152 lines
3.8 KiB
Go
152 lines
3.8 KiB
Go
package sys
|
|
|
|
import (
|
|
experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
|
|
"github.com/tetratelabs/wazero/internal/fsapi"
|
|
"github.com/tetratelabs/wazero/sys"
|
|
)
|
|
|
|
// compile-time check to ensure lazyDir implements sys.File.
|
|
var _ experimentalsys.File = (*lazyDir)(nil)
|
|
|
|
type lazyDir struct {
|
|
experimentalsys.DirFile
|
|
|
|
fs experimentalsys.FS
|
|
f experimentalsys.File
|
|
}
|
|
|
|
// Dev implements the same method as documented on sys.File
|
|
func (d *lazyDir) Dev() (uint64, experimentalsys.Errno) {
|
|
if f, ok := d.file(); !ok {
|
|
return 0, experimentalsys.EBADF
|
|
} else {
|
|
return f.Dev()
|
|
}
|
|
}
|
|
|
|
// Ino implements the same method as documented on sys.File
|
|
func (d *lazyDir) Ino() (sys.Inode, experimentalsys.Errno) {
|
|
if f, ok := d.file(); !ok {
|
|
return 0, experimentalsys.EBADF
|
|
} else {
|
|
return f.Ino()
|
|
}
|
|
}
|
|
|
|
// IsDir implements the same method as documented on sys.File
|
|
func (d *lazyDir) IsDir() (bool, experimentalsys.Errno) {
|
|
// Note: we don't return a constant because we don't know if this is really
|
|
// backed by a dir, until the first call.
|
|
if f, ok := d.file(); !ok {
|
|
return false, experimentalsys.EBADF
|
|
} else {
|
|
return f.IsDir()
|
|
}
|
|
}
|
|
|
|
// IsAppend implements the same method as documented on sys.File
|
|
func (d *lazyDir) IsAppend() bool {
|
|
return false
|
|
}
|
|
|
|
// SetAppend implements the same method as documented on sys.File
|
|
func (d *lazyDir) SetAppend(bool) experimentalsys.Errno {
|
|
return experimentalsys.EISDIR
|
|
}
|
|
|
|
// Seek implements the same method as documented on sys.File
|
|
func (d *lazyDir) Seek(offset int64, whence int) (newOffset int64, errno experimentalsys.Errno) {
|
|
if f, ok := d.file(); !ok {
|
|
return 0, experimentalsys.EBADF
|
|
} else {
|
|
return f.Seek(offset, whence)
|
|
}
|
|
}
|
|
|
|
// Stat implements the same method as documented on sys.File
|
|
func (d *lazyDir) Stat() (sys.Stat_t, experimentalsys.Errno) {
|
|
if f, ok := d.file(); !ok {
|
|
return sys.Stat_t{}, experimentalsys.EBADF
|
|
} else {
|
|
return f.Stat()
|
|
}
|
|
}
|
|
|
|
// Readdir implements the same method as documented on sys.File
|
|
func (d *lazyDir) Readdir(n int) (dirents []experimentalsys.Dirent, errno experimentalsys.Errno) {
|
|
if f, ok := d.file(); !ok {
|
|
return nil, experimentalsys.EBADF
|
|
} else {
|
|
return f.Readdir(n)
|
|
}
|
|
}
|
|
|
|
// Sync implements the same method as documented on sys.File
|
|
func (d *lazyDir) Sync() experimentalsys.Errno {
|
|
if f, ok := d.file(); !ok {
|
|
return experimentalsys.EBADF
|
|
} else {
|
|
return f.Sync()
|
|
}
|
|
}
|
|
|
|
// Datasync implements the same method as documented on sys.File
|
|
func (d *lazyDir) Datasync() experimentalsys.Errno {
|
|
if f, ok := d.file(); !ok {
|
|
return experimentalsys.EBADF
|
|
} else {
|
|
return f.Datasync()
|
|
}
|
|
}
|
|
|
|
// Utimens implements the same method as documented on sys.File
|
|
func (d *lazyDir) Utimens(atim, mtim int64) experimentalsys.Errno {
|
|
if f, ok := d.file(); !ok {
|
|
return experimentalsys.EBADF
|
|
} else {
|
|
return f.Utimens(atim, mtim)
|
|
}
|
|
}
|
|
|
|
// file returns the underlying file or false if it doesn't exist.
|
|
func (d *lazyDir) file() (experimentalsys.File, bool) {
|
|
if f := d.f; d.f != nil {
|
|
return f, true
|
|
}
|
|
var errno experimentalsys.Errno
|
|
d.f, errno = d.fs.OpenFile(".", experimentalsys.O_RDONLY, 0)
|
|
switch errno {
|
|
case 0:
|
|
return d.f, true
|
|
case experimentalsys.ENOENT:
|
|
return nil, false
|
|
default:
|
|
panic(errno) // unexpected
|
|
}
|
|
}
|
|
|
|
// Close implements fs.File
|
|
func (d *lazyDir) Close() experimentalsys.Errno {
|
|
f := d.f
|
|
if f == nil {
|
|
return 0 // never opened
|
|
}
|
|
return f.Close()
|
|
}
|
|
|
|
// IsNonblock implements the same method as documented on fsapi.File
|
|
func (d *lazyDir) IsNonblock() bool {
|
|
return false
|
|
}
|
|
|
|
// SetNonblock implements the same method as documented on fsapi.File
|
|
func (d *lazyDir) SetNonblock(bool) experimentalsys.Errno {
|
|
return experimentalsys.EISDIR
|
|
}
|
|
|
|
// Poll implements the same method as documented on fsapi.File
|
|
func (d *lazyDir) Poll(fsapi.Pflag, int32) (ready bool, errno experimentalsys.Errno) {
|
|
return false, experimentalsys.ENOSYS
|
|
}
|