mirror of
https://github.com/golang/go
synced 2024-11-11 22:50:22 -07:00
os: drop the Wait function and the options to Process.Wait
They are portability problems and the options are almost always zero in practice anyway. R=golang-dev, dsymonds, r, bradfitz CC=golang-dev https://golang.org/cl/5688046
This commit is contained in:
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17
doc/go1.html
17
doc/go1.html
@ -8,7 +8,7 @@
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<!-- Center the tables, and disable the 1995-era 3D borders -->
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<!-- Center the tables, and disable the 1995-era 3D borders -->
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<style>
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<style type="text/css">
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table { margin-left: auto; margin-right: auto; border-style: none; }
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table { margin-left: auto; margin-right: auto; border-style: none; }
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hr { border-style: none; border-top: 1px solid black; }
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hr { border-style: none; border-top: 1px solid black; }
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</style>
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</style>
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@ -1460,9 +1460,20 @@ use <a href="/pkg/os/#Environ"><code>os.Environ</code></a> or
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<a href="/pkg/syscall/#Getenv"><code>syscall.Getenv</code></a>.
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<a href="/pkg/syscall/#Getenv"><code>syscall.Getenv</code></a>.
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</p>
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</p>
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<p>
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The <a href="/pkg/os/#Process.Wait"><code>Process.Wait</code></a> method has
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dropped its option argument and the associated constants are gone
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from the package.
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Also, the function <code>Wait</code> is gone; only the method of
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the <code>Process</code> type persists.
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</p>
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<p>
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<p>
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<em>Updating</em>:
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<em>Updating</em>:
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Affected code will be caught by the compiler and must be updated by hand.
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Gofix will rewrite calls to <code>os.Wait</code> with an explicit zero
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argument, dropping the argument.
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All other changes will be caught by the compiler and must be updated by hand.
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</p>
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</p>
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<h4 id="os_fileinfo">The os.FileInfo type</h4>
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<h4 id="os_fileinfo">The os.FileInfo type</h4>
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@ -1915,7 +1926,7 @@ so that exported function definitions can use types defined there.
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This has the effect of compiling the preamble multiple times, so a
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This has the effect of compiling the preamble multiple times, so a
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package using <code>//export</code> must not put function definitions
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package using <code>//export</code> must not put function definitions
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or variable initializations in the C preamble.
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or variable initializations in the C preamble.
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</p
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</p>
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<h2 id="releases">Packaged releases</h2>
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<h2 id="releases">Packaged releases</h2>
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17
doc/go1.tmpl
17
doc/go1.tmpl
@ -4,7 +4,7 @@
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{{donotedit}}
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{{donotedit}}
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<!-- Center the tables, and disable the 1995-era 3D borders -->
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<!-- Center the tables, and disable the 1995-era 3D borders -->
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<style>
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<style type="text/css">
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table { margin-left: auto; margin-right: auto; border-style: none; }
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table { margin-left: auto; margin-right: auto; border-style: none; }
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hr { border-style: none; border-top: 1px solid black; }
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hr { border-style: none; border-top: 1px solid black; }
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</style>
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</style>
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@ -1363,9 +1363,20 @@ use <a href="/pkg/os/#Environ"><code>os.Environ</code></a> or
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<a href="/pkg/syscall/#Getenv"><code>syscall.Getenv</code></a>.
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<a href="/pkg/syscall/#Getenv"><code>syscall.Getenv</code></a>.
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</p>
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</p>
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<p>
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The <a href="/pkg/os/#Process.Wait"><code>Process.Wait</code></a> method has
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dropped its option argument and the associated constants are gone
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from the package.
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Also, the function <code>Wait</code> is gone; only the method of
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the <code>Process</code> type persists.
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</p>
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<p>
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<p>
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<em>Updating</em>:
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<em>Updating</em>:
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Affected code will be caught by the compiler and must be updated by hand.
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Gofix will rewrite calls to <code>os.Wait</code> with an explicit zero
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argument, dropping the argument.
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All other changes will be caught by the compiler and must be updated by hand.
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</p>
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</p>
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<h4 id="os_fileinfo">The os.FileInfo type</h4>
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<h4 id="os_fileinfo">The os.FileInfo type</h4>
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@ -1787,7 +1798,7 @@ so that exported function definitions can use types defined there.
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This has the effect of compiling the preamble multiple times, so a
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This has the effect of compiling the preamble multiple times, so a
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package using <code>//export</code> must not put function definitions
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package using <code>//export</code> must not put function definitions
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or variable initializations in the C preamble.
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or variable initializations in the C preamble.
