1/* Copyright (C) 2003-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If
17 not, see <https://www.gnu.org/licenses/>. */
18
19#include <shlib-compat.h>
20#include "compat-timer.h"
21#include <atomic.h>
22
23
24#define timer_create_alias __timer_create_new
25#include <sysdeps/unix/sysv/linux/timer_create.c>
26
27#undef timer_create
28versioned_symbol (librt, __timer_create_new, timer_create, GLIBC_2_3_3);
29
30
31#if SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_3_3)
32timer_t __compat_timer_list[OLD_TIMER_MAX] attribute_hidden;
33
34
35int
36__timer_create_old (clockid_t clock_id, struct sigevent *evp, int *timerid)
37{
38 timer_t newp;
39
40 int res = __timer_create_new (clock_id, evp, &newp);
41 if (res == 0)
42 {
43 int i;
44 for (i = 0; i < OLD_TIMER_MAX; ++i)
45 if (__compat_timer_list[i] == NULL
46 && ! atomic_compare_and_exchange_bool_acq (&__compat_timer_list[i],
47 newp, NULL))
48 {
49 *timerid = i;
50 break;
51 }
52
53 if (__glibc_unlikely (i == OLD_TIMER_MAX))
54 {
55 /* No free slot. */
56 (void) __timer_delete_new (newp);
57 __set_errno (EINVAL);
58 res = -1;
59 }
60 }
61
62 return res;
63}
64compat_symbol (librt, __timer_create_old, timer_create, GLIBC_2_2);
65#endif
66