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//go:build darwin || (linux && !baremetal)
// target wasi sets GOOS=linux and thus the +linux build tag,
// even though it doesn't show up in "tinygo info target -wasi"
// Portions 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.
package os
import (
"io"
"syscall"
)
const DevNull = "/dev/null"
type syscallFd = int
// fixLongPath is a noop on non-Windows platforms.
func fixLongPath(path string) string {
return path
}
func rename(oldname, newname string) error {
// TODO: import rest of upstream tests, handle fancy cases
err := syscall.Rename(oldname, newname)
if err != nil {
return &LinkError{"rename", oldname, newname, err}
}
return nil
}
// file is the real representation of *File.
// The extra level of indirection ensures that no clients of os
// can overwrite this data, which could cause the finalizer
// to close the wrong file descriptor.
type file struct {
handle FileHandle
name string
dirinfo *dirInfo // nil unless directory being read
appendMode bool
}
func (f *file) close() (err error) {
if f.dirinfo != nil {
f.dirinfo.close()
f.dirinfo = nil
}
return f.handle.Close()
}
func NewFile(fd uintptr, name string) *File {
return &File{&file{handle: unixFileHandle(fd), name: name}}
}
func Pipe() (r *File, w *File, err error) {
var p [2]int
err = handleSyscallError(syscall.Pipe2(p[:], syscall.O_CLOEXEC))
if err != nil {
return
}
r = NewFile(uintptr(p[0]), "|0")
w = NewFile(uintptr(p[1]), "|1")
return
}
func tempDir() string {
dir := Getenv("TMPDIR")
if dir == "" {
dir = "/tmp"
}
return dir
}
// Symlink creates newname as a symbolic link to oldname.
// On Windows, a symlink to a non-existent oldname creates a file symlink;
// if oldname is later created as a directory the symlink will not work.
// If there is an error, it will be of type *LinkError.
func Symlink(oldname, newname string) error {
e := ignoringEINTR(func() error {
return syscall.Symlink(oldname, newname)
})
if e != nil {
return &LinkError{"symlink", oldname, newname, e}
}
return nil
}
// Readlink returns the destination of the named symbolic link.
// If there is an error, it will be of type *PathError.
func Readlink(name string) (string, error) {
for len := 128; ; len *= 2 {
b := make([]byte, len)
var (
n int
e error
)
for {
n, e = fixCount(syscall.Readlink(name, b))
if e != syscall.EINTR {
break
}
}
if e != nil {
return "", &PathError{Op: "readlink", Path: name, Err: e}
}
if n < len {
return string(b[0:n]), nil
}
}
}
// ReadAt reads up to len(b) bytes from the File starting at the given absolute offset.
// It returns the number of bytes read and any error encountered, possibly io.EOF.
// At end of file, Pread returns 0, io.EOF.
// TODO: move to file_anyos once ReadAt is implemented for windows
func (f unixFileHandle) ReadAt(b []byte, offset int64) (n int, err error) {
n, err = syscall.Pread(syscallFd(f), b, offset)
err = handleSyscallError(err)
if n == 0 && len(b) > 0 && err == nil {
err = io.EOF
}
return
}
// WriteAt writes len(b) bytes to the File starting at byte offset off.
// It returns the number of bytes written and an error, if any.
// WriteAt returns a non-nil error when n != len(b).
//
// If file was opened with the O_APPEND flag, WriteAt returns an error.
//
// TODO: move to file_anyos once WriteAt is implemented for windows.
func (f unixFileHandle) WriteAt(b []byte, offset int64) (int, error) {
n, err := syscall.Pwrite(syscallFd(f), b, offset)
return n, handleSyscallError(err)
}
// Seek wraps syscall.Seek.
func (f unixFileHandle) Seek(offset int64, whence int) (int64, error) {
newoffset, err := syscall.Seek(syscallFd(f), offset, whence)
return newoffset, handleSyscallError(err)
}
func (f unixFileHandle) Sync() error {
err := syscall.Fsync(syscallFd(f))
return handleSyscallError(err)
}
type unixDirent struct {
parent string
name string
typ FileMode
info FileInfo
}
func (d *unixDirent) Name() string { return d.name }
func (d *unixDirent) IsDir() bool { return d.typ.IsDir() }
func (d *unixDirent) Type() FileMode { return d.typ }
func (d *unixDirent) Info() (FileInfo, error) {
if d.info != nil {
return d.info, nil
}
return lstat(d.parent + "/" + d.name)
}
func newUnixDirent(parent, name string, typ FileMode) (DirEntry, error) {
ude := &unixDirent{
parent: parent,
name: name,
typ: typ,
}
if typ != ^FileMode(0) && !testingForceReadDirLstat {
return ude, nil
}
info, err := lstat(parent + "/" + name)
if err != nil {
return nil, err
}
ude.typ = info.Mode().Type()
ude.info = info
return ude, nil
}
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