Ian Lance Taylor | 31f58dc | 2013-01-28 08:54:15 -0800 | [diff] [blame] | 1 | // Copyright 2013 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 | |
Tobias Klauser | 3f8e648 | 2021-04-20 12:58:53 +0200 | [diff] [blame] | 5 | // This file implements sysSocket for platforms that provide a fast path for |
| 6 | // setting SetNonblock and CloseOnExec. |
Ian Lance Taylor | 31f58dc | 2013-01-28 08:54:15 -0800 | [diff] [blame] | 7 | |
Russ Cox | d4b2638 | 2021-02-19 18:35:10 -0500 | [diff] [blame] | 8 | //go:build dragonfly || freebsd || illumos || linux || netbsd || openbsd |
Ian Lance Taylor | 31f58dc | 2013-01-28 08:54:15 -0800 | [diff] [blame] | 9 | |
| 10 | package net |
| 11 | |
Mikio Hara | 055ecb7 | 2015-04-21 21:20:15 +0900 | [diff] [blame] | 12 | import ( |
Ian Lance Taylor | 3792db5 | 2017-02-10 14:59:38 -0800 | [diff] [blame] | 13 | "internal/poll" |
Mikio Hara | 055ecb7 | 2015-04-21 21:20:15 +0900 | [diff] [blame] | 14 | "os" |
| 15 | "syscall" |
| 16 | ) |
Ian Lance Taylor | 31f58dc | 2013-01-28 08:54:15 -0800 | [diff] [blame] | 17 | |
| 18 | // Wrapper around the socket system call that marks the returned file |
| 19 | // descriptor as nonblocking and close-on-exec. |
Mikio Hara | 1d086e3 | 2014-03-04 09:28:09 +0900 | [diff] [blame] | 20 | func sysSocket(family, sotype, proto int) (int, error) { |
Mikio Hara | 29d1f3b | 2015-03-01 12:27:01 +0900 | [diff] [blame] | 21 | s, err := socketFunc(family, sotype|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, proto) |
Mikio Hara | 1d086e3 | 2014-03-04 09:28:09 +0900 | [diff] [blame] | 22 | // On Linux the SOCK_NONBLOCK and SOCK_CLOEXEC flags were |
| 23 | // introduced in 2.6.27 kernel and on FreeBSD both flags were |
| 24 | // introduced in 10 kernel. If we get an EINVAL error on Linux |
| 25 | // or EPROTONOSUPPORT error on FreeBSD, fall back to using |
| 26 | // socket without them. |
Mikio Hara | 055ecb7 | 2015-04-21 21:20:15 +0900 | [diff] [blame] | 27 | switch err { |
| 28 | case nil: |
| 29 | return s, nil |
| 30 | default: |
| 31 | return -1, os.NewSyscallError("socket", err) |
| 32 | case syscall.EPROTONOSUPPORT, syscall.EINVAL: |
Ian Lance Taylor | 31f58dc | 2013-01-28 08:54:15 -0800 | [diff] [blame] | 33 | } |
| 34 | |
| 35 | // See ../syscall/exec_unix.go for description of ForkLock. |
| 36 | syscall.ForkLock.RLock() |
Mikio Hara | 29d1f3b | 2015-03-01 12:27:01 +0900 | [diff] [blame] | 37 | s, err = socketFunc(family, sotype, proto) |
Ian Lance Taylor | 31f58dc | 2013-01-28 08:54:15 -0800 | [diff] [blame] | 38 | if err == nil { |
| 39 | syscall.CloseOnExec(s) |
| 40 | } |
| 41 | syscall.ForkLock.RUnlock() |
| 42 | if err != nil { |
Mikio Hara | 055ecb7 | 2015-04-21 21:20:15 +0900 | [diff] [blame] | 43 | return -1, os.NewSyscallError("socket", err) |
Ian Lance Taylor | 31f58dc | 2013-01-28 08:54:15 -0800 | [diff] [blame] | 44 | } |
| 45 | if err = syscall.SetNonblock(s, true); err != nil { |
Ian Lance Taylor | 3792db5 | 2017-02-10 14:59:38 -0800 | [diff] [blame] | 46 | poll.CloseFunc(s) |
Mikio Hara | 055ecb7 | 2015-04-21 21:20:15 +0900 | [diff] [blame] | 47 | return -1, os.NewSyscallError("setnonblock", err) |
Ian Lance Taylor | 31f58dc | 2013-01-28 08:54:15 -0800 | [diff] [blame] | 48 | } |
| 49 | return s, nil |
| 50 | } |