2011-04-02 15:28:58 -06:00
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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2012-03-12 19:50:04 -06:00
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// +build darwin freebsd linux netbsd openbsd
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build: add build comments to core packages
The go/build package already recognizes
system-specific file names like
mycode_darwin.go
mycode_darwin_386.go
mycode_386.s
However, it is also common to write files that
apply to multiple architectures, so a recent CL added
to go/build the ability to process comments
listing a set of conditions for building. For example:
// +build darwin freebsd openbsd/386
says that this file should be compiled only on
OS X, FreeBSD, or 32-bit x86 OpenBSD systems.
These conventions are not yet documented
(hence this long CL description).
This CL adds build comments to the multi-system
files in the core library, a step toward making it
possible to use go/build to build them.
With this change go/build can handle crypto/rand,
exec, net, path/filepath, os/user, and time.
os and syscall need additional adjustments.
R=golang-dev, r, gri, r, gustavo
CC=golang-dev
https://golang.org/cl/5011046
2011-09-15 14:48:57 -06:00
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2011-04-02 15:28:58 -06:00
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package os
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2012-02-14 12:22:34 -07:00
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import "syscall"
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2011-04-02 15:28:58 -06:00
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2012-02-16 16:04:29 -07:00
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// IsExist returns whether the error is known to report that a file already exists.
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// It is satisfied by ErrExist as well as some syscall errors.
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func IsExist(err error) bool {
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if pe, ok := err.(*PathError); ok {
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err = pe.Err
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}
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return err == syscall.EEXIST || err == ErrExist
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}
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// IsNotExist returns whether the error is known to report that a file does not exist.
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// It is satisfied by ErrNotExist as well as some syscall errors.
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func IsNotExist(err error) bool {
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if pe, ok := err.(*PathError); ok {
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err = pe.Err
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}
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return err == syscall.ENOENT || err == ErrNotExist
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}
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// IsPermission returns whether the error is known to report that permission is denied.
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// It is satisfied by ErrPermission as well as some syscall errors.
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func IsPermission(err error) bool {
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if pe, ok := err.(*PathError); ok {
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err = pe.Err
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}
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return err == syscall.EACCES || err == syscall.EPERM || err == ErrPermission
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}
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