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

ppd, and some things. Add a simple wpa_supplicant backend

core/internal/matugen/matugen.go

@@ -980,26 +980,6 @@ func signalTerminals(opts *Options) {
 	}
 }
 
-func signalByName(name string, sig syscall.Signal) {
-	entries, err := os.ReadDir("/proc")
-	if err != nil {
-		return
-	}
-	for _, entry := range entries {
-		pid, err := strconv.Atoi(entry.Name())
-		if err != nil {
-			continue
-		}
-		comm, err := os.ReadFile(filepath.Join("/proc", entry.Name(), "comm"))
-		if err != nil {
-			continue
-		}
-		if strings.TrimSpace(string(comm)) == name {
-			syscall.Kill(pid, sig)
-		}
-	}
-}
-
 func syncColorScheme(mode ColorMode) {
 	scheme := "prefer-dark"
 	if mode == ColorModeLight {

core/internal/matugen/signal_freebsd.go

@@ -0,0 +1,16 @@
+package matugen
+
+import (
+	"os/exec"
+	"strings"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+// procfs(5) is optional on FreeBSD; pkill(1) from base queries the kernel
+// directly.
+func signalByName(name string, sig syscall.Signal) {
+	signame := strings.TrimPrefix(unix.SignalName(sig), "SIG")
+	exec.Command("pkill", "-"+signame, "-x", name).Run()
+}

core/internal/matugen/signal_linux.go

@@ -0,0 +1,29 @@
+package matugen
+
+import (
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"syscall"
+)
+
+func signalByName(name string, sig syscall.Signal) {
+	entries, err := os.ReadDir("/proc")
+	if err != nil {
+		return
+	}
+	for _, entry := range entries {
+		pid, err := strconv.Atoi(entry.Name())
+		if err != nil {
+			continue
+		}
+		comm, err := os.ReadFile(filepath.Join("/proc", entry.Name(), "comm"))
+		if err != nil {
+			continue
+		}
+		if strings.TrimSpace(string(comm)) == name {
+			syscall.Kill(pid, sig)
+		}
+	}
+}