Struct wasi_common::table::Table
source · pub struct Table { /* private fields */ }Expand description
The Table type is designed to map u32 handles to resources. The table is now part of the
public interface to a WasiCtx - it is reference counted so that it can be shared beyond a
WasiCtx with other WASI proposals (e.g. wasi-crypto and wasi-nn) to manage their
resources. Elements in the Table are Any typed.
The Table type is intended to model how the Interface Types concept of Resources is shaping
up. Right now it is just an approximation.
Implementations§
source§impl Table
impl Table
sourcepub fn insert_at(&mut self, key: u32, a: Box<dyn Any + Send + Sync>)
pub fn insert_at(&mut self, key: u32, a: Box<dyn Any + Send + Sync>)
Insert a resource at a certain index.
Examples found in repository?
src/ctx.rs (line 43)
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pub fn insert_file(&mut self, fd: u32, file: Box<dyn WasiFile>, caps: FileCaps) {
self.table()
.insert_at(fd, Box::new(FileEntry::new(caps, file)));
}
pub fn push_file(&mut self, file: Box<dyn WasiFile>, caps: FileCaps) -> Result<u32, Error> {
self.table().push(Box::new(FileEntry::new(caps, file)))
}
pub fn insert_dir(
&mut self,
fd: u32,
dir: Box<dyn WasiDir>,
caps: DirCaps,
file_caps: FileCaps,
path: PathBuf,
) {
self.table().insert_at(
fd,
Box::new(DirEntry::new(caps, file_caps, Some(path), dir)),
);
}More examples
src/snapshots/preview_1.rs (line 466)
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async fn fd_renumber(&mut self, from: types::Fd, to: types::Fd) -> Result<(), Error> {
let table = self.table();
let from = u32::from(from);
let to = u32::from(to);
if !table.contains_key(from) {
return Err(Error::badf());
}
if table.is_preopen(from) || table.is_preopen(to) {
return Err(Error::not_supported().context("cannot renumber a preopen"));
}
let from_entry = table
.delete(from)
.expect("we checked that table contains from");
table.insert_at(to, from_entry);
Ok(())
}sourcepub fn push(&mut self, a: Box<dyn Any + Send + Sync>) -> Result<u32, Error>
pub fn push(&mut self, a: Box<dyn Any + Send + Sync>) -> Result<u32, Error>
Insert a resource at the next available index.
Examples found in repository?
src/ctx.rs (line 47)
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pub fn push_file(&mut self, file: Box<dyn WasiFile>, caps: FileCaps) -> Result<u32, Error> {
self.table().push(Box::new(FileEntry::new(caps, file)))
}
pub fn insert_dir(
&mut self,
fd: u32,
dir: Box<dyn WasiDir>,
caps: DirCaps,
file_caps: FileCaps,
path: PathBuf,
) {
self.table().insert_at(
fd,
Box::new(DirEntry::new(caps, file_caps, Some(path), dir)),
);
}
pub fn push_dir(
&mut self,
dir: Box<dyn WasiDir>,
caps: DirCaps,
file_caps: FileCaps,
path: PathBuf,
) -> Result<u32, Error> {
self.table()
.push(Box::new(DirEntry::new(caps, file_caps, Some(path), dir)))
}
pub fn table(&mut self) -> &mut Table {
&mut self.table
}
pub fn push_arg(&mut self, arg: &str) -> Result<(), StringArrayError> {
self.args.push(arg.to_owned())
}
pub fn push_env(&mut self, var: &str, value: &str) -> Result<(), StringArrayError> {
self.env.push(format!("{}={}", var, value))?;
Ok(())
}
pub fn set_stdin(&mut self, mut f: Box<dyn WasiFile>) {
let rights = Self::stdio_rights(&mut *f);
self.insert_file(0, f, rights);
}
pub fn set_stdout(&mut self, mut f: Box<dyn WasiFile>) {
let rights = Self::stdio_rights(&mut *f);
self.insert_file(1, f, rights);
}
pub fn set_stderr(&mut self, mut f: Box<dyn WasiFile>) {
let rights = Self::stdio_rights(&mut *f);
self.insert_file(2, f, rights);
}
fn stdio_rights(f: &mut dyn WasiFile) -> FileCaps {
let mut rights = FileCaps::all();
// If `f` is a tty, restrict the `tell` and `seek` capabilities, so
// that wasi-libc's `isatty` correctly detects the file descriptor
// as a tty.
if f.isatty() {
rights &= !(FileCaps::TELL | FileCaps::SEEK);
}
rights
}
pub fn push_preopened_dir(
&mut self,
dir: Box<dyn WasiDir>,
path: impl AsRef<Path>,
) -> Result<(), Error> {
let caps = DirCaps::all();
let file_caps = FileCaps::all();
self.table().push(Box::new(DirEntry::new(
caps,
file_caps,
Some(path.as_ref().to_owned()),
dir,
)))?;
Ok(())
}More examples
src/snapshots/preview_1.rs (lines 694-696)
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async fn path_open<'a>(
&mut self,
dirfd: types::Fd,
dirflags: types::Lookupflags,
path: &GuestPtr<'a, str>,
oflags: types::Oflags,
fs_rights_base: types::Rights,
fs_rights_inheriting: types::Rights,
fdflags: types::Fdflags,
) -> Result<types::Fd, Error> {
let table = self.table();
let dirfd = u32::from(dirfd);
if table.is::<FileEntry>(dirfd) {
return Err(Error::not_dir());
}
let dir_entry = table.get_dir(dirfd)?;
let symlink_follow = dirflags.contains(types::Lookupflags::SYMLINK_FOLLOW);
let oflags = OFlags::from(&oflags);
let fdflags = FdFlags::from(fdflags);
let path = path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)");
if oflags.contains(OFlags::DIRECTORY) {
if oflags.contains(OFlags::CREATE)
|| oflags.contains(OFlags::EXCLUSIVE)
|| oflags.contains(OFlags::TRUNCATE)
{
return Err(Error::invalid_argument().context("directory oflags"));
}
let dir_caps = dir_entry.child_dir_caps(DirCaps::from(&fs_rights_base));
let file_caps = dir_entry.child_file_caps(FileCaps::from(&fs_rights_inheriting));
let dir = dir_entry.get_cap(DirCaps::OPEN)?;
let child_dir = dir.open_dir(symlink_follow, path.deref()).await?;
drop(dir);
let fd = table.push(Box::new(DirEntry::new(
dir_caps, file_caps, None, child_dir,
)))?;
Ok(types::Fd::from(fd))
} else {
let mut required_caps = DirCaps::OPEN;
if oflags.contains(OFlags::CREATE) {
required_caps = required_caps | DirCaps::CREATE_FILE;
}
let file_caps = dir_entry.child_file_caps(FileCaps::from(&fs_rights_base));
let dir = dir_entry.get_cap(required_caps)?;
let read = file_caps.contains(FileCaps::READ);
let write = file_caps.contains(FileCaps::WRITE)
|| file_caps.contains(FileCaps::ALLOCATE)
|| file_caps.contains(FileCaps::FILESTAT_SET_SIZE);
let file = dir
.open_file(symlink_follow, path.deref(), oflags, read, write, fdflags)
.await?;
drop(dir);
let fd = table.push(Box::new(FileEntry::new(file_caps, file)))?;
Ok(types::Fd::from(fd))
}
}
async fn path_readlink<'a>(
&mut self,
dirfd: types::Fd,
path: &GuestPtr<'a, str>,
buf: &GuestPtr<'a, u8>,
buf_len: types::Size,
) -> Result<types::Size, Error> {
let link = self
.table()
.get_dir(u32::from(dirfd))?
.get_cap(DirCaps::READLINK)?
.read_link(path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)").deref())
.await?
.into_os_string()
.into_string()
.map_err(|_| Error::illegal_byte_sequence().context("link contents"))?;
let link_bytes = link.as_bytes();
let link_len = link_bytes.len();
if link_len > buf_len as usize {
return Err(Error::range());
}
let mut buf = buf
.as_array(link_len as u32)
.as_slice_mut()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)");
buf.copy_from_slice(link_bytes);
Ok(link_len as types::Size)
}
async fn path_remove_directory<'a>(
&mut self,
dirfd: types::Fd,
path: &GuestPtr<'a, str>,
) -> Result<(), Error> {
self.table()
.get_dir(u32::from(dirfd))?
