linux-kernel - [PATCH 1/1] libbpf: Define MFD

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Date: Thu, 21 Mar 2024 13:01:58 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Andrii Nakryiko <andrii@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>
Cc: bpf@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org
Subject: [PATCH 1/1] libbpf: Define MFD_CLOEXEC if not available

Since its going directly to the syscall to avoid not having
memfd_create() available in some systems, do the same for its
MFD_CLOEXEC flags, defining it if not available.

This fixes the build in those systems, noticed while building perf on a
set of build containers.

Fixes: 9fa5e1a180aa639f ("libbpf: Call memfd_create() syscall directly")
Cc: Andrii Nakryiko <andrii@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/lib/bpf/libbpf.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index efab29b8935bd9f7..635a38c6f947a34d 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -1650,6 +1650,10 @@ static int sys_memfd_create(const char *name, unsigned flags)
 	return syscall(__NR_memfd_create, name, flags);
 }
 
+#ifndef MFD_CLOEXEC
+#define MFD_CLOEXEC 0x0001U
+#endif
+
 static int create_placeholder_fd(void)
 {
 	int fd;
-- 
2.44.0