Feature fix libbpf examples

[hp77-creator]

Adding example to run a sample ebpf program which uses a map and updates a value in the map.

[yunwei37]

I think it might be better to rename the example to map-op?

And, can you try loading a eBPF program and running it in the kernel?

[hp77-creator]

sure @yunwei37

[yunwei37]

Hi @hp77-creator , is it ready to merge?

[hp77-creator]

Hi @yunwei37 , so I am able to compile the example but when I try to run it using LD_PRELOAD, I am getting following error:

LD_PRELOAD=~/.bpftime/libbpftime-syscall-ser
ver.dylib ./main
fish: Unknown command. './main' exists but is not an executable file.
LD_PRELOAD=~/.bpftime/libbpftime-syscall-server.dylib ./main

I will need to create a userspace program to run it, right?

[yunwei37]

maybe you need to try something like DYLD_INSERT_LIBRARIES or DYLD_LIBRARY_PATH?

I'm not quite sure about that