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</p
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</p>
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<h2 id="releases">Packaged releases</h2>
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<h2 id="releases">Packaged releases</h2>
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@ -56,7 +56,7 @@ func run(stdin []byte, argv []string) (stdout, stderr []byte, ok bool) {
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<-c
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<-c
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<-c
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<-c
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w, err := p.Wait(0)
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w, err := p.Wait()
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if err != nil {
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if err != nil {
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fatalf("%s", err)
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fatalf("%s", err)
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}
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}
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56
src/cmd/fix/oswait.go
Normal file
56
src/cmd/fix/oswait.go
Normal file
@ -0,0 +1,56 @@
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// Copyright 2011 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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package main
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import (
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"go/ast"
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)
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func init() {
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register(oswaitFix)
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}
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var oswaitFix = fix{
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"oswait",
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"2012-02-20",
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oswait,
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`Delete options from os.Wait. If the option is the literal 0, rewrite the call.
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http://codereview.appspot.com/5688046
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`,
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}
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func oswait(f *ast.File) bool {
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if !imports(f, "os") {
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return false
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}
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fixed := false
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walk(f, func(n interface{}) {
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call, ok := n.(*ast.CallExpr)
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if !ok {
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return
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}
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if !isPkgDot(call.Fun, "os", "Wait") {
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return
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}
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args := call.Args
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const warning = "call to Process.Wait must be fixed manually"
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if len(args) != 1 {
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// Shouldn't happen, but check.
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warn(call.Pos(), warning)
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return
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}
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if basicLit, ok := args[0].(*ast.BasicLit); !ok || basicLit.Value != "0" {
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warn(call.Pos(), warning)
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return
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}
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call.Args = nil
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fixed = true
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})
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return fixed
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}
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41
src/cmd/fix/oswait_test.go
Normal file
41
src/cmd/fix/oswait_test.go
Normal file
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// Copyright 2011 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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package main
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func init() {
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addTestCases(oswaitTests, oswait)
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}
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var oswaitTests = []testCase{
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{
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Name: "oswait.0",
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In: `package main
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import (
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"os"
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)
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func f() {
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os.Wait()
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os.Wait(0)
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os.Wait(1)
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os.Wait(A | B)
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}
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`,
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Out: `package main
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import (
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"os"
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)
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func f() {
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os.Wait()
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os.Wait()
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os.Wait(1)
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os.Wait(A | B)
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}
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`,
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},
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}
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@ -103,7 +103,7 @@ func exec(rw http.ResponseWriter, args []string) (status int) {
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var buf bytes.Buffer
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var buf bytes.Buffer
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io.Copy(&buf, r)
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io.Copy(&buf, r)
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wait, err := p.Wait(0)
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wait, err := p.Wait()
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if err != nil {
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if err != nil {
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os.Stderr.Write(buf.Bytes())
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os.Stderr.Write(buf.Bytes())
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log.Printf("os.Wait(%d, 0): %v", p.Pid, err)
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log.Printf("os.Wait(%d, 0): %v", p.Pid, err)
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@ -291,7 +291,7 @@ func (c *Cmd) Wait() error {
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return errors.New("exec: Wait was already called")
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return errors.New("exec: Wait was already called")
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}
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}
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c.finished = true
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c.finished = true
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msg, err := c.Process.Wait(0)
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msg, err := c.Process.Wait()
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c.Waitmsg = msg
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c.Waitmsg = msg
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var copyError error
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var copyError error
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@ -70,9 +70,8 @@ type Waitmsg struct {
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}
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}
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// Wait waits for the Process to exit or stop, and then returns a
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// Wait waits for the Process to exit or stop, and then returns a
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// Waitmsg describing its status and an error, if any. The options
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// Waitmsg describing its status and an error, if any.
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// (WNOHANG etc.) affect the behavior of the Wait call.
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func (p *Process) Wait() (w *Waitmsg, err error) {
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func (p *Process) Wait(options int) (w *Waitmsg, err error) {
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var waitmsg syscall.Waitmsg
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var waitmsg syscall.Waitmsg
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if p.Pid == -1 {
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if p.Pid == -1 {
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@ -95,20 +94,6 @@ func (p *Process) Wait(options int) (w *Waitmsg, err error) {
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return &Waitmsg{waitmsg}, nil
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return &Waitmsg{waitmsg}, nil
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}
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}
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// Wait waits for process pid to exit or stop, and then returns a
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// Waitmsg describing its status and an error, if any. The options
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// (WNOHANG etc.) affect the behavior of the Wait call.
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// Wait is equivalent to calling FindProcess and then Wait
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// and Release on the result.
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func Wait(pid int, options int) (w *Waitmsg, err error) {
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p, e := FindProcess(pid)
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if e != nil {
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return nil, e
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}
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defer p.Release()
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return p.Wait(options)
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}
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// Release releases any resources associated with the Process.
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// Release releases any resources associated with the Process.
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func (p *Process) Release() error {
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func (p *Process) Release() error {
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// NOOP for Plan 9.
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// NOOP for Plan 9.
