David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 1 | // Copyright 2017 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | // +build go1.9 |
| 6 | // +build darwin dragonfly freebsd linux netbsd openbsd solaris windows |
| 7 | |
| 8 | package socket |
| 9 | |
| 10 | import ( |
| 11 | "os" |
| 12 | "syscall" |
| 13 | ) |
| 14 | |
| 15 | func (c *Conn) recvMsg(m *Message, flags int) error { |
| 16 | var h msghdr |
| 17 | vs := make([]iovec, len(m.Buffers)) |
| 18 | var sa []byte |
| 19 | if c.network != "tcp" { |
| 20 | sa = make([]byte, sizeofSockaddrInet6) |
| 21 | } |
| 22 | h.pack(vs, m.Buffers, m.OOB, sa) |
| 23 | var operr error |
| 24 | var n int |
| 25 | fn := func(s uintptr) bool { |
| 26 | n, operr = recvmsg(s, &h, flags) |
| 27 | if operr == syscall.EAGAIN { |
| 28 | return false |
| 29 | } |
| 30 | return true |
| 31 | } |
| 32 | if err := c.c.Read(fn); err != nil { |
| 33 | return err |
| 34 | } |
| 35 | if operr != nil { |
| 36 | return os.NewSyscallError("recvmsg", operr) |
| 37 | } |
| 38 | if c.network != "tcp" { |
| 39 | var err error |
| 40 | m.Addr, err = parseInetAddr(sa[:], c.network) |
| 41 | if err != nil { |
| 42 | return err |
| 43 | } |
| 44 | } |
| 45 | m.N = n |
| 46 | m.NN = h.controllen() |
| 47 | m.Flags = h.flags() |
| 48 | return nil |
| 49 | } |
| 50 | |
| 51 | func (c *Conn) sendMsg(m *Message, flags int) error { |
| 52 | var h msghdr |
| 53 | vs := make([]iovec, len(m.Buffers)) |
| 54 | var sa []byte |
| 55 | if m.Addr != nil { |
| 56 | sa = marshalInetAddr(m.Addr) |
| 57 | } |
| 58 | h.pack(vs, m.Buffers, m.OOB, sa) |
| 59 | var operr error |
| 60 | var n int |
| 61 | fn := func(s uintptr) bool { |
| 62 | n, operr = sendmsg(s, &h, flags) |
| 63 | if operr == syscall.EAGAIN { |
| 64 | return false |
| 65 | } |
| 66 | return true |
| 67 | } |
| 68 | if err := c.c.Write(fn); err != nil { |
| 69 | return err |
| 70 | } |
| 71 | if operr != nil { |
| 72 | return os.NewSyscallError("sendmsg", operr) |
| 73 | } |
| 74 | m.N = n |
| 75 | m.NN = len(m.OOB) |
| 76 | return nil |
| 77 | } |