Use socketcall on x86

syscall_linux_386.go

@@ -0,0 +1,53 @@
+// +build linux,386
+
+/* Copyright 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+package main
+
+import (
+	"golang.org/x/sys/unix"
+	"syscall"
+	"unsafe"
+)
+
+const (
+	_SENDMSG = 16
+	_RECVMSG = 17
+)
+
+func sendmsg(fd int, msghdr *unix.Msghdr, flags int) (uintptr, uintptr, syscall.Errno) {
+	args := struct {
+		fd     uintptr
+		msghdr uintptr
+		flags  uintptr
+	}{
+		uintptr(fd),
+		uintptr(unsafe.Pointer(msghdr)),
+		uintptr(flags),
+	}
+	return unix.Syscall(
+		unix.SYS_SOCKETCALL,
+		_SENDMSG,
+		uintptr(unsafe.Pointer(&args)),
+		0,
+	)
+}
+
+func recvmsg(fd int, msghdr *unix.Msghdr, flags int) (uintptr, uintptr, syscall.Errno) {
+	args := struct {
+		fd     uintptr
+		msghdr uintptr
+		flags  uintptr
+	}{
+		uintptr(fd),
+		uintptr(unsafe.Pointer(msghdr)),
+		uintptr(flags),
+	}
+	return unix.Syscall(
+		unix.SYS_SOCKETCALL,
+		_RECVMSG,
+		uintptr(unsafe.Pointer(&args)),
+		0,
+	)
+}