r, chdir_args *args);

errno_t
sc_chdir(thread_t *t, syscall_result_t *r, chdir_args *args)
{
    int res=0;
    proc_t *p = t->thr_proc;
    vnode_t *node;
    char pname[PATH_MAX+1];
    if((res = copyinstr(pname, args->pathname, PATH_MAX)))
        return res;
    res = vfs_lookup(p->p_curdir, &node, pname, t, LKP_NORMAL);
    if(res)
        return res;
    if(node->v_type!=VNODE_TYPE_DIR) {
        vrele(node);
        return -ENOTDIR;
    }
    vnode_t *old = p->p_curdir;
    p->p_curdir = node;
    vrele(old);
    r->result = 0;
    return -EOK;
}

