add darwin

tcpkeepalive_darwin.go

@@ -0,0 +1,42 @@
+package tcpkeepalive
+
+import (
+	"os"
+	"syscall"
+	"time"
+)
+
+const _TCP_KEEPIDLE = syscall.TCP_KEEPALIVE
+const _TCP_KEEPINTVL = 0x101 /* interval between keepalives */
+const _TCP_KEEPCNT = 0x102   /* number of keepalives before close */
+
+func setIdle(fd uintptr, d time.Duration) error {
+	// All versions of darwin support this
+	secs := durToSecs(d)
+	err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, _TCP_KEEPIDLE, secs)
+	return os.NewSyscallError("setsockopt", err)
+}
+
+func setCount(fd uintptr, n int) error {
+	err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, _TCP_KEEPCNT, n)
+	return os.NewSyscallError("setsockopt", err)
+}
+
+func setInterval(fd uintptr, d time.Duration) error {
+	// # from https://golang.org/src/net/tcpsockopt_darwin.go
+	secs := durToSecs(d)
+	err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, _TCP_KEEPINTVL, secs)
+
+	// OS X 10.7 and earlier don't support this option
+	if err == nil || err == syscall.ENOPROTOOPT {
+		return nil
+	}
+
+	return os.NewSyscallError("setsockopt", err)
+}
+
+func durToSecs(d time.Duration) int {
+	d += (time.Second - time.Nanosecond)
+	secs := int(d.Seconds())
+	return secs
+}