diff --git a/Modules/grpmodule.c b/Modules/grpmodule.c
new file mode 100644
index 0000000..edb50cf
--- /dev/null
+++ b/Modules/grpmodule.c
@@ -0,0 +1,118 @@
+/***********************************************************
+Copyright 1991, 1992, 1993, 1994 by Stichting Mathematisch Centrum,
+Amsterdam, The Netherlands.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in 
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* UNIX group file access module */
+
+#include "allobjects.h"
+#include "modsupport.h"
+
+#include <sys/types.h>
+#include <grp.h>
+
+static object *mkgrent(p)
+	struct group *p;
+{
+	object *v, *w;
+	char **member;
+	if ((w = newlistobject(0)) == NULL) {
+		return NULL;
+	}
+	for (member = p->gr_mem; *member != NULL; member++) {
+		object *x = newstringobject(*member);
+		if (x == NULL || addlistitem(w, x) != 0) {
+			XDECREF(x);
+			DECREF(w);
+			return NULL;
+		}
+	}
+	v = mkvalue("(sslO)",
+		       p->gr_name,
+		       p->gr_passwd,
+		       (long)p->gr_gid,
+		       w);
+	DECREF(w);
+	return v;
+}
+
+static object *grp_getgrgid(self, args)
+	object *self, *args;
+{
+	int gid;
+	struct group *p;
+	if (!getintarg(args, &gid))
+		return NULL;
+	if ((p = getgrgid(gid)) == NULL) {
+		err_setstr(KeyError, "getgrgid(): gid not found");
+		return NULL;
+	}
+	return mkgrent(p);
+}
+
+static object *grp_getgrnam(self, args)
+	object *self, *args;
+{
+	char *name;
+	struct group *p;
+	if (!getstrarg(args, &name))
+		return NULL;
+	if ((p = getgrnam(name)) == NULL) {
+		err_setstr(KeyError, "getgrnam(): name not found");
+		return NULL;
+	}
+	return mkgrent(p);
+}
+
+static object *grp_getgrall(self, args)
+	object *self, *args;
+{
+	object *d;
+	struct group *p;
+	if (!getnoarg(args))
+		return NULL;
+	if ((d = newlistobject(0)) == NULL)
+		return NULL;
+	setgrent();
+	while ((p = getgrent()) != NULL) {
+		object *v = mkgrent(p);
+		if (v == NULL || addlistitem(d, v) != 0) {
+			XDECREF(v);
+			DECREF(d);
+			return NULL;
+		}
+	}
+	return d;
+}
+
+static struct methodlist grp_methods[] = {
+	{"getgrgid",	grp_getgrgid},
+	{"getgrnam",	grp_getgrnam},
+	{"getgrall",	grp_getgrall},
+	{NULL,		NULL}		/* sentinel */
+};
+
+void
+initgrp()
+{
+	initmodule("grp", grp_methods);
+}