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libbpf: Add _GNU_SOURCE for reallocarray to ringbuf.c

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On systems with recent enough glibc, reallocarray compat won't kick in, so
reallocarray() itself has to come from stdlib.h include. But _GNU_SOURCE is
necessary to enable it. So add it.

Fixes: bf99c936f9 ("libbpf: Add BPF ring buffer support")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200601202601.2139477-1-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-06-01 13:26:01 -07:00 committed by Alexei Starovoitov
parent 958a3f2d2a
commit febeb6dff7
1 changed files with 3 additions and 0 deletions
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3
tools/lib/bpf/ringbuf.c
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@ -4,6 +4,9 @@
*
* Copyright (C) 2020 Facebook, Inc.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>