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| 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 |
| 5 package net |
| 6 |
| 7 import ( |
| 8 "syscall" |
| 9 ) |
| 10 |
| 11 // Accept4() comes from Linux 2.6.28. |
| 12 // Fallback to Accept() when Accept4() returns ENOSYS. |
| 13 var useAccept4 bool = true |
| 14 |
| 15 func (fd *netFD) accept(toAddr func(syscall.Sockaddr) Addr) (netfd *netFD, err e
rror) { |
| 16 if err := fd.incref(false); err != nil { |
| 17 return nil, err |
| 18 } |
| 19 defer fd.decref() |
| 20 |
| 21 accept4 := useAccept4 |
| 22 |
| 23 // See ../syscall/exec_unix.go for description of ForkLock. |
| 24 // It is okay to hold the lock across syscall.Accept |
| 25 // because we have put fd.sysfd into non-blocking mode. |
| 26 var s int |
| 27 var rsa syscall.Sockaddr |
| 28 for { |
| 29 if accept4 { |
| 30 s, rsa, err = syscall.Accept4(fd.sysfd, syscall.SOCK_CLO
EXEC|syscall.SOCK_NONBLOCK) |
| 31 if err == syscall.ENOSYS { |
| 32 accept4 = false |
| 33 useAccept4 = false |
| 34 continue |
| 35 } |
| 36 } else { |
| 37 syscall.ForkLock.RLock() |
| 38 s, rsa, err = syscall.Accept(fd.sysfd) |
| 39 if err == nil { |
| 40 syscall.CloseOnExec(s) |
| 41 } |
| 42 syscall.ForkLock.RUnlock() |
| 43 } |
| 44 if err != nil { |
| 45 if err == syscall.EAGAIN { |
| 46 if err = fd.pollServer.WaitRead(fd); err == nil
{ |
| 47 continue |
| 48 } |
| 49 } else if err == syscall.ECONNABORTED { |
| 50 // This means that a socket on the listen queue
was closed |
| 51 // before we Accept()ed it; it's a silly error,
so try again. |
| 52 continue |
| 53 } |
| 54 return nil, &OpError{"accept", fd.net, fd.laddr, err} |
| 55 } |
| 56 break |
| 57 } |
| 58 |
| 59 if !accept4 { |
| 60 if err = syscall.SetNonblock(s, true); err != nil { |
| 61 closesocket(s) |
| 62 return nil, err |
| 63 } |
| 64 } |
| 65 netfd = newFD(s, fd.family, fd.sotype, fd.net) |
| 66 lsa, _ := syscall.Getsockname(netfd.sysfd) |
| 67 netfd.setAddr(toAddr(lsa), toAddr(rsa)) |
| 68 return netfd, nil |
| 69 } |
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