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These tests validate that rseq is registered from various execution contexts (main thread, destructor, other threads, other threads created from destructor, forked process (without exec), pthread_atfork handlers, pthread setspecific destructors, signal handlers, atexit handlers). tst-rseq.c only links against libc.so, testing registration of rseq in a non-multithreaded environment. tst-rseq-nptl.c also links against libpthread.so, testing registration of rseq in a multithreaded environment. See the Linux kernel selftests for extensive rseq stress-tests.
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/* Restartable Sequences tests header.
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Copyright (C) 2020 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <error.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <support/check.h>
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#include <syscall.h>
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#include <sys/rseq.h>
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static inline bool
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rseq_thread_registered (void)
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{
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int32_t v;
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__atomic_load (&__rseq_abi.cpu_id, &v, __ATOMIC_RELAXED);
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return v >= 0;
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}
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static inline int
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sys_rseq (struct rseq *rseq_abi, uint32_t rseq_len, int flags, uint32_t sig)
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{
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return syscall (__NR_rseq, rseq_abi, rseq_len, flags, sig);
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}
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static inline bool
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rseq_available (void)
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{
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int rc;
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rc = sys_rseq (NULL, 0, 0, 0);
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if (rc != -1)
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FAIL_EXIT1 ("Unexpected rseq return value %d", rc);
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switch (errno)
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{
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case ENOSYS:
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return false;
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case EINVAL:
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/* rseq is implemented, but detected an invalid rseq_len parameter. */
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return true;
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default:
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FAIL_EXIT1 ("Unexpected rseq error %s", strerror (errno));
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}
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}
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