1 files changed, 128 insertions, 0 deletions
diff --git a/usr/src/lib/libcmdutils/common/sysattrs.c b/usr/src/lib/libcmdutils/common/sysattrs.c
new file mode 100644
index 0000000000..a22e8e5e21
--- /dev/null
+++ b/usr/src/lib/libcmdutils/common/sysattrs.c
@@ -0,0 +1,128 @@
+/*
+ * 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 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <c_synonyms.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <libgen.h>
+#include <attr.h>
+#include <fcntl.h>
+#include <errno.h>
+#include "libcmdutils.h"
+
+/*
+ * Returns the status of attempting to obtain the extended system
+ * attributes in the specified view.
+ *
+ * Note: If obtaining status for an extended attribute file, the caller must
+ * chdir into the hidden directory prior to calling sysattr_status().
+ *
+ * Returns 1 if the extended system attributes were obtained, otherwise
+ * returns 0.
+ */
+int
+sysattr_status(char *file, xattr_view_t view)
+{
+	nvlist_t	*response;
+	int		saveerrno;
+	int		status;
+
+	if (nvlist_alloc(&response, NV_UNIQUE_NAME, 0) != 0) {
+		return (0);
+	}
+
+	status = getattrat(AT_FDCWD, view, file, &response);
+
+	saveerrno = errno;
+	(void) nvlist_free(response);
+	errno = saveerrno;
+
+	return (status == 0);
+}
+
+/*
+ * Returns the type of the specified in file.  If the file name matches
+ * the name of either a read-only or read-write extended system attribute
+ * file then sysattr_type() returns the type of file:
+ * 	return value	file type
+ *	------------	---------
+ *	_RO_SATTR	read-only extended system attribute file
+ *	_RW_SATTR	read-write extended system attribute file
+ *	_NOT_SATTR	neither a read-only or read-write extended system
+ *			attribute file.
+ */
+int
+sysattr_type(char *file)
+{
+	if (file == NULL) {
+		errno = ENOENT;
+		return (_NOT_SATTR);
+	}
+
+	if (strcmp(basename(file), file) != 0) {
+		errno = EINVAL;
+		return (_NOT_SATTR);
+	}
+
+	errno = 0;
+	if (strcmp(file, VIEW_READONLY) == 0) {
+		return (_RO_SATTR);
+	} else if (strcmp(file, VIEW_READWRITE) == 0) {
+		return (_RW_SATTR);
+	} else {
+		return (_NOT_SATTR);
+	}
+}
+
+/*
+ * Call sysattr_support() instead of pathconf(file, _PC_SATTR_ENABLED) or
+ * pathconf(file, _PC_SATTR_EXISTS) so that if pathconf() fails over NFS, we
+ * can still try to figure out if extended system attributes are supported by
+ * testing for a valid extended system attribute file.
+ *
+ * 'name' can have the values _PC_SATTR_ENABLED or _PC_SATTR_EXISTS.
+ *
+ * Returns 1 if the underlying file system supports extended system attributes,
+ * otherwise, returns -1.
+ */
+int
+sysattr_support(char *file, int name)
+{
+	int	rc;
+
+	errno = 0;
+	if ((name != _PC_SATTR_ENABLED) &&
+	    (name != _PC_SATTR_EXISTS)) {
+		errno = EINVAL;
+		return (-1);
+	}
+	if (((rc = pathconf(file, name)) == 1) || (errno != EINVAL)) {
+		return (rc);
+	}
+	return (sysattr_status(file, XATTR_VIEW_READONLY));
+}