From ab24c97439d04a6f7faf29eb08da10c8d7e36415 Mon Sep 17 00:00:00 2001
From: Jean Kahrs <kahrs@twooit.de>
Date: Thu, 6 Oct 2016 15:32:25 +0200
Subject: [PATCH] break import cycle

---
 net/net_linux.go | 149 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 147 insertions(+), 2 deletions(-)

diff --git a/net/net_linux.go b/net/net_linux.go
index c9c5d40..217bba1 100644
--- a/net/net_linux.go
+++ b/net/net_linux.go
@@ -12,9 +12,9 @@ import (
 	"strconv"
 	"strings"
 	"syscall"
+	"time"
 
 	"github.com/shirou/gopsutil/internal/common"
-	"github.com/shirou/gopsutil/process"
 )
 
 // NetIOCounters returnes network I/O statistics for every network
@@ -351,7 +351,7 @@ func ConnectionsPid(kind string, pid int32) ([]ConnectionStat, error) {
 			}
 
 			// fetch process owner Real, effective, saved set, and filesystem UIDs
-			proc := process.Process{Pid: conn.Pid}
+			proc := Process{Pid: conn.Pid}
 			conn.Uids, _ = proc.Uids()
 
 			// check duplicate using JSON format
@@ -437,6 +437,151 @@ func Pids() ([]int32, error) {
 	return ret, nil
 }
 
+// Note: the following are copys of cpu_linux / process_linux structs and methods
+// we need these to fetch the owner of a process ID
+// FIXME: Import process occures import cycle.
+// see remarks on pids()
+type TimesStat struct {
+	CPU       string  `json:"cpu"`
+	User      float64 `json:"user"`
+	System    float64 `json:"system"`
+	Idle      float64 `json:"idle"`
+	Nice      float64 `json:"nice"`
+	Iowait    float64 `json:"iowait"`
+	Irq       float64 `json:"irq"`
+	Softirq   float64 `json:"softirq"`
+	Steal     float64 `json:"steal"`
+	Guest     float64 `json:"guest"`
+	GuestNice float64 `json:"guestNice"`
+	Stolen    float64 `json:"stolen"`
+}
+
+type Process struct {
+	Pid            int32 `json:"pid"`
+	name           string
+	status         string
+	parent         int32
+	numCtxSwitches *NumCtxSwitchesStat
+	uids           []int32
+	gids           []int32
+	numThreads     int32
+	memInfo        *MemoryInfoStat
+
+	lastCPUTimes *TimesStat
+	lastCPUTime  time.Time
+}
+
+type MemoryInfoStat struct {
+	RSS  uint64 `json:"rss"`  // bytes
+	VMS  uint64 `json:"vms"`  // bytes
+	Swap uint64 `json:"swap"` // bytes
+}
+
+type NumCtxSwitchesStat struct {
+	Voluntary   int64 `json:"voluntary"`
+	Involuntary int64 `json:"involuntary"`
+}
+
+// Uids returns user ids of the process as a slice of the int
+func (p *Process) Uids() ([]int32, error) {
+	err := p.fillFromStatus()
+	if err != nil {
+		return []int32{}, err
+	}
+	return p.uids, nil
+}
+
+// Get various status from /proc/(pid)/status
+func (p *Process) fillFromStatus() error {
+	pid := p.Pid
+	statPath := common.HostProc(strconv.Itoa(int(pid)), "status")
+	contents, err := ioutil.ReadFile(statPath)
+	if err != nil {
+		return err
+	}
+	lines := strings.Split(string(contents), "\n")
+	p.numCtxSwitches = &NumCtxSwitchesStat{}
+	p.memInfo = &MemoryInfoStat{}
+	for _, line := range lines {
+		tabParts := strings.SplitN(line, "\t", 2)
+		if len(tabParts) < 2 {
+			continue
+		}
+		value := tabParts[1]
+		switch strings.TrimRight(tabParts[0], ":") {
+		case "Name":
+			p.name = strings.Trim(value, " \t")
+		case "State":
+			p.status = value[0:1]
+		case "PPid", "Ppid":
+			pval, err := strconv.ParseInt(value, 10, 32)
+			if err != nil {
+				return err
+			}
+			p.parent = int32(pval)
+		case "Uid":
+			p.uids = make([]int32, 0, 4)
+			for _, i := range strings.Split(value, "\t") {
+				v, err := strconv.ParseInt(i, 10, 32)
+				if err != nil {
+					return err
+				}
+				p.uids = append(p.uids, int32(v))
+			}
+		case "Gid":
+			p.gids = make([]int32, 0, 4)
+			for _, i := range strings.Split(value, "\t") {
+				v, err := strconv.ParseInt(i, 10, 32)
+				if err != nil {
+					return err
+				}
+				p.gids = append(p.gids, int32(v))
+			}
+		case "Threads":
+			v, err := strconv.ParseInt(value, 10, 32)
+			if err != nil {
+				return err
+			}
+			p.numThreads = int32(v)
+		case "voluntary_ctxt_switches":
+			v, err := strconv.ParseInt(value, 10, 64)
+			if err != nil {
+				return err
+			}
+			p.numCtxSwitches.Voluntary = v
+		case "nonvoluntary_ctxt_switches":
+			v, err := strconv.ParseInt(value, 10, 64)
+			if err != nil {
+				return err
+			}
+			p.numCtxSwitches.Involuntary = v
+		case "VmRSS":
+			value := strings.Trim(value, " kB") // remove last "kB"
+			v, err := strconv.ParseUint(value, 10, 64)
+			if err != nil {
+				return err
+			}
+			p.memInfo.RSS = v * 1024
+		case "VmSize":
+			value := strings.Trim(value, " kB") // remove last "kB"
+			v, err := strconv.ParseUint(value, 10, 64)
+			if err != nil {
+				return err
+			}
+			p.memInfo.VMS = v * 1024
+		case "VmSwap":
+			value := strings.Trim(value, " kB") // remove last "kB"
+			v, err := strconv.ParseUint(value, 10, 64)
+			if err != nil {
+				return err
+			}
+			p.memInfo.Swap = v * 1024
+		}
+
+	}
+	return nil
+}
+
 func getProcInodesAll(root string) (map[string][]inodeMap, error) {
 	pids, err := Pids()
 	if err != nil {