Cross platform support for the 'processes' plugin

closes #798

plugins/inputs/system/processes.go

@@ -1,8 +1,11 @@
+// +build !windows
+
 package system
 
 import (
 	"fmt"
 	"log"
+	"runtime"
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
@@ -23,32 +26,73 @@ func (s *Processes) Gather(acc telegraf.Accumulator) error {
 	if err != nil {
 		return fmt.Errorf("error getting pids list: %s", err)
 	}
+
 	// TODO handle other OS (Windows/BSD/Solaris/OSX)
 	fields := map[string]interface{}{
-		"paging":   uint64(0),
-		"blocked":  uint64(0),
-		"zombie":   uint64(0),
-		"stopped":  uint64(0),
-		"running":  uint64(0),
-		"sleeping": uint64(0),
+		"blocked":  int64(0),
+		"zombie":   int64(0),
+		"stopped":  int64(0),
+		"running":  int64(0),
+		"sleeping": int64(0),
+	}
+
+	switch runtime.GOOS {
+	case "freebsd":
+		fields["idle"] = int64(0)
+		fields["wait"] = int64(0)
+	case "darwin":
+		fields["idle"] = int64(0)
+	case "openbsd":
+		fields["idle"] = int64(0)
+	case "linux":
+		fields["paging"] = int64(0)
 	}
+
 	for _, pid := range pids {
 		process, err := process.NewProcess(pid)
 		if err != nil {
 			log.Printf("Can not get process %d status: %s", pid, err)
 			continue
 		}
 		status, err := process.Status()
-		if err != nil {
+		if err != nil || len(status) == 0 {
 			log.Printf("Can not get process %d status: %s\n", pid, err)
 			continue
 		}
+
+		if status == "disk sleep" {
+			status = "blocked"
+		}
+
+		switch status[0:1] {
+		case "W":
+			switch runtime.GOOS {
+			case "freebsd":
+				status = "wait"
+			default:
+				status = "paging"
+			}
+		case "U", "D":
+			// Also known as uninterruptible sleep or disk sleep
+			status = "blocked"
+		case "Z":
+			status = "zombie"
+		case "T":
+			status = "stopped"
+		case "R":
+			status = "running"
+		case "S":
+			status = "sleeping"
+		case "I":
+			status = "idle"
+		}
+
 		_, exists := fields[status]
 		if !exists {
-			log.Printf("Status '%s' for process with pid: %d\n", status, pid)
+			log.Printf("Unknown Status '%s' for process with pid: %d\n", status, pid)
 			continue
 		}
-		fields[status] = fields[status].(uint64) + uint64(1)
+		fields[status] = fields[status].(int64) + int64(1)
 	}
 
 	acc.AddFields("processes", fields, nil)