1 files changed, 77 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/setresuid.c b/sysdeps/mach/hurd/setresuid.c
new file mode 100644
index 0000000000..2d05dbc850
--- /dev/null
+++ b/sysdeps/mach/hurd/setresuid.c
@@ -0,0 +1,77 @@
+/* setresuid -- set effective user ID, real user ID, and saved-set user ID
+   Copyright (C) 2002 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <unistd.h>
+#include <hurd.h>
+#include <hurd/id.h>
+
+/* Set the effective user ID, real user ID, and saved-set user ID,
+   of the calling process to EUID, RUID, and SUID, respectively.  */
+int
+__setresuid (uid_t euid, uid_t ruid, uid_t suid)
+{
+  auth_t newauth;
+  error_t err;
+  uid_t auids[2] = { ruid, suid };
+
+  HURD_CRITICAL_BEGIN;
+  __mutex_lock (&_hurd_id.lock);
+  err = _hurd_check_ids ();
+
+  if (!err)
+    {
+      /* Make a new auth handle which has EUID as the first element in the
+         list of effective uids.  */
+
+      if (_hurd_id.gen.nuids > 0)
+	{
+	  _hurd_id.gen.uids[0] = euid;
+	  _hurd_id.valid = 0;
+	}
+      if (_hurd_id.aux.nuids > 1)
+	{
+	  _hurd_id.aux.uids[0] = ruid;
+	  _hurd_id.aux.uids[1] = suid;
+	  _hurd_id.valid = 0;
+	}
+
+      err = __USEPORT (AUTH, __auth_makeauth
+		       (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
+			_hurd_id.gen.nuids ? _hurd_id.gen.uids : &euid,
+			_hurd_id.gen.nuids ?: 1,
+			_hurd_id.aux.nuids > 1 ? _hurd_id.aux.uids : auids,
+			_hurd_id.aux.nuids > 1 ? _hurd_id.aux.nuids : 2,
+			_hurd_id.gen.gids, _hurd_id.gen.ngids,
+			_hurd_id.aux.gids, _hurd_id.aux.ngids,
+			&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;
+}
+libc_hidden_def (__setresuid)