sys_cloexec.go

     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  
    10  package net
    11  
    12  import (
    13  	"internal/poll"
    14  	"os"
    15  	"syscall"
    16  )
    17  
    18  // Wrapper around the socket system call that marks the returned file
    19  // descriptor as nonblocking and close-on-exec.
    20  func sysSocket(family, sotype, proto int) (int, error) {
    21  	// See ../syscall/exec_unix.go for description of ForkLock.
    22  	syscall.ForkLock.RLock()
    23  	s, err := socketFunc(family, sotype, proto)
    24  	if err == nil {
    25  		syscall.CloseOnExec(s)
    26  	}
    27  	syscall.ForkLock.RUnlock()
    28  	if err != nil {
    29  		return -1, os.NewSyscallError("socket", err)
    30  	}
    31  	if err = syscall.SetNonblock(s, true); err != nil {
    32  		poll.CloseFunc(s)
    33  		return -1, os.NewSyscallError("setnonblock", err)
    34  	}
    35  	return s, nil
    36  }
    37
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