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/* Restartable Sequences tests header.
Copyright (C) 2021-2025 Free Software Foundation, Inc.
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 <errno.h>
#include <error.h>
#include <stdbool.h>
#include <stdint.h>
#include <support/check.h>
#include <syscall.h>
#include <sys/rseq.h>
#include <tls.h>
#include <rseq-internal.h>
static inline bool
rseq_thread_registered (void)
{
return RSEQ_GETMEM_ONCE (cpu_id) >= 0;
}
static inline int
sys_rseq (struct rseq *rseq_abi, uint32_t rseq_len, int flags, uint32_t sig)
{
return syscall (__NR_rseq, rseq_abi, rseq_len, flags, sig);
}
static inline bool
rseq_available (void)
{
int rc;
rc = sys_rseq (NULL, 0, 0, 0);
if (rc != -1)
FAIL_EXIT1 ("Unexpected rseq return value %d", rc);
switch (errno)
{
case ENOSYS:
return false;
case EINVAL:
/* rseq is implemented, but detected an invalid rseq_len parameter. */
return true;
default:
FAIL_EXIT1 ("Unexpected rseq error %s", strerror (errno));
}
}
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