vendor/golang.org/x/sys/unix/syscall_unix.go

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// Copyright 2009 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.

// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris

package unix

import (
	"bytes"
	"sort"
	"sync"
	"syscall"
	"unsafe"
)

var (
	Stdin  = 0
	Stdout = 1
	Stderr = 2
)

// Do the interface allocations only once for common
// Errno values.
var (
	errEAGAIN error = syscall.EAGAIN
	errEINVAL error = syscall.EINVAL
	errENOENT error = syscall.ENOENT
)

var (
	signalNameMapOnce sync.Once
	signalNameMap     map[string]syscall.Signal
)

// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e syscall.Errno) error {
	switch e {
	case 0:
		return nil
	case EAGAIN:
		return errEAGAIN
	case EINVAL:
		return errEINVAL
	case ENOENT:
		return errENOENT
	}
	return e
}

// ErrnoName returns the error name for error number e.
func ErrnoName(e syscall.Errno) string {
	i := sort.Search(len(errorList), func(i int) bool {
		return errorList[i].num >= e
	})
	if i < len(errorList) && errorList[i].num == e {
		return errorList[i].name
	}
	return ""