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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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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;
}