Add backtrace screen

Co-authored-by: Benny Baumann <[email protected]>
Co-authored-by: Kang-Che Sung <[email protected]>

Action.c

@@ -27,7 +27,9 @@ in the source distribution for its full text.
 #include "ListItem.h"
 #include "Macros.h"
 #include "MainPanel.h"
+#include "Object.h"
 #include "OpenFilesScreen.h"
+#include "Panel.h"
 #include "Process.h"
 #include "ProcessLocksScreen.h"
 #include "ProvideCurses.h"
@@ -47,6 +49,10 @@ in the source distribution for its full text.
 #include "AffinityPanel.h"
 #endif
 
+#if defined(HAVE_BACKTRACE)
+#include "BacktraceScreen.h"
+#endif
+
 
 Object* Action_pickFromVector(State* st, Panel* list, int x, bool follow) {
    MainPanel* mainPanel = st->mainPanel;
@@ -595,6 +601,24 @@ static Htop_Reaction actionShowLocks(State* st) {
    return HTOP_REFRESH | HTOP_REDRAW_BAR;
 }
 
+#if defined(HAVE_BACKTRACE)
+static Htop_Reaction actionBacktrace(State *st) {
+   const Process* process = (Process*) Panel_getSelected((Panel*)st->mainPanel);
+   if (!process)
+      return HTOP_OK;
+
+   BacktracePanel *panel = BacktracePanel_new(process, st->host->settings);
+   ScreenManager *screenManager = ScreenManager_new(NULL, st->host, st, false);
+   ScreenManager_add(screenManager, (Panel *)panel, 0);
+
+   ScreenManager_run(screenManager, NULL, NULL, NULL);
+   BacktracePanel_delete((Object *)panel);
+   ScreenManager_delete(screenManager);
+
+   return HTOP_REFRESH | HTOP_REDRAW_BAR | HTOP_UPDATE_PANELHDR;
+}
+#endif
+
 static Htop_Reaction actionStrace(State* st) {
    if (!Action_writeableProcess(st))
       return HTOP_OK;
@@ -678,6 +702,9 @@ static const struct {
    { .key = "   F8 [: ", .roInactive = true,  .info = "lower priority (+ nice)" },
 #if (defined(HAVE_LIBHWLOC) || defined(HAVE_AFFINITY))
    { .key = "      a: ", .roInactive = true, .info = "set CPU affinity" },
+#endif
+#if defined(HAVE_BACKTRACE)
+   { .key = "      b: ", .roInactive = false, .info = "show process backtrace" },
 #endif
    { .key = "      e: ", .roInactive = false, .info = "show process environment" },
    { .key = "      i: ", .roInactive = true,  .info = "set IO priority" },
@@ -918,6 +945,9 @@ void Action_setBindings(Htop_Action* keys) {
    keys['\\'] = actionIncFilter;
    keys[']'] = actionHigherPriority;
    keys['a'] = actionSetAffinity;
+#if defined(HAVE_BACKTRACE)
+   keys['b'] = actionBacktrace;
+#endif
    keys['c'] = actionTagAllChildren;
    keys['e'] = actionShowEnvScreen;
    keys['h'] = actionHelp;