93 lines
2.4 KiB
Go
93 lines
2.4 KiB
Go
package sys
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import (
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"fmt"
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"io/fs"
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"github.com/tetratelabs/wazero/sys"
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)
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// FileType is fs.FileMode masked on fs.ModeType. For example, zero is a
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// regular file, fs.ModeDir is a directory and fs.ModeIrregular is unknown.
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//
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// Note: This is defined by Linux, not POSIX.
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type FileType = fs.FileMode
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// Dirent is an entry read from a directory via File.Readdir.
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//
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// # Notes
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//
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// - This extends `dirent` defined in POSIX with some fields defined by
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// Linux. See https://man7.org/linux/man-pages/man3/readdir.3.html and
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// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/dirent.h.html
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// - This has a subset of fields defined in sys.Stat_t. Notably, there is no
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// field corresponding to Stat_t.Dev because that value will be constant
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// for all files in a directory. To get the Dev value, call File.Stat on
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// the directory File.Readdir was called on.
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type Dirent struct {
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// Ino is the file serial number, or zero if not available. See Ino for
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// more details including impact returning a zero value.
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Ino sys.Inode
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// Name is the base name of the directory entry. Empty is invalid.
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Name string
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// Type is fs.FileMode masked on fs.ModeType. For example, zero is a
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// regular file, fs.ModeDir is a directory and fs.ModeIrregular is unknown.
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//
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// Note: This is defined by Linux, not POSIX.
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Type fs.FileMode
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}
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func (d *Dirent) String() string {
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return fmt.Sprintf("name=%s, type=%v, ino=%d", d.Name, d.Type, d.Ino)
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}
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// IsDir returns true if the Type is fs.ModeDir.
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func (d *Dirent) IsDir() bool {
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return d.Type == fs.ModeDir
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}
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// DirFile is embeddable to reduce the amount of functions to implement a file.
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type DirFile struct{}
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// IsAppend implements File.IsAppend
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func (DirFile) IsAppend() bool {
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return false
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}
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// SetAppend implements File.SetAppend
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func (DirFile) SetAppend(bool) Errno {
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return EISDIR
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}
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// IsDir implements File.IsDir
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func (DirFile) IsDir() (bool, Errno) {
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return true, 0
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}
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// Read implements File.Read
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func (DirFile) Read([]byte) (int, Errno) {
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return 0, EISDIR
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}
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// Pread implements File.Pread
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func (DirFile) Pread([]byte, int64) (int, Errno) {
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return 0, EISDIR
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}
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// Write implements File.Write
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func (DirFile) Write([]byte) (int, Errno) {
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return 0, EISDIR
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}
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// Pwrite implements File.Pwrite
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func (DirFile) Pwrite([]byte, int64) (int, Errno) {
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return 0, EISDIR
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}
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// Truncate implements File.Truncate
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func (DirFile) Truncate(int64) Errno {
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return EISDIR
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}
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