.get_cap(DirCaps::REMOVE_DIRECTORY)?
.remove_dir(path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)").deref())
.await
}
async fn path_rename<'a>(
&mut self,
src_fd: types::Fd,
src_path: &GuestPtr<'a, str>,
dest_fd: types::Fd,
dest_path: &GuestPtr<'a, str>,
) -> Result<(), Error> {
let table = self.table();
let src_dir = table
.get_dir(u32::from(src_fd))?
.get_cap(DirCaps::RENAME_SOURCE)?;
let dest_dir = table
.get_dir(u32::from(dest_fd))?
.get_cap(DirCaps::RENAME_TARGET)?;
src_dir
.rename(
src_path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)").deref(),
dest_dir.deref(),
dest_path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)").deref(),
)
.await
}
async fn path_symlink<'a>(
&mut self,
src_path: &GuestPtr<'a, str>,
dirfd: types::Fd,
dest_path: &GuestPtr<'a, str>,
) -> Result<(), Error> {
self.table()
.get_dir(u32::from(dirfd))?
.get_cap(DirCaps::SYMLINK)?
.symlink(src_path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)").deref(), dest_path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)").deref())
.await
}
async fn path_unlink_file<'a>(
&mut self,
dirfd: types::Fd,
path: &GuestPtr<'a, str>,
) -> Result<(), Error> {
self.table()
.get_dir(u32::from(dirfd))?
.get_cap(DirCaps::UNLINK_FILE)?
.unlink_file(path.as_str()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)").deref())
.await
}
async fn poll_oneoff<'a>(
&mut self,
subs: &GuestPtr<'a, types::Subscription>,
events: &GuestPtr<'a, types::Event>,
nsubscriptions: types::Size,
) -> Result<types::Size, Error> {
if nsubscriptions == 0 {
return Err(Error::invalid_argument().context("nsubscriptions must be nonzero"));
}
// Special-case a `poll_oneoff` which is just sleeping on a single
// relative timer event, such as what WASI libc uses to implement sleep
// functions. This supports all clock IDs, because POSIX says that
// `clock_settime` doesn't effect relative sleeps.
if nsubscriptions == 1 {
let sub = subs.read()?;
if let types::SubscriptionU::Clock(clocksub) = sub.u {
if !clocksub
.flags
.contains(types::Subclockflags::SUBSCRIPTION_CLOCK_ABSTIME)
{
self.sched
.sleep(Duration::from_nanos(clocksub.timeout))
.await?;
events.write(types::Event {
userdata: sub.userdata,
error: types::Errno::Success,
type_: types::Eventtype::Clock,
fd_readwrite: fd_readwrite_empty(),
})?;
return Ok(1);
}
}
}
let table = &mut self.table;
// We need these refmuts to outlive Poll, which will hold the &mut dyn WasiFile inside
let mut read_refs: Vec<(&dyn WasiFile, Userdata)> = Vec::new();
let mut write_refs: Vec<(&dyn WasiFile, Userdata)> = Vec::new();
let mut poll = Poll::new();
let subs = subs.as_array(nsubscriptions);
for sub_elem in subs.iter() {
let sub_ptr = sub_elem?;
let sub = sub_ptr.read()?;
match sub.u {
types::SubscriptionU::Clock(clocksub) => match clocksub.id {
types::Clockid::Monotonic => {
let clock = self.clocks.monotonic.deref();
let precision = Duration::from_nanos(clocksub.precision);
let duration = Duration::from_nanos(clocksub.timeout);
let deadline = if clocksub
.flags
.contains(types::Subclockflags::SUBSCRIPTION_CLOCK_ABSTIME)
{
self.clocks
.creation_time
.checked_add(duration)
.ok_or_else(|| Error::overflow().context("deadline"))?
} else {
clock
.now(precision)
.checked_add(duration)
.ok_or_else(|| Error::overflow().context("deadline"))?
};
poll.subscribe_monotonic_clock(
clock,
deadline,
precision,
sub.userdata.into(),
)
}
types::Clockid::Realtime => {
// POSIX specifies that functions like `nanosleep` and others use the
// `REALTIME` clock. But it also says that `clock_settime` has no effect
// on threads waiting in these functions. MONOTONIC should always have
// resolution at least as good as REALTIME, so we can translate a
// non-absolute `REALTIME` request into a `MONOTONIC` request.
let clock = self.clocks.monotonic.deref();
let precision = Duration::from_nanos(clocksub.precision);
let duration = Duration::from_nanos(clocksub.timeout);
let deadline = if clocksub
.flags
.contains(types::Subclockflags::SUBSCRIPTION_CLOCK_ABSTIME)
{
return Err(Error::not_supported());
} else {
clock
.now(precision)
.checked_add(duration)
.ok_or_else(|| Error::overflow().context("deadline"))?
};
poll.subscribe_monotonic_clock(
clock,
deadline,
precision,
sub.userdata.into(),
)
}
_ => Err(Error::invalid_argument()
.context("timer subscriptions only support monotonic timer"))?,
},
types::SubscriptionU::FdRead(readsub) => {
let fd = readsub.file_descriptor;
let file_ref = table
.get_file(u32::from(fd))?
.get_cap(FileCaps::POLL_READWRITE)?;
read_refs.push((file_ref, sub.userdata.into()));
}
types::SubscriptionU::FdWrite(writesub) => {
let fd = writesub.file_descriptor;
let file_ref = table
.get_file(u32::from(fd))?
.get_cap(FileCaps::POLL_READWRITE)?;
write_refs.push((file_ref, sub.userdata.into()));
}
}
}
for (f, ud) in read_refs.iter_mut() {
poll.subscribe_read(*f, *ud);
}
for (f, ud) in write_refs.iter_mut() {
poll.subscribe_write(*f, *ud);
}
self.sched.poll_oneoff(&mut poll).await?;
let results = poll.results();
let num_results = results.len();
assert!(
num_results <= nsubscriptions as usize,
"results exceeds subscriptions"
);
let events = events.as_array(
num_results
.try_into()
.expect("not greater than nsubscriptions"),
);
for ((result, userdata), event_elem) in results.into_iter().zip(events.iter()) {
let event_ptr = event_elem?;
let userdata: types::Userdata = userdata.into();
event_ptr.write(match result {
SubscriptionResult::Read(r) => {
let type_ = types::Eventtype::FdRead;
match r {
Ok((nbytes, flags)) => types::Event {
userdata,
error: types::Errno::Success,
type_,
fd_readwrite: types::EventFdReadwrite {
nbytes,
flags: types::Eventrwflags::from(&flags),
},
},
Err(e) => types::Event {
userdata,
error: e.downcast().map_err(Error::trap)?,
type_,
fd_readwrite: fd_readwrite_empty(),
},
}
}
SubscriptionResult::Write(r) => {
let type_ = types::Eventtype::FdWrite;
match r {
Ok((nbytes, flags)) => types::Event {
userdata,
error: types::Errno::Success,
type_,
fd_readwrite: types::EventFdReadwrite {
nbytes,
flags: types::Eventrwflags::from(&flags),
},
},
Err(e) => types::Event {
userdata,
error: e.downcast().map_err(Error::trap)?,
type_,
fd_readwrite: fd_readwrite_empty(),
},
}
}
SubscriptionResult::MonotonicClock(r) => {
let type_ = types::Eventtype::Clock;
types::Event {
userdata,
error: match r {
Ok(()) => types::Errno::Success,
Err(e) => e.downcast().map_err(Error::trap)?,
},
type_,
fd_readwrite: fd_readwrite_empty(),
}
}
})?;
}
Ok(num_results.try_into().expect("results fit into memory"))
}
async fn proc_exit(&mut self, status: types::Exitcode) -> anyhow::Error {
// Check that the status is within WASI's range.
if status < 126 {
I32Exit(status as i32).into()
} else {
anyhow::Error::msg("exit with invalid exit status outside of [0..126)")
}
}
async fn proc_raise(&mut self, _sig: types::Signal) -> Result<(), Error> {
Err(Error::trap(anyhow::Error::msg("proc_raise unsupported")))
}
async fn sched_yield(&mut self) -> Result<(), Error> {
self.sched.sched_yield().await
}
async fn random_get<'a>(
&mut self,
buf: &GuestPtr<'a, u8>,
buf_len: types::Size,
) -> Result<(), Error> {
let mut buf = buf
.as_array(buf_len)
.as_slice_mut()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)");
self.random.try_fill_bytes(buf.deref_mut())?;
Ok(())
}
async fn sock_accept(
&mut self,
fd: types::Fd,
flags: types::Fdflags,
) -> Result<types::Fd, Error> {
let table = self.table();
let f = table
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::READ)?;
let file = f.sock_accept(FdFlags::from(flags)).await?;
let file_caps = FileCaps::READ
| FileCaps::WRITE
| FileCaps::FDSTAT_SET_FLAGS
| FileCaps::POLL_READWRITE
| FileCaps::FILESTAT_GET;
let fd = table.push(Box::new(FileEntry::new(file_caps, file)))?;
Ok(types::Fd::from(fd))
}sourcepub fn contains_key(&self, key: u32) -> bool
pub fn contains_key(&self, key: u32) -> bool
Check if the table has a resource at the given index.
