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