Trait wasi_common::file::WasiFile

source · 
pub trait WasiFile: Send + Sync {

Show 26 methods    fn as_any(&self) -> &dyn Any;
    fn get_filetype<'life0, 'async_trait>(
        &'life0 mut self
    ) -> Pin<Box<dyn Future<Output = Result<FileType, Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait;

    fn pollable(&self) -> Option<BorrowedFd<'_>> { ... }
    fn isatty(&mut self) -> bool { ... }
    fn sock_accept<'life0, 'async_trait>(
        &'life0 mut self,
        _fdflags: FdFlags
    ) -> Pin<Box<dyn Future<Output = Result<Box<dyn WasiFile>, Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn sock_recv<'a, 'life0, 'life1, 'async_trait>(
        &'life0 mut self,
        _ri_data: &'life1 mut [IoSliceMut<'a>],
        _ri_flags: RiFlags
    ) -> Pin<Box<dyn Future<Output = Result<(u64, RoFlags), Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'a: 'async_trait,
        'life0: 'async_trait,
        'life1: 'async_trait,
    { ... }
    fn sock_send<'a, 'life0, 'life1, 'async_trait>(
        &'life0 mut self,
        _si_data: &'life1 [IoSlice<'a>],
        _si_flags: SiFlags
    ) -> Pin<Box<dyn Future<Output = Result<u64, Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'a: 'async_trait,
        'life0: 'async_trait,
        'life1: 'async_trait,
    { ... }
    fn sock_shutdown<'life0, 'async_trait>(
        &'life0 mut self,
        _how: SdFlags
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn datasync<'life0, 'async_trait>(
        &'life0 mut self
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn sync<'life0, 'async_trait>(
        &'life0 mut self
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn get_fdflags<'life0, 'async_trait>(
        &'life0 mut self
    ) -> Pin<Box<dyn Future<Output = Result<FdFlags, Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn set_fdflags<'life0, 'async_trait>(
        &'life0 mut self,
        _flags: FdFlags
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn get_filestat<'life0, 'async_trait>(
        &'life0 mut self
    ) -> Pin<Box<dyn Future<Output = Result<Filestat, Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn set_filestat_size<'life0, 'async_trait>(
        &'life0 mut self,
        _size: u64
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn advise<'life0, 'async_trait>(
        &'life0 mut self,
        _offset: u64,
        _len: u64,
        _advice: Advice
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn allocate<'life0, 'async_trait>(
        &'life0 mut self,
        _offset: u64,
        _len: u64
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn set_times<'life0, 'async_trait>(
        &'life0 mut self,
        _atime: Option<SystemTimeSpec>,
        _mtime: Option<SystemTimeSpec>
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn read_vectored<'a, 'life0, 'life1, 'async_trait>(
        &'life0 mut self,
        _bufs: &'life1 mut [IoSliceMut<'a>]
    ) -> Pin<Box<dyn Future<Output = Result<u64, Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'a: 'async_trait,
        'life0: 'async_trait,
        'life1: 'async_trait,
    { ... }
    fn read_vectored_at<'a, 'life0, 'life1, 'async_trait>(
        &'life0 mut self,
        _bufs: &'life1 mut [IoSliceMut<'a>],
        _offset: u64
    ) -> Pin<Box<dyn Future<Output = Result<u64, Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'a: 'async_trait,
        'life0: 'async_trait,
        'life1: 'async_trait,
    { ... }
    fn write_vectored<'a, 'life0, 'life1, 'async_trait>(
        &'life0 mut self,
        _bufs: &'life1 [IoSlice<'a>]
    ) -> Pin<Box<dyn Future<Output = Result<u64, Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'a: 'async_trait,
        'life0: 'async_trait,
        'life1: 'async_trait,
    { ... }
    fn write_vectored_at<'a, 'life0, 'life1, 'async_trait>(
        &'life0 mut self,
        _bufs: &'life1 [IoSlice<'a>],
        _offset: u64
    ) -> Pin<Box<dyn Future<Output = Result<u64, Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'a: 'async_trait,
        'life0: 'async_trait,
        'life1: 'async_trait,
    { ... }
    fn seek<'life0, 'async_trait>(
        &'life0 mut self,
        _pos: SeekFrom
    ) -> Pin<Box<dyn Future<Output = Result<u64, Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn peek<'life0, 'life1, 'async_trait>(
        &'life0 mut self,
        _buf: &'life1 mut [u8]
    ) -> Pin<Box<dyn Future<Output = Result<u64, Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
        'life1: 'async_trait,
    { ... }
    fn num_ready_bytes<'life0, 'async_trait>(
        &'life0 self
    ) -> Pin<Box<dyn Future<Output = Result<u64, Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn readable<'life0, 'async_trait>(
        &'life0 self
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }
    fn writable<'life0, 'async_trait>(
        &'life0 self
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>
    where
        Self: 'async_trait,
        'life0: 'async_trait,
    { ... }

