mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-14 05:21:08 +00:00
1e7b32490d
This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).
107 lines
3.9 KiB
Go
107 lines
3.9 KiB
Go
package sys
|
|
|
|
import "io/fs"
|
|
|
|
// Inode is the file serial number, or zero if unknown.
|
|
//
|
|
// Any constant value will invalidate functions that use this for
|
|
// equivalence, such as os.SameFile (Stat_t.Ino).
|
|
//
|
|
// When zero is returned by a `readdir`, some compilers will attempt to
|
|
// get a non-zero value with `lstat`. Those using this for darwin's definition
|
|
// of `getdirentries` conflate zero `d_fileno` with a deleted file, so skip the
|
|
// entry. See /RATIONALE.md for more on this.
|
|
type Inode = uint64
|
|
|
|
// ^-- Inode is a type alias to consolidate documentation and aid in reference
|
|
// searches. While only Stat_t is exposed publicly at the moment, this is used
|
|
// internally for Dirent and several function return values.
|
|
|
|
// EpochNanos is a timestamp in epoch nanoseconds, or zero if unknown.
|
|
//
|
|
// This defines epoch time the same way as Walltime, except this value is
|
|
// packed into an int64. Common conversions are detailed in the examples.
|
|
type EpochNanos = int64
|
|
|
|
// Stat_t is similar to syscall.Stat_t, except available on all operating
|
|
// systems, including Windows.
|
|
//
|
|
// # Notes
|
|
//
|
|
// - This is used for WebAssembly ABI emulating the POSIX `stat` system call.
|
|
// Fields included are required for WebAssembly ABI including wasip1
|
|
// (a.k.a. wasix) and wasi-filesystem (a.k.a. wasip2). See
|
|
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/stat.html
|
|
// - Fields here are required for WebAssembly ABI including wasip1
|
|
// (a.k.a. wasix) and wasi-filesystem (a.k.a. wasip2).
|
|
// - This isn't the same as syscall.Stat_t because wazero supports Windows,
|
|
// which doesn't have that type. runtime.GOOS that has this already also
|
|
// have inconsistent field lengths, which complicates wasm binding.
|
|
// - Use NewStat_t to create this from an existing fs.FileInfo.
|
|
// - For portability, numeric fields are 64-bit when at least one platform
|
|
// defines it that large.
|
|
type Stat_t struct {
|
|
// Dev is the device ID of device containing the file.
|
|
Dev uint64
|
|
|
|
// Ino is the file serial number, or zero if not available. See Inode for
|
|
// more details including impact returning a zero value.
|
|
Ino Inode
|
|
|
|
// Mode is the same as Mode on fs.FileInfo containing bits to identify the
|
|
// type of the file (fs.ModeType) and its permissions (fs.ModePerm).
|
|
Mode fs.FileMode
|
|
|
|
// Nlink is the number of hard links to the file.
|
|
//
|
|
// Note: This value is platform-specific and often at least one. Linux will
|
|
// return 1+N for a directory, where BSD (like Darwin) return 2+N, which
|
|
// includes the dot entry.
|
|
Nlink uint64
|
|
|
|
// Size is the length in bytes for regular files. For symbolic links, this
|
|
// is length in bytes of the pathname contained in the symbolic link.
|
|
Size int64
|
|
|
|
// Atim is the last data access timestamp in epoch nanoseconds.
|
|
Atim EpochNanos
|
|
|
|
// Mtim is the last data modification timestamp in epoch nanoseconds.
|
|
Mtim EpochNanos
|
|
|
|
// Ctim is the last file status change timestamp in epoch nanoseconds.
|
|
Ctim EpochNanos
|
|
}
|
|
|
|
// NewStat_t fills a new Stat_t from `info`, including any runtime.GOOS-specific
|
|
// details from fs.FileInfo `Sys`. When `Sys` is already a *Stat_t, it is
|
|
// returned as-is.
|
|
//
|
|
// # Notes
|
|
//
|
|
// - When already in fs.FileInfo `Sys`, Stat_t must be a pointer.
|
|
// - When runtime.GOOS is "windows" Stat_t.Ino will be zero.
|
|
// - When fs.FileInfo `Sys` is nil or unknown, some fields not in fs.FileInfo
|
|
// are defaulted: Stat_t.Atim and Stat_t.Ctim are set to `ModTime`, and
|
|
// are set to ModTime and Stat_t.Nlink is set to 1.
|
|
func NewStat_t(info fs.FileInfo) Stat_t {
|
|
// Note: Pointer, not val, for parity with Go, which sets *syscall.Stat_t
|
|
if st, ok := info.Sys().(*Stat_t); ok {
|
|
return *st
|
|
}
|
|
return statFromFileInfo(info)
|
|
}
|
|
|
|
func defaultStatFromFileInfo(info fs.FileInfo) Stat_t {
|
|
st := Stat_t{}
|
|
st.Ino = 0
|
|
st.Dev = 0
|
|
st.Mode = info.Mode()
|
|
st.Nlink = 1
|
|
st.Size = info.Size()
|
|
mtim := info.ModTime().UnixNano() // Set all times to the mod time
|
|
st.Atim = mtim
|
|
st.Mtim = mtim
|
|
st.Ctim = mtim
|
|
return st
|
|
}
|