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

[xuyang2018.jy@fujitsu.com]

Hi Petr
> 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.

Will do.

Best Regards
Yang Xu
>
> 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__ */