selftests/bpf: Add tests for u[ret]probe attach by name
add tests that verify attaching by name for 1. local functions in a program 2. library functions in a shared object ...succeed for uprobe and uretprobes using new "func_name" option for bpf_program__attach_uprobe_opts(). Also verify auto-attach works where uprobe, path to binary and function name are specified, but fails with -EOPNOTSUPP with a SEC name that does not specify binary path/function. Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/1648654000-21758-5-git-send-email-alan.maguire@oracle.com
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