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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This file implements sysSocket for platforms that provide a fast path for
// setting SetNonblock and CloseOnExec.
//go:build dragonfly || freebsd || linux || netbsd || openbsd || solaris
package net
import (
"internal/poll"
"os"
"syscall"
)
// Wrapper around the socket system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func sysSocket(family, sotype, proto int) (int, error) {
s, err := socketFunc(family, sotype|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, proto)
// TODO: We can remove the fallback on Linux and *BSD,
// as currently supported versions all support accept4
// with SOCK_CLOEXEC, but Solaris does not. See issue #59359.
switch err {
case nil:
return s, nil
default:
return -1, os.NewSyscallError("socket", err)
case syscall.EPROTONOSUPPORT, syscall.EINVAL:
}
// See ../syscall/exec_unix.go for description of ForkLock.
syscall.ForkLock.RLock()
s, err = socketFunc(family, sotype, proto)
if err == nil {
syscall.CloseOnExec(s)
}
syscall.ForkLock.RUnlock()
if err != nil {
return -1, os.NewSyscallError("socket", err)
}
if err = syscall.SetNonblock(s, true); err != nil {
poll.CloseFunc(s)
return -1, os.NewSyscallError("setnonblock", err)
}
return s, nil
}