--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usr/src/cmd/groups/groups.c	Tue Jun 02 18:56:50 2009 +0900
@@ -0,0 +1,137 @@
+/*
+ * 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.
+ */
+
+/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
+/*	  All Rights Reserved  	*/
+
+/*
+ * University Copyright- Copyright (c) 1982, 1986, 1988
+ * The Regents of the University of California
+ * All Rights Reserved
+ *
+ * University Acknowledgment- Portions of this document are derived from
+ * software developed by the University of California, Berkeley, and its
+ * contributors.
+ */
+
+#pragma ident	"@(#)groups.c	1.12	05/06/23 SMI"
+
+/*
+ * groups - show group memberships
+ */
+/* LINTLIBRARY PROTOLIB1 */
+
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+extern struct group *getgrgid();
+extern struct passwd *getpwnam();
+extern int _getgroupsbymember(const char *, gid_t[], int, int);
+
+static void showgroups();
+
+static int ngroups_max;
+
+int
+main(int argc, char *argv[])
+{
+	int xval = 0;
+	struct passwd *pw;
+
+	ngroups_max = sysconf(_SC_NGROUPS_MAX);
+
+	if (ngroups_max < 0) {
+		(void) fprintf(stderr,
+			"groups: could not get configuration info\n");
+		exit(1);
+	}
+
+	if (ngroups_max == 0)
+		exit(0);
+
+	if (argc == 1) {
+
+		if ((pw = getpwuid(getuid())) == NULL) {
+			(void) fprintf(stderr, "groups: No passwd entry\n");
+			xval = 1;
+		} else
+			showgroups(pw);
+
+	} else while (*++argv) {
+
+		if ((pw = getpwnam(*argv)) == NULL) {
+			(void) fprintf(stderr,
+				"groups: %s : No such user\n", *argv);
+			xval = 1;
+		} else {
+			if (argc > 2)
+				(void) printf("%s : ", *argv);
+			showgroups(pw);
+		}
+	}
+
+	return (xval);
+
+}
+
+static void
+showgroups(struct passwd *pw)
+{
+	struct group *gr;
+	static gid_t *groups = NULL;
+	int ngroups;
+	int i;
+
+	if (groups == NULL) {
+		if ((groups = (gid_t *)calloc((uint_t)ngroups_max,
+						sizeof (gid_t))) == 0) {
+			(void) fprintf(stderr,
+				"allocation of %d bytes failed\n",
+				ngroups_max * sizeof (gid_t));
+			exit(1);
+		}
+	}
+	groups[0] = pw->pw_gid;
+
+	ngroups = _getgroupsbymember(pw->pw_name, groups, ngroups_max, 1);
+
+	if (gr = getgrgid(groups[0]))
+		(void) printf("%s", gr->gr_name);
+	else
+		(void) printf("%d", (int)pw->pw_gid);
+
+	for (i = 1; i < ngroups; i++) {
+		if ((gr = getgrgid(groups[i])))
+			(void) printf(" %s", gr->gr_name);
+		else
+			(void) printf(" %d", (int)groups[i]);
+	}
+
+	(void) printf("\n");
+}