[PATCH 4/5] perf tools: Setup GTK browser dynamically

[Namhyung Kim <namhyung@kernel.org>]

Call setup/exit GTK browser function using libdl.

Cc: Andi Kleen <ak@linux.intel.com>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/ui/gtk/gtk.h |    3 +++
 tools/perf/ui/setup.c   |   51 +++++++++++++++++++++++++++++++++++++++++++++--
 tools/perf/ui/ui.h      |   12 +----------
 3 files changed, 53 insertions(+), 13 deletions(-)

diff --git a/tools/perf/ui/gtk/gtk.h b/tools/perf/ui/gtk/gtk.h
index 856320e2cc05..8ed6a1288969 100644
--- a/tools/perf/ui/gtk/gtk.h
+++ b/tools/perf/ui/gtk/gtk.h
@@ -19,6 +19,9 @@ struct perf_gtk_context {
 	guint statbar_ctx_id;
 };
 
+int perf_gtk__init(void);
+void perf_gtk__exit(bool wait_for_ok);
+
 extern struct perf_gtk_context *pgctx;
 
 static inline bool perf_gtk__is_active_context(struct perf_gtk_context *ctx)
diff --git a/tools/perf/ui/setup.c b/tools/perf/ui/setup.c
index ebb4cc107876..731c3e4c8156 100644
--- a/tools/perf/ui/setup.c
+++ b/tools/perf/ui/setup.c
@@ -1,4 +1,5 @@
 #include <pthread.h>
+#include <dlfcn.h>
 
 #include "../util/cache.h"
 #include "../util/debug.h"
@@ -6,6 +7,52 @@
 
 pthread_mutex_t ui__lock = PTHREAD_MUTEX_INITIALIZER;
 
+#ifdef GTK2_SUPPORT
+void *perf_gtk_handle;
+
+static int setup_gtk_browser(void)
+{
+	int (*perf_ui_init)(void);
+
+	perf_gtk_handle = dlopen("libperf-gtk.so", RTLD_LAZY);
+	if (perf_gtk_handle == NULL)
+		return -1;
+
+	perf_ui_init = dlsym(perf_gtk_handle, "perf_gtk__init");
+	if (perf_ui_init == NULL)
+		goto out_close;
+
+	if (perf_ui_init() == 0)
+		return 0;
+
+out_close:
+	dlclose(perf_gtk_handle);
+	return -1;
+}
+
+static void exit_gtk_browser(bool wait_for_ok)
+{
+	void (*perf_ui_exit)(bool);
+
+	if (perf_gtk_handle == NULL)
+		return;
+
+	perf_ui_exit = dlsym(perf_gtk_handle, "perf_gtk__exit");
+	if (perf_ui_exit == NULL)
+		goto out_close;
+
+	perf_ui_exit(wait_for_ok);
+
+out_close:
+	dlclose(perf_gtk_handle);
+
+	perf_gtk_handle = NULL;
+}
+#else
+static inline int setup_gtk_browser(void) { return -1; }
+static inline void exit_gtk_browser(bool wait_for_ok __maybe_unused) {}
+#endif
+
 void setup_browser(bool fallback_to_pager)
 {
 	if (!isatty(1) || dump_trace)
@@ -17,7 +64,7 @@ void setup_browser(bool fallback_to_pager)
 
 	switch (use_browser) {
 	case 2:
-		if (perf_gtk__init() == 0)
+		if (setup_gtk_browser() == 0)
 			break;
 		/* fall through */
 	case 1:
@@ -39,7 +86,7 @@ void exit_browser(bool wait_for_ok)
 {
 	switch (use_browser) {
 	case 2:
-		perf_gtk__exit(wait_for_ok);
+		exit_gtk_browser(wait_for_ok);
 		break;
 
 	case 1:
diff --git a/tools/perf/ui/ui.h b/tools/perf/ui/ui.h
index d86359c99907..0e5e0c01a3ee 100644
--- a/tools/perf/ui/ui.h
+++ b/tools/perf/ui/ui.h
@@ -6,6 +6,7 @@
 #include <linux/compiler.h>
 
 extern pthread_mutex_t ui__lock;
+extern void *perf_gtk_handle;
 
 extern int use_browser;
 
@@ -23,17 +24,6 @@ static inline int ui__init(void)
 static inline void ui__exit(bool wait_for_ok __maybe_unused) {}
 #endif
 
-#ifdef GTK2_SUPPORT
-int perf_gtk__init(void);
-void perf_gtk__exit(bool wait_for_ok);
-#else
-static inline int perf_gtk__init(void)
-{
-	return -1;
-}
-static inline void perf_gtk__exit(bool wait_for_ok __maybe_unused) {}
-#endif
-
 void ui__refresh_dimensions(bool force);
 
 #endif /* _PERF_UI_H_ */
-- 
1.7.9.2