integrate inotify syscalls

internal/process/process.go

@@ -0,0 +1,68 @@
+package process
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"strconv"
+)
+
+type ProcList map[int]string
+
+// type Proc struct {
+// 	Cmd  string
+// 	User string
+// }
+
+func NewProcList() *ProcList {
+	pl := make(ProcList)
+	return &pl
+}
+
+func (pl ProcList) Refresh() error {
+	proc, err := ioutil.ReadDir("/proc")
+	if err != nil {
+		return fmt.Errorf("opening proc dir: %v", err)
+	}
+
+	pids := make([]int, 0)
+
+	for _, f := range proc {
+		if f.IsDir() {
+			name := f.Name()
+			pid, err := strconv.Atoi(name)
+			if err != nil {
+				continue // not a pid
+			}
+			pids = append(pids, pid)
+		}
+	}
+
+	for i := len(pids) - 1; i >= 0; i-- {
+		pid := pids[i]
+		_, ok := pl[pid]
+		if !ok {
+			cmd, err := getCmd(pid)
+			if err != nil {
+				cmd = "UNKNOWN" // process probably terminated
+			}
+			log.Printf("New process: %5d: %s\n", pid, cmd)
+			pl[pid] = cmd
+		}
+	}
+	return nil
+}
+
+func getCmd(pid int) (string, error) {
+	cmdPath := fmt.Sprintf("/proc/%d/cmdline", pid)
+	cmd, err := ioutil.ReadFile(cmdPath)
+	if err != nil {
+		return "", err
+	}
+	for i := 0; i < len(cmd); i++ {
+		if cmd[i] == 0 {
+			cmd[i] = 32
+		}
+	}
+	return string(cmd), nil
+}