diff options
Diffstat (limited to 'REORG.TODO/sysdeps/mach/hurd/getgroups.c')
-rw-r--r-- | REORG.TODO/sysdeps/mach/hurd/getgroups.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/mach/hurd/getgroups.c b/REORG.TODO/sysdeps/mach/hurd/getgroups.c new file mode 100644 index 0000000000..5141796101 --- /dev/null +++ b/REORG.TODO/sysdeps/mach/hurd/getgroups.c @@ -0,0 +1,69 @@ +/* Copyright (C) 1993-2017 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 <hurd.h> +#include <hurd/id.h> +#include <string.h> + +int +__getgroups (int n, gid_t *gidset) +{ + error_t err; + int ngids; + void *crit; + + if (n < 0) + return __hurd_fail (EINVAL); + + 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) + return __hurd_fail (EINVAL); + memcpy (gidset, gids, ngids * sizeof (gid_t)); + } + else + { + __mutex_unlock (&_hurd_id.lock); + _hurd_critical_section_unlock (crit); + } + + return ngids; +} + +weak_alias (__getgroups, getgroups) |