Examples found in repository?
src/snapshots/preview_1.rs (line 136)
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async fn fd_close(&mut self, fd: types::Fd) -> Result<(), Error> {
let table = self.table();
let fd = u32::from(fd);
// Fail fast: If not present in table, Badf
if !table.contains_key(fd) {
return Err(Error::badf().context("key not in table"));
}
// fd_close must close either a File or a Dir handle
if table.is::<FileEntry>(fd) {
let _ = table.delete(fd);
} else if table.is::<DirEntry>(fd) {
// We cannot close preopened directories
let dir_entry: &DirEntry = table.get(fd).unwrap();
if dir_entry.preopen_path().is_some() {
return Err(Error::not_supported().context("cannot close propened directory"));
}
drop(dir_entry);
let _ = table.delete(fd);
} else {
return Err(Error::badf().context("key does not refer to file or directory"));
}
Ok(())
}
async fn fd_datasync(&mut self, fd: types::Fd) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::DATASYNC)?
.datasync()
.await?;
Ok(())
}
async fn fd_fdstat_get(&mut self, fd: types::Fd) -> Result<types::Fdstat, Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let file_entry: &mut FileEntry = table.get_mut(fd)?;
let fdstat = file_entry.get_fdstat().await?;
Ok(types::Fdstat::from(&fdstat))
} else if table.is::<DirEntry>(fd) {
let dir_entry: &DirEntry = table.get(fd)?;
let dir_fdstat = dir_entry.get_dir_fdstat();
Ok(types::Fdstat::from(&dir_fdstat))
} else {
Err(Error::badf())
}
}
async fn fd_fdstat_set_flags(
&mut self,
fd: types::Fd,
flags: types::Fdflags,
) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::FDSTAT_SET_FLAGS)?
.set_fdflags(FdFlags::from(flags))
.await
}
async fn fd_fdstat_set_rights(
&mut self,
fd: types::Fd,
fs_rights_base: types::Rights,
fs_rights_inheriting: types::Rights,
) -> Result<(), Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let file_entry: &mut FileEntry = table.get_mut(fd)?;
let file_caps = FileCaps::from(&fs_rights_base);
file_entry.drop_caps_to(file_caps)
} else if table.is::<DirEntry>(fd) {
let dir_entry: &mut DirEntry = table.get_mut(fd)?;
let dir_caps = DirCaps::from(&fs_rights_base);
let file_caps = FileCaps::from(&fs_rights_inheriting);
dir_entry.drop_caps_to(dir_caps, file_caps)
} else {
Err(Error::badf())
}
}
async fn fd_filestat_get(&mut self, fd: types::Fd) -> Result<types::Filestat, Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let filestat = table
.get_file_mut(fd)?
.get_cap_mut(FileCaps::FILESTAT_GET)?
.get_filestat()
.await?;
Ok(filestat.into())
} else if table.is::<DirEntry>(fd) {
let filestat = table
.get_dir(fd)?
.get_cap(DirCaps::FILESTAT_GET)?
.get_filestat()
.await?;
Ok(filestat.into())
} else {
Err(Error::badf())
}
}
async fn fd_filestat_set_size(
&mut self,
fd: types::Fd,
size: types::Filesize,
) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::FILESTAT_SET_SIZE)?
.set_filestat_size(size)
.await?;
Ok(())
}
async fn fd_filestat_set_times(
&mut self,
fd: types::Fd,
atim: types::Timestamp,
mtim: types::Timestamp,
fst_flags: types::Fstflags,
) -> Result<(), Error> {
let fd = u32::from(fd);
let table = self.table();
// Validate flags
let set_atim = fst_flags.contains(types::Fstflags::ATIM);
let set_atim_now = fst_flags.contains(types::Fstflags::ATIM_NOW);
let set_mtim = fst_flags.contains(types::Fstflags::MTIM);
let set_mtim_now = fst_flags.contains(types::Fstflags::MTIM_NOW);
let atim = systimespec(set_atim, atim, set_atim_now).map_err(|e| e.context("atim"))?;
let mtim = systimespec(set_mtim, mtim, set_mtim_now).map_err(|e| e.context("mtim"))?;
if table.is::<FileEntry>(fd) {
table
.get_file_mut(fd)
.expect("checked that entry is file")
.get_cap_mut(FileCaps::FILESTAT_SET_TIMES)?
.set_times(atim, mtim)
.await
} else if table.is::<DirEntry>(fd) {
table
.get_dir(fd)
.expect("checked that entry is dir")
.get_cap(DirCaps::FILESTAT_SET_TIMES)?
.set_times(".", atim, mtim, false)
.await
} else {
Err(Error::badf())
}
}
async fn fd_read<'a>(
&mut self,
fd: types::Fd,
iovs: &types::IovecArray<'a>,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::READ)?;
let mut guest_slices: Vec<wiggle::GuestSliceMut<u8>> =
iovs.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Iovec = iov_ptr.read()?;
Ok(iov.buf.as_array(iov.buf_len).as_slice_mut()?.expect(
"cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)",
))
})
.collect::<Result<_, Error>>()?;
let mut ioslices: Vec<IoSliceMut> = guest_slices
.iter_mut()
.map(|s| IoSliceMut::new(&mut *s))
.collect();
let bytes_read = f.read_vectored(&mut ioslices).await?;
Ok(types::Size::try_from(bytes_read)?)
}
async fn fd_pread<'a>(
&mut self,
fd: types::Fd,
iovs: &types::IovecArray<'a>,
offset: types::Filesize,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::READ | FileCaps::SEEK)?;
let mut guest_slices: Vec<wiggle::GuestSliceMut<u8>> =
iovs.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Iovec = iov_ptr.read()?;
Ok(iov.buf.as_array(iov.buf_len).as_slice_mut()?.expect(
"cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)",
))
})
.collect::<Result<_, Error>>()?;
let mut ioslices: Vec<IoSliceMut> = guest_slices
.iter_mut()
.map(|s| IoSliceMut::new(&mut *s))
.collect();
let bytes_read = f.read_vectored_at(&mut ioslices, offset).await?;
Ok(types::Size::try_from(bytes_read)?)
}
async fn fd_write<'a>(
&mut self,
fd: types::Fd,
ciovs: &types::CiovecArray<'a>,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::WRITE)?;
let guest_slices: Vec<wiggle::GuestSlice<u8>> = ciovs
.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Ciovec = iov_ptr.read()?;
Ok(iov
.buf
.as_array(iov.buf_len)
.as_slice()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)"))
})
.collect::<Result<_, Error>>()?;
let ioslices: Vec<IoSlice> = guest_slices
.iter()
.map(|s| IoSlice::new(s.deref()))
.collect();
let bytes_written = f.write_vectored(&ioslices).await?;
Ok(types::Size::try_from(bytes_written)?)
}
async fn fd_pwrite<'a>(
&mut self,
fd: types::Fd,
ciovs: &types::CiovecArray<'a>,
offset: types::Filesize,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::WRITE | FileCaps::SEEK)?;
let guest_slices: Vec<wiggle::GuestSlice<u8>> = ciovs
.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Ciovec = iov_ptr.read()?;
Ok(iov
.buf
.as_array(iov.buf_len)
.as_slice()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)"))
})
.collect::<Result<_, Error>>()?;
let ioslices: Vec<IoSlice> = guest_slices
.iter()
.map(|s| IoSlice::new(s.deref()))
.collect();
let bytes_written = f.write_vectored_at(&ioslices, offset).await?;
Ok(types::Size::try_from(bytes_written)?)
