linux-kernel - [PATCH 1/1] libbpf: ensure F_DUPFD

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Message-Id: <20220227142551.2349805-1-james.hilliard1@gmail.com>
Date:   Sun, 27 Feb 2022 07:25:51 -0700
From:   James Hilliard <james.hilliard1@...il.com>
To:     bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        James Hilliard <james.hilliard1@...il.com>
Subject: [PATCH 1/1] libbpf: ensure F_DUPFD_CLOEXEC is defined

This definition seems to be missing from some older toolchains.

Note that the fcntl.h in libbpf_internal.h is not a kernel header
but rather a toolchain libc header.

Fixes:
libbpf_internal.h:521:18: error: 'F_DUPFD_CLOEXEC' undeclared (first use in this function); did you mean 'FD_CLOEXEC'?
   fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
                  ^~~~~~~~~~~~~~~
                  FD_CLOEXEC

Signed-off-by: James Hilliard <james.hilliard1@...il.com>
---
 tools/lib/bpf/libbpf_internal.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
index 4fda8bdf0a0d..d2a86b5a457a 100644
--- a/tools/lib/bpf/libbpf_internal.h
+++ b/tools/lib/bpf/libbpf_internal.h
@@ -31,6 +31,10 @@
 #define EM_BPF 247
 #endif
 
+#ifndef F_DUPFD_CLOEXEC
+#define F_DUPFD_CLOEXEC 1030
+#endif
+
 #ifndef R_BPF_64_64
 #define R_BPF_64_64 1
 #endif
-- 
2.25.1