'e' displays environment of current process

- uses sysctl(KERN_PROCARGS2) on *BSD
- doesn't work on Linux yet

Action.c

@@ -12,6 +12,7 @@ in the source distribution for its full text.
 #include "AffinityPanel.h"
 #include "CategoriesPanel.h"
 #include "CRT.h"
+#include "EnvScreen.h"
 #include "MainPanel.h"
 #include "OpenFilesScreen.h"
 #include "Process.h"
@@ -404,6 +405,7 @@ static struct { const char* key; const char* info; } helpRight[] = {
 #if (HAVE_LIBHWLOC || HAVE_NATIVE_AFFINITY)
    { .key = "      a: ", .info = "set CPU affinity" },
 #endif
+   { .key = "      e: ", .info = "show process environment" },
    { .key = "      i: ", .info = "set IO prority" },
    { .key = "      l: ", .info = "list open files with lsof" },
    { .key = "      s: ", .info = "trace syscalls with strace" },
@@ -499,6 +501,18 @@ static Htop_Reaction actionTagAllChildren(State* st) {
    return HTOP_OK;
 }
 
+static Htop_Reaction actionShowEnvScreen(State* st) {
+   Process* p = (Process*) Panel_getSelected(st->panel);
+   if (!p) return HTOP_OK;
+   EnvScreen* ts = EnvScreen_new(p);
+   EnvScreen_run(ts);
+   EnvScreen_delete(ts);
+   clear();
+   CRT_enableDelay();
+   return HTOP_REFRESH | HTOP_REDRAW_BAR;
+}
+
+
 void Action_setBindings(Htop_Action* keys) {
    keys[KEY_RESIZE] = actionResize;
    keys['M'] = actionSortByMemory;
@@ -548,5 +562,6 @@ void Action_setBindings(Htop_Action* keys) {
    keys['?'] = actionHelp;
    keys['U'] = actionUntagAll;
    keys['c'] = actionTagAllChildren;
+   keys['e'] = actionShowEnvScreen;
 }
 

Action.h

@@ -49,6 +49,7 @@ Htop_Reaction Action_setSortKey(Settings* settings, ProcessField sortKey);
 
 // ----------------------------------------
 
+
 void Action_setBindings(Htop_Action* keys);
 
 

