[v1] rseq01: basic test rseq

Add basic check for the newly added glibc API in LTP.
This test references the glibc test case tst-rseq.c.

Signed-off-by: Wei Gao <wegao@suse.com>
---
 runtest/syscalls                          |  2 +
 testcases/kernel/syscalls/rseq/.gitignore |  1 +
 testcases/kernel/syscalls/rseq/Makefile   |  7 +++
 testcases/kernel/syscalls/rseq/rseq01.c   | 74 +++++++++++++++++++++++
 4 files changed, 84 insertions(+)
 create mode 100644 testcases/kernel/syscalls/rseq/.gitignore
 create mode 100644 testcases/kernel/syscalls/rseq/Makefile
 create mode 100644 testcases/kernel/syscalls/rseq/rseq01.c

Hi!
> Add basic check for the newly added glibc API in LTP.
> This test references the glibc test case tst-rseq.c.
> 
> Signed-off-by: Wei Gao <wegao@suse.com>
> ---
>  runtest/syscalls                          |  2 +
>  testcases/kernel/syscalls/rseq/.gitignore |  1 +
>  testcases/kernel/syscalls/rseq/Makefile   |  7 +++
>  testcases/kernel/syscalls/rseq/rseq01.c   | 74 +++++++++++++++++++++++
>  4 files changed, 84 insertions(+)
>  create mode 100644 testcases/kernel/syscalls/rseq/.gitignore
>  create mode 100644 testcases/kernel/syscalls/rseq/Makefile
>  create mode 100644 testcases/kernel/syscalls/rseq/rseq01.c
> 
> diff --git a/runtest/syscalls b/runtest/syscalls
> index ae37a1192..f46950b27 100644
> --- a/runtest/syscalls
> +++ b/runtest/syscalls
> @@ -1752,6 +1752,8 @@ copy_file_range01 copy_file_range01
>  copy_file_range02 copy_file_range02
>  copy_file_range03 copy_file_range03
>  
> +rseq01 rseq01
> +
>  statx01 statx01
>  statx02 statx02
>  statx03 statx03
> diff --git a/testcases/kernel/syscalls/rseq/.gitignore b/testcases/kernel/syscalls/rseq/.gitignore
> new file mode 100644
> index 000000000..8a6c7ee36
> --- /dev/null
> +++ b/testcases/kernel/syscalls/rseq/.gitignore
> @@ -0,0 +1 @@
> +/rseq01
> diff --git a/testcases/kernel/syscalls/rseq/Makefile b/testcases/kernel/syscalls/rseq/Makefile
> new file mode 100644
> index 000000000..159d5651c
> --- /dev/null
> +++ b/testcases/kernel/syscalls/rseq/Makefile
> @@ -0,0 +1,7 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +#  Copyright (C) 2012 Linux Test Project, Inc.
> +
> +top_srcdir		?= ../../../..
> +
> +include $(top_srcdir)/include/mk/testcases.mk
> +include $(top_srcdir)/include/mk/generic_leaf_target.mk
> diff --git a/testcases/kernel/syscalls/rseq/rseq01.c b/testcases/kernel/syscalls/rseq/rseq01.c
> new file mode 100644
> index 000000000..ac096471e
> --- /dev/null
> +++ b/testcases/kernel/syscalls/rseq/rseq01.c
> @@ -0,0 +1,74 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2021-2023 Free Software Foundation, Inc.
> + *
> + * 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/>.

This part that says anything about GNU C Library shouldn't be there, the
copyright itself should be enough to keep the reference where the code
came from.

> + * Restartable Sequences single-threaded tests.
> + * These tests validate that rseq is registered from main in an executable
> + * not linked against libpthread.
> + */

This should be changed into docparse readable description.

> +#define _GNU_SOURCE
> +#include <errno.h>
> +#include <stdio.h>
> +#include <unistd.h>
> +#include "tst_test.h"
> +#include <stdbool.h>
> +
> +#if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 35))
> +# include <sys/rseq.h>
> +#endif
> +
> +#ifdef RSEQ_SIG
> +# include <stdlib.h>
> +# include <string.h>
> +# include <syscall.h>
> +# include <sched.h>
> +
> +static 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);
> +}

Can we please add a configure cehck and a fallback header into a lapi/ ?

LTP runs on different libc implmentations and such ifdefs shouldn't be
used at all.

> +static void check_rseq_available(void)
> +{
> +	int rc;
> +
> +	rc = sys_rseq(NULL, 0, 0, 0);
> +	if (rc != -1)
> +		tst_brk(TFAIL | TTERRNO, "Unexpected rseq return value %d ", rc);
> +	switch (errno) {
> +	case ENOSYS:
> +		tst_res(TCONF,
> +				"kernel does not support rseq, skipping test");
> +	case EINVAL:
> +		/* rseq is implemented, but detected an invalid rseq_len parameter.  */
> +		break;
> +	default:
> +		tst_brk(TFAIL | TTERRNO, "Unexpected rseq error ");
> +	}
> +}
> +
> +static void run(void)
> +{
> +	check_rseq_available();
> +
> +	TST_EXP_PASS(!(sched_getcpu() >= 0));
> +}
> +#else /* RSEQ_SIG */
> +
> +static void run(void)
> +{
> +	tst_res(TCONF,
> +		"glibc does not define RSEQ_SIG, skipping test");
> +}
> +
> +#endif /* RSEQ_SIG */
> +
> +static struct tst_test test = {
> +	.test_all = run,
> +	.needs_root = 1,
> +};
> -- 
> 2.35.3
> 
> 
> -- 
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