/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/copyops.h>
#include <sys/errno.h>
#include <sys/kmem.h>
#include <sys/param.h>
#include <sys/pathname.h>
#include <sys/sysmacros.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/vnode.h>
int
getcwd(char *buf, size_t buflen)
{
int err;
char *kbuf;
size_t kbuflen;
/*
* The user should be able to specify any size buffer, but we don't want
* to arbitrarily allocate huge kernel buffers just because the user
* requests it. So we'll start with MAXPATHLEN (which should hold any
* normal path), and only increase it if we fail with ERANGE.
*/
kbuflen = MIN(buflen, MAXPATHLEN);
for (;;) {
kbuf = kmem_alloc(kbuflen, KM_SLEEP);
if (((err = dogetcwd(kbuf, kbuflen)) == 0) &&
(copyout(kbuf, buf, strlen(kbuf) + 1) != 0))
err = EFAULT;
kmem_free(kbuf, kbuflen);
if (err == ENAMETOOLONG) {
/*
* If the user's buffer really was too small, give up.
* For some reason, getcwd() uses ERANGE for this case.
*/
if (kbuflen == buflen) {
err = ERANGE;
break;
}
kbuflen = MIN(kbuflen * 2, buflen);
} else {
break;
}
}
return ((err != 0) ? set_errno(err) : 0);
}