Adding upstream version 3.3.0.upstream/3.3.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 948 insertions, 0 deletions

diff --git a/Action.c b/Action.c
new file mode 100644
index 0000000..4049a95
--- /dev/null
+++ b/Action.c
@@ -0,0 +1,948 @@
+/*
+htop - Action.c
+(C) 2015 Hisham H. Muhammad
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "config.h" // IWYU pragma: keep
+
+#include "Action.h"
+
+#include <assert.h>
+#include <pwd.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "CRT.h"
+#include "CategoriesPanel.h"
+#include "CommandScreen.h"
+#include "DynamicColumn.h"
+#include "EnvScreen.h"
+#include "FunctionBar.h"
+#include "Hashtable.h"
+#include "IncSet.h"
+#include "InfoScreen.h"
+#include "ListItem.h"
+#include "Macros.h"
+#include "MainPanel.h"
+#include "OpenFilesScreen.h"
+#include "Process.h"
+#include "ProcessLocksScreen.h"
+#include "ProvideCurses.h"
+#include "Row.h"
+#include "RowField.h"
+#include "Scheduling.h"
+#include "ScreenManager.h"
+#include "SignalsPanel.h"
+#include "Table.h"
+#include "TraceScreen.h"
+#include "UsersTable.h"
+#include "Vector.h"
+#include "XUtils.h"
+
+#if (defined(HAVE_LIBHWLOC) || defined(HAVE_AFFINITY))
+#include "Affinity.h"
+#include "AffinityPanel.h"
+#endif
+
+
+Object* Action_pickFromVector(State* st, Panel* list, int x, bool follow) {
+   MainPanel* mainPanel = st->mainPanel;
+   Header* header = st->header;
+   Machine* host = st->host;
+
+   int y = ((Panel*)mainPanel)->y;
+   ScreenManager* scr = ScreenManager_new(header, host, st, false);
+   scr->allowFocusChange = false;
+   ScreenManager_add(scr, list, x);
+   ScreenManager_add(scr, (Panel*)mainPanel, -1);
+   Panel* panelFocus;
+   int ch;
+   bool unfollow = false;
+   int row = follow ? MainPanel_selectedRow(mainPanel) : -1;
+   if (follow && host->activeTable->following == -1) {
+      host->activeTable->following = row;
+      unfollow = true;
+   }
+   ScreenManager_run(scr, &panelFocus, &ch, NULL);
+   if (unfollow) {
+      host->activeTable->following = -1;
+   }
+   ScreenManager_delete(scr);
+   Panel_move((Panel*)mainPanel, 0, y);
+   Panel_resize((Panel*)mainPanel, COLS, LINES - y - 1);
+   if (panelFocus == list && ch == 13) {
+      if (follow) {
+         const Row* selected = (const Row*)Panel_getSelected((Panel*)mainPanel);
+         if (selected && selected->id == row)
+            return Panel_getSelected(list);
+
+         beep();
+      } else {
+         return Panel_getSelected(list);
+      }
+   }
+
+   return NULL;
+}
+
+// ----------------------------------------
+
+static void Action_runSetup(State* st) {
+   const Settings* settings = st->host->settings;
+   ScreenManager* scr = ScreenManager_new(st->header, st->host, st, true);
+   CategoriesPanel_new(scr, st->header, st->host);
+   ScreenManager_run(scr, NULL, NULL, "Setup");
+   ScreenManager_delete(scr);
+   if (settings->changed) {
+      CRT_setMouse(settings->enableMouse);
+      Header_writeBackToSettings(st->header);
+   }
+}
+
+static bool changePriority(MainPanel* panel, int delta) {
+   bool anyTagged;
+   bool ok = MainPanel_foreachRow(panel, Process_rowChangePriorityBy, (Arg) { .i = delta }, &anyTagged);
+   if (!ok)
+      beep();
+   return anyTagged;
+}
+
+static void addUserToVector(ht_key_t key, void* userCast, void* panelCast) {
+   const char* user = userCast;
+   Panel* panel = panelCast;
+   Panel_add(panel, (Object*) ListItem_new(user, key));
+}
+
+bool Action_setUserOnly(const char* userName, uid_t* userId) {
+   const struct passwd* user = getpwnam(userName);
+   if (user) {
+      *userId = user->pw_uid;
+      return true;
+   }
+   *userId = (uid_t)-1;
+   return false;
+}
+
+static void tagAllChildren(Panel* panel, Row* parent) {
+   parent->tag = true;
+   int parent_id = parent->id;
+   for (int i = 0; i < Panel_size(panel); i++) {
+      Row* row = (Row*) Panel_get(panel, i);
+      if (!row->tag && Row_isChildOf(row, parent_id)) {
+         tagAllChildren(panel, row);
+      }
+   }
+}
+
+static bool expandCollapse(Panel* panel) {
+   Row* row = (Row*) Panel_getSelected(panel);
+   if (!row)
+      return false;
+
