Add Platform_getProcessEnv

- currently implemented for darwin and linux

EnvScreen.c

 #include "EnvScreen.h"
 
+#include "config.h"
 #include "CRT.h"
 #include "IncSet.h"
 #include "ListItem.h"
+#include "Platform.h"
 #include "StringUtils.h"
 
 #include <stdlib.h>
 #include <string.h>
-#include <sys/sysctl.h>
-#include <sys/types.h>
 #include <unistd.h>
 
 /*{
@@ -65,50 +65,14 @@ static void EnvScreen_scan(EnvScreen* this, Vector* lines, IncSet* inc) {
    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)
+      char *env = Platform_getProcessEnv(this->process->pid);
+      if (env) {
+         for (char *p = env; *p; p = strrchr(p, 0)+1)
             addLine(p, lines, panel, IncSet_filter(inc));
+         free(env);
       }
       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));
+         addLine("Could not read process environment.", lines, panel, IncSet_filter(inc));
       }
    }
    else {

darwin/Platform.c

@@ -236,3 +236,56 @@ void Platform_setSwapValues(Meter* mtr) {
   mtr->total = swapused.xsu_total / 1024;
   mtr->values[0] = swapused.xsu_used / 1024;
 }
+
+char* Platform_getProcessEnv(pid_t pid) {
+   char* env = NULL;
+
+   int argmax;
+   size_t bufsz = sizeof(argmax);
+
+   int mib[3];
+   mib[0] = CTL_KERN;
+   mib[1] = KERN_ARGMAX;
+   if (sysctl(mib, 2, &argmax, &bufsz, 0, 0) == 0) {
+      char* buf = malloc(argmax);
+      if (buf) {
+         mib[0] = CTL_KERN;
+         mib[1] = KERN_PROCARGS2;
+         mib[2] = pid;
+         size_t 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;
+
+               size_t size = endp - p;
+               env = malloc(size+2);
+               if (env) {
+                  memcpy(env, p, size);
+                  env[size] = 0;
+                  env[size+1] = 0;
+               }
+            }
+         }
+         free(buf);
+      }
+   }
+
+   return env;
+}

darwin/Platform.h

@@ -44,4 +44,6 @@ void Platform_setMemoryValues(Meter* mtr);
 
 void Platform_setSwapValues(Meter* mtr);
 
+char* Platform_getProcessEnv(pid_t pid);
+
 #endif

freebsd/Platform.c

@@ -157,3 +157,8 @@ void Platform_setSwapValues(Meter* this) {
 void Platform_setTasksValues(Meter* this) {
    // TODO
 }
+
+char* Platform_getProcessEnv(pid_t pid) {
+   // TODO
+   return NULL;
+}

linux/Platform.c

@@ -25,6 +25,9 @@ in the source distribution for its full text.
 
 #include <math.h>
 #include <assert.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
 
 /*{
 #include "Action.h"
@@ -205,3 +208,28 @@ void Platform_setSwapValues(Meter* this) {
    this->total = pl->totalSwap;
    this->values[0] = pl->usedSwap;
 }
+
+char* Platform_getProcessEnv(pid_t pid) {
+   char procname[32+1];
+   snprintf(procname, 32, "/proc/%d/environ", pid);
+   FILE* fd = fopen(procname, "r");
+   char *env = NULL;
+   if (fd) {
+      size_t capacity = 4096, size = 0, bytes;
+      env = malloc(capacity);
+      while (env && (bytes = fread(env+size, 1, capacity-size, fd)) > 0) {
+         size += bytes;
+         capacity *= 2;
+         env = realloc(env, capacity);
+      }
+      fclose(fd);
+      if (size < 2 || env[size-1] || env[size-2]) {
+         if (size + 2 < capacity) {
+            env = realloc(env, capacity+2);
+         }
+         env[size] = 0;
+         env[size+1] = 0;
+      }
+   }
+   return env;
+}

linux/Platform.h

@@ -39,4 +39,6 @@ void Platform_setMemoryValues(Meter* this);
 
 void Platform_setSwapValues(Meter* this);
 
+char* Platform_getProcessEnv(pid_t pid);
+
 #endif

openbsd/Platform.c

@@ -295,3 +295,8 @@ void Platform_setSwapValues(Meter* this) {
 void Platform_setTasksValues(Meter* this) {
    // TODO
 }
+
+char* Platform_getProcessEnv(pid_t pid) {
+   // TODO
+   return NULL;
+}

unsupported/Platform.c

@@ -131,3 +131,6 @@ bool Process_isThread(Process* this) {
    return false;
 }
 
+char* Platform_getProcessEnv(pid_t pid) {
+   return NULL;
+}