Checkin for bug 120866. Add getenv() support to autoconfig module. Checking in for Jerry Tan. r=dveditz, sr=alecf, a=asa.

extensions/pref/autoconfig/src/prefcalls.js

@@ -197,3 +197,15 @@ function displayError(message) {
         promptService.alert(null, title, err);
     } 
 }
+
+function getenv(name) {
+	
+    try {
+        var currentProcess=Components.classes["@mozilla.org/process/util;1"].createInstance(Components.interfaces.nsIProcess);
+        return currentProcess.getEnvironment(name);
+    }
+    catch(e) {
+        displayError("getEnvironment failed with error: " + e);
+    }
+}
+

xpcom/threads/nsIProcess.idl

@@ -16,6 +16,16 @@ interface nsIProcess : nsISupports
 	readonly attribute string processName;
 	readonly attribute unsigned long processSignature;
 	readonly attribute long exitValue;
+
+        /**
+         * Called to get the value of environment variable
+         *
+         * @param aName     The string enviroment variable name 
+         * @exception       NS_ERROR_OUT_OF_MEMORY
+         *
+         * @return 	    The value of the requested string environment variable name
+         */ 
+        string getEnvironment(in string aName);
 };
 
 %{C++

xpcom/threads/nsProcessCommon.cpp

@@ -35,6 +35,8 @@
 #include "nsProcess.h"
 #include "prtypes.h"
 #include "prio.h"
+#include "prenv.h"
+#include "nsCRT.h"
 
 #include <stdlib.h>
 
@@ -345,3 +347,13 @@ nsProcess::GetExitValue(PRInt32 *aExitValue)
     return NS_OK;
 }
 
+NS_IMETHODIMP
+nsProcess::GetEnvironment(const char *aName, char **aValue)
+{
+    NS_ENSURE_ARG_POINTER(aName);
+    *aValue = nsCRT::strdup(PR_GetEnv(aName));
+    if (!*aValue)
+        return NS_ERROR_OUT_OF_MEMORY;
+    return NS_OK;
+} 
+

xpcom/threads/nsProcessMac.cpp

@@ -38,6 +38,8 @@
 
 #include "prtypes.h"
 #include "prio.h"
+#include "prenv.h"
+#include "nsCRT.h"
 #include "prthread.h"
 
 #include <stdlib.h>
@@ -138,6 +140,17 @@ NS_IMETHODIMP nsProcess::InitWithPid(PRUint32 pid)
     return NS_ERROR_NOT_IMPLEMENTED;
 }
 
+
+NS_IMETHODIMP
+nsProcess::GetEnvironment(const char *aName, char **aValue)
+{
+    NS_ENSURE_ARG_POINTER(aName);
+    *aValue = nsCRT::strdup(PR_GetEnv(aName));
+    if (!*aValue)
+        return NS_ERROR_OUT_OF_MEMORY;
+    return NS_OK;
+} 
+
 NS_IMETHODIMP
 nsProcess::GetLocation(nsIFile** aLocation)
 {