+   row->showChildren = !row->showChildren;
+   return true;
+}
+
+static bool collapseIntoParent(Panel* panel) {
+   const Row* r = (Row*) Panel_getSelected(panel);
+   if (!r)
+      return false;
+
+   int parent_id = Row_getGroupOrParent(r);
+   for (int i = 0; i < Panel_size(panel); i++) {
+      Row* row = (Row*) Panel_get(panel, i);
+      if (row->id == parent_id) {
+         row->showChildren = false;
+         Panel_setSelected(panel, i);
+         return true;
+      }
+   }
+   return false;
+}
+
+Htop_Reaction Action_setSortKey(Settings* settings, ProcessField sortKey) {
+   ScreenSettings_setSortKey(settings->ss, (RowField) sortKey);
+   return HTOP_REFRESH | HTOP_SAVE_SETTINGS | HTOP_UPDATE_PANELHDR | HTOP_KEEP_FOLLOWING;
+}
+
+// ----------------------------------------
+
+static bool Action_writeableProcess(State* st) {
+   const Settings* settings = st->host->settings;
+   bool readonly = Settings_isReadonly() || settings->ss->dynamic;
+   return !readonly;
+}
+
+static bool Action_readableProcess(State* st) {
+   const Settings* settings = st->host->settings;
+   return !settings->ss->dynamic;
+}
+
+static Htop_Reaction actionSetSortColumn(State* st) {
+   Htop_Reaction reaction = HTOP_OK;
+   Panel* sortPanel = Panel_new(0, 0, 0, 0, Class(ListItem), true, FunctionBar_newEnterEsc("Sort   ", "Cancel "));
+   Panel_setHeader(sortPanel, "Sort by");
+   Machine* host = st->host;
+   Settings* settings = host->settings;
+   const RowField* fields = settings->ss->fields;
+   Hashtable* dynamicColumns = settings->dynamicColumns;
+   for (int i = 0; fields[i]; i++) {
+      char* name = NULL;
+      if (fields[i] >= ROW_DYNAMIC_FIELDS) {
+         DynamicColumn* column = Hashtable_get(dynamicColumns, fields[i]);
+         if (!column)
+            continue;
+         name = xStrdup(column->caption ? column->caption : column->name);
+      } else {
+         name = String_trim(Process_fields[fields[i]].name);
+      }
+      Panel_add(sortPanel, (Object*) ListItem_new(name, fields[i]));
+      if (fields[i] == ScreenSettings_getActiveSortKey(settings->ss))
+         Panel_setSelected(sortPanel, i);
+
+      free(name);
+   }
+   const ListItem* field = (const ListItem*) Action_pickFromVector(st, sortPanel, 14, false);
+   if (field) {
+      reaction |= Action_setSortKey(settings, field->key);
+   }
+   Object_delete(sortPanel);
+
+   host->activeTable->needsSort = true;
+
+   return reaction | HTOP_REFRESH | HTOP_REDRAW_BAR | HTOP_UPDATE_PANELHDR;
+}
+
+static Htop_Reaction actionSortByPID(State* st) {
+   return Action_setSortKey(st->host->settings, PID);
+}
+
+static Htop_Reaction actionSortByMemory(State* st) {
+   return Action_setSortKey(st->host->settings, PERCENT_MEM);
+}
+
+static Htop_Reaction actionSortByCPU(State* st) {
+   return Action_setSortKey(st->host->settings, PERCENT_CPU);
+}
+
+static Htop_Reaction actionSortByTime(State* st) {
+   return Action_setSortKey(st->host->settings, TIME);
+}
+
+static Htop_Reaction actionToggleKernelThreads(State* st) {
+   Settings* settings = st->host->settings;
+   settings->hideKernelThreads = !settings->hideKernelThreads;
+   settings->lastUpdate++;
+
+   Machine_scanTables(st->host); // needed to not have a visible delay showing wrong data
+
+   return HTOP_RECALCULATE | HTOP_SAVE_SETTINGS | HTOP_KEEP_FOLLOWING;
+}
+
+static Htop_Reaction actionToggleUserlandThreads(State* st) {
+   Settings* settings = st->host->settings;
+   settings->hideUserlandThreads = !settings->hideUserlandThreads;
+   settings->lastUpdate++;
+
+   Machine_scanTables(st->host); // needed to not have a visible delay showing wrong data
+
+   return HTOP_RECALCULATE | HTOP_SAVE_SETTINGS | HTOP_KEEP_FOLLOWING;
+}
+
+static Htop_Reaction actionToggleRunningInContainer(State* st) {
+   Settings* settings = st->host->settings;
+   settings->hideRunningInContainer = !settings->hideRunningInContainer;
+   settings->lastUpdate++;
+
+   return HTOP_RECALCULATE | HTOP_SAVE_SETTINGS | HTOP_KEEP_FOLLOWING;
+}
+
+static Htop_Reaction actionToggleProgramPath(State* st) {
+   Settings* settings = st->host->settings;
