freebsd: add initial support for running on FreeBSD, excluding Bluez,

ppd, and some things. Add a simple wpa_supplicant backend

core/internal/server/brightness/devd_freebsd.go

@@ -0,0 +1,162 @@
+package brightness
+
+import (
+	"net"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/log"
+)
+
+// devd(8) publishes device events on this SOCK_SEQPACKET socket, one
+// "!system=... subsystem=... type=..." record per packet.
+const devdSocketPath = "/var/run/devd.seqpacket.pipe"
+
+const (
+	devdMaxRetries = 5
+	devdBaseDelay  = 2 * time.Second
+	devdMaxDelay   = 60 * time.Second
+)
+
+type DevdMonitor struct {
+	stop          chan struct{}
+	rescanMutex   sync.Mutex
+	rescanTimer   *time.Timer
+	rescanPending bool
+}
+
+func newDevdMonitor(manager *Manager) *DevdMonitor {
+	m := &DevdMonitor{
+		stop: make(chan struct{}),
+	}
+
+	go m.run(manager)
+	return m
+}
+
+func (m *DevdMonitor) run(manager *Manager) {
+	failures := 0
+	for {
+		if err := m.monitorLoop(manager); err != nil {
+			log.Errorf("Devd monitor error: %v", err)
+		}
+
+		select {
+		case <-m.stop:
+			return
+		default:
+		}
+
+		failures++
+		if failures > devdMaxRetries {
+			log.Errorf("Devd monitor exceeded %d retries, giving up", devdMaxRetries)
+			return
+		}
+
+		delay := min(devdBaseDelay*time.Duration(1<<(failures-1)), devdMaxDelay)
+		log.Infof("Devd monitor reconnecting in %v (attempt %d/%d)", delay, failures, devdMaxRetries)
+
+		select {
+		case <-m.stop:
+			return
+		case <-time.After(delay):
+		}
+	}
+}
+
+func (m *DevdMonitor) monitorLoop(manager *Manager) error {
+	conn, err := net.Dial("unixpacket", devdSocketPath)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+
+	done := make(chan struct{})
+	defer close(done)
+	go func() {
+		select {
+		case <-m.stop:
+			conn.Close()
+		case <-done:
+		}
+	}()
+
+	log.Info("Devd monitor started for backlight/drm events")
+
+	buf := make([]byte, 8192)
+	for {
+		n, err := conn.Read(buf)
+		if err != nil {
+			select {
+			case <-m.stop:
+				return nil
+			default:
+				return err
+			}
+		}
+		m.handleEvent(manager, string(buf[:n]))
+	}
+}
+
+func (m *DevdMonitor) handleEvent(manager *Manager, event string) {
+	notification, ok := strings.CutPrefix(event, "!")
+	if !ok {
+		return
+	}
+
+	fields := parseDevdEvent(notification)
+	switch fields["system"] {
+	case "DRM":
+		m.debouncedRescan(manager)
+	case "DEVFS":
+		if fields["subsystem"] != "CDEV" {
+			return
+		}
+		if !strings.HasPrefix(fields["cdev"], "backlight/") {
+			return
+		}
+		m.debouncedRescan(manager)
+	}
+}
+
+func parseDevdEvent(s string) map[string]string {
+	fields := make(map[string]string)
+	for _, part := range strings.Fields(s) {
+		k, v, ok := strings.Cut(part, "=")
+		if !ok {
+			continue
+		}
+		fields[k] = v
+	}
+	return fields
+}
+
+func (m *DevdMonitor) debouncedRescan(manager *Manager) {
+	m.rescanMutex.Lock()
+	defer m.rescanMutex.Unlock()
+
+	m.rescanPending = true
+
+	if m.rescanTimer != nil {
+		m.rescanTimer.Reset(2 * time.Second)
+		return
+	}
+
+	m.rescanTimer = time.AfterFunc(2*time.Second, func() {
+		m.rescanMutex.Lock()
+		pending := m.rescanPending
+		m.rescanPending = false
+		m.rescanMutex.Unlock()
+
+		if !pending {
+			return
+		}
+
+		manager.Rescan()
+	})
+}
+
+func (m *DevdMonitor) Close() {
+	close(m.stop)
+}