Initial commit

vendor/go.i3wm.org/i3/getpid.go

@@ -0,0 +1,44 @@
+package i3
+
+import (
+	"sync"
+
+	"github.com/BurntSushi/xgbutil"
+	"github.com/BurntSushi/xgbutil/xprop"
+)
+
+func i3Pid() int {
+	xu, err := xgbutil.NewConn()
+	if err != nil {
+		return -1 // X session terminated
+	}
+	defer xu.Conn().Close()
+	reply, err := xprop.GetProperty(xu, xu.RootWin(), "I3_PID")
+	if err != nil {
+		return -1 // I3_PID no longer present (X session replaced?)
+	}
+	num, err := xprop.PropValNum(reply, err)
+	if err != nil {
+		return -1
+	}
+	return int(num)
+}
+
+var lastPid struct {
+	sync.Mutex
+	pid int
+}
+
+// IsRunningHook provides a method to override the method which detects if i3 is running or not
+var IsRunningHook = func() bool {
+	lastPid.Lock()
+	defer lastPid.Unlock()
+	if !wasRestart || lastPid.pid == 0 {
+		lastPid.pid = i3Pid()
+	}
+	return pidValid(lastPid.pid)
+}
+
+func i3Running() bool {
+	return IsRunningHook()
+}