go errno_windows 源码

golang errno_windows 代码

文件路径：/src/internal/poll/errno_windows.go

/ Copyright 2019 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.

/go:build windows

package poll

import "syscall"

/ Do the interface allocations only once for common
/ Errno values.

var (
	errERROR_IO_PENDING error = syscall.Errno(syscall.ERROR_IO_PENDING)
)

/ ErrnoErr returns common boxed Errno values, to prevent
/ allocations at runtime.
func errnoErr(e syscall.Errno) error {
	switch e {
	case 0:
		return nil
	case syscall.ERROR_IO_PENDING:
		return errERROR_IO_PENDING
	}
	/ TODO: add more here, after collecting data on the common
	/ error values see on Windows. (perhaps when running
	/ all.bat?)
	return e
}

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