}
async fn fd_prestat_get(&mut self, fd: types::Fd) -> Result<types::Prestat, Error> {
let table = self.table();
let dir_entry: &DirEntry = table.get(u32::from(fd)).map_err(|_| Error::badf())?;
if let Some(ref preopen) = dir_entry.preopen_path() {
let path_str = preopen.to_str().ok_or_else(|| Error::not_supported())?;
let pr_name_len = u32::try_from(path_str.as_bytes().len())?;
Ok(types::Prestat::Dir(types::PrestatDir { pr_name_len }))
} else {
Err(Error::not_supported().context("file is not a preopen"))
}
}
async fn fd_prestat_dir_name<'a>(
&mut self,
fd: types::Fd,
path: &GuestPtr<'a, u8>,
path_max_len: types::Size,
) -> Result<(), Error> {
let table = self.table();
let dir_entry: &DirEntry = table.get(u32::from(fd)).map_err(|_| Error::not_dir())?;
if let Some(ref preopen) = dir_entry.preopen_path() {
let path_bytes = preopen
.to_str()
.ok_or_else(|| Error::not_supported())?
.as_bytes();
let path_len = path_bytes.len();
if path_len < path_max_len as usize {
return Err(Error::name_too_long());
}
let mut p_memory = path
.as_array(path_len as u32)
.as_slice_mut()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)");
p_memory.copy_from_slice(path_bytes);
Ok(())
} else {
Err(Error::not_supported())
}
}
async fn fd_renumber(&mut self, from: types::Fd, to: types::Fd) -> Result<(), Error> {
let table = self.table();
let from = u32::from(from);
let to = u32::from(to);
if !table.contains_key(from) {
return Err(Error::badf());
}
if table.is_preopen(from) || table.is_preopen(to) {
return Err(Error::not_supported().context("cannot renumber a preopen"));
}
let from_entry = table
.delete(from)
.expect("we checked that table contains from");
table.insert_at(to, from_entry);
Ok(())
}sourcepub fn is<T: Any + Sized>(&self, key: u32) -> bool
pub fn is<T: Any + Sized>(&self, key: u32) -> bool
Check if the resource at a given index can be downcast to a given type. Note: this will always fail if the resource is already borrowed.
Examples found in repository?
More examples
src/snapshots/preview_1.rs (line 140)
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async fn fd_close(&mut self, fd: types::Fd) -> Result<(), Error> {
let table = self.table();
let fd = u32::from(fd);
// Fail fast: If not present in table, Badf
if !table.contains_key(fd) {
return Err(Error::badf().context("key not in table"));
}
// fd_close must close either a File or a Dir handle
if table.is::<FileEntry>(fd) {
let _ = table.delete(fd);
} else if table.is::<DirEntry>(fd) {
// We cannot close preopened directories
let dir_entry: &DirEntry = table.get(fd).unwrap();
if dir_entry.preopen_path().is_some() {
return Err(Error::not_supported().context("cannot close propened directory"));
}
drop(dir_entry);
let _ = table.delete(fd);
} else {
return Err(Error::badf().context("key does not refer to file or directory"));
}
Ok(())
}
async fn fd_datasync(&mut self, fd: types::Fd) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::DATASYNC)?
.datasync()
.await?;
Ok(())
}
async fn fd_fdstat_get(&mut self, fd: types::Fd) -> Result<types::Fdstat, Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let file_entry: &mut FileEntry = table.get_mut(fd)?;
let fdstat = file_entry.get_fdstat().await?;
Ok(types::Fdstat::from(&fdstat))
} else if table.is::<DirEntry>(fd) {
let dir_entry: &DirEntry = table.get(fd)?;
let dir_fdstat = dir_entry.get_dir_fdstat();
Ok(types::Fdstat::from(&dir_fdstat))
} else {
Err(Error::badf())
}
}
async fn fd_fdstat_set_flags(
&mut self,
fd: types::Fd,
flags: types::Fdflags,
) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::FDSTAT_SET_FLAGS)?
.set_fdflags(FdFlags::from(flags))
.await
}
async fn fd_fdstat_set_rights(
&mut self,
fd: types::Fd,
fs_rights_base: types::Rights,
fs_rights_inheriting: types::Rights,
) -> Result<(), Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let file_entry: &mut FileEntry = table.get_mut(fd)?;
let file_caps = FileCaps::from(&fs_rights_base);
file_entry.drop_caps_to(file_caps)
} else if table.is::<DirEntry>(fd) {
let dir_entry: &mut DirEntry = table.get_mut(fd)?;
let dir_caps = DirCaps::from(&fs_rights_base);
let file_caps = FileCaps::from(&fs_rights_inheriting);
dir_entry.drop_caps_to(dir_caps, file_caps)
} else {
Err(Error::badf())
}
}
async fn fd_filestat_get(&mut self, fd: types::Fd) -> Result<types::Filestat, Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let filestat = table
.get_file_mut(fd)?
.get_cap_mut(FileCaps::FILESTAT_GET)?
.get_filestat()
.await?;
Ok(filestat.into())
} else if table.is::<DirEntry>(fd) {
let filestat = table
.get_dir(fd)?
.get_cap(DirCaps::FILESTAT_GET)?
.get_filestat()
.await?;
Ok(filestat.into())
} else {
Err(Error::badf())
}
}
async fn fd_filestat_set_size(
&mut self,
fd: types::Fd,
size: types::Filesize,
) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::FILESTAT_SET_SIZE)?
.set_filestat_size(size)
.await?;
Ok(())
}
async fn fd_filestat_set_times(
&mut self,
fd: types::Fd,
atim: types::Timestamp,
mtim: types::Timestamp,
fst_flags: types::Fstflags,
) -> Result<(), Error> {
let fd = u32::from(fd);
let table = self.table();
// Validate flags
let set_atim = fst_flags.contains(types::Fstflags::ATIM);
let set_atim_now = fst_flags.contains(types::Fstflags::ATIM_NOW);
let set_mtim = fst_flags.contains(types::Fstflags::MTIM);
let set_mtim_now = fst_flags.contains(types::Fstflags::MTIM_NOW);
let atim = systimespec(set_atim, atim, set_atim_now).map_err(|e| e.context("atim"))?;
let mtim = systimespec(set_mtim, mtim, set_mtim_now).map_err(|e| e.context("mtim"))?;
if table.is::<FileEntry>(fd) {
table
.get_file_mut(fd)
.expect("checked that entry is file")
.get_cap_mut(FileCaps::FILESTAT_SET_TIMES)?
.set_times(atim, mtim)
.await
} else if table.is::<DirEntry>(fd) {
table
.get_dir(fd)
.expect("checked that entry is dir")
.get_cap(DirCaps::FILESTAT_SET_TIMES)?
.set_times(".", atim, mtim, false)
.await
} else {
Err(Error::badf())
}
}
async fn fd_read<'a>(
&mut self,
fd: types::Fd,
iovs: &types::IovecArray<'a>,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::READ)?;
let mut guest_slices: Vec<wiggle::GuestSliceMut<u8>> =
iovs.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Iovec = iov_ptr.read()?;
Ok(iov.buf.as_array(iov.buf_len).as_slice_mut()?.expect(
"cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)",
))
})
.collect::<Result<_, Error>>()?;
let mut ioslices: Vec<IoSliceMut> = guest_slices
.iter_mut()
.map(|s| IoSliceMut::new(&mut *s))
.collect();
let bytes_read = f.read_vectored(&mut ioslices).await?;
Ok(types::Size::try_from(bytes_read)?)
}
async fn fd_pread<'a>(
&mut self,
fd: types::Fd,
iovs: &types::IovecArray<'a>,
offset: types::Filesize,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::READ | FileCaps::SEEK)?;
let mut guest_slices: Vec<wiggle::GuestSliceMut<u8>> =
iovs.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Iovec = iov_ptr.read()?;
Ok(iov.buf.as_array(iov.buf_len).as_slice_mut()?.expect(
"cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)",
))
})
.collect::<Result<_, Error>>()?;
let mut ioslices: Vec<IoSliceMut> = guest_slices
.iter_mut()
.map(|s| IoSliceMut::new(&mut *s))
.collect();
let bytes_read = f.read_vectored_at(&mut ioslices, offset).await?;
Ok(types::Size::try_from(bytes_read)?)
