Christian Brauner
cc54fb8f73
Add bpf_kernel_has_kfunc() which checks whether the kernel's vmlinux BTF advertises a function of a given name. The three btf__* symbols it needs are optional in the dlopen table. btf__load_vmlinux_btf() only exists since libbpf 0.5 and a libbpf that lacks any of them should degrade this probe, not fail dlopen_bpf() and with it all of BPF. Note, libbpf < 1.0 returns error pointers instead of NULL, so the result is checked with bpf_get_error_translated(). Finding the name doesn't tell us all that much though. It tells us that the function exists, not that it is registered as a kfunc for the program type we care about. So callers still have to be prepared for the program load to fail. Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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