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os: delete Exec, NewFile takes uintptr, rename ShellExpand, doc fixes

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Delete O_NDELAY, O_NONBLOCK, O_NOCTTY, O_ASYNC.

Clean up some docs.

Rename ShellExpand -> ExpandEnv.

Make NewFile take a uintptr; change File.Fd to return one.
(for API compatibility between Unix and Windows)

Fixes #2947

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5655045
This commit is contained in:
Brad Fitzpatrick 2012-02-10 14:16:15 +11:00
parent 6c0aa2f296
commit 4152b43457
15 changed files with 69 additions and 95 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
doc/go1.html
View File

@ -1353,10 +1353,19 @@ The semantic change makes it difficult for the fix tool to update automatically.
the <a href="/pkg/time/#Time"><code>Time</code></a> type from the
<code>time</code> package.</p>
<p>
<em>Updating</em>:
Code that uses <code>os.Time</code> will fail to compile and must be updated by hand.
</p>
<p>The <code>Exec</code> function has been removed; callers should use
<code>Exec</code> from the <code>syscall</code> package, where available.</p>
<p>The <code>ShellExpand</code> function has been renamed to <a
href="/pkg/os/#ExpandEnv"><code>ExpandEnv</code></a>.</p>
<p>The <a href="/pkg/os/#NewFile"><code>NewFile</code></a> function
now takes a <code>uintptr</code> fd, instead of an <code>int</code>.
The <a href="/pkg/os/#File.Fd"><code>Fd</code></a> method on files now
also returns a <code>uintptr</code>.</p>
<p><em>Updating</em>: Code will fail to compile and must be updated
by hand. </p>
<h4 id="os_fileinfo">The os.FileInfo type</h4>

17
doc/go1.tmpl
View File

@ -1256,10 +1256,19 @@ The semantic change makes it difficult for the fix tool to update automatically.
the <a href="/pkg/time/#Time"><code>Time</code></a> type from the
<code>time</code> package.</p>
<p>
<em>Updating</em>:
Code that uses <code>os.Time</code> will fail to compile and must be updated by hand.
</p>
<p>The <code>Exec</code> function has been removed; callers should use
<code>Exec</code> from the <code>syscall</code> package, where available.</p>
<p>The <code>ShellExpand</code> function has been renamed to <a
href="/pkg/os/#ExpandEnv"><code>ExpandEnv</code></a>.</p>
<p>The <a href="/pkg/os/#NewFile"><code>NewFile</code></a> function
now takes a <code>uintptr</code> fd, instead of an <code>int</code>.
The <a href="/pkg/os/#File.Fd"><code>Fd</code></a> method on files now
also returns a <code>uintptr</code>.</p>
<p><em>Updating</em>: Code will fail to compile and must be updated
by hand. </p>
<h4 id="os_fileinfo">The os.FileInfo type</h4>

10
src/pkg/net/fd.go
View File

@ -228,7 +228,7 @@ func (s *pollServer) Run() {
s.CheckDeadlines()
continue
}
if fd == s.pr.Fd() {
if fd == int(s.pr.Fd()) {
// Drain our wakeup pipe (we could loop here,
// but it's unlikely that there are more than
// len(scratch) wakeup calls).
@ -295,7 +295,7 @@ func (fd *netFD) setAddr(laddr, raddr Addr) {
if raddr != nil {
rs = raddr.String()
}
fd.sysfile = os.NewFile(fd.sysfd, fd.net+":"+ls+"->"+rs)
fd.sysfile = os.NewFile(uintptr(fd.sysfd), fd.net+":"+ls+"->"+rs)
}
func (fd *netFD) connect(ra syscall.Sockaddr) error {
@ -382,7 +382,7 @@ func (fd *netFD) Read(p []byte) (n int, err error) {
return 0, os.EINVAL
}
for {
n, err = syscall.Read(fd.sysfile.Fd(), p)
n, err = syscall.Read(int(fd.sysfile.Fd()), p)
if err == syscall.EAGAIN {
if fd.rdeadline >= 0 {
pollserver.WaitRead(fd)
@ -476,7 +476,7 @@ func (fd *netFD) Write(p []byte) (int, error) {
nn := 0
for {
var n int
n, err = syscall.Write(fd.sysfile.Fd(), p[nn:])
n, err = syscall.Write(int(fd.sysfile.Fd()), p[nn:])
if n > 0 {
nn += n
}
@ -615,7 +615,7 @@ func (fd *netFD) dup() (f *os.File, err error) {
return nil, &OpError{"setnonblock", fd.net, fd.laddr, err}
}
return os.NewFile(ns, fd.sysfile.Name()), nil
return os.NewFile(uintptr(ns), fd.sysfile.Name()), nil
}
func closesocket(s int) error {

