fattach.c revision 7257d1b4d25bfac0c802847390e98a464fd787ac
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Attach a STREAMS or door based file descriptor to an object in the file
* system name space.
*/
#pragma weak _fattach = fattach
#include "lint.h"
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stropts.h>
#include <sys/door.h>
#include <sys/fs/namenode.h>
#include <sys/mount.h>
#include <unistd.h>
#include <string.h>
#include "libc.h"
int
fattach(int fildes, const char *path)
{
struct namefd namefdp;
struct door_info dinfo;
int s;
char buf[MAXPATHLEN];
/* Only STREAMS and doors allowed to be mounted */
if ((s = isastream(fildes)) == 1 || __door_info(fildes, &dinfo) == 0) {
namefdp.fd = fildes;
if (path == NULL || *path == '\0') {
errno = ENOENT;
return (-1);
} else if (*path != '/') {
/*
* The mount point must be an absolute path.
*/
if (getcwd(buf, sizeof (buf)) == NULL) {
/* errno already set */
return (-1);
}
/*
* The kernel will truncate the path if it would have
* turned into something more than MAXPATHLEN bytes.
* So we do the same here.
*/
if (strlcat(buf, "/", sizeof (buf)) >= sizeof (buf) ||
strlcat(buf, path, sizeof (buf)) >= sizeof (buf)) {
errno = ENAMETOOLONG;
return (-1);
}
path = buf;
}
return (mount((char *)NULL, path, MS_DATA|MS_NOMNTTAB,
(const char *)"namefs", (char *)&namefdp,
sizeof (struct namefd), NULL, 0));
} else if (s == 0) {
/* Not a STREAM */
errno = EINVAL;
return (-1);
} else {
/* errno already set */
return (-1);
}
}