+   settings->showProgramPath = !settings->showProgramPath;
+   settings->lastUpdate++;
+
+   return HTOP_REFRESH | HTOP_SAVE_SETTINGS | HTOP_KEEP_FOLLOWING;
+}
+
+static Htop_Reaction actionToggleMergedCommand(State* st) {
+   Settings* settings = st->host->settings;
+   settings->showMergedCommand = !settings->showMergedCommand;
+   settings->lastUpdate++;
+
+   return HTOP_REFRESH | HTOP_SAVE_SETTINGS | HTOP_KEEP_FOLLOWING | HTOP_UPDATE_PANELHDR;
+}
+
+static Htop_Reaction actionToggleTreeView(State* st) {
+   Machine* host = st->host;
+   ScreenSettings* ss = host->settings->ss;
+   ss->treeView = !ss->treeView;
+
+   if (!ss->allBranchesCollapsed)
+      Table_expandTree(host->activeTable);
+
+   host->activeTable->needsSort = true;
+
+   return HTOP_REFRESH | HTOP_SAVE_SETTINGS | HTOP_KEEP_FOLLOWING | HTOP_REDRAW_BAR | HTOP_UPDATE_PANELHDR;
+}
+
+static Htop_Reaction actionToggleHideMeters(State* st) {
+   st->hideMeters = !st->hideMeters;
+   return HTOP_RESIZE | HTOP_KEEP_FOLLOWING;
+}
+
+static Htop_Reaction actionExpandOrCollapseAllBranches(State* st) {
+   Machine* host = st->host;
+   ScreenSettings* ss = host->settings->ss;
+   if (!ss->treeView) {
+      return HTOP_OK;
+   }
+   ss->allBranchesCollapsed = !ss->allBranchesCollapsed;
+   if (ss->allBranchesCollapsed)
+      Table_collapseAllBranches(host->activeTable);
+   else
+      Table_expandTree(host->activeTable);
+   return HTOP_REFRESH | HTOP_SAVE_SETTINGS;
+}
+
+static Htop_Reaction actionIncFilter(State* st) {
+   Machine* host = st->host;
+   IncSet* inc = (st->mainPanel)->inc;
+   IncSet_activate(inc, INC_FILTER, (Panel*)st->mainPanel);
+   host->activeTable->incFilter = IncSet_filter(inc);
+   return HTOP_REFRESH | HTOP_KEEP_FOLLOWING;
+}
+
+static Htop_Reaction actionIncSearch(State* st) {
+   IncSet_reset(st->mainPanel->inc, INC_SEARCH);
+   IncSet_activate(st->mainPanel->inc, INC_SEARCH, (Panel*)st->mainPanel);
+   return HTOP_REFRESH | HTOP_KEEP_FOLLOWING;
+}
+
+static Htop_Reaction actionHigherPriority(State* st) {
+   if (!Action_writeableProcess(st))
+      return HTOP_OK;
+
+   bool changed = changePriority(st->mainPanel, -1);
+   return changed ? HTOP_REFRESH : HTOP_OK;
+}
+
+static Htop_Reaction actionLowerPriority(State* st) {
+   if (!Action_writeableProcess(st))
+      return HTOP_OK;
+
+   bool changed = changePriority(st->mainPanel, 1);
+   return changed ? HTOP_REFRESH : HTOP_OK;
+}
+
+static Htop_Reaction actionInvertSortOrder(State* st) {
+   Machine* host = st->host;
+   ScreenSettings_invertSortOrder(host->settings->ss);
+   host->activeTable->needsSort = true;
+   return HTOP_REFRESH | HTOP_SAVE_SETTINGS | HTOP_KEEP_FOLLOWING | HTOP_UPDATE_PANELHDR;
+}
+
+static Htop_Reaction actionExpandOrCollapse(State* st) {
+   if (!st->host->settings->ss->treeView)
+      return HTOP_OK;
+
+   bool changed = expandCollapse((Panel*)st->mainPanel);
+   return changed ? HTOP_RECALCULATE : HTOP_OK;
+}
+
+static Htop_Reaction actionCollapseIntoParent(State* st) {
+   if (!st->host->settings->ss->treeView) {
+      return HTOP_OK;
+   }
+   bool changed = collapseIntoParent((Panel*)st->mainPanel);
+   return changed ? HTOP_RECALCULATE : HTOP_OK;
+}
+
+static Htop_Reaction actionExpandCollapseOrSortColumn(State* st) {
+   return st->host->settings->ss->treeView ? actionExpandOrCollapse(st) : actionSetSortColumn(st);
+}
+
+static inline void setActiveScreen(Settings* settings, State* st, unsigned int ssIdx) {
+   assert(settings->ssIndex == ssIdx);
+   Machine* host = st->host;
+
+   settings->ss = settings->screens[ssIdx];
+   if (!settings->ss->table)
+      settings->ss->table = host->processTable;
+   host->activeTable = settings->ss->table;
+
+   // set correct functionBar - readonly if requested, and/or with non-process screens
+   bool readonly = Settings_isReadonly() || (host->activeTable != host->processTable);
+   MainPanel_setFunctionBar(st->mainPanel, readonly);
+}
+
+static Htop_Reaction actionNextScreen(State* st) {
+   Settings* settings = st->host->settings;
+   settings->ssIndex++;
+   if (settings->ssIndex == settings->nScreens) {
+      settings->ssIndex = 0;
+   }
