1 files changed, 114 insertions, 0 deletions
diff --git a/usr/src/uts/common/syscall/access.c b/usr/src/uts/common/syscall/access.c
new file mode 100644
index 0000000000..e13a754cc5
--- /dev/null
+++ b/usr/src/uts/common/syscall/access.c
@@ -0,0 +1,114 @@
+/*
+ * 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 2003 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
+/*	  All Rights Reserved  	*/
+
+/*
+ * Portions of this source code were derived from Berkeley 4.3 BSD
+ * under license from the Regents of the University of California.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/param.h>
+#include <sys/isa_defs.h>
+#include <sys/types.h>
+#include <sys/sysmacros.h>
+#include <sys/cred_impl.h>
+#include <sys/systm.h>
+#include <sys/errno.h>
+#include <sys/pathname.h>
+#include <sys/vnode.h>
+#include <sys/uio.h>
+#include <sys/cmn_err.h>
+#include <sys/debug.h>
+
+/*
+ * Determine accessibility of file.
+ */
+
+#define	E_OK	010	/* use effective ids */
+#define	R_OK	004
+#define	W_OK	002
+#define	X_OK	001
+
+int
+access(char *fname, int fmode)
+{
+	vnode_t *vp;
+	cred_t *tmpcr;
+	int error;
+	int mode;
+	int eok;
+	cred_t *cr;
+
+	if (fmode & ~(E_OK|R_OK|W_OK|X_OK))
+		return (set_errno(EINVAL));
+
+	mode = ((fmode & (R_OK|W_OK|X_OK)) << 6);
+
+	cr = CRED();
+
+	/* OK to use effective uid/gid, i.e., no need to crdup(CRED())? */
+	eok = (fmode & E_OK) ||
+		(cr->cr_uid == cr->cr_ruid && cr->cr_gid == cr->cr_rgid);
+
+	if (eok)
+		tmpcr = cr;
+	else {
+		tmpcr = crdup(cr);
+		tmpcr->cr_uid = cr->cr_ruid;
+		tmpcr->cr_gid = cr->cr_rgid;
+		tmpcr->cr_ruid = cr->cr_uid;
+		tmpcr->cr_rgid = cr->cr_gid;
+	}
+
+lookup:
+	if (error = lookupname(fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp)) {
+		if (error == ESTALE)
+			goto lookup;
+		if (!eok)
+			crfree(tmpcr);
+		return (set_errno(error));
+	}
+
+	if (mode) {
+		error = VOP_ACCESS(vp, mode, 0, tmpcr);
+		if (error) {
+			if (error == ESTALE) {
+				VN_RELE(vp);
+				goto lookup;
+			}
+			(void) set_errno(error);
+		}
+	}
+
+	if (!eok)
+		crfree(tmpcr);
+	VN_RELE(vp);
+	return (error);
+}