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@ -56,20 +56,6 @@ type Waitmsg struct {
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Rusage *syscall.Rusage // System-dependent resource usage info.
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Rusage *syscall.Rusage // System-dependent resource usage info.
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}
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}
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// Wait waits for process pid to exit or stop, and then returns a
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// Waitmsg describing its status and an error, if any. The options
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// (WNOHANG etc.) affect the behavior of the Wait call.
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// Wait is equivalent to calling FindProcess and then Wait
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// and Release on the result.
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func Wait(pid int, options int) (w *Waitmsg, err error) {
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p, e := FindProcess(pid)
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if e != nil {
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return nil, e
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}
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defer p.Release()
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return p.Wait(options)
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}
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// Convert i to decimal string.
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// Convert i to decimal string.
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func itod(i int) string {
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func itod(i int) string {
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if i == 0 {
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if i == 0 {
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@ -12,43 +12,23 @@ import (
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"syscall"
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"syscall"
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)
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)
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// Options for Wait.
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const (
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WNOHANG = syscall.WNOHANG // Don't wait if no process has exited.
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WSTOPPED = syscall.WSTOPPED // If set, status of stopped subprocesses is also reported.
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WUNTRACED = syscall.WUNTRACED // Usually an alias for WSTOPPED.
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WRUSAGE = 1 << 20 // Record resource usage.
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)
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// WRUSAGE must not be too high a bit, to avoid clashing with Linux's
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// WCLONE, WALL, and WNOTHREAD flags, which sit in the top few bits of
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// the options
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// Wait waits for the Process to exit or stop, and then returns a
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// Wait waits for the Process to exit or stop, and then returns a
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// Waitmsg describing its status and an error, if any. The options
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// Waitmsg describing its status and an error, if any.
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// (WNOHANG etc.) affect the behavior of the Wait call.
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func (p *Process) Wait() (w *Waitmsg, err error) {
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func (p *Process) Wait(options int) (w *Waitmsg, err error) {
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if p.Pid == -1 {
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if p.Pid == -1 {
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return nil, syscall.EINVAL
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return nil, syscall.EINVAL
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}
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}
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var status syscall.WaitStatus
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var status syscall.WaitStatus
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var rusage *syscall.Rusage
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pid1, e := syscall.Wait4(p.Pid, &status, 0, nil)
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if options&WRUSAGE != 0 {
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rusage = new(syscall.Rusage)
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options ^= WRUSAGE
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}
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pid1, e := syscall.Wait4(p.Pid, &status, options, rusage)
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if e != nil {
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if e != nil {
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return nil, NewSyscallError("wait", e)
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return nil, NewSyscallError("wait", e)
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}
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}
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// With WNOHANG pid is 0 if child has not exited.
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if pid1 != 0 {
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if pid1 != 0 && options&WSTOPPED == 0 {
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p.done = true
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p.done = true
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}
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}
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w = new(Waitmsg)
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w = new(Waitmsg)
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w.Pid = pid1
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w.Pid = pid1
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w.WaitStatus = status
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w.WaitStatus = status
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w.Rusage = rusage
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return w, nil
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return w, nil
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}
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}
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@ -13,7 +13,7 @@ import (
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// Wait waits for the Process to exit or stop, and then returns a
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// Wait waits for the Process to exit or stop, and then returns a
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// Waitmsg describing its status and an error, if any.
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// Waitmsg describing its status and an error, if any.
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func (p *Process) Wait(options int) (w *Waitmsg, err error) {
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func (p *Process) Wait() (w *Waitmsg, err error) {
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s, e := syscall.WaitForSingleObject(syscall.Handle(p.handle), syscall.INFINITE)
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s, e := syscall.WaitForSingleObject(syscall.Handle(p.handle), syscall.INFINITE)
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switch s {
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switch s {
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case syscall.WAIT_OBJECT_0:
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case syscall.WAIT_OBJECT_0:
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@ -541,7 +541,7 @@ func exec(t *testing.T, dir, cmd string, args []string, expect string) {
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t.Errorf("exec %q returned %q wanted %q",
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t.Errorf("exec %q returned %q wanted %q",
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strings.Join(append([]string{cmd}, args...), " "), output, expect)
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strings.Join(append([]string{cmd}, args...), " "), output, expect)
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}
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}
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p.Wait(0)
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p.Wait()
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}
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}
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func TestStartProcess(t *testing.T) {
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func TestStartProcess(t *testing.T) {
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@ -853,7 +853,7 @@ func run(t *testing.T, cmd []string) string {
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var b bytes.Buffer
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var b bytes.Buffer
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io.Copy(&b, r)
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io.Copy(&b, r)
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_, err = p.Wait(0)
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_, err = p.Wait()
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if err != nil {
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if err != nil {
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t.Fatalf("run hostname Wait: %v", err)
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t.Fatalf("run hostname Wait: %v", err)
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}
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}
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