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tools lib api: Add debug output support

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Adding support for warning/info/debug output within libapi code. Adding
following macros:

  pr_warning(fmt, ...)
  pr_info(fmt, ...)
  pr_debug(fmt, ...)

Also adding libapi_set_print function to set above functions. This will
be used in perf to set standard debug handlers for libapi.

Adding 2 header files:
  debug.h
    - to be used outside libapi, contains
      libapi_set_print interface

  debug-internal.h
    - to be used within libapi, contains
      pr_warning/pr_info/pr_debug definitions

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1455465826-8426-2-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2016-02-14 17:03:42 +01:00 committed by Arnaldo Carvalho de Melo
parent d646ae0a73
commit 975f14fa8f
5 changed files with 60 additions and 0 deletions
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1
tools/lib/api/Build
View file

@ -1,3 +1,4 @@
libapi-y += fd/
libapi-y += fs/
libapi-y += cpu.o
libapi-y += debug.o

1
tools/lib/api/Makefile
View file

@ -18,6 +18,7 @@ LIBFILE = $(OUTPUT)libapi.a
CFLAGS := $(EXTRA_WARNINGS) $(EXTRA_CFLAGS)
CFLAGS += -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fPIC
CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
CFLAGS += -I$(srctree)/tools/lib/api
RM = rm -f

20
tools/lib/api/debug-internal.h Normal file
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@ -0,0 +1,20 @@
#ifndef __API_DEBUG_INTERNAL_H__
#define __API_DEBUG_INTERNAL_H__
#include "debug.h"
#define __pr(func, fmt, ...) \
do { \
if ((func)) \
(func)("libapi: " fmt, ##__VA_ARGS__); \
} while (0)
extern libapi_print_fn_t __pr_warning;
extern libapi_print_fn_t __pr_info;
extern libapi_print_fn_t __pr_debug;
#define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__)
#define pr_info(fmt, ...) __pr(__pr_info, fmt, ##__VA_ARGS__)
#define pr_debug(fmt, ...) __pr(__pr_debug, fmt, ##__VA_ARGS__)
#endif /* __API_DEBUG_INTERNAL_H__ */

28
tools/lib/api/debug.c Normal file
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@ -0,0 +1,28 @@
#include <stdio.h>
#include <stdarg.h>
#include "debug.h"
#include "debug-internal.h"
static int __base_pr(const char *format, ...)
{
va_list args;
int err;
va_start(args, format);
err = vfprintf(stderr, format, args);
va_end(args);
return err;
}
libapi_print_fn_t __pr_warning = __base_pr;
libapi_print_fn_t __pr_info = __base_pr;
libapi_print_fn_t __pr_debug;
void libapi_set_print(libapi_print_fn_t warn,
libapi_print_fn_t info,
libapi_print_fn_t debug)
{
__pr_warning = warn;
__pr_info = info;
__pr_debug = debug;
}

10
tools/lib/api/debug.h Normal file
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@ -0,0 +1,10 @@
#ifndef __API_DEBUG_H__
#define __API_DEBUG_H__
typedef int (*libapi_print_fn_t)(const char *, ...);
void libapi_set_print(libapi_print_fn_t warn,
libapi_print_fn_t info,
libapi_print_fn_t debug);
#endif /* __API_DEBUG_H__ */