cast pid as integer

lib/stats.js

@@ -14,8 +14,9 @@ var stats = {
 
     if(this.cpu !== null) {
       fs.readFile('/proc/uptime', 'utf8', function(err, uptime) {
-        if(err)
+        if(err) {
           return done(err, null)
+        }
 
         if(uptime === undefined) {
           console.error("[pidusage] We couldn't find uptime from /proc/uptime")
@@ -28,24 +29,26 @@ var stats = {
       })
     } else {
       helpers.cpu(function(err, cpu) {
-        if(err)
+        if(err) {
           return done(err, null)
+        }
 
         self.cpu = cpu
         return self.proc_calc(pid, options, done)
       })
     }
   },
   proc_calc: function(pid, options, done) {
+    pid = parseInt(pid, 10)
     var history = this.history[pid] ? this.history[pid] : {}
     var cpu = this.cpu
     var self = this
 
     //Arguments to path.join must be strings
     fs.readFile(p.join('/proc', ''+pid, 'stat'), 'utf8', function(err, infos) {
-
-      if(err)
+      if(err) {
         return done(err, null)
+      }
 
       //https://github.com/arunoda/node-usage/commit/a6ca74ecb8dd452c3c00ed2bde93294d7bb75aa8
       //preventing process space in name by removing values before last ) (pid (name) ...)
@@ -94,7 +97,7 @@ var stats = {
    * on solaris 11 can't figure out a way to do this properly so...
    */
   ps: function(pid, options, done) {
-
+    pid = parseInt(pid, 10)
     var cmd = 'ps -o pcpu,rss -p '
 
     if(os.platform() == 'aix')
@@ -117,6 +120,7 @@ var stats = {
    * This is really in a beta stage
    */
   win: function(pid, options, done) {
+    pid = parseInt(pid, 10)
     var history = this.history[pid] ? this.history[pid] : {}
 		//  http://social.msdn.microsoft.com/Forums/en-US/469ec6b7-4727-4773-9dc7-6e3de40e87b8/cpu-usage-in-for-each-active-process-how-is-this-best-determined-and-implemented-in-an?forum=csharplanguage
     var args = 'PROCESS ' + pid + ' get workingsetsize,usermodetime,kernelmodetime'