}

Required Methods§

Provided Methods§

Examples found in repository?
src/ctx.rs (line 109)
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    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
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 1050)
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    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))
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 1089)
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    async fn sock_recv<'a>(
        &mut self,
        fd: types::Fd,
        ri_data: &types::IovecArray<'a>,
        ri_flags: types::Riflags,
    ) -> Result<(types::Size, types::Roflags), Error> {
        let f = self
            .table()
            .get_file_mut(u32::from(fd))?
            .get_cap_mut(FileCaps::READ)?;

        let mut guest_slices: Vec<wiggle::GuestSliceMut<u8>> =
            ri_data
                .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, roflags) = f.sock_recv(&mut ioslices, RiFlags::from(ri_flags)).await?;
        Ok((types::Size::try_from(bytes_read)?, roflags.into()))
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 1121)
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    async fn sock_send<'a>(
        &mut self,
        fd: types::Fd,
        si_data: &types::CiovecArray<'a>,
        _si_flags: types::Siflags,
    ) -> 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>> = si_data
            .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.sock_send(&ioslices, SiFlags::empty()).await?;

        Ok(types::Size::try_from(bytes_written)?)
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 1132)
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    async fn sock_shutdown(&mut self, fd: types::Fd, how: types::Sdflags) -> Result<(), Error> {
        let f = self
            .table()
            .get_file_mut(u32::from(fd))?
            .get_cap_mut(FileCaps::FDSTAT_SET_FLAGS)?;

        f.sock_shutdown(SdFlags::from(how)).await
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 161)
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    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(())
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 502)
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    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(())
    }
Examples found in repository?
src/file.rs (line 264)
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    pub async fn get_fdstat(&mut self) -> Result<FdStat, Error> {
        Ok(FdStat {
            filetype: self.file.get_filetype().await?,
            caps: self.caps,
            flags: self.file.get_fdflags().await?,
        })
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 190)
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    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
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 223)
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    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())
        }
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 246)
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    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(())
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 112)
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    async fn fd_advise(
        &mut self,
        fd: types::Fd,
        offset: types::Filesize,
        len: types::Filesize,
        advice: types::Advice,
    ) -> Result<(), Error> {
        self.table()
            .get_file_mut(u32::from(fd))?
            .get_cap_mut(FileCaps::ADVISE)?
            .advise(offset, len, advice.into())
            .await?;
        Ok(())
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 126)
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    async fn fd_allocate(
        &mut self,
        fd: types::Fd,
        offset: types::Filesize,
        len: types::Filesize,
    ) -> Result<(), Error> {
        self.table()
            .get_file_mut(u32::from(fd))?
            .get_cap_mut(FileCaps::ALLOCATE)?
            .allocate(offset, len)
            .await?;
        Ok(())
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 274)
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    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())
        }
    }
Examples found in repository?
src/snapshots/preview_0.rs (line 551)
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    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)?)
    }
More examples
Hide additional examples
src/snapshots/preview_1.rs (line 314)
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    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)?)
    }
Examples found in repository?
src/snapshots/preview_0.rs (line 582)
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    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)?)
    }
More examples
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src/snapshots/preview_1.rs (line 345)
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    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)?)
    }
Examples found in repository?
src/snapshots/preview_0.rs (line 613)
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    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)?)
    }
More examples
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src/snapshots/preview_1.rs (line 376)
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    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)?)
    }
Examples found in repository?
src/snapshots/preview_0.rs (line 646)
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    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)?)
    }
More examples
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src/snapshots/preview_1.rs (line 409)
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    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)?)
    }
Examples found in repository?
src/snapshots/preview_1.rs (line 493)
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    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)
    }

Implementors§