From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- sysdeps/mach/hurd/getgroups.c | 68 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 sysdeps/mach/hurd/getgroups.c (limited to 'sysdeps/mach/hurd/getgroups.c') diff --git a/sysdeps/mach/hurd/getgroups.c b/sysdeps/mach/hurd/getgroups.c new file mode 100644 index 0000000000..d985d29317 --- /dev/null +++ b/sysdeps/mach/hurd/getgroups.c @@ -0,0 +1,68 @@ +/* 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 +#include +#include +#include +#include +#include + +int +__getgroups (int n, gid_t *gidset) +{ + error_t err; + int ngids; + void *crit; + + crit = _hurd_critical_section_lock (); + __mutex_lock (&_hurd_id.lock); + + if (err = _hurd_check_ids ()) + { + __mutex_unlock (&_hurd_id.lock); + _hurd_critical_section_unlock (crit); + return __hurd_fail (err); + } + + ngids = _hurd_id.gen.ngids; + + if (n != 0) + { + /* Copy the gids onto stack storage and then release the idlock. */ + gid_t gids[ngids]; + memcpy (gids, _hurd_id.gen.gids, sizeof (gids)); + __mutex_unlock (&_hurd_id.lock); + _hurd_critical_section_unlock (crit); + + /* Now that the lock is released, we can safely copy the + group set into the user's array, which might fault. */ + if (ngids > n) + ngids = n; + memcpy (gidset, gids, ngids * sizeof (gid_t)); + } + else + { + __mutex_unlock (&_hurd_id.lock); + _hurd_critical_section_unlock (crit); + } + + return ngids; +} + +weak_alias (__getgroups, getgroups) -- cgit 1.4.1