getdents: Fix build under glibc 2.30

glibc commit b8b3d5a14e ("Linux: Move getdents64 to <dirent.h>")
moved the declaration from <unistd.h> to <dirent.h> to match the
location of the declaration in musl.

Thus we need to include both <dirent.h> and <unistd.h> for getdents64().

Using getdents64() declaration requires on both glibc and musl
_GNU_SOURCE definition, thus move it to to getdents.h.

Fixes: 587
Reported-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
Hi,

you might not like moving _GNU_SOURCE definition to the header, I can
add the missing one in getdents01.c instead.

Travis: https://travis-ci.org/pevik/ltp/builds/595021543

Kind regards,
Petr

 testcases/kernel/syscalls/getdents/getdents.h   | 2 ++
 testcases/kernel/syscalls/getdents/getdents01.c | 3 ++-
 testcases/kernel/syscalls/getdents/getdents02.c | 4 ++--
 3 files changed, 6 insertions(+), 3 deletions(-)

Hi!
> glibc commit b8b3d5a14e ("Linux: Move getdents64 to <dirent.h>")
> moved the declaration from <unistd.h> to <dirent.h> to match the
> location of the declaration in musl.
> 
> Thus we need to include both <dirent.h> and <unistd.h> for getdents64().
> 
> Using getdents64() declaration requires on both glibc and musl
> _GNU_SOURCE definition, thus move it to to getdents.h.

I would rather go for _GNU_SOURCE being defined in the testcases rather
than hiding it in the getdenst.h header and depending on the order.

Other than that it's fine.

> Fixes: 587
> Reported-by: Cyril Hrubis <chrubis@suse.cz>
> Signed-off-by: Petr Vorel <pvorel@suse.cz>
> ---
> Hi,
> 
> you might not like moving _GNU_SOURCE definition to the header, I can
> add the missing one in getdents01.c instead.
> 
> Travis: https://travis-ci.org/pevik/ltp/builds/595021543
> 
> Kind regards,
> Petr
> 
>  testcases/kernel/syscalls/getdents/getdents.h   | 2 ++
>  testcases/kernel/syscalls/getdents/getdents01.c | 3 ++-
>  testcases/kernel/syscalls/getdents/getdents02.c | 4 ++--
>  3 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/testcases/kernel/syscalls/getdents/getdents.h b/testcases/kernel/syscalls/getdents/getdents.h
> index c24ed6c99..e43dacc15 100644
> --- a/testcases/kernel/syscalls/getdents/getdents.h
> +++ b/testcases/kernel/syscalls/getdents/getdents.h
> @@ -20,6 +20,7 @@
>  #ifndef GETDENTS_H
>  #define GETDENTS_H
>  
> +#define _GNU_SOURCE
>  #include <stdint.h>
>  #include "test.h"
>  #include "lapi/syscalls.h"
> @@ -54,6 +55,7 @@ struct linux_dirent64 {
>  };
>  
>  #if HAVE_GETDENTS64
> +#include <dirent.h>
>  #include <unistd.h>
>  #else
>  static inline int
> diff --git a/testcases/kernel/syscalls/getdents/getdents01.c b/testcases/kernel/syscalls/getdents/getdents01.c
> index 3962d960b..17a58731d 100644
> --- a/testcases/kernel/syscalls/getdents/getdents01.c
> +++ b/testcases/kernel/syscalls/getdents/getdents01.c
> @@ -19,6 +19,8 @@
>   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
>   */
>  
> +#include "getdents.h"
> +
>  #include <stdio.h>
>  #include <errno.h>
>  #include <sys/types.h>
> @@ -27,7 +29,6 @@
>  
>  #include "test.h"
>  #include "safe_macros.h"
> -#include "getdents.h"
>  
>  static void cleanup(void);
>  static void setup(void);
> diff --git a/testcases/kernel/syscalls/getdents/getdents02.c b/testcases/kernel/syscalls/getdents/getdents02.c
> index 7b023c53f..c45812241 100644
> --- a/testcases/kernel/syscalls/getdents/getdents02.c
> +++ b/testcases/kernel/syscalls/getdents/getdents02.c
> @@ -33,7 +33,8 @@
>   *
>   */
>  
> -#define _GNU_SOURCE
> +#include "getdents.h"
> +
>  #include <stdio.h>
>  #include <errno.h>
>  #include <sys/types.h>
> @@ -41,7 +42,6 @@
>  #include <fcntl.h>
>  
>  #include "test.h"
> -#include "getdents.h"
>  #include "safe_macros.h"
>  
>  #define DIR_MODE	(S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP| \
> -- 
> 2.23.0
>

Hi Cyril,

> > glibc commit b8b3d5a14e ("Linux: Move getdents64 to <dirent.h>")
> > moved the declaration from <unistd.h> to <dirent.h> to match the
> > location of the declaration in musl.

> > Thus we need to include both <dirent.h> and <unistd.h> for getdents64().

> > Using getdents64() declaration requires on both glibc and musl
> > _GNU_SOURCE definition, thus move it to to getdents.h.

> I would rather go for _GNU_SOURCE being defined in the testcases rather
> than hiding it in the getdenst.h header and depending on the order.

> Other than that it's fine.

Make sense. Thanks for a review, merged with this change.

Kind regards,
Petr