Index: configure.in
===================================================================
RCS file: /cvsroot/guile/guile/guile-core/configure.in,v
retrieving revision 1.222
diff -u -r1.222 configure.in
--- configure.in	21 Jun 2003 00:15:09 -0000	1.222
+++ configure.in	30 Jun 2003 22:32:37 -0000
@@ -591,7 +591,7 @@
     [Define if the system supports Unix-domain (file-domain) sockets.])
 fi
 
-AC_CHECK_FUNCS(socketpair getgroups setpwent pause tzset)
+AC_CHECK_FUNCS(socketpair getgroups setgroups setpwent pause tzset)
 
 AC_CHECK_FUNCS(sethostent   gethostent   endhostent   dnl
                setnetent    getnetent    endnetent    dnl
Index: libguile/posix.c
===================================================================
RCS file: /cvsroot/guile/guile/guile-core/libguile/posix.c,v
retrieving revision 1.118
diff -u -r1.118 posix.c
--- libguile/posix.c	14 Jun 2003 05:36:02 -0000	1.118
+++ libguile/posix.c	30 Jun 2003 22:32:38 -0000
@@ -228,6 +228,46 @@
 #undef FUNC_NAME  
 #endif
 
+#ifdef HAVE_SETGROUPS
+SCM_DEFINE (scm_setgroups, "setgroups", 1, 0, 0,
+            (SCM group_vec),
+	    "Set the supplementary group IDs to those found in the vector argument.")
+#define FUNC_NAME s_scm_setgroups
+{
+  size_t ngroups;
+  size_t size;
+  size_t i;
+  int result;
+  int save_errno;
+  GETGROUPS_T *groups;
+
+  SCM_VALIDATE_VECTOR (SCM_ARG1, group_vec);
+
+  ngroups = SCM_VECTOR_LENGTH (group_vec);
+
+  /* validate before allocating, so we don't have to worry about leaks */
+  for (i = 0; i < ngroups; i++)
+    SCM_VALIDATE_INUM (0, SCM_VECTOR_REF (group_vec, i));
+
+  size = ngroups * sizeof (GETGROUPS_T);
+  /* XXX - if (size / sizeof (GETGROUPS_T) != ngroups) out-of-range */
+  groups = scm_malloc (size);
+  if (groups == NULL)
+    SCM_MEMORY_ERROR;
+  for(i = 0; i < ngroups; i++)
+    groups [i] = SCM_INUM (SCM_VECTOR_REF (group_vec, i));
+
+  result = setgroups (ngroups, groups);
+  save_errno = errno; /* don't let free() touch errno */
+  free (groups);
+  errno = save_errno;
+  if (result < 0)
+    SCM_SYSERROR;
+  return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+#endif
+
 #ifdef HAVE_GETPWENT
 SCM_DEFINE (scm_getpwuid, "getpw", 0, 1, 0,
             (SCM user),