libbpf: auto-resolve programs/libraries when necessary for uprobes
bpf_program__attach_uprobe_opts() requires a binary_path argument specifying binary to instrument. Supporting simply specifying "libc.so.6" or "foo" should be possible too. Library search checks LD_LIBRARY_PATH, then /usr/lib64, /usr/lib. This allows users to run BPF programs prefixed with LD_LIBRARY_PATH=/path2/lib while still searching standard locations. Similarly for non .so files, we check PATH and /usr/bin, /usr/sbin. Path determination will be useful for auto-attach of BPF uprobe programs using SEC() definition. Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/1648654000-21758-2-git-send-email-alan.maguire@oracle.com
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