1 files changed, 94 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/mach/hurd/setgid.c b/REORG.TODO/sysdeps/mach/hurd/setgid.c
new file mode 100644
index 0000000000..2311571c23
--- /dev/null
+++ b/REORG.TODO/sysdeps/mach/hurd/setgid.c
@@ -0,0 +1,94 @@
+/* Copyright (C) 1991-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <hurd.h>
+#include <hurd/id.h>
+#include <string.h>
+
+/* Set the group ID of the calling process to UID.
+   If the calling process is the super-user, the real
+   and effective group IDs, and the saved set-group-ID to UID;
+   if not, the effective group ID is set to GID.  */
+int
+__setgid (gid_t gid)
+{
+  auth_t newauth;
+  error_t err;
+
+  HURD_CRITICAL_BEGIN;
+  __mutex_lock (&_hurd_id.lock);
+  err = _hurd_check_ids ();
+
+  if (!err)
+    {
+      /* Make a new auth handle which has GID as the real gid,
+	 and as the first element in the list of effective gids.  */
+
+      gid_t *newgen, *newaux, auxbuf[2];
+      size_t ngen, naux;
+
+      if (_hurd_id.gen.ngids == 0)
+	{
+	  /* No effective gids now.  The new set will be just GID.  */
+	  newgen = &gid;
+	  ngen = 1;
+	}
+      else
+	{
+	  _hurd_id.gen.gids[0] = gid;
+	  _hurd_id.valid = 0;
+	  newgen = _hurd_id.gen.gids;
+	  ngen = _hurd_id.gen.ngids;
+	}
+
+      newaux = _hurd_id.aux.gids;
+      naux = _hurd_id.aux.ngids;
+      if (_hurd_id.gen.nuids > 0 && _hurd_id.gen.uids[0] == 0)
+	{
+	  /* We are root; set the real and saved IDs too.  */
+	  _hurd_id.valid = 0;
+	  if (_hurd_id.aux.ngids < 2)
+	    {
+	      newaux = auxbuf;
+	      naux = 2;
+	    }
+	  newaux[0] = newaux[1] = gid;
+	}
+
+      err = __USEPORT (AUTH, __auth_makeauth
+		       (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
+			_hurd_id.gen.uids, _hurd_id.gen.nuids,
+			_hurd_id.aux.uids, _hurd_id.aux.nuids,
+			newgen, ngen, newaux, naux,
+			&newauth));
+    }
+  __mutex_unlock (&_hurd_id.lock);
+  HURD_CRITICAL_END;
+
+  if (err)
+    return __hurd_fail (err);
+
+  /* Install the new handle and reauthenticate everything.  */
+  err = __setauth (newauth);
+  __mach_port_deallocate (__mach_task_self (), newauth);
+  return err;
+}
+
+weak_alias (__setgid, setgid)