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libbpf: Configure log verbosity with env variable

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Configure logging verbosity by setting LIBBPF_LOG_LEVEL environment
variable, which is applied only to default logger. Once user set their
custom logging callback, it is up to them to handle filtering.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240524131840.114289-1-yatsenko@meta.com
This commit is contained in:
Mykyta Yatsenko
2024-05-24 14:18:40 +01:00
committed by Andrii Nakryiko
parent 0babfb126a
commit d4d3e68e8d
3 changed files with 36 additions and 2 deletions
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src/libbpf.h
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@@ -98,7 +98,10 @@ typedef int (*libbpf_print_fn_t)(enum libbpf_print_level level,
/**
* @brief **libbpf_set_print()** sets user-provided log callback function to
* be used for libbpf warnings and informational messages.
* be used for libbpf warnings and informational messages. If the user callback
* is not set, messages are logged to stderr by default. The verbosity of these
* messages can be controlled by setting the environment variable
* LIBBPF_LOG_LEVEL to either warn, info, or debug.
* @param fn The log print function. If NULL, libbpf won't print anything.
* @return Pointer to old print function.
*