+   setActiveScreen(settings, st, settings->ssIndex);
+   return HTOP_UPDATE_PANELHDR | HTOP_REFRESH | HTOP_REDRAW_BAR;
+}
+
+static Htop_Reaction actionPrevScreen(State* st) {
+   Settings* settings = st->host->settings;
+   if (settings->ssIndex == 0) {
+      settings->ssIndex = settings->nScreens - 1;
+   } else {
+      settings->ssIndex--;
+   }
+   setActiveScreen(settings, st, settings->ssIndex);
+   return HTOP_UPDATE_PANELHDR | HTOP_REFRESH | HTOP_REDRAW_BAR;
+}
+
+Htop_Reaction Action_setScreenTab(State* st, int x) {
+   Settings* settings = st->host->settings;
+   int s = 2;
+   for (unsigned int i = 0; i < settings->nScreens; i++) {
+      if (x < s) {
+         return 0;
+      }
+      const char* tab = settings->screens[i]->heading;
+      int len = strlen(tab);
+      if (x <= s + len + 1) {
+         settings->ssIndex = i;
+         setActiveScreen(settings, st, i);
+         return HTOP_UPDATE_PANELHDR | HTOP_REFRESH | HTOP_REDRAW_BAR;
+      }
+      s += len + 3;
+   }
+   return 0;
+}
+
+static Htop_Reaction actionQuit(ATTR_UNUSED State* st) {
+   return HTOP_QUIT;
+}
+
+static Htop_Reaction actionSetAffinity(State* st) {
+   if (!Action_writeableProcess(st))
+      return HTOP_OK;
+
+   Machine* host = st->host;
+   if (host->activeCPUs == 1)
+      return HTOP_OK;
+
+#if (defined(HAVE_LIBHWLOC) || defined(HAVE_AFFINITY))
+   const Row* row = (const Row*) Panel_getSelected((Panel*)st->mainPanel);
+   if (!row)
+      return HTOP_OK;
+
+   Affinity* affinity1 = Affinity_rowGet(row, host);
+   if (!affinity1)
+      return HTOP_OK;
+
+   int width;
+   Panel* affinityPanel = AffinityPanel_new(host, affinity1, &width);
+   Affinity_delete(affinity1);
+
+   const void* set = Action_pickFromVector(st, affinityPanel, width, true);
+   if (set) {
+      Affinity* affinity2 = AffinityPanel_getAffinity(affinityPanel, host);
+      bool ok = MainPanel_foreachRow(st->mainPanel, Affinity_rowSet, (Arg) { .v = affinity2 }, NULL);
+      if (!ok)
+         beep();
+      Affinity_delete(affinity2);
+   }
+   Object_delete(affinityPanel);
+   return HTOP_REFRESH | HTOP_REDRAW_BAR | HTOP_UPDATE_PANELHDR;
+#else
+   return HTOP_OK;
+#endif
+}
+
+#ifdef SCHEDULER_SUPPORT
+static Htop_Reaction actionSetSchedPolicy(State* st) {
+   if (!Action_writeableProcess(st))
+      return HTOP_KEEP_FOLLOWING;
+
+   static int preSelectedPolicy = SCHEDULINGPANEL_INITSELECTEDPOLICY;
+   static int preSelectedPriority = SCHEDULINGPANEL_INITSELECTEDPRIORITY;
+
+   Panel* schedPanel = Scheduling_newPolicyPanel(preSelectedPolicy);
+
+   const ListItem* policy;
+   for (;;) {
+      policy = (const ListItem*) Action_pickFromVector(st, schedPanel, 18, true);
+
+      if (!policy || policy->key != -1)
+         break;
+
+      Scheduling_togglePolicyPanelResetOnFork(schedPanel);
+   }
+
+   if (policy) {
+      preSelectedPolicy = policy->key;
+
+      Panel* prioPanel = Scheduling_newPriorityPanel(policy->key, preSelectedPriority);
+      if (prioPanel) {
+         const ListItem* prio = (const ListItem*) Action_pickFromVector(st, prioPanel, 14, true);
+         if (prio)
+            preSelectedPriority = prio->key;
+
+         Panel_delete((Object*) prioPanel);
+      }
+
+      SchedulingArg v = { .policy = preSelectedPolicy, .priority = preSelectedPriority };
+
+      bool ok = MainPanel_foreachRow(st->mainPanel, Scheduling_rowSetPolicy, (Arg) { .v = &v }, NULL);
+      if (!ok)
+         beep();
+   }
+
+   Panel_delete((Object*)schedPanel);
+
+   return HTOP_REFRESH | HTOP_REDRAW_BAR | HTOP_KEEP_FOLLOWING;
+}
+#endif  /* SCHEDULER_SUPPORT */
+
+static Htop_Reaction actionKill(State* st) {
+   if (!Action_writeableProcess(st))
+      return HTOP_OK;
+
+   static int preSelectedSignal = SIGNALSPANEL_INITSELECTEDSIGNAL;
+
+   Panel* signalsPanel = SignalsPanel_new(preSelectedSignal);
+   const ListItem* sgn = (ListItem*) Action_pickFromVector(st, signalsPanel, 14, true);
+   if (sgn && sgn->key != 0) {
+      preSelectedSignal = sgn->key;
+      Panel_setHeader((Panel*)st->mainPanel, "Sending...");
+      Panel_draw((Panel*)st->mainPanel, false, true, true, State_hideFunctionBar(st));
