diff options
Diffstat (limited to 'sysdeps/mach/hurd/setregid.c')
| -rw-r--r-- | sysdeps/mach/hurd/setregid.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/setregid.c b/sysdeps/mach/hurd/setregid.c new file mode 100644 index 0000000000..8b76f7008a --- /dev/null +++ b/sysdeps/mach/hurd/setregid.c @@ -0,0 +1,71 @@ +/* Copyright (C) 1993, 1994, 1995 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 <sys/types.h> +#include <unistd.h> +#include <hurd.h> +#include <hurd/id.h> +#include <string.h> + +int +__setregid (gid_t rgid, gid_t egid) +{ + 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 RGID as the real gid, + and EGID as the first element in the list of effective gids. */ + + size_t ngen = _hurd_id.gen.ngids < 1 ? 1 : _hurd_id.gen.ngids; + size_t naux = _hurd_id.aux.ngids < 1 ? 1 : _hurd_id.aux.ngids; + gid_t newaux[naux], newgen[ngen]; + + newgen[0] = egid; + memcpy (&newgen[1], _hurd_id.gen.gids, (ngen - 1) * sizeof (gid_t)); + newaux[0] = rgid; + memcpy (&newaux[1], _hurd_id.aux.gids, (naux - 1) * sizeof (gid_t)); + + err = __USEPORT (AUTH, __auth_makeauth + (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0, + _hurd_id.gen.gids, _hurd_id.gen.ngids, + _hurd_id.aux.gids, _hurd_id.aux.ngids, + 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 (__setregid, setregid) |