2
src/pkg/net/file.go
View File

@ -12,7 +12,7 @@ import (
)
func newFileFD(f *os.File) (*netFD, error) {
fd, err := syscall.Dup(f.Fd())
fd, err := syscall.Dup(int(f.Fd()))
if err != nil {
return nil, os.NewSyscallError("dup", err)
}

6
src/pkg/net/newpollserver.go
View File

@ -18,16 +18,16 @@ func newPollServer() (s *pollServer, err error) {
if s.pr, s.pw, err = os.Pipe(); err != nil {
return nil, err
}
if err = syscall.SetNonblock(s.pr.Fd(), true); err != nil {
if err = syscall.SetNonblock(int(s.pr.Fd()), true); err != nil {
goto Errno
}
if err = syscall.SetNonblock(s.pw.Fd(), true); err != nil {
if err = syscall.SetNonblock(int(s.pw.Fd()), true); err != nil {
goto Errno
}
if s.poll, err = newpollster(); err != nil {
goto Error
}
if _, err = s.poll.AddFD(s.pr.Fd(), 'r', true); err != nil {
if _, err = s.poll.AddFD(int(s.pr.Fd()), 'r', true); err != nil {
s.poll.Close()
goto Error
}

2
src/pkg/net/sendfile_linux.go
View File

@ -42,7 +42,7 @@ func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
defer c.decref()
dst := c.sysfd
src := f.Fd()
src := int(f.Fd())
for remain > 0 {
n := maxSendfileSize
if int64(n) > remain {

8
src/pkg/os/env.go
View File

@ -29,10 +29,10 @@ func Expand(s string, mapping func(string) string) string {
return string(buf) + s[i:]
}
// ShellExpand replaces ${var} or $var in the string according to the values
// of the operating system's environment variables. References to undefined
// ExpandEnv replaces ${var} or $var in the string according to the values
// of the current environment variables. References to undefined
// variables are replaced by the empty string.
func ShellExpand(s string) string {
func ExpandEnv(s string) string {
return Expand(s, Getenv)
}
@ -115,7 +115,7 @@ func Clearenv() {
syscall.Clearenv()
}
// Environ returns an array of strings representing the environment,
// Environ returns a copy of strings representing the environment,
// in the form "key=value".
func Environ() []string {
return syscall.Environ()

1
src/pkg/os/error_posix.go
View File

@ -15,7 +15,6 @@ var (
ESRCH error = syscall.ESRCH
EINTR error = syscall.EINTR
EIO error = syscall.EIO
ENXIO error = syscall.ENXIO
E2BIG error = syscall.E2BIG
ENOEXEC error = syscall.ENOEXEC
EBADF error = syscall.EBADF

2
src/pkg/os/exec/exec_test.go
View File

@ -153,7 +153,7 @@ func TestExtraFiles(t *testing.T) {
// Ensure that file descriptors have not already been leaked into
// our environment.
for fd := os.Stderr.Fd() + 1; fd <= 101; fd++ {
for fd := int(os.Stderr.Fd()) + 1; fd <= 101; fd++ {
err := syscall.Close(fd)
if err == nil {
t.Logf("Something already leaked - closed fd %d", fd)