+      refresh();
+      bool ok = MainPanel_foreachRow(st->mainPanel, Process_rowSendSignal, (Arg) { .i = sgn->key }, NULL);
+      if (!ok) {
+         beep();
+      }
+      napms(500);
+   }
+   Panel_delete((Object*)signalsPanel);
+
+   return HTOP_REFRESH | HTOP_REDRAW_BAR | HTOP_UPDATE_PANELHDR;
+}
+
+static Htop_Reaction actionFilterByUser(State* st) {
+   Panel* usersPanel = Panel_new(0, 0, 0, 0, Class(ListItem), true, FunctionBar_newEnterEsc("Show   ", "Cancel "));
+   Panel_setHeader(usersPanel, "Show processes of:");
+   Machine* host = st->host;
+   UsersTable_foreach(host->usersTable, addUserToVector, usersPanel);
+   Vector_insertionSort(usersPanel->items);
+   ListItem* allUsers = ListItem_new("All users", -1);
+   Panel_insert(usersPanel, 0, (Object*) allUsers);
+   const ListItem* picked = (ListItem*) Action_pickFromVector(st, usersPanel, 19, false);
+   if (picked) {
+      if (picked == allUsers) {
+         host->userId = (uid_t)-1;
+      } else {
+         Action_setUserOnly(ListItem_getRef(picked), &host->userId);
+      }
+   }
+   Panel_delete((Object*)usersPanel);
+   return HTOP_REFRESH | HTOP_REDRAW_BAR | HTOP_UPDATE_PANELHDR;
+}
+
+Htop_Reaction Action_follow(State* st) {
+   st->host->activeTable->following = MainPanel_selectedRow(st->mainPanel);
+   Panel_setSelectionColor((Panel*)st->mainPanel, PANEL_SELECTION_FOLLOW);
+   return HTOP_KEEP_FOLLOWING;
+}
+
+static Htop_Reaction actionSetup(State* st) {
+   Action_runSetup(st);
+   return HTOP_REFRESH | HTOP_REDRAW_BAR | HTOP_UPDATE_PANELHDR | HTOP_RESIZE;
+}
+
+static Htop_Reaction actionLsof(State* st) {
+   if (!Action_writeableProcess(st))
+      return HTOP_OK;
+
+   const Process* p = (Process*) Panel_getSelected((Panel*)st->mainPanel);
+   if (!p)
+      return HTOP_OK;
+
+   assert(Object_isA((const Object*) p, (const ObjectClass*) &Process_class));
+
+   OpenFilesScreen* ofs = OpenFilesScreen_new(p);
+   InfoScreen_run((InfoScreen*)ofs);
+   OpenFilesScreen_delete((Object*)ofs);
+   clear();
+   CRT_enableDelay();
+   return HTOP_REFRESH | HTOP_REDRAW_BAR;
+}
+
+static Htop_Reaction actionShowLocks(State* st) {
+   if (!Action_readableProcess(st))
+      return HTOP_OK;
+
+   const Process* p = (Process*) Panel_getSelected((Panel*)st->mainPanel);
+   if (!p)
+      return HTOP_OK;
+
+   assert(Object_isA((const Object*) p, (const ObjectClass*) &Process_class));
+
+   ProcessLocksScreen* pls = ProcessLocksScreen_new(p);
+   InfoScreen_run((InfoScreen*)pls);
+   ProcessLocksScreen_delete((Object*)pls);
+   clear();
+   CRT_enableDelay();
+   return HTOP_REFRESH | HTOP_REDRAW_BAR;
+}
+
+static Htop_Reaction actionStrace(State* st) {
+   if (!Action_writeableProcess(st))
+      return HTOP_OK;
+
+   const Process* p = (Process*) Panel_getSelected((Panel*)st->mainPanel);
+   if (!p)
+      return HTOP_OK;
+
+   assert(Object_isA((const Object*) p, (const ObjectClass*) &Process_class));
+
+   TraceScreen* ts = TraceScreen_new(p);
+   bool ok = TraceScreen_forkTracer(ts);
+   if (ok) {
+      InfoScreen_run((InfoScreen*)ts);
+   }
+   TraceScreen_delete((Object*)ts);
+   clear();
+   CRT_enableDelay();
+   return HTOP_REFRESH | HTOP_REDRAW_BAR;
+}
+
+static Htop_Reaction actionTag(State* st) {
+   Row* r = (Row*) Panel_getSelected((Panel*)st->mainPanel);
+   if (!r)
+      return HTOP_OK;
+
+   Row_toggleTag(r);
+   Panel_onKey((Panel*)st->mainPanel, KEY_DOWN);
+   return HTOP_OK;
+}
+
+static Htop_Reaction actionRedraw(ATTR_UNUSED State* st) {
+   clear();
+   // HTOP_RECALCULATE here to make Ctrl-L also refresh the data and not only redraw
+   return HTOP_RECALCULATE | HTOP_REFRESH | HTOP_REDRAW_BAR;
+}
+
+static Htop_Reaction actionTogglePauseUpdate(State* st) {
+   st->pauseUpdate = !st->pauseUpdate;
+   return HTOP_REFRESH | HTOP_REDRAW_BAR;
+}
+
+static const struct {
+   const char* key;
+   bool roInactive;
+   const char* info;
+} helpLeft[] = {
+   { .key = "      #: ",  .roInactive = false, .info = "hide/show header meters" },
+   { .key = "    Tab: ",  .roInactive = false, .info = "switch to next screen tab" },
+   { .key = " Arrows: ",  .roInactive = false, .info = "scroll process list" },
