github.com/SandwichDev/go-internals@v0.0.0-20210605002614-12311ac6b2c5/poll/errno_windows.go (about)

     1  // Copyright 2019 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  // +build windows
     6  
     7  package poll
     8  
     9  import "syscall"
    10  
    11  // Do the interface allocations only once for common
    12  // Errno values.
    13  
    14  var (
    15  	errERROR_IO_PENDING error = syscall.Errno(syscall.ERROR_IO_PENDING)
    16  )
    17  
    18  // ErrnoErr returns common boxed Errno values, to prevent
    19  // allocations at runtime.
    20  func errnoErr(e syscall.Errno) error {
    21  	switch e {
    22  	case 0:
    23  		return nil
    24  	case syscall.ERROR_IO_PENDING:
    25  		return errERROR_IO_PENDING
    26  	}
    27  	// TODO: add more here, after collecting data on the common
    28  	// error values see on Windows. (perhaps when running
    29  	// all.bat?)
    30  	return e
    31  }