patch: os.File

internal/lib/os/file.go

@@ -8,6 +8,7 @@ import (
 	"errors"
 	"io"
 	"syscall"
+	"time"
 )
 
 // Name returns the name of the file as presented to Open.
@@ -172,36 +173,42 @@ func (f *File) WriteAt(b []byte, off int64) (n int, err error) {
 		}
 		return
 	*/
-	panic("todo")
+	panic("todo: os.(*File).WriteAt")
 }
 
-/*
 // Seek sets the offset for the next Read or Write on file to offset, interpreted
 // according to whence: 0 means relative to the origin of the file, 1 means
 // relative to the current offset, and 2 means relative to the end.
 // It returns the new offset and an error, if any.
 // The behavior of Seek on a file opened with O_APPEND is not specified.
 func (f *File) Seek(offset int64, whence int) (ret int64, err error) {
-	if err := f.checkValid("seek"); err != nil {
-		return 0, err
-	}
-	r, e := f.seek(offset, whence)
-	if e == nil && f.dirinfo != nil && r != 0 {
-		e = syscall.EISDIR
-	}
-	if e != nil {
-		return 0, f.wrapErr("seek", e)
-	}
-	return r, nil
+	/*
+		if err := f.checkValid("seek"); err != nil {
+			return 0, err
+		}
+		r, e := f.seek(offset, whence)
+		if e == nil && f.dirinfo != nil && r != 0 {
+			e = syscall.EISDIR
+		}
+		if e != nil {
+			return 0, f.wrapErr("seek", e)
+		}
+		return r, nil
+	*/
+	panic("todo: os.(*File).Seek")
 }
 
 // WriteString is like Write, but writes the contents of string s rather than
 // a slice of bytes.
 func (f *File) WriteString(s string) (n int, err error) {
-	b := unsafe.Slice(unsafe.StringData(s), len(s))
-	return f.Write(b)
+	/*
+		b := unsafe.Slice(unsafe.StringData(s), len(s))
+		return f.Write(b)
+	*/
+	panic("todo: os.(*File).WriteString")
 }
 
+/*
 // setStickyBit adds ModeSticky to the permission bits of path, non atomic.
 func setStickyBit(name string) error {
 	fi, err := Stat(name)
@@ -293,6 +300,7 @@ func (f *File) wrapErr(op string, err error) error {
 func TempDir() string {
 	return tempDir()
 }
+*/
 
 // Chmod changes the mode of the file to mode.
 // If there is an error, it will be of type *PathError.
@@ -347,12 +355,16 @@ func (f *File) SetWriteDeadline(t time.Time) error {
 // SyscallConn returns a raw file.
 // This implements the syscall.Conn interface.
 func (f *File) SyscallConn() (syscall.RawConn, error) {
-	if err := f.checkValid("SyscallConn"); err != nil {
-		return nil, err
-	}
-	return newRawConn(f)
+	/*
+		if err := f.checkValid("SyscallConn"); err != nil {
+			return nil, err
+		}
+		return newRawConn(f)
+	*/
+	panic("todo: os.(*File).SyscallConn")
 }
 
+/* TODO(xsw):
 // DirFS returns a file system (an fs.FS) for the tree of files rooted at the directory dir.
 //
 // Note that DirFS("/prefix") only guarantees that the Open calls it makes to the