+   { .key = " Digits: ",  .roInactive = false, .info = "incremental PID search" },
+   { .key = "   F3 /: ",  .roInactive = false, .info = "incremental name search" },
+   { .key = "   F4 \\: ", .roInactive = false, .info = "incremental name filtering" },
+   { .key = "   F5 t: ",  .roInactive = false, .info = "tree view" },
+   { .key = "      p: ",  .roInactive = false, .info = "toggle program path" },
+   { .key = "      m: ",  .roInactive = false, .info = "toggle merged command" },
+   { .key = "      Z: ",  .roInactive = false, .info = "pause/resume process updates" },
+   { .key = "      u: ",  .roInactive = false, .info = "show processes of a single user" },
+   { .key = "      H: ",  .roInactive = false, .info = "hide/show user process threads" },
+   { .key = "      K: ",  .roInactive = false, .info = "hide/show kernel threads" },
+   { .key = "      O: ",  .roInactive = false, .info = "hide/show processes in containers" },
+   { .key = "      F: ",  .roInactive = false, .info = "cursor follows process" },
+   { .key = "  + - *: ",  .roInactive = false, .info = "expand/collapse tree/toggle all" },
+   { .key = "N P M T: ",  .roInactive = false, .info = "sort by PID, CPU%, MEM% or TIME" },
+   { .key = "      I: ",  .roInactive = false, .info = "invert sort order" },
+   { .key = " F6 > .: ",  .roInactive = false, .info = "select sort column" },
+   { .key = NULL, .info = NULL }
+};
+
+static const struct {
+   const char* key;
+   bool roInactive;
+   const char* info;
+} helpRight[] = {
+   { .key = "  S-Tab: ", .roInactive = false, .info = "switch to previous screen tab" },
+   { .key = "  Space: ", .roInactive = false, .info = "tag process" },
+   { .key = "      c: ", .roInactive = false, .info = "tag process and its children" },
+   { .key = "      U: ", .roInactive = false, .info = "untag all processes" },
+   { .key = "   F9 k: ", .roInactive = true,  .info = "kill process/tagged processes" },
+   { .key = "   F7 ]: ", .roInactive = true,  .info = "higher priority (root only)" },
+   { .key = "   F8 [: ", .roInactive = true,  .info = "lower priority (+ nice)" },
+#if (defined(HAVE_LIBHWLOC) || defined(HAVE_AFFINITY))
+   { .key = "      a: ", .roInactive = true, .info = "set CPU affinity" },
+#endif
+   { .key = "      e: ", .roInactive = false, .info = "show process environment" },
+   { .key = "      i: ", .roInactive = true,  .info = "set IO priority" },
+   { .key = "      l: ", .roInactive = true,  .info = "list open files with lsof" },
+   { .key = "      x: ", .roInactive = false, .info = "list file locks of process" },
+   { .key = "      s: ", .roInactive = true,  .info = "trace syscalls with strace" },
+   { .key = "      w: ", .roInactive = false, .info = "wrap process command in multiple lines" },
+#ifdef SCHEDULER_SUPPORT
+   { .key = "      Y: ", .roInactive = true,  .info = "set scheduling policy" },
+#endif
+   { .key = " F2 C S: ", .roInactive = false, .info = "setup" },
+   { .key = " F1 h ?: ", .roInactive = false, .info = "show this help screen" },
+   { .key = "  F10 q: ", .roInactive = false, .info = "quit" },
+   { .key = NULL, .info = NULL }
+};
+
+static inline void addattrstr( int attr, const char* str) {
+   attrset(attr);
+   addstr(str);
+}
+
+static Htop_Reaction actionHelp(State* st) {
+   clear();
+   attrset(CRT_colors[HELP_BOLD]);
+
+   for (int i = 0; i < LINES - 1; i++)
+      mvhline(i, 0, ' ', COLS);
+
+   int line = 0;
+
+   mvaddstr(line++, 0, "htop " VERSION " - " COPYRIGHT);
+   mvaddstr(line++, 0, "Released under the GNU GPLv2+. See 'man' page for more info.");
+
+   attrset(CRT_colors[DEFAULT_COLOR]);
+   line++;
+   mvaddstr(line++, 0, "CPU usage bar: ");
+
+#define addbartext(attr, prefix, text)               \
+   do {                                              \
+      addattrstr(CRT_colors[DEFAULT_COLOR], prefix); \
+      addattrstr(attr, text);                        \
+   } while(0)
+
+   addattrstr(CRT_colors[BAR_BORDER], "[");
+   addbartext(CRT_colors[CPU_NICE_TEXT], "", "low");
+   addbartext(CRT_colors[CPU_NORMAL], "/", "normal");
