text: // SPDX-License-Identifier: GPL-2.0
  #include <pthread.h>
  #include <dlfcn.h>
  
  #include "../util/cache.h"
  #include "../util/debug.h"
  #include "../util/hist.h"
  #include "../util/util.h"
  
  pthread_mutex_t ui__lock = PTHREAD_MUTEX_INITIALIZER;
  void *perf_gtk_handle;
  int use_browser = -1;
  
  #define PERF_GTK_DSO "libperf-gtk.so"
  
  #ifdef HAVE_GTK2_SUPPORT
  
  static int setup_gtk_browser(void)
  {
  	int (*perf_ui_init)(void);
  
  	if (perf_gtk_handle)
  		return 0;
  
  	perf_gtk_handle = dlopen(PERF_GTK_DSO, RTLD_LAZY);
  	if (perf_gtk_handle == NULL) {
  		char buf[PATH_MAX];
  		scnprintf(buf, sizeof(buf), "%s/%s", LIBDIR, PERF_GTK_DSO);
  		perf_gtk_handle = dlopen(buf, 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
  
  int stdio__config_color(const struct option *opt __maybe_unused,
  			const char *mode, int unset __maybe_unused)
  {
  	perf_use_color_default = perf_config_colorbool("color.ui", mode, -1);
  	return 0;
  }
  
  void setup_browser(bool fallback_to_pager)
  {
  	if (use_browser < 2 && (!isatty(1) || dump_trace))
  		use_browser = 0;
  
  	/* default to TUI */
  	if (use_browser < 0)
  		use_browser = 1;
  
  	switch (use_browser) {
  	case 2:
  		if (setup_gtk_browser() == 0)
  			break;
  		printf("GTK browser requested but could not find %s\n",
  		       PERF_GTK_DSO);
  		sleep(1);
  		/* fall through */
  	case 1:
  		use_browser = 1;
  		if (ui__init() == 0)
  			break;
  		/* fall through */
  	default:
  		use_browser = 0;
  		if (fallback_to_pager)
  			setup_pager();
  		break;
  	}
  }
  
  void exit_browser(bool wait_for_ok)
  {
  	switch (use_browser) {
  	case 2:
  		exit_gtk_browser(wait_for_ok);
  		break;
  
  	case 1:
  		ui__exit(wait_for_ok);
  		break;
  
  	default:
  		break;
  	}
  }
  