EnvScreen.c

@@ -0,0 +1,196 @@
+#include "EnvScreen.h"
+
+#include "CRT.h"
+#include "IncSet.h"
+#include "ListItem.h"
+#include "StringUtils.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <sys/sysctl.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+/*{
+#include "ProcessList.h"
+#include "Panel.h"
+#include "FunctionBar.h"
+
+typedef struct EnvScreen_ {
+   Process* process;
+   Panel* display;
+   FunctionBar* bar;
+} EnvScreen;
+}*/
+
+static const char* EnvScreenFunctions[] = {"Search ", "Filter ", "Refresh", "Done   ", NULL};
+
+static const char* EnvScreenKeys[] = {"F3", "F4", "F5", "Esc"};
+
+static int EnvScreenEvents[] = {KEY_F(3), KEY_F(4), KEY_F(5), 27};
+
+EnvScreen* EnvScreen_new(Process* process) {
+   EnvScreen* this = malloc(sizeof(EnvScreen));
+   this->process = process;
+   FunctionBar* bar = FunctionBar_new(EnvScreenFunctions, EnvScreenKeys, EnvScreenEvents);
+   this->display = Panel_new(0, 1, COLS, LINES-3, false, Class(ListItem), bar);
+   return this;
+}
+
+void EnvScreen_delete(EnvScreen* this) {
+   Panel_delete((Object*)this->display);
+   free(this);
+}
+
+static void EnvScreen_draw(EnvScreen* this, IncSet* inc) {
+   attrset(CRT_colors[METER_TEXT]);
+   mvhline(0, 0, ' ', COLS);
+   mvprintw(0, 0, "environment of process %d - %s", this->process->pid, this->process->comm);
+   attrset(CRT_colors[DEFAULT_COLOR]);
+   Panel_draw(this->display, true);
+   IncSet_drawBar(inc);
+}
+
+static inline void addLine(const char* line, Vector* lines, Panel* panel, const char* incFilter) {
+   Vector_add(lines, (Object*) ListItem_new(line, 0));
+   if (!incFilter || String_contains_i(line, incFilter))
+      Panel_add(panel, (Object*)Vector_get(lines, Vector_size(lines)-1));
+}
+
+static void EnvScreen_scan(EnvScreen* this, Vector* lines, IncSet* inc) {
+   Panel* panel = this->display;
+   int idx = MAX(Panel_getSelectedIndex(panel), 0);
+   uid_t uid = getuid();
+
+   Panel_prune(panel);
+
+   if (uid == 0 || uid == this->process->st_uid) {
+       long argmax = sysconf(_SC_ARG_MAX);
+       char* buf = malloc(argmax);
+       size_t bufsz = argmax;
+       if (buf) {
+           int mib[3];
+           mib[0] = CTL_KERN;
+           mib[1] = KERN_PROCARGS2;
+           mib[2] = this->process->pid;
+           bufsz = argmax;
+           if (sysctl(mib, 3, buf, &bufsz, 0, 0) == 0) {
+               if (bufsz > sizeof(int)) {
+                   char *p = buf, *endp = buf + bufsz;
+                   int argc = *(int*)p;
+                   p += sizeof(int);
+
+                   // skip exe
+                   p = strchr(p, 0)+1;
+
+                   // skip padding
+                   while(!*p && p < endp)
+                       ++p;
+
+                   // skip argv
+                   for (; argc-- && p < endp; p = strrchr(p, 0)+1)
+                       ;
+
+                   // skip padding
+                   while(!*p && p < endp)
+                       ++p;
+
+                   for (; *p && p < endp; p = strrchr(p, 0)+1)
+                       addLine(p, lines, panel, IncSet_filter(inc));
+               }
+               else {
+                   addLine("Could not allocate memory.", lines, panel, IncSet_filter(inc));
+               }
+           }
+           else {
+               addLine("sysctl(KERN_PROCARGS2) failed.", lines, panel, IncSet_filter(inc));
+           }
+           free(buf);
+       }
+       else {
+           addLine("Out of memory.", lines, panel, IncSet_filter(inc));
+       }
+   }
+   else {
+       addLine("Process belongs to different user.", lines, panel, IncSet_filter(inc));
+   }
+
+   Vector_insertionSort(lines);
+   Vector_insertionSort(panel->items);
+   Panel_setSelected(panel, idx);
+}
+
+void EnvScreen_run(EnvScreen* this) {
+   Panel* panel = this->display;
+   Panel_setHeader(panel, " ");
+
+   FunctionBar* bar = panel->defaultBar;
+   IncSet* inc = IncSet_new(bar);
+
+   Vector* lines = Vector_new(panel->items->type, true, DEFAULT_SIZE);
+
+   EnvScreen_scan(this, lines, inc);
+   EnvScreen_draw(this, inc);
+
+   bool looping = true;
+   while (looping) {
+
+      Panel_draw(panel, true);
+
+      if (inc->active)
+         move(LINES-1, CRT_cursorX);
+      int ch = getch();
+
+      if (ch == KEY_MOUSE) {
+         MEVENT mevent;
+         int ok = getmouse(&mevent);
+         if (ok == OK)
+            if (mevent.y >= panel->y && mevent.y < LINES - 1) {
+               Panel_setSelected(panel, mevent.y - panel->y + panel->scrollV);
+               ch = 0;
+            } if (mevent.y == LINES - 1)
+               ch = IncSet_synthesizeEvent(inc, mevent.x);
+      }
+
+      if (inc->active) {
+         IncSet_handleKey(inc, ch, panel, IncSet_getListItemValue, lines);
+         continue;
+      }
+
+      switch(ch) {
+      case ERR:
+         continue;
+      case KEY_F(3):
+      case '/':
+         IncSet_activate(inc, INC_SEARCH, panel);
+         break;
+      case KEY_F(4):
+      case '\\':
+         IncSet_activate(inc, INC_FILTER, panel);
+         break;
+      case KEY_F(5):
+         clear();
+         EnvScreen_scan(this, lines, inc);
+         EnvScreen_draw(this, inc);
+         break;
+      case '\014': // Ctrl+L
+         clear();
+         EnvScreen_draw(this, inc);
+         break;
+      case 'q':
+      case 27:
+      case KEY_F(10):
+         looping = false;
+         break;
+      case KEY_RESIZE:
+         Panel_resize(panel, COLS, LINES-2);
+         EnvScreen_draw(this, inc);
+         break;
+      default:
+         Panel_onKey(panel, ch);
+      }
+   }
+
+   Vector_delete(lines);
+   IncSet_delete(inc);
+}

