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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/mach/hurd/setegid.c
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initial import
Diffstat (limited to 'sysdeps/mach/hurd/setegid.c')
-rw-r--r--sysdeps/mach/hurd/setegid.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/setegid.c b/sysdeps/mach/hurd/setegid.c
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index 0000000000..8ca4abee06
--- /dev/null
+++ b/sysdeps/mach/hurd/setegid.c
@@ -0,0 +1,67 @@
+/* Copyright (C) 1993, 1994 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <hurd.h>
+#include <sys/types.h>
+#include <hurd/id.h>
+#include <string.h>
+
+/* Set the effective user ID of the calling process to GID. */
+int
+DEFUN(setegid, (gid), 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 EGID as the first element in the
+ list of effective gids. */
+
+ size_t ngen = _hurd_id.gen.ngids < 1 ? 1 : _hurd_id.gen.ngids;
+ gid_t newgen[ngen];
+
+ newgen[0] = gid;
+ memcpy (&newgen[1], _hurd_id.gen.gids, (ngen - 1) * sizeof (gid_t));
+
+ 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,
+ _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;
+}