[LTP] [PATCH 3/5] pidfd_getfd.h: add fallback

[Petr Vorel]

Hi Xu,

> Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
> ---
>  configure.ac               |  1 +
>  include/lapi/pidfd_getfd.h | 26 ++++++++++++++++++++++++++
>  2 files changed, 27 insertions(+)
>  create mode 100644 include/lapi/pidfd_getfd.h

> diff --git a/configure.ac b/configure.ac
> index 8d2c5b1c4..49499704e 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -115,6 +115,7 @@ AC_CHECK_FUNCS_ONCE([ \
>      open_tree \
>      openat \
>      openat2 \
> +    pidfd_getfd \
>      pidfd_open \
>      pidfd_send_signal \
>      pkey_mprotect \
> diff --git a/include/lapi/pidfd_getfd.h b/include/lapi/pidfd_getfd.h
> new file mode 100644
> index 000000000..1f488a518
> --- /dev/null
> +++ b/include/lapi/pidfd_getfd.h
> @@ -0,0 +1,26 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2022 FUJITSU LIMITED. All rights reserved.
> + * Author: Yang Xu <xuyang2018.jy@fujitsu.com>
> + */
> +
> +#ifndef LAPI_PIDFD_GETFD_H__
> +#define LAPI_PIDFD_GETFD_H__
> +
> +#include "lapi/syscalls.h"
> +#include "config.h"
nit: IMHO it's better to always put config.h at the first place.

Otherwise LGTM.
Reviewed-by: Petr Vorel <pvorel@suse.cz>

Kind regards,
Petr

> +
> +static inline void pidfd_getfd_supported(void)
> +{
> +	/* allow the tests to fail early */
> +	tst_syscall(__NR_pidfd_getfd);
> +}
> +
> +#ifndef HAVE_PIDFD_GETFD
> +static inline int pidfd_getfd(int pidfd, int targetfd, unsigned int flags)
> +{
> +	return tst_syscall(__NR_pidfd_getfd, pidfd, targetfd, flags);
> +}
> +#endif
> +
> +#endif /* LAPI_PIDFD_GETFD_H__ */