internal/lib/os/file_posix.go

@@ -0,0 +1,243 @@
+// 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.
+
+//go:build unix || (js && wasm) || wasip1 || windows
+
+package os
+
+import (
+	"syscall"
+	"time"
+)
+
+// Close closes the File, rendering it unusable for I/O.
+// On files that support SetDeadline, any pending I/O operations will
+// be canceled and return immediately with an ErrClosed error.
+// Close will return an error if it has already been called.
+func (f *File) Close() error {
+	/*
+		if f == nil {
+			return ErrInvalid
+		}
+		return f.file.close()
+	*/
+	panic("todo: os.(*File).Close")
+}
+
+// pread reads len(b) bytes from the File starting at byte offset off.
+// It returns the number of bytes read and the error, if any.
+// EOF is signaled by a zero count with err set to nil.
+func (f *File) pread(b []byte, off int64) (n int, err error) {
+	/*
+		n, err = f.pfd.Pread(b, off)
+		runtime.KeepAlive(f)
+		return n, err
+	*/
+	panic("todo: os.(*File).pread")
+}
+
+// pwrite writes len(b) bytes to the File starting at byte offset off.
+// It returns the number of bytes written and an error, if any.
+func (f *File) pwrite(b []byte, off int64) (n int, err error) {
+	/*
+		n, err = f.pfd.Pwrite(b, off)
+		runtime.KeepAlive(f)
+		return n, err
+	*/
+	panic("todo: os.(*File).pwrite")
+}
+
+/*
+// syscallMode returns the syscall-specific mode bits from Go's portable mode bits.
+func syscallMode(i FileMode) (o uint32) {
+	o |= uint32(i.Perm())
+	if i&ModeSetuid != 0 {
+		o |= syscall.S_ISUID
+	}
+	if i&ModeSetgid != 0 {
+		o |= syscall.S_ISGID
+	}
+	if i&ModeSticky != 0 {
+		o |= syscall.S_ISVTX
+	}
+	// No mapping for Go's ModeTemporary (plan9 only).
+	return
+}
+
+// See docs in file.go:Chmod.
+func chmod(name string, mode FileMode) error {
+	longName := fixLongPath(name)
+	e := ignoringEINTR(func() error {
+		return syscall.Chmod(longName, syscallMode(mode))
+	})
+	if e != nil {
+		return &PathError{Op: "chmod", Path: name, Err: e}
+	}
+	return nil
+}
+*/
+
+// See docs in file.go:(*File).Chmod.
+func (f *File) chmod(mode FileMode) error {
+	/*
+		if err := f.checkValid("chmod"); err != nil {
+			return err
+		}
+		if e := f.pfd.Fchmod(syscallMode(mode)); e != nil {
+			return f.wrapErr("chmod", e)
+		}
+		return nil
+	*/
+	panic("todo: os.(*File).chmod")
+}
+
+// Chown changes the numeric uid and gid of the named file.
+// If there is an error, it will be of type *PathError.
+//
+// On Windows, it always returns the syscall.EWINDOWS error, wrapped
+// in *PathError.
+func (f *File) Chown(uid, gid int) error {
+	/*
+		if err := f.checkValid("chown"); err != nil {
+			return err
+		}
+		if e := f.pfd.Fchown(uid, gid); e != nil {
+			return f.wrapErr("chown", e)
+		}
+		return nil
+	*/
+	panic("todo: os.(*File).Chown")
+}
+
+// Truncate changes the size of the file.
+// It does not change the I/O offset.
+// If there is an error, it will be of type *PathError.
+func (f *File) Truncate(size int64) error {
+	/*
+		if err := f.checkValid("truncate"); err != nil {
+			return err
+		}
+		if e := f.pfd.Ftruncate(size); e != nil {
+			return f.wrapErr("truncate", e)
+		}
+		return nil
+	*/
+	panic("todo: os.(*File).Truncate")
+}
+
+// Sync commits the current contents of the file to stable storage.
+// Typically, this means flushing the file system's in-memory copy
+// of recently written data to disk.
+func (f *File) Sync() error {
+	/*
+		if err := f.checkValid("sync"); err != nil {
+			return err
+		}
+		if e := f.pfd.Fsync(); e != nil {
+			return f.wrapErr("sync", e)
+		}
+		return nil
+	*/
+	panic("todo: os.(*File).Sync")
+}
+
+/*
+// Chtimes changes the access and modification times of the named
+// file, similar to the Unix utime() or utimes() functions.
+// A zero time.Time value will leave the corresponding file time unchanged.
+//
+// The underlying filesystem may truncate or round the values to a
+// less precise time unit.
+// If there is an error, it will be of type *PathError.
+func Chtimes(name string, atime time.Time, mtime time.Time) error {
+	var utimes [2]syscall.Timespec
+	set := func(i int, t time.Time) {
+		if t.IsZero() {
+			utimes[i] = syscall.Timespec{Sec: _UTIME_OMIT, Nsec: _UTIME_OMIT}
+		} else {
+			utimes[i] = syscall.NsecToTimespec(t.UnixNano())
+		}
+	}
+	set(0, atime)
+	set(1, mtime)
+	if e := syscall.UtimesNano(fixLongPath(name), utimes[0:]); e != nil {
+		return &PathError{Op: "chtimes", Path: name, Err: e}
+	}
+	return nil
+}
+*/
+
+// Chdir changes the current working directory to the file,
+// which must be a directory.
+// If there is an error, it will be of type *PathError.
+func (f *File) Chdir() error {
+	/*
+		if err := f.checkValid("chdir"); err != nil {
+			return err
+		}
+		if e := f.pfd.Fchdir(); e != nil {
+			return f.wrapErr("chdir", e)
+		}
+		return nil
+	*/
+	panic("todo: os.(*File).Chdir")
+}
+
+// setDeadline sets the read and write deadline.
+func (f *File) setDeadline(t time.Time) error {
+	/*
+		if err := f.checkValid("SetDeadline"); err != nil {
+			return err
+		}
+		return f.pfd.SetDeadline(t)
+	*/
+	panic("todo: os.(*File).setDeadline")
+}
+
+// setReadDeadline sets the read deadline.
+func (f *File) setReadDeadline(t time.Time) error {
+	/*
+		if err := f.checkValid("SetReadDeadline"); err != nil {
+			return err
+		}
+		return f.pfd.SetReadDeadline(t)
+	*/
+	panic("todo: os.(*File).setReadDeadline")
+}
+
+// setWriteDeadline sets the write deadline.
+func (f *File) setWriteDeadline(t time.Time) error {
+	/*
+		if err := f.checkValid("SetWriteDeadline"); err != nil {
+			return err
+		}
+		return f.pfd.SetWriteDeadline(t)
+	*/
+	panic("todo: os.(*File).setWriteDeadline")
+}
+
+// checkValid checks whether f is valid for use.
+// If not, it returns an appropriate error, perhaps incorporating the operation name op.
+func (f *File) checkValid(op string) error {
+	if f == nil {
+		return ErrInvalid
+	}
+	return nil
+}
+
+// ignoringEINTR makes a function call and repeats it if it returns an
+// EINTR error. This appears to be required even though we install all
+// signal handlers with SA_RESTART: see #22838, #38033, #38836, #40846.
+// Also #20400 and #36644 are issues in which a signal handler is
+// installed without setting SA_RESTART. None of these are the common case,
+// but there are enough of them that it seems that we can't avoid
+// an EINTR loop.
+func ignoringEINTR(fn func() error) error {
+	for {
+		err := fn()
+		if err != syscall.EINTR {
+			return err
+		}
+	}
+}

