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95e114a0 | 1 | /* Restartable Sequences tests header. |
6d7e8eda | 2 | Copyright (C) 2021-2023 Free Software Foundation, Inc. |
95e114a0 FW |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, see | |
16 | <https://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <errno.h> | |
19 | #include <error.h> | |
20 | #include <stdbool.h> | |
21 | #include <stdint.h> | |
22 | #include <support/check.h> | |
23 | #include <syscall.h> | |
24 | #include <sys/rseq.h> | |
25 | #include <tls.h> | |
26 | ||
27 | static inline bool | |
28 | rseq_thread_registered (void) | |
29 | { | |
30 | return THREAD_GETMEM_VOLATILE (THREAD_SELF, rseq_area.cpu_id) >= 0; | |
31 | } | |
32 | ||
33 | static inline int | |
34 | sys_rseq (struct rseq *rseq_abi, uint32_t rseq_len, int flags, uint32_t sig) | |
35 | { | |
36 | return syscall (__NR_rseq, rseq_abi, rseq_len, flags, sig); | |
37 | } | |
38 | ||
39 | static inline bool | |
40 | rseq_available (void) | |
41 | { | |
42 | int rc; | |
43 | ||
44 | rc = sys_rseq (NULL, 0, 0, 0); | |
45 | if (rc != -1) | |
46 | FAIL_EXIT1 ("Unexpected rseq return value %d", rc); | |
47 | switch (errno) | |
48 | { | |
49 | case ENOSYS: | |
50 | return false; | |
51 | case EINVAL: | |
52 | /* rseq is implemented, but detected an invalid rseq_len parameter. */ | |
53 | return true; | |
54 | default: | |
55 | FAIL_EXIT1 ("Unexpected rseq error %s", strerror (errno)); | |
56 | } | |
57 | } |