Andrii Nakryiko e87fd8bae4 libbpf: return previous print callback from libbpf_set_print ...

By returning previously set print callback from libbpf_set_print, it's
possible to restore it, eventually. This is useful when running many
independent test with one default print function, but overriding log
verbosity for particular subset of tests.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

2019-07-27 22:36:19 -07:00

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