github.com/code-reading/golang@v0.0.0-20220303082512-ba5bc0e589a3/go/src/net/sys_cloexec.go (about)

     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  // This file implements sysSocket for platforms that do not provide a fast path
     6  // for setting SetNonblock and CloseOnExec.
     7  
     8  //go:build aix || darwin || (solaris && !illumos)
     9  // +build aix darwin solaris,!illumos
    10  
    11  package net
    12  
    13  import (
    14  	"internal/poll"
    15  	"os"
    16  	"syscall"
    17  )
    18  
    19  // Wrapper around the socket system call that marks the returned file
    20  // descriptor as nonblocking and close-on-exec.
    21  func sysSocket(family, sotype, proto int) (int, error) {
    22  	// See ../syscall/exec_unix.go for description of ForkLock.
    23  	syscall.ForkLock.RLock()
    24  	s, err := socketFunc(family, sotype, proto)
    25  	if err == nil {
    26  		syscall.CloseOnExec(s)
    27  	}
    28  	syscall.ForkLock.RUnlock()
    29  	if err != nil {
    30  		return -1, os.NewSyscallError("socket", err)
    31  	}
    32  	if err = syscall.SetNonblock(s, true); err != nil {
    33  		poll.CloseFunc(s)
    34  		return -1, os.NewSyscallError("setnonblock", err)
    35  	}
    36  	return s, nil
    37  }