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