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/* Copyright (C) 1993-2022 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
<https://www.gnu.org/licenses/>. */
#include <hurd.h>
#include <hurd/id.h>
#include <string.h>
int
geteuids (int n, uid_t *uidset)
{
error_t err;
int nuids;
void *crit;
retry:
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);
if (err == EINTR)
/* Got a signal while inside an RPC of the critical section, retry again */
goto retry;
return __hurd_fail (err);
}
nuids = _hurd_id.gen.nuids;
if (n != 0)
{
/* Copy the uids onto stack storage and then release the idlock. */
uid_t uids[nuids];
memcpy (uids, _hurd_id.gen.uids, sizeof (uids));
__mutex_unlock (&_hurd_id.lock);
_hurd_critical_section_unlock (crit);
/* Now that the lock is released, we can safely copy the
uid set into the user's array, which might fault. */
if (nuids > n)
nuids = n;
memcpy (uidset, uids, nuids * sizeof (uid_t));
}
else
{
__mutex_unlock (&_hurd_id.lock);
_hurd_critical_section_unlock (crit);
}
return nuids;
}
/* XXX Remove this alias when we bump the libc soname. */
#ifdef SHARED
weak_alias (geteuids, __getuids)
#endif
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