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 | package socket |
| 6 | |
| 7 | import ( |
| 8 | "syscall" |
| 9 | "unsafe" |
| 10 | ) |
| 11 | |
| 12 | func probeProtocolStack() int { return 8 } |
| 13 | |
| 14 | const ( |
| 15 | sysSETSOCKOPT = 0xe |
| 16 | sysGETSOCKOPT = 0xf |
| 17 | sysSENDMSG = 0x10 |
| 18 | sysRECVMSG = 0x11 |
| 19 | sysRECVMMSG = 0x13 |
| 20 | sysSENDMMSG = 0x14 |
| 21 | ) |
| 22 | |
| 23 | func socketcall(call, a0, a1, a2, a3, a4, a5 uintptr) (uintptr, syscall.Errno) |
| 24 | func rawsocketcall(call, a0, a1, a2, a3, a4, a5 uintptr) (uintptr, syscall.Errno) |
| 25 | |
| 26 | func getsockopt(s uintptr, level, name int, b []byte) (int, error) { |
| 27 | l := uint32(len(b)) |
| 28 | _, errno := socketcall(sysGETSOCKOPT, s, uintptr(level), uintptr(name), uintptr(unsafe.Pointer(&b[0])), uintptr(unsafe.Pointer(&l)), 0) |
| 29 | return int(l), errnoErr(errno) |
| 30 | } |
| 31 | |
| 32 | func setsockopt(s uintptr, level, name int, b []byte) error { |
| 33 | _, errno := socketcall(sysSETSOCKOPT, s, uintptr(level), uintptr(name), uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)), 0) |
| 34 | return errnoErr(errno) |
| 35 | } |
| 36 | |
| 37 | func recvmsg(s uintptr, h *msghdr, flags int) (int, error) { |
| 38 | n, errno := socketcall(sysRECVMSG, s, uintptr(unsafe.Pointer(h)), uintptr(flags), 0, 0, 0) |
| 39 | return int(n), errnoErr(errno) |
| 40 | } |
| 41 | |
| 42 | func sendmsg(s uintptr, h *msghdr, flags int) (int, error) { |
| 43 | n, errno := socketcall(sysSENDMSG, s, uintptr(unsafe.Pointer(h)), uintptr(flags), 0, 0, 0) |
| 44 | return int(n), errnoErr(errno) |
| 45 | } |
| 46 | |
| 47 | func recvmmsg(s uintptr, hs []mmsghdr, flags int) (int, error) { |
| 48 | n, errno := socketcall(sysRECVMMSG, s, uintptr(unsafe.Pointer(&hs[0])), uintptr(len(hs)), uintptr(flags), 0, 0) |
| 49 | return int(n), errnoErr(errno) |
| 50 | } |
| 51 | |
| 52 | func sendmmsg(s uintptr, hs []mmsghdr, flags int) (int, error) { |
| 53 | n, errno := socketcall(sysSENDMMSG, s, uintptr(unsafe.Pointer(&hs[0])), uintptr(len(hs)), uintptr(flags), 0, 0) |
| 54 | return int(n), errnoErr(errno) |
| 55 | } |