libbpf: Add getter for program size
This adds a new getter for the BPF program size (in bytes). This is useful for a caller that is trying to predict how much memory will be locked by loading a BPF object into the kernel. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/157333185272.88376.10996937115395724683.stgit@toke.dk
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