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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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25
src/libbpf.c
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@@ -229,7 +229,30 @@ static const char * const prog_type_name[] = {
static int __base_pr(enum libbpf_print_level level, const char *format,
va_list args)
{
if (level == LIBBPF_DEBUG)
const char *env_var = "LIBBPF_LOG_LEVEL";
static enum libbpf_print_level min_level = LIBBPF_INFO;
static bool initialized;
if (!initialized) {
char *verbosity;
initialized = true;
verbosity = getenv(env_var);
if (verbosity) {
if (strcasecmp(verbosity, "warn") == 0)
min_level = LIBBPF_WARN;
else if (strcasecmp(verbosity, "debug") == 0)
min_level = LIBBPF_DEBUG;
else if (strcasecmp(verbosity, "info") == 0)
min_level = LIBBPF_INFO;
else
fprintf(stderr, "libbpf: unrecognized '%s' envvar value: '%s', should be one of 'warn', 'debug', or 'info'.\n",
env_var, verbosity);
}
}
/* if too verbose, skip logging */
if (level > min_level)
return 0;
return vfprintf(stderr, format, args);