internal/lib/os/os.go

@@ -120,6 +120,25 @@ func Chown(name string, uid, gid int) error {
 	return toPathErr("chown", name, ret)
 }
 
+/* TODO(xsw):
+// Chown changes the numeric uid and gid of the named file.
+// If the file is a symbolic link, it changes the uid and gid of the link's target.
+// A uid or gid of -1 means to not change that value.
+// If there is an error, it will be of type *PathError.
+//
+// On Windows or Plan 9, Chown always returns the syscall.EWINDOWS or
+// EPLAN9 error, wrapped in *PathError.
+func Chown(name string, uid, gid int) error {
+	e := ignoringEINTR(func() error {
+		return syscall.Chown(name, uid, gid)
+	})
+	if e != nil {
+		return &PathError{Op: "chown", Path: name, Err: e}
+	}
+	return nil
+}
+*/
+
 // TODO(xsw):
 // func Chtimes(name string, atime time.Time, mtime time.Time) error
 
@@ -195,6 +214,24 @@ func Lchown(name string, uid, gid int) error {
 	return toPathErr("lchown", name, ret)
 }
 
+/* TODO(xsw):
+// Lchown changes the numeric uid and gid of the named file.
+// If the file is a symbolic link, it changes the uid and gid of the link itself.
+// If there is an error, it will be of type *PathError.
+//
+// On Windows, it always returns the syscall.EWINDOWS error, wrapped
+// in *PathError.
+func Lchown(name string, uid, gid int) error {
+	e := ignoringEINTR(func() error {
+		return syscall.Lchown(name, uid, gid)
+	})
+	if e != nil {
+		return &PathError{Op: "lchown", Path: name, Err: e}
+	}
+	return nil
+}
+*/
+
 func Link(oldname, newname string) error {
 	ret := os.Link(c.AllocaCStr(oldname), c.AllocaCStr(newname))
 	if ret == 0 {

internal/lib/os/types.go

@@ -47,6 +47,16 @@ func (f *File) write(b []byte) (int, error) {
 	return 0, syscall.Errno(os.Errno)
 }
 
+/* TODO(xsw):
+// write writes len(b) bytes to the File.
+// It returns the number of bytes written and an error, if any.
+func (f *File) write(b []byte) (n int, err error) {
+	n, err = f.pfd.Write(b)
+	runtime.KeepAlive(f)
+	return n, err
+}
+*/
+
 // read reads up to len(b) bytes from the File.
 // It returns the number of bytes read and an error, if any.
 func (f *File) read(b []byte) (int, error) {
@@ -60,14 +70,15 @@ func (f *File) read(b []byte) (int, error) {
 	return 0, syscall.Errno(os.Errno)
 }
 
-// checkValid checks whether f is valid for use.
-// If not, it returns an appropriate error, perhaps incorporating the operation name op.
-func (f *File) checkValid(op string) error {
-	if f == nil {
-		return ErrInvalid
-	}
-	return nil
+/* TODO(xsw):
+// read reads up to len(b) bytes from the File.
+// It returns the number of bytes read and an error, if any.
+func (f *File) read(b []byte) (n int, err error) {
+	n, err = f.pfd.Read(b)
+	runtime.KeepAlive(f)
+	return n, err
 }
+*/
 
 // A FileInfo describes a file and is returned by Stat and Lstat.
 type FileInfo = fs.FileInfo