EnvScreen.h

@@ -0,0 +1,22 @@
+/* Do not edit this file. It was automatically generated. */
+
+#ifndef HEADER_EnvScreen
+#define HEADER_EnvScreen
+
+#include "ProcessList.h"
+#include "Panel.h"
+#include "FunctionBar.h"
+
+typedef struct EnvScreen_ {
+   Process* process;
+   Panel* display;
+   FunctionBar* bar;
+} EnvScreen;
+
+EnvScreen* EnvScreen_new(Process* process);
+
+void EnvScreen_delete(EnvScreen* this);
+
+void EnvScreen_run(EnvScreen* this);
+
+#endif

Makefile.am

@@ -23,7 +23,7 @@ LoadAverageMeter.c MemoryMeter.c Meter.c MetersPanel.c Object.c Panel.c \
 BatteryMeter.c Process.c ProcessList.c RichString.c ScreenManager.c Settings.c \
 SignalsPanel.c StringUtils.c SwapMeter.c TasksMeter.c UptimeMeter.c \
 TraceScreen.c UsersTable.c Vector.c AvailableColumnsPanel.c AffinityPanel.c \
-HostnameMeter.c OpenFilesScreen.c Affinity.c IncSet.c Action.c
+HostnameMeter.c OpenFilesScreen.c Affinity.c IncSet.c Action.c EnvScreen.c
 
 myhtopheaders = AvailableColumnsPanel.h AvailableMetersPanel.h \
 CategoriesPanel.h CheckItem.h ClockMeter.h ColorsPanel.h ColumnsPanel.h \
@@ -32,7 +32,8 @@ Hashtable.h Header.h htop.h ListItem.h LoadAverageMeter.h MemoryMeter.h \
 BatteryMeter.h Meter.h MetersPanel.h Object.h Panel.h ProcessList.h RichString.h \
 ScreenManager.h Settings.h SignalsPanel.h StringUtils.h SwapMeter.h \
 TasksMeter.h UptimeMeter.h TraceScreen.h UsersTable.h Vector.h Process.h \
-AffinityPanel.h HostnameMeter.h OpenFilesScreen.h Affinity.h IncSet.h Action.h
+AffinityPanel.h HostnameMeter.h OpenFilesScreen.h Affinity.h IncSet.h Action.h \
+EnvScreen.h
 
 if HTOP_LINUX
 htop_CFLAGS += -rdynamic 

Process.h

@@ -158,6 +158,8 @@ typedef struct ProcessClass_ {
 #define ONE_DECIMAL_M (ONE_DECIMAL_K * ONE_DECIMAL_K)
 #define ONE_DECIMAL_G (ONE_DECIMAL_M * ONE_DECIMAL_K)
 
+extern char Process_pidFormat[20];
+
 void Process_setupColumnWidths();
 
 void Process_humanNumber(RichString* str, unsigned long number, bool coloring);