+   addbartext(CRT_colors[CPU_SYSTEM], "/", "kernel");
+   if (st->host->settings->detailedCPUTime) {
+      addbartext(CRT_colors[CPU_IRQ], "/", "irq");
+      addbartext(CRT_colors[CPU_SOFTIRQ], "/", "soft-irq");
+      addbartext(CRT_colors[CPU_STEAL], "/", "steal");
+      addbartext(CRT_colors[CPU_GUEST], "/", "guest");
+      addbartext(CRT_colors[CPU_IOWAIT], "/", "io-wait");
+      addbartext(CRT_colors[BAR_SHADOW], " ", "used%");
+   } else {
+      addbartext(CRT_colors[CPU_GUEST], "/", "guest");
+      addbartext(CRT_colors[BAR_SHADOW], "                  ", "used%");
+   }
+   addattrstr(CRT_colors[BAR_BORDER], "]");
+
+   attrset(CRT_colors[DEFAULT_COLOR]);
+   mvaddstr(line++, 0, "Memory bar:    ");
+   addattrstr(CRT_colors[BAR_BORDER], "[");
+   addbartext(CRT_colors[MEMORY_USED], "", "used");
+   addbartext(CRT_colors[MEMORY_SHARED], "/", "shared");
+   addbartext(CRT_colors[MEMORY_COMPRESSED], "/", "compressed");
+   addbartext(CRT_colors[MEMORY_BUFFERS_TEXT], "/", "buffers");
+   addbartext(CRT_colors[MEMORY_CACHE], "/", "cache");
+   addbartext(CRT_colors[BAR_SHADOW], "          ", "used");
+   addbartext(CRT_colors[BAR_SHADOW], "/", "total");
+   addattrstr(CRT_colors[BAR_BORDER], "]");
+
+   attrset(CRT_colors[DEFAULT_COLOR]);
+   mvaddstr(line++, 0, "Swap bar:      ");
+   addattrstr(CRT_colors[BAR_BORDER], "[");
+   addbartext(CRT_colors[SWAP], "", "used");
+#ifdef HTOP_LINUX
+   addbartext(CRT_colors[SWAP_CACHE], "/", "cache");
+   addbartext(CRT_colors[SWAP_FRONTSWAP], "/", "frontswap");
+#else
+   addbartext(CRT_colors[SWAP_CACHE], "      ", "");
+#endif
+   addbartext(CRT_colors[BAR_SHADOW], "                          ", "used");
+   addbartext(CRT_colors[BAR_SHADOW], "/", "total");
+   addattrstr(CRT_colors[BAR_BORDER], "]");
+
+   line++;
+
+#undef addbartext
+
+   attrset(CRT_colors[DEFAULT_COLOR]);
+   mvaddstr(line++, 0, "Type and layout of header meters are configurable in the setup screen.");
+   if (CRT_colorScheme == COLORSCHEME_MONOCHROME) {
+      mvaddstr(line, 0, "In monochrome, meters display as different chars, in order: |#*@$%&.");
+   }
+   line++;
+
+#define addattrstatestr(attr, state, desc)              \
+   do {                                                 \
+      addattrstr(attr, state);                          \
+      addattrstr(CRT_colors[DEFAULT_COLOR], ": " desc); \
+   } while(0)
+
+   mvaddstr(line, 0, "Process state: ");
+   addattrstatestr(CRT_colors[PROCESS_RUN_STATE], "R", "running; ");
+   addattrstatestr(CRT_colors[PROCESS_SHADOW], "S", "sleeping; ");
+   addattrstatestr(CRT_colors[PROCESS_RUN_STATE], "t", "traced/stopped; ");
+   addattrstatestr(CRT_colors[PROCESS_D_STATE], "Z", "zombie; ");
+   addattrstatestr(CRT_colors[PROCESS_D_STATE], "D", "disk sleep");
+   attrset(CRT_colors[DEFAULT_COLOR]);
+
+#undef addattrstatestr
+
+   line += 2;
+
+   const bool readonly = Settings_isReadonly();
+
+   int item;
+   for (item = 0; helpLeft[item].key; item++) {
+      attrset((helpLeft[item].roInactive && readonly) ? CRT_colors[HELP_SHADOW] : CRT_colors[DEFAULT_COLOR]);
+      mvaddstr(line + item, 10, helpLeft[item].info);
+      attrset((helpLeft[item].roInactive && readonly) ? CRT_colors[HELP_SHADOW] : CRT_colors[HELP_BOLD]);
+      mvaddstr(line + item, 1,  helpLeft[item].key);
+      if (String_eq(helpLeft[item].key, "      H: ")) {
+         attrset((helpLeft[item].roInactive && readonly) ? CRT_colors[HELP_SHADOW] : CRT_colors[PROCESS_THREAD]);
+         mvaddstr(line + item, 33, "threads");
+      } else if (String_eq(helpLeft[item].key, "      K: ")) {
+         attrset((helpLeft[item].roInactive && readonly) ? CRT_colors[HELP_SHADOW] : CRT_colors[PROCESS_THREAD]);
+         mvaddstr(line + item, 27, "threads");
+      }
+   }
+   int leftHelpItems = item;
+
+   for (item = 0; helpRight[item].key; item++) {
+      attrset((helpRight[item].roInactive && readonly) ? CRT_colors[HELP_SHADOW] : CRT_colors[HELP_BOLD]);
+      mvaddstr(line + item, 43, helpRight[item].key);
+      attrset((helpRight[item].roInactive && readonly) ? CRT_colors[HELP_SHADOW] : CRT_colors[DEFAULT_COLOR]);
