[PATCH 1/8] perf tools: Add debug_set_file function

[Jiri Olsa <jolsa@kernel.org>]

Allow to set debug output file via new debug_set_file function.

It's called during perf startup in perf_debug_setup to set stderr
file as default and any perf command can set it later to different
file.

It will be used in perf daemon command to get verbose output into
log file.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/debug.c | 9 ++++++++-
 tools/perf/util/debug.h | 2 ++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c
index 5cda5565777a..50fd6a4be4e0 100644
--- a/tools/perf/util/debug.c
+++ b/tools/perf/util/debug.c
@@ -30,6 +30,12 @@ bool dump_trace = false, quiet = false;
 int debug_ordered_events;
 static int redirect_to_stderr;
 int debug_data_convert;
+static FILE *debug_file;
+
+void debug_set_file(FILE *file)
+{
+	debug_file = file;
+}
 
 int veprintf(int level, int var, const char *fmt, va_list args)
 {
@@ -39,7 +45,7 @@ int veprintf(int level, int var, const char *fmt, va_list args)
 		if (use_browser >= 1 && !redirect_to_stderr)
 			ui_helpline__vshow(fmt, args);
 		else
-			ret = vfprintf(stderr, fmt, args);
+			ret = vfprintf(debug_file, fmt, args);
 	}
 
 	return ret;
@@ -227,6 +233,7 @@ DEBUG_WRAPPER(debug, 1);
 
 void perf_debug_setup(void)
 {
+	debug_set_file(stderr);
 	libapi_set_print(pr_warning_wrapper, pr_warning_wrapper, pr_debug_wrapper);
 }
 
diff --git a/tools/perf/util/debug.h b/tools/perf/util/debug.h
index f1734abd98dd..43f712295645 100644
--- a/tools/perf/util/debug.h
+++ b/tools/perf/util/debug.h
@@ -5,6 +5,7 @@
 
 #include <stdarg.h>
 #include <stdbool.h>
+#include <stdio.h>
 #include <linux/compiler.h>
 
 extern int verbose;
@@ -62,6 +63,7 @@ int eprintf_time(int level, int var, u64 t, const char *fmt, ...) __printf(4, 5)
 int veprintf(int level, int var, const char *fmt, va_list args);
 
 int perf_debug_option(const char *str);
+void debug_set_file(FILE *file);
 void perf_debug_setup(void);
 int perf_quiet_option(void);
 
-- 
2.26.2