}
async fn fd_write<'a>(
&mut self,
fd: types::Fd,
ciovs: &types::CiovecArray<'a>,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::WRITE)?;
let guest_slices: Vec<wiggle::GuestSlice<u8>> = ciovs
.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Ciovec = iov_ptr.read()?;
Ok(iov
.buf
.as_array(iov.buf_len)
.as_slice()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)"))
})
.collect::<Result<_, Error>>()?;
let ioslices: Vec<IoSlice> = guest_slices
.iter()
.map(|s| IoSlice::new(s.deref()))
.collect();
let bytes_written = f.write_vectored(&ioslices).await?;
Ok(types::Size::try_from(bytes_written)?)
}
async fn fd_pwrite<'a>(
&mut self,
fd: types::Fd,
ciovs: &types::CiovecArray<'a>,
offset: types::Filesize,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::WRITE | FileCaps::SEEK)?;
let guest_slices: Vec<wiggle::GuestSlice<u8>> = ciovs
.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Ciovec = iov_ptr.read()?;
Ok(iov
.buf
.as_array(iov.buf_len)
.as_slice()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)"))
})
.collect::<Result<_, Error>>()?;
let ioslices: Vec<IoSlice> = guest_slices
.iter()
.map(|s| IoSlice::new(s.deref()))
.collect();
let bytes_written = f.write_vectored_at(&ioslices, offset).await?;
Ok(types::Size::try_from(bytes_written)?)
}
async fn fd_prestat_get(&mut self, fd: types::Fd) -> Result<types::Prestat, Error> {
let table = self.table();
let dir_entry: &DirEntry = table.get(u32::from(fd)).map_err(|_| Error::badf())?;
if let Some(ref preopen) = dir_entry.preopen_path() {
let path_str = preopen.to_str().ok_or_else(|| Error::not_supported())?;
let pr_name_len = u32::try_from(path_str.as_bytes().len())?;
Ok(types::Prestat::Dir(types::PrestatDir { pr_name_len }))
} else {
Err(Error::not_supported().context("file is not a preopen"))
}
}
async fn fd_prestat_dir_name<'a>(
&mut self,
fd: types::Fd,
path: &GuestPtr<'a, u8>,
path_max_len: types::Size,
) -> Result<(), Error> {
let table = self.table();
let dir_entry: &DirEntry = table.get(u32::from(fd)).map_err(|_| Error::not_dir())?;
if let Some(ref preopen) = dir_entry.preopen_path() {
let path_bytes = preopen
.to_str()
.ok_or_else(|| Error::not_supported())?
.as_bytes();
let path_len = path_bytes.len();
if path_len < path_max_len as usize {
return Err(Error::name_too_long());
}
let mut p_memory = path
.as_array(path_len as u32)
.as_slice_mut()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)");
p_memory.copy_from_slice(path_bytes);
Ok(())
} else {
Err(Error::not_supported())
}
}
async fn fd_renumber(&mut self, from: types::Fd, to: types::Fd) -> Result<(), Error> {
let table = self.table();
let from = u32::from(from);
let to = u32::from(to);
if !table.contains_key(from) {
return Err(Error::badf());
}
if table.is_preopen(from) || table.is_preopen(to) {
return Err(Error::not_supported().context("cannot renumber a preopen"));
}
let from_entry = table
.delete(from)
.expect("we checked that table contains from");
table.insert_at(to, from_entry);
Ok(())
}
async fn fd_seek(
&mut self,
fd: types::Fd,
offset: types::Filedelta,
whence: types::Whence,
) -> Result<types::Filesize, Error> {
use std::io::SeekFrom;
let required_caps = if offset == 0 && whence == types::Whence::Cur {
FileCaps::TELL
} else {
FileCaps::TELL | FileCaps::SEEK
};
let whence = match whence {
types::Whence::Cur => SeekFrom::Current(offset),
types::Whence::End => SeekFrom::End(offset),
types::Whence::Set => SeekFrom::Start(offset as u64),
};
let newoffset = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(required_caps)?
.seek(whence)
.await?;
Ok(newoffset)
}
async fn fd_sync(&mut self, fd: types::Fd) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::SYNC)?
.sync()
.await?;
Ok(())
}
async fn fd_tell(&mut self, fd: types::Fd) -> Result<types::Filesize, Error> {
// XXX should this be stream_position?
let offset = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::TELL)?
.seek(std::io::SeekFrom::Current(0))
.await?;
Ok(offset)
}
async fn fd_readdir<'a>(
&mut self,
fd: types::Fd,
buf: &GuestPtr<'a, u8>,
buf_len: types::Size,
cookie: types::Dircookie,
) -> Result<types::Size, Error> {
let mut bufused = 0;
let mut buf = buf.clone();
for entity in self
.table()
.get_dir(u32::from(fd))?
.get_cap(DirCaps::READDIR)?
.readdir(ReaddirCursor::from(cookie))
.await?
{
let entity = entity?;
let dirent_raw = dirent_bytes(types::Dirent::try_from(&entity)?);
let dirent_len: types::Size = dirent_raw.len().try_into()?;
let name_raw = entity.name.as_bytes();
let name_len: types::Size = name_raw.len().try_into()?;
// Copy as many bytes of the dirent as we can, up to the end of the buffer
let dirent_copy_len = std::cmp::min(dirent_len, buf_len - bufused);
buf.as_array(dirent_copy_len)
.copy_from_slice(&dirent_raw[..dirent_copy_len as usize])?;
// If the dirent struct wasnt compied entirely, return that we filled the buffer, which
// tells libc that we're not at EOF.
if dirent_copy_len < dirent_len {
return Ok(buf_len);
}
buf = buf.add(dirent_copy_len)?;
bufused += dirent_copy_len;
// Copy as many bytes of the name as we can, up to the end of the buffer
let name_copy_len = std::cmp::min(name_len, buf_len - bufused);
buf.as_array(name_copy_len)
.copy_from_slice(&name_raw[..name_copy_len as usize])?;
// If the dirent struct wasn't copied entirely, return that we filled the buffer, which
// tells libc that we're not at EOF
if name_copy_len < name_len {
return Ok(buf_len);
}
buf = buf.add(name_copy_len)?;
bufused += name_copy_len;
}
Ok(bufused)
}
async fn path_create_directory<'a>(
&mut self,
dirfd: types::Fd,
path: &GuestPtr<'a, str>,
) -> Result<(), Error> {
self.table()
.get_dir(u32::from(dirfd))?
.get_cap(DirCaps::CREATE_DIRECTORY)?
.create_dir(path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)").deref())
.await
}
async fn path_filestat_get<'a>(
&mut self,
dirfd: types::Fd,
flags: types::Lookupflags,
path: &GuestPtr<'a, str>,
) -> Result<types::Filestat, Error> {
let filestat = self
.table()
.get_dir(u32::from(dirfd))?
.get_cap(DirCaps::PATH_FILESTAT_GET)?
.get_path_filestat(
path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)").deref(),
flags.contains(types::Lookupflags::SYMLINK_FOLLOW),
)
.await?;
Ok(types::Filestat::from(filestat))
}
async fn path_filestat_set_times<'a>(
&mut self,
dirfd: types::Fd,
flags: types::Lookupflags,
path: &GuestPtr<'a, str>,
atim: types::Timestamp,
mtim: types::Timestamp,
fst_flags: types::Fstflags,
) -> Result<(), Error> {
let set_atim = fst_flags.contains(types::Fstflags::ATIM);
let set_atim_now = fst_flags.contains(types::Fstflags::ATIM_NOW);
let set_mtim = fst_flags.contains(types::Fstflags::MTIM);
let set_mtim_now = fst_flags.contains(types::Fstflags::MTIM_NOW);
let atim = systimespec(set_atim, atim, set_atim_now).map_err(|e| e.context("atim"))?;
let mtim = systimespec(set_mtim, mtim, set_mtim_now).map_err(|e| e.context("mtim"))?;
self.table()
.get_dir(u32::from(dirfd))?
.get_cap(DirCaps::PATH_FILESTAT_SET_TIMES)?