+      mvaddstr(line + item, 52, helpRight[item].info);
+   }
+   line += MAXIMUM(leftHelpItems, item);
+   line++;
+
+   attrset(CRT_colors[HELP_BOLD]);
+   mvaddstr(line++, 0, "Press any key to return.");
+   attrset(CRT_colors[DEFAULT_COLOR]);
+   refresh();
+   CRT_readKey();
+   clear();
+
+   return HTOP_RECALCULATE | HTOP_REDRAW_BAR | HTOP_KEEP_FOLLOWING;
+}
+
+static Htop_Reaction actionUntagAll(State* st) {
+   for (int i = 0; i < Panel_size((Panel*)st->mainPanel); i++) {
+      Row* row = (Row*) Panel_get((Panel*)st->mainPanel, i);
+      row->tag = false;
+   }
+   return HTOP_REFRESH;
+}
+
+static Htop_Reaction actionTagAllChildren(State* st) {
+   Row* row = (Row*) Panel_getSelected((Panel*)st->mainPanel);
+   if (!row)
+      return HTOP_OK;
+
+   tagAllChildren((Panel*)st->mainPanel, row);
+   return HTOP_OK;
+}
+
+static Htop_Reaction actionShowEnvScreen(State* st) {
+   if (!Action_readableProcess(st))
+      return HTOP_OK;
+
+   Process* p = (Process*) Panel_getSelected((Panel*)st->mainPanel);
+   if (!p)
+      return HTOP_OK;
+
+   assert(Object_isA((const Object*) p, (const ObjectClass*) &Process_class));
+
+   EnvScreen* es = EnvScreen_new(p);
+   InfoScreen_run((InfoScreen*)es);
+   EnvScreen_delete((Object*)es);
+   clear();
+   CRT_enableDelay();
+   return HTOP_REFRESH | HTOP_REDRAW_BAR;
+}
+
+static Htop_Reaction actionShowCommandScreen(State* st) {
+   if (!Action_readableProcess(st))
+      return HTOP_OK;
+
+   Process* p = (Process*) Panel_getSelected((Panel*)st->mainPanel);
+   if (!p)
+      return HTOP_OK;
+
+   assert(Object_isA((const Object*) p, (const ObjectClass*) &Process_class));
+
+   CommandScreen* cmdScr = CommandScreen_new(p);
+   InfoScreen_run((InfoScreen*)cmdScr);
+   CommandScreen_delete((Object*)cmdScr);
+   clear();
+   CRT_enableDelay();
+   return HTOP_REFRESH | HTOP_REDRAW_BAR;
+}
+
+void Action_setBindings(Htop_Action* keys) {
+   keys[' '] = actionTag;
+   keys['#'] = actionToggleHideMeters;
+   keys['*'] = actionExpandOrCollapseAllBranches;
+   keys['+'] = actionExpandOrCollapse;
+   keys[','] = actionSetSortColumn;
+   keys['-'] = actionExpandOrCollapse;
+   keys['.'] = actionSetSortColumn;
+   keys['/'] = actionIncSearch;
+   keys['<'] = actionSetSortColumn;
+   keys['='] = actionExpandOrCollapse;
+   keys['>'] = actionSetSortColumn;
+   keys['?'] = actionHelp;
+   keys['C'] = actionSetup;
+   keys['F'] = Action_follow;
+   keys['H'] = actionToggleUserlandThreads;
+   keys['I'] = actionInvertSortOrder;
+   keys['K'] = actionToggleKernelThreads;
+   keys['M'] = actionSortByMemory;
+   keys['N'] = actionSortByPID;
+   keys['O'] = actionToggleRunningInContainer;
+   keys['P'] = actionSortByCPU;
+   keys['S'] = actionSetup;
+   keys['T'] = actionSortByTime;
+   keys['U'] = actionUntagAll;
+#ifdef SCHEDULER_SUPPORT
+   keys['Y'] = actionSetSchedPolicy;
+#endif
+   keys['Z'] = actionTogglePauseUpdate;
+   keys['['] = actionLowerPriority;
+   keys['\014'] = actionRedraw; // Ctrl+L
+   keys['\177'] = actionCollapseIntoParent;
+   keys['\\'] = actionIncFilter;
+   keys[']'] = actionHigherPriority;
+   keys['a'] = actionSetAffinity;
+   keys['c'] = actionTagAllChildren;
+   keys['e'] = actionShowEnvScreen;
+   keys['h'] = actionHelp;
+   keys['k'] = actionKill;
+   keys['l'] = actionLsof;
+   keys['m'] = actionToggleMergedCommand;
+   keys['p'] = actionToggleProgramPath;
+   keys['q'] = actionQuit;
+   keys['s'] = actionStrace;
+   keys['t'] = actionToggleTreeView;
+   keys['u'] = actionFilterByUser;
+   keys['w'] = actionShowCommandScreen;
+   keys['x'] = actionShowLocks;
+   keys[KEY_F(1)] = actionHelp;
+   keys[KEY_F(2)] = actionSetup;
+   keys[KEY_F(3)] = actionIncSearch;
+   keys[KEY_F(4)] = actionIncFilter;
+   keys[KEY_F(5)] = actionToggleTreeView;
+   keys[KEY_F(6)] = actionSetSortColumn;
+   keys[KEY_F(7)] = actionHigherPriority;
+   keys[KEY_F(8)] = actionLowerPriority;
+   keys[KEY_F(9)] = actionKill;
+   keys[KEY_F(10)] = actionQuit;
+   keys[KEY_F(18)] = actionExpandCollapseOrSortColumn;
+   keys[KEY_RECLICK] = actionExpandOrCollapse;
+   keys[KEY_SHIFT_TAB] = actionPrevScreen;
+   keys['\t'] = actionNextScreen;
+}