| 1 | /* Restartable Sequences tests header. |
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| 2 | Copyright (C) 2021-2024 Free Software Foundation, Inc. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <errno.h> |
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| 19 | #include <error.h> |
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| 20 | #include <stdbool.h> |
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| 21 | #include <stdint.h> |
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| 22 | #include <support/check.h> |
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| 23 | #include <syscall.h> |
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| 24 | #include <sys/rseq.h> |
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| 25 | #include <tls.h> |
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| 26 | |
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| 27 | static inline bool |
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| 28 | rseq_thread_registered (void) |
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| 29 | { |
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| 30 | return THREAD_GETMEM_VOLATILE (THREAD_SELF, rseq_area.cpu_id) >= 0; |
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| 31 | } |
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| 32 | |
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| 33 | static inline int |
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| 34 | sys_rseq (struct rseq *rseq_abi, uint32_t rseq_len, int flags, uint32_t sig) |
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| 35 | { |
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| 36 | return syscall (__NR_rseq, rseq_abi, rseq_len, flags, sig); |
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| 37 | } |
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| 38 | |
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| 39 | static inline bool |
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| 40 | rseq_available (void) |
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| 41 | { |
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| 42 | int rc; |
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| 43 | |
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| 44 | rc = sys_rseq (NULL, rseq_len: 0, flags: 0, sig: 0); |
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| 45 | if (rc != -1) |
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| 46 | FAIL_EXIT1 ("Unexpected rseq return value %d" , rc); |
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| 47 | switch (errno) |
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| 48 | { |
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| 49 | case ENOSYS: |
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| 50 | return false; |
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| 51 | case EINVAL: |
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| 52 | /* rseq is implemented, but detected an invalid rseq_len parameter. */ |
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| 53 | return true; |
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| 54 | default: |
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| 55 | FAIL_EXIT1 ("Unexpected rseq error %s" , strerror (errno)); |
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| 56 | } |
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| 57 | } |
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| 58 | |
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