libperf: Add debug output support

Add the perf_set_print() function to allow setting an output function
for warn/info/debug messages.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190721112506.12306-28-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2019-07-21 13:24:14 +02:00 committed by Arnaldo Carvalho de Melo
parent 5b7f445d68
commit a1556f8479
4 changed files with 67 additions and 0 deletions

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@ -0,0 +1,34 @@
// SPDX-License-Identifier: GPL-2.0-only
#define __printf(a, b) __attribute__((format(printf, a, b)))
#include <stdio.h>
#include <stdarg.h>
#include <perf/core.h>
#include "internal.h"
static int __base_pr(enum libperf_print_level level, const char *format,
va_list args)
{
return vfprintf(stderr, format, args);
}
static libperf_print_fn_t __libperf_pr = __base_pr;
void libperf_set_print(libperf_print_fn_t fn)
{
__libperf_pr = fn;
}
__printf(2, 3)
void libperf_print(enum libperf_print_level level, const char *format, ...)
{
va_list args;
if (!__libperf_pr)
return;
va_start(args, format);
__libperf_pr(level, format, args);
va_end(args);
}

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@ -2,8 +2,21 @@
#ifndef __LIBPERF_CORE_H
#define __LIBPERF_CORE_H
#include <stdarg.h>
#ifndef LIBPERF_API
#define LIBPERF_API __attribute__((visibility("default")))
#endif
enum libperf_print_level {
LIBPERF_WARN,
LIBPERF_INFO,
LIBPERF_DEBUG,
};
typedef int (*libperf_print_fn_t)(enum libperf_print_level level,
const char *, va_list ap);
LIBPERF_API void libperf_set_print(libperf_print_fn_t fn);
#endif /* __LIBPERF_CORE_H */

18
tools/perf/lib/internal.h Normal file
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@ -0,0 +1,18 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LIBPERF_INTERNAL_H
#define __LIBPERF_INTERNAL_H
void libperf_print(enum libperf_print_level level,
const char *format, ...)
__attribute__((format(printf, 2, 3)));
#define __pr(level, fmt, ...) \
do { \
libperf_print(level, "libperf: " fmt, ##__VA_ARGS__); \
} while (0)
#define pr_warning(fmt, ...) __pr(LIBPERF_WARN, fmt, ##__VA_ARGS__)
#define pr_info(fmt, ...) __pr(LIBPERF_INFO, fmt, ##__VA_ARGS__)
#define pr_debug(fmt, ...) __pr(LIBPERF_DEBUG, fmt, ##__VA_ARGS__)
#endif /* __LIBPERF_INTERNAL_H */

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@ -1,4 +1,6 @@
LIBPERF_0.0.1 {
global:
libperf_set_print;
local:
*;
};