14
src/pkg/os/exec_plan9.go
View File

@ -72,20 +72,6 @@ func (p *Process) Kill() error {
return e
}
// Exec replaces the current process with an execution of the
// named binary, with arguments argv and environment envv.
// If successful, Exec never returns. If it fails, it returns an error.
// ForkExec is almost always a better way to execute a program.
// If there is an error, it will be of type *PathError.
func Exec(name string, argv []string, envv []string) error {
e := syscall.Exec(name, argv, envv)
if e != nil {
return &PathError{"exec", name, e}
}
return nil
}
// Waitmsg stores the information about an exited process as reported by Wait.
type Waitmsg struct {
syscall.Waitmsg

21
src/pkg/os/exec_posix.go
View File

@ -38,7 +38,7 @@ func StartProcess(name string, argv []string, attr *ProcAttr) (p *Process, err e
sysattr.Env = Environ()
}
for _, f := range attr.Files {
sysattr.Files = append(sysattr.Files, f.Fd())
sysattr.Files = append(sysattr.Files, int(f.Fd()))
}
pid, h, e := syscall.StartProcess(name, argv, sysattr)
@ -53,25 +53,6 @@ func (p *Process) Kill() error {
return p.Signal(UnixSignal(syscall.SIGKILL))
}
// Exec replaces the current process with an execution of the
// named binary, with arguments argv and environment envv.
// If successful, Exec never returns. If it fails, it returns an error.
//
// To run a child process, see StartProcess (for a low-level interface)
// or the os/exec package (for higher-level interfaces).
//
// If there is an error, it will be of type *PathError.
func Exec(name string, argv []string, envv []string) error {
if envv == nil {
envv = Environ()
}
e := syscall.Exec(name, argv, envv)
if e != nil {
return &PathError{"exec", name, e}
}
return nil
}
// TODO(rsc): Should os implement its own syscall.WaitStatus
// wrapper with the methods, or is exposing the underlying one enough?
//

26
src/pkg/os/file.go
View File

@ -25,26 +25,22 @@ func (f *File) Name() string { return f.name }
// Stdin, Stdout, and Stderr are open Files pointing to the standard input,
// standard output, and standard error file descriptors.
var (
Stdin = NewFile(syscall.Stdin, "/dev/stdin")
Stdout = NewFile(syscall.Stdout, "/dev/stdout")
Stderr = NewFile(syscall.Stderr, "/dev/stderr")
Stdin = NewFile(uintptr(syscall.Stdin), "/dev/stdin")
Stdout = NewFile(uintptr(syscall.Stdout), "/dev/stdout")
Stderr = NewFile(uintptr(syscall.Stderr), "/dev/stderr")
)
// Flags to Open wrapping those of the underlying system. Not all flags
// may be implemented on a given system.
const (
O_RDONLY int = syscall.O_RDONLY // open the file read-only.
O_WRONLY int = syscall.O_WRONLY // open the file write-only.
O_RDWR int = syscall.O_RDWR // open the file read-write.
O_APPEND int = syscall.O_APPEND // append data to the file when writing.
O_ASYNC int = syscall.O_ASYNC // generate a signal when I/O is available.
O_CREATE int = syscall.O_CREAT // create a new file if none exists.
O_EXCL int = syscall.O_EXCL // used with O_CREATE, file must not exist
O_NOCTTY int = syscall.O_NOCTTY // do not make file the controlling tty.
O_NONBLOCK int = syscall.O_NONBLOCK // open in non-blocking mode.
O_NDELAY int = O_NONBLOCK // synonym for O_NONBLOCK
O_SYNC int = syscall.O_SYNC // open for synchronous I/O.
O_TRUNC int = syscall.O_TRUNC // if possible, truncate file when opened.
O_RDONLY int = syscall.O_RDONLY // open the file read-only.
O_WRONLY int = syscall.O_WRONLY // open the file write-only.
O_RDWR int = syscall.O_RDWR // open the file read-write.
O_APPEND int = syscall.O_APPEND // append data to the file when writing.
O_CREATE int = syscall.O_CREAT // create a new file if none exists.
O_EXCL int = syscall.O_EXCL // used with O_CREATE, file must not exist
O_SYNC int = syscall.O_SYNC // open for synchronous I/O.
O_TRUNC int = syscall.O_TRUNC // if possible, truncate file when opened.
)
// Seek whence values.