.set_times(
path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)").deref(),
atim,
mtim,
flags.contains(types::Lookupflags::SYMLINK_FOLLOW),
)
.await
}
async fn path_link<'a>(
&mut self,
src_fd: types::Fd,
src_flags: types::Lookupflags,
src_path: &GuestPtr<'a, str>,
target_fd: types::Fd,
target_path: &GuestPtr<'a, str>,
) -> Result<(), Error> {
let table = self.table();
let src_dir = table
.get_dir(u32::from(src_fd))?
.get_cap(DirCaps::LINK_SOURCE)?;
let target_dir = table
.get_dir(u32::from(target_fd))?
.get_cap(DirCaps::LINK_TARGET)?;
let symlink_follow = src_flags.contains(types::Lookupflags::SYMLINK_FOLLOW);
if symlink_follow {
return Err(Error::invalid_argument()
.context("symlink following on path_link is not supported"));
}
src_dir
.hard_link(
src_path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)").deref(),
target_dir.deref(),
target_path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)").deref(),
)
.await
}
async fn path_open<'a>(
&mut self,
dirfd: types::Fd,
dirflags: types::Lookupflags,
path: &GuestPtr<'a, str>,
oflags: types::Oflags,
fs_rights_base: types::Rights,
fs_rights_inheriting: types::Rights,
fdflags: types::Fdflags,
) -> Result<types::Fd, Error> {
let table = self.table();
let dirfd = u32::from(dirfd);
if table.is::<FileEntry>(dirfd) {
return Err(Error::not_dir());
}
let dir_entry = table.get_dir(dirfd)?;
let symlink_follow = dirflags.contains(types::Lookupflags::SYMLINK_FOLLOW);
let oflags = OFlags::from(&oflags);
let fdflags = FdFlags::from(fdflags);
let path = path.as_str()?.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)");
if oflags.contains(OFlags::DIRECTORY) {
if oflags.contains(OFlags::CREATE)
|| oflags.contains(OFlags::EXCLUSIVE)
|| oflags.contains(OFlags::TRUNCATE)
{
return Err(Error::invalid_argument().context("directory oflags"));
}
let dir_caps = dir_entry.child_dir_caps(DirCaps::from(&fs_rights_base));
let file_caps = dir_entry.child_file_caps(FileCaps::from(&fs_rights_inheriting));
let dir = dir_entry.get_cap(DirCaps::OPEN)?;
let child_dir = dir.open_dir(symlink_follow, path.deref()).await?;
drop(dir);
let fd = table.push(Box::new(DirEntry::new(
dir_caps, file_caps, None, child_dir,
)))?;
Ok(types::Fd::from(fd))
} else {
let mut required_caps = DirCaps::OPEN;
if oflags.contains(OFlags::CREATE) {
required_caps = required_caps | DirCaps::CREATE_FILE;
}
let file_caps = dir_entry.child_file_caps(FileCaps::from(&fs_rights_base));
let dir = dir_entry.get_cap(required_caps)?;
let read = file_caps.contains(FileCaps::READ);
let write = file_caps.contains(FileCaps::WRITE)
|| file_caps.contains(FileCaps::ALLOCATE)
|| file_caps.contains(FileCaps::FILESTAT_SET_SIZE);
let file = dir
.open_file(symlink_follow, path.deref(), oflags, read, write, fdflags)
.await?;
drop(dir);
let fd = table.push(Box::new(FileEntry::new(file_caps, file)))?;
Ok(types::Fd::from(fd))
}
}sourcepub fn get<T: Any + Sized>(&self, key: u32) -> Result<&T, Error>
pub fn get<T: Any + Sized>(&self, key: u32) -> Result<&T, Error>
Get an immutable reference to a resource of a given type at a given index. Multiple immutable references can be borrowed at any given time. Borrow failure results in a trapping error.
Examples found in repository?
More examples
src/snapshots/preview_1.rs (line 144)
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async fn fd_close(&mut self, fd: types::Fd) -> Result<(), Error> {
let table = self.table();
let fd = u32::from(fd);
// Fail fast: If not present in table, Badf
if !table.contains_key(fd) {
return Err(Error::badf().context("key not in table"));
}
// fd_close must close either a File or a Dir handle
if table.is::<FileEntry>(fd) {
let _ = table.delete(fd);
} else if table.is::<DirEntry>(fd) {
// We cannot close preopened directories
let dir_entry: &DirEntry = table.get(fd).unwrap();
if dir_entry.preopen_path().is_some() {
return Err(Error::not_supported().context("cannot close propened directory"));
}
drop(dir_entry);
let _ = table.delete(fd);
} else {
return Err(Error::badf().context("key does not refer to file or directory"));
}
Ok(())
}
async fn fd_datasync(&mut self, fd: types::Fd) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::DATASYNC)?
.datasync()
.await?;
Ok(())
}
async fn fd_fdstat_get(&mut self, fd: types::Fd) -> Result<types::Fdstat, Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let file_entry: &mut FileEntry = table.get_mut(fd)?;
let fdstat = file_entry.get_fdstat().await?;
Ok(types::Fdstat::from(&fdstat))
} else if table.is::<DirEntry>(fd) {
let dir_entry: &DirEntry = table.get(fd)?;
let dir_fdstat = dir_entry.get_dir_fdstat();
Ok(types::Fdstat::from(&dir_fdstat))
} else {
Err(Error::badf())
}
}
async fn fd_fdstat_set_flags(
&mut self,
fd: types::Fd,
flags: types::Fdflags,
) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::FDSTAT_SET_FLAGS)?
.set_fdflags(FdFlags::from(flags))
.await
}
async fn fd_fdstat_set_rights(
&mut self,
fd: types::Fd,
fs_rights_base: types::Rights,
fs_rights_inheriting: types::Rights,
) -> Result<(), Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let file_entry: &mut FileEntry = table.get_mut(fd)?;
let file_caps = FileCaps::from(&fs_rights_base);
file_entry.drop_caps_to(file_caps)
} else if table.is::<DirEntry>(fd) {
let dir_entry: &mut DirEntry = table.get_mut(fd)?;
let dir_caps = DirCaps::from(&fs_rights_base);
let file_caps = FileCaps::from(&fs_rights_inheriting);
dir_entry.drop_caps_to(dir_caps, file_caps)
} else {
Err(Error::badf())
}
}
async fn fd_filestat_get(&mut self, fd: types::Fd) -> Result<types::Filestat, Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let filestat = table
.get_file_mut(fd)?
.get_cap_mut(FileCaps::FILESTAT_GET)?
.get_filestat()
.await?;
Ok(filestat.into())
} else if table.is::<DirEntry>(fd) {
let filestat = table
.get_dir(fd)?
.get_cap(DirCaps::FILESTAT_GET)?
.get_filestat()
.await?;
Ok(filestat.into())
} else {
Err(Error::badf())
}
}
async fn fd_filestat_set_size(
&mut self,
fd: types::Fd,
size: types::Filesize,
) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::FILESTAT_SET_SIZE)?
.set_filestat_size(size)
.await?;
Ok(())
}
async fn fd_filestat_set_times(
&mut self,
fd: types::Fd,
atim: types::Timestamp,
mtim: types::Timestamp,
fst_flags: types::Fstflags,
) -> Result<(), Error> {
let fd = u32::from(fd);
let table = self.table();
// Validate flags
let set_atim = fst_flags.contains(types::Fstflags::ATIM);
let set_atim_now = fst_flags.contains(types::Fstflags::ATIM_NOW);
let set_mtim = fst_flags.contains(types::Fstflags::MTIM);
let set_mtim_now = fst_flags.contains(types::Fstflags::MTIM_NOW);
let atim = systimespec(set_atim, atim, set_atim_now).map_err(|e| e.context("atim"))?;
let mtim = systimespec(set_mtim, mtim, set_mtim_now).map_err(|e| e.context("mtim"))?;
if table.is::<FileEntry>(fd) {
table
.get_file_mut(fd)
.expect("checked that entry is file")
.get_cap_mut(FileCaps::FILESTAT_SET_TIMES)?
.set_times(atim, mtim)
.await
} else if table.is::<DirEntry>(fd) {
table
.get_dir(fd)
.expect("checked that entry is dir")
.get_cap(DirCaps::FILESTAT_SET_TIMES)?
