wasmer_wasix/syscalls/wasi/
fd_datasync.rs

1use super::*;
2use crate::fs::FlushPoller;
3use crate::syscalls::*;
4
5/// ### `fd_datasync()`
6/// Synchronize the file data to disk
7/// Inputs:
8/// - `Fd fd`
9///     The file descriptor to sync
10#[instrument(level = "trace", skip_all, fields(%fd), ret)]
11pub fn fd_datasync(mut ctx: FunctionEnvMut<'_, WasiEnv>, fd: WasiFd) -> Result<Errno, WasiError> {
12    WasiEnv::do_pending_operations(&mut ctx)?;
13
14    let env = ctx.data();
15    let (_, state) = unsafe { env.get_memory_and_wasi_state(&ctx, 0) };
16    let fd_entry = wasi_try_ok!(state.fs.get_fd(fd));
17    if !fd_entry.inner.rights.contains(Rights::FD_DATASYNC) {
18        return Ok(Errno::Access);
19    }
20
21    let file = {
22        let guard = fd_entry.inode.read();
23        match guard.deref() {
24            Kind::File {
25                handle: Some(file), ..
26            } => file.clone(),
27            Kind::Dir { .. } => return Ok(Errno::Isdir),
28            Kind::Buffer { .. } => return Ok(Errno::Success),
29            // Linux fdatasync(2) returns EINVAL for fds bound to pipes, sockets, etc.
30            _ => return Ok(Errno::Inval),
31        }
32    };
33    drop(fd_entry);
34
35    Ok(wasi_try_ok!(__asyncify(&mut ctx, None, async move {
36        FlushPoller { file }.await.map(|_| Errno::Success)
37    })?))
38}
wasmer_wasix/syscalls/wasi/fd_datasync.rs

wasmer_wasix/syscalls/wasi/
fd_datasync.rs