21
src/pkg/os/file_unix.go
View File

@ -28,19 +28,20 @@ type file struct {
}
// Fd returns the integer Unix file descriptor referencing the open file.
func (f *File) Fd() int {
func (f *File) Fd() uintptr {
if f == nil {
return -1
return ^(uintptr(0))
}
return f.fd
return uintptr(f.fd)
}
// NewFile returns a new File with the given file descriptor and name.
func NewFile(fd int, name string) *File {
if fd < 0 {
func NewFile(fd uintptr, name string) *File {
fdi := int(fd)
if fdi < 0 {
return nil
}
f := &File{&file{fd: fd, name: name}}
f := &File{&file{fd: fdi, name: name}}
runtime.SetFinalizer(f.file, (*file).close)
return f
}
@ -78,7 +79,7 @@ func OpenFile(name string, flag int, perm FileMode) (file *File, err error) {
syscall.CloseOnExec(r)
}
return NewFile(r, name), nil
return NewFile(uintptr(r), name), nil
}
// Close closes the File, rendering it unusable for I/O.
@ -114,10 +115,6 @@ func (f *File) Stat() (fi FileInfo, err error) {
}
// Stat returns a FileInfo describing the named file.
// If name names a valid symbolic link, the returned FileInfo describes
// the file pointed at by the link and has fi.FollowedSymlink set to true.
// If name names an invalid symbolic link, the returned FileInfo describes
// the link itself and has fi.FollowedSymlink set to false.
// If there is an error, it will be of type *PathError.
func Stat(name string) (fi FileInfo, err error) {
var stat syscall.Stat_t
@ -268,7 +265,7 @@ func Pipe() (r *File, w *File, err error) {
syscall.CloseOnExec(p[1])
syscall.ForkLock.RUnlock()
return NewFile(p[0], "|0"), NewFile(p[1], "|1"), nil
return NewFile(uintptr(p[0]), "|0"), NewFile(uintptr(p[1]), "|1"), nil
}
// TempDir returns the default directory to use for temporary files.

13
src/pkg/os/file_windows.go
View File

@ -30,19 +30,20 @@ type file struct {
}
// Fd returns the Windows handle referencing the open file.
func (file *File) Fd() syscall.Handle {
func (file *File) Fd() uintptr {
if file == nil {
return syscall.InvalidHandle
return uintptr(syscall.InvalidHandle)
}
return file.fd
return uintptr(file.fd)
}
// NewFile returns a new File with the given file descriptor and name.
func NewFile(fd syscall.Handle, name string) *File {
if fd == syscall.InvalidHandle {
func NewFile(fd uintptr, name string) *File {
h := syscall.Handle(fd)
if h == syscall.InvalidHandle {
return nil
}
f := &File{&file{fd: fd, name: name}}
f := &File{&file{fd: h, name: name}}
runtime.SetFinalizer(f.file, (*file).close)
return f
}

4
src/pkg/os/stat_windows.go
View File

@ -29,10 +29,6 @@ func (file *File) Stat() (fi FileInfo, err error) {
}
// Stat returns a FileInfo structure describing the named file.
// If name names a valid symbolic link, the returned FileInfo describes
// the file pointed at by the link and has fi.FollowedSymlink set to true.
// If name names an invalid symbolic link, the returned FileInfo describes
// the link itself and has fi.FollowedSymlink set to false.
// If there is an error, it will be of type *PathError.
func Stat(name string) (fi FileInfo, err error) {
if len(name) == 0 {