.set_times(".", atim, mtim, false)
.await
} else {
Err(Error::badf())
}
}
async fn fd_read<'a>(
&mut self,
fd: types::Fd,
iovs: &types::IovecArray<'a>,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::READ)?;
let mut guest_slices: Vec<wiggle::GuestSliceMut<u8>> =
iovs.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Iovec = iov_ptr.read()?;
Ok(iov.buf.as_array(iov.buf_len).as_slice_mut()?.expect(
"cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)",
))
})
.collect::<Result<_, Error>>()?;
let mut ioslices: Vec<IoSliceMut> = guest_slices
.iter_mut()
.map(|s| IoSliceMut::new(&mut *s))
.collect();
let bytes_read = f.read_vectored(&mut ioslices).await?;
Ok(types::Size::try_from(bytes_read)?)
}
async fn fd_pread<'a>(
&mut self,
fd: types::Fd,
iovs: &types::IovecArray<'a>,
offset: types::Filesize,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::READ | FileCaps::SEEK)?;
let mut guest_slices: Vec<wiggle::GuestSliceMut<u8>> =
iovs.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Iovec = iov_ptr.read()?;
Ok(iov.buf.as_array(iov.buf_len).as_slice_mut()?.expect(
"cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)",
))
})
.collect::<Result<_, Error>>()?;
let mut ioslices: Vec<IoSliceMut> = guest_slices
.iter_mut()
.map(|s| IoSliceMut::new(&mut *s))
.collect();
let bytes_read = f.read_vectored_at(&mut ioslices, offset).await?;
Ok(types::Size::try_from(bytes_read)?)
}
async fn fd_write<'a>(
&mut self,
fd: types::Fd,
ciovs: &types::CiovecArray<'a>,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::WRITE)?;
let guest_slices: Vec<wiggle::GuestSlice<u8>> = ciovs
.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Ciovec = iov_ptr.read()?;
Ok(iov
.buf
.as_array(iov.buf_len)
.as_slice()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)"))
})
.collect::<Result<_, Error>>()?;
let ioslices: Vec<IoSlice> = guest_slices
.iter()
.map(|s| IoSlice::new(s.deref()))
.collect();
let bytes_written = f.write_vectored(&ioslices).await?;
Ok(types::Size::try_from(bytes_written)?)
}
async fn fd_pwrite<'a>(
&mut self,
fd: types::Fd,
ciovs: &types::CiovecArray<'a>,
offset: types::Filesize,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::WRITE | FileCaps::SEEK)?;
let guest_slices: Vec<wiggle::GuestSlice<u8>> = ciovs
.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Ciovec = iov_ptr.read()?;
Ok(iov
.buf
.as_array(iov.buf_len)
.as_slice()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)"))
})
.collect::<Result<_, Error>>()?;
let ioslices: Vec<IoSlice> = guest_slices
.iter()
.map(|s| IoSlice::new(s.deref()))
.collect();
let bytes_written = f.write_vectored_at(&ioslices, offset).await?;
Ok(types::Size::try_from(bytes_written)?)
}
async fn fd_prestat_get(&mut self, fd: types::Fd) -> Result<types::Prestat, Error> {
let table = self.table();
let dir_entry: &DirEntry = table.get(u32::from(fd)).map_err(|_| Error::badf())?;
if let Some(ref preopen) = dir_entry.preopen_path() {
let path_str = preopen.to_str().ok_or_else(|| Error::not_supported())?;
let pr_name_len = u32::try_from(path_str.as_bytes().len())?;
Ok(types::Prestat::Dir(types::PrestatDir { pr_name_len }))
} else {
Err(Error::not_supported().context("file is not a preopen"))
}
}
async fn fd_prestat_dir_name<'a>(
&mut self,
fd: types::Fd,
path: &GuestPtr<'a, u8>,
path_max_len: types::Size,
) -> Result<(), Error> {
let table = self.table();
let dir_entry: &DirEntry = table.get(u32::from(fd)).map_err(|_| Error::not_dir())?;
if let Some(ref preopen) = dir_entry.preopen_path() {
let path_bytes = preopen
.to_str()
.ok_or_else(|| Error::not_supported())?
.as_bytes();
let path_len = path_bytes.len();
if path_len < path_max_len as usize {
return Err(Error::name_too_long());
}
let mut p_memory = path
.as_array(path_len as u32)
.as_slice_mut()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)");
p_memory.copy_from_slice(path_bytes);
Ok(())
} else {
Err(Error::not_supported())
}
}sourcepub fn get_mut<T: Any + Sized>(&mut self, key: u32) -> Result<&mut T, Error>
pub fn get_mut<T: Any + Sized>(&mut self, key: u32) -> Result<&mut T, Error>
Get a mutable reference to a resource of a given type at a given index. Only one mutable reference can be borrowed at any given time. Borrow failure results in a trapping error.
Examples found in repository?
More examples
src/snapshots/preview_1.rs (line 170)
166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214
async fn fd_fdstat_get(&mut self, fd: types::Fd) -> Result<types::Fdstat, Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let file_entry: &mut FileEntry = table.get_mut(fd)?;
let fdstat = file_entry.get_fdstat().await?;
Ok(types::Fdstat::from(&fdstat))
} else if table.is::<DirEntry>(fd) {
let dir_entry: &DirEntry = table.get(fd)?;
let dir_fdstat = dir_entry.get_dir_fdstat();
Ok(types::Fdstat::from(&dir_fdstat))
} else {
Err(Error::badf())
}
}
async fn fd_fdstat_set_flags(
&mut self,
fd: types::Fd,
flags: types::Fdflags,
) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::FDSTAT_SET_FLAGS)?
.set_fdflags(FdFlags::from(flags))
.await
}
async fn fd_fdstat_set_rights(
&mut self,
fd: types::Fd,
fs_rights_base: types::Rights,
fs_rights_inheriting: types::Rights,
) -> Result<(), Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let file_entry: &mut FileEntry = table.get_mut(fd)?;
let file_caps = FileCaps::from(&fs_rights_base);
file_entry.drop_caps_to(file_caps)
} else if table.is::<DirEntry>(fd) {
let dir_entry: &mut DirEntry = table.get_mut(fd)?;
let dir_caps = DirCaps::from(&fs_rights_base);
let file_caps = FileCaps::from(&fs_rights_inheriting);
dir_entry.drop_caps_to(dir_caps, file_caps)
} else {
Err(Error::badf())
}
}sourcepub fn delete(&mut self, key: u32) -> Option<Box<dyn Any + Send + Sync>>
pub fn delete(&mut self, key: u32) -> Option<Box<dyn Any + Send + Sync>>
Remove a resource at a given index from the table. Returns the resource if it was present.
Examples found in repository?
src/snapshots/preview_1.rs (line 141)
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async fn fd_close(&mut self, fd: types::Fd) -> Result<(), Error> {
let table = self.table();
let fd = u32::from(fd);
// Fail fast: If not present in table, Badf
if !table.contains_key(fd) {
return Err(Error::badf().context("key not in table"));
}
// fd_close must close either a File or a Dir handle
if table.is::<FileEntry>(fd) {
let _ = table.delete(fd);
} else if table.is::<DirEntry>(fd) {
// We cannot close preopened directories
let dir_entry: &DirEntry = table.get(fd).unwrap();
if dir_entry.preopen_path().is_some() {
return Err(Error::not_supported().context("cannot close propened directory"));
}
drop(dir_entry);
let _ = table.delete(fd);
} else {
return Err(Error::badf().context("key does not refer to file or directory"));
}
Ok(())
}
async fn fd_datasync(&mut self, fd: types::Fd) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::DATASYNC)?
.datasync()
.await?;
Ok(())
}
async fn fd_fdstat_get(&mut self, fd: types::Fd) -> Result<types::Fdstat, Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let file_entry: &mut FileEntry = table.get_mut(fd)?;
let fdstat = file_entry.get_fdstat().await?;
Ok(types::Fdstat::from(&fdstat))
} else if table.is::<DirEntry>(fd) {
let dir_entry: &DirEntry = table.get(fd)?;
let dir_fdstat = dir_entry.get_dir_fdstat();
Ok(types::Fdstat::from(&dir_fdstat))
} else {
Err(Error::badf())
}
}
async fn fd_fdstat_set_flags(
&mut self,
fd: types::Fd,
flags: types::Fdflags,
) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::FDSTAT_SET_FLAGS)?
.set_fdflags(FdFlags::from(flags))
.await
}
async fn fd_fdstat_set_rights(
&mut self,
fd: types::Fd,
fs_rights_base: types::Rights,
fs_rights_inheriting: types::Rights,
) -> Result<(), Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let file_entry: &mut FileEntry = table.get_mut(fd)?;
let file_caps = FileCaps::from(&fs_rights_base);
file_entry.drop_caps_to(file_caps)
} else if table.is::<DirEntry>(fd) {
let dir_entry: &mut DirEntry = table.get_mut(fd)?;
let dir_caps = DirCaps::from(&fs_rights_base);
let file_caps = FileCaps::from(&fs_rights_inheriting);
dir_entry.drop_caps_to(dir_caps, file_caps)
} else {
Err(Error::badf())
}
}
async fn fd_filestat_get(&mut self, fd: types::Fd) -> Result<types::Filestat, Error> {
let table = self.table();
let fd = u32::from(fd);
if table.is::<FileEntry>(fd) {
let filestat = table
.get_file_mut(fd)?
.get_cap_mut(FileCaps::FILESTAT_GET)?
.get_filestat()
.await?;
Ok(filestat.into())
} else if table.is::<DirEntry>(fd) {
let filestat = table
.get_dir(fd)?
.get_cap(DirCaps::FILESTAT_GET)?
.get_filestat()
.await?;
Ok(filestat.into())
} else {
Err(Error::badf())
}
}
async fn fd_filestat_set_size(
&mut self,
fd: types::Fd,
size: types::Filesize,
) -> Result<(), Error> {
self.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::FILESTAT_SET_SIZE)?
.set_filestat_size(size)
.await?;
Ok(())
}
async fn fd_filestat_set_times(
&mut self,
fd: types::Fd,
atim: types::Timestamp,
mtim: types::Timestamp,
fst_flags: types::Fstflags,
) -> Result<(), Error> {
let fd = u32::from(fd);
let table = self.table();
// Validate flags
let set_atim = fst_flags.contains(types::Fstflags::ATIM);
let set_atim_now = fst_flags.contains(types::Fstflags::ATIM_NOW);
let set_mtim = fst_flags.contains(types::Fstflags::MTIM);
let set_mtim_now = fst_flags.contains(types::Fstflags::MTIM_NOW);
let atim = systimespec(set_atim, atim, set_atim_now).map_err(|e| e.context("atim"))?;
let mtim = systimespec(set_mtim, mtim, set_mtim_now).map_err(|e| e.context("mtim"))?;
if table.is::<FileEntry>(fd) {
table
.get_file_mut(fd)
.expect("checked that entry is file")
.get_cap_mut(FileCaps::FILESTAT_SET_TIMES)?
.set_times(atim, mtim)
.await
} else if table.is::<DirEntry>(fd) {
table
.get_dir(fd)
.expect("checked that entry is dir")
.get_cap(DirCaps::FILESTAT_SET_TIMES)?
.set_times(".", atim, mtim, false)
.await
} else {
Err(Error::badf())
}
}
async fn fd_read<'a>(
&mut self,
fd: types::Fd,
iovs: &types::IovecArray<'a>,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::READ)?;
let mut guest_slices: Vec<wiggle::GuestSliceMut<u8>> =
iovs.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Iovec = iov_ptr.read()?;
Ok(iov.buf.as_array(iov.buf_len).as_slice_mut()?.expect(
"cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)",
))
})
.collect::<Result<_, Error>>()?;
let mut ioslices: Vec<IoSliceMut> = guest_slices
.iter_mut()
.map(|s| IoSliceMut::new(&mut *s))
.collect();
let bytes_read = f.read_vectored(&mut ioslices).await?;
Ok(types::Size::try_from(bytes_read)?)
}
async fn fd_pread<'a>(
&mut self,
fd: types::Fd,
iovs: &types::IovecArray<'a>,
offset: types::Filesize,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::READ | FileCaps::SEEK)?;
let mut guest_slices: Vec<wiggle::GuestSliceMut<u8>> =
iovs.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Iovec = iov_ptr.read()?;
Ok(iov.buf.as_array(iov.buf_len).as_slice_mut()?.expect(
"cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)",
))
})
.collect::<Result<_, Error>>()?;
let mut ioslices: Vec<IoSliceMut> = guest_slices
.iter_mut()
.map(|s| IoSliceMut::new(&mut *s))
.collect();
let bytes_read = f.read_vectored_at(&mut ioslices, offset).await?;
Ok(types::Size::try_from(bytes_read)?)
}
async fn fd_write<'a>(
&mut self,
fd: types::Fd,
ciovs: &types::CiovecArray<'a>,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::WRITE)?;
let guest_slices: Vec<wiggle::GuestSlice<u8>> = ciovs
.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Ciovec = iov_ptr.read()?;
Ok(iov
.buf
.as_array(iov.buf_len)
.as_slice()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)"))
})
.collect::<Result<_, Error>>()?;
let ioslices: Vec<IoSlice> = guest_slices
.iter()
.map(|s| IoSlice::new(s.deref()))
.collect();
let bytes_written = f.write_vectored(&ioslices).await?;
Ok(types::Size::try_from(bytes_written)?)
}
async fn fd_pwrite<'a>(
&mut self,
fd: types::Fd,
ciovs: &types::CiovecArray<'a>,
offset: types::Filesize,
) -> Result<types::Size, Error> {
let f = self
.table()
.get_file_mut(u32::from(fd))?
.get_cap_mut(FileCaps::WRITE | FileCaps::SEEK)?;
let guest_slices: Vec<wiggle::GuestSlice<u8>> = ciovs
.iter()
.map(|iov_ptr| {
let iov_ptr = iov_ptr?;
let iov: types::Ciovec = iov_ptr.read()?;
Ok(iov
.buf
.as_array(iov.buf_len)
.as_slice()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)"))
})
.collect::<Result<_, Error>>()?;
let ioslices: Vec<IoSlice> = guest_slices
.iter()
.map(|s| IoSlice::new(s.deref()))
.collect();
let bytes_written = f.write_vectored_at(&ioslices, offset).await?;
Ok(types::Size::try_from(bytes_written)?)
}
async fn fd_prestat_get(&mut self, fd: types::Fd) -> Result<types::Prestat, Error> {
let table = self.table();
let dir_entry: &DirEntry = table.get(u32::from(fd)).map_err(|_| Error::badf())?;
if let Some(ref preopen) = dir_entry.preopen_path() {
let path_str = preopen.to_str().ok_or_else(|| Error::not_supported())?;
let pr_name_len = u32::try_from(path_str.as_bytes().len())?;
Ok(types::Prestat::Dir(types::PrestatDir { pr_name_len }))
} else {
Err(Error::not_supported().context("file is not a preopen"))
}
}
async fn fd_prestat_dir_name<'a>(
&mut self,
fd: types::Fd,
path: &GuestPtr<'a, u8>,
path_max_len: types::Size,
) -> Result<(), Error> {
let table = self.table();
let dir_entry: &DirEntry = table.get(u32::from(fd)).map_err(|_| Error::not_dir())?;
if let Some(ref preopen) = dir_entry.preopen_path() {
let path_bytes = preopen
.to_str()
.ok_or_else(|| Error::not_supported())?
.as_bytes();
let path_len = path_bytes.len();
if path_len < path_max_len as usize {
return Err(Error::name_too_long());
}
let mut p_memory = path
.as_array(path_len as u32)
.as_slice_mut()?
.expect("cannot use with shared memories; see https://github.com/bytecodealliance/wasmtime/issues/5235 (TODO)");
p_memory.copy_from_slice(path_bytes);
Ok(())
} else {
Err(Error::not_supported())
}
}
async fn fd_renumber(&mut self, from: types::Fd, to: types::Fd) -> Result<(), Error> {
let table = self.table();
let from = u32::from(from);
let to = u32::from(to);
if !table.contains_key(from) {
return Err(Error::badf());
}
if table.is_preopen(from) || table.is_preopen(to) {
return Err(Error::not_supported().context("cannot renumber a preopen"));
}
let from_entry = table
.delete(from)
.expect("we checked that table contains from");
table.insert_at(to, from_entry);
Ok(())
}