wasmer_wasix/syscalls/wasix/
epoll_create.rs

1use serde::{Deserialize, Serialize};
2use wasmer_wasix_types::wasi::{SubscriptionClock, Userdata};
3
4use super::*;
5use crate::{
6    WasiInodes,
7    fs::{InodeValFilePollGuard, InodeValFilePollGuardJoin},
8    state::PollEventSet,
9    syscalls::*,
10};
11use std::sync::Mutex as StdMutex;
12use tokio::sync::Mutex as AsyncMutex;
13
14/// ### `epoll_create()`
15/// Create an epoll interest list
16#[instrument(level = "trace", skip_all, fields(timeout_ms = field::Empty, fd_guards = field::Empty, seen = field::Empty), ret)]
17pub fn epoll_create<M: MemorySize + 'static>(
18    mut ctx: FunctionEnvMut<'_, WasiEnv>,
19    ret_fd: WasmPtr<WasiFd, M>,
20) -> Result<Errno, WasiError> {
21    WasiEnv::do_pending_operations(&mut ctx)?;
22
23    let fd = wasi_try_ok!(epoll_create_internal(&mut ctx, None)?);
24    let env = ctx.data();
25
26    #[cfg(feature = "journal")]
27    if env.enable_journal {
28        JournalEffector::save_epoll_create(&mut ctx, fd).map_err(|err| {
29            tracing::error!("failed to save epoll_create event - {}", err);
30            WasiError::Exit(ExitCode::from(Errno::Fault))
31        })?;
32    }
33
34    Span::current().record("fd", fd);
35
36    let env = ctx.data();
37    let (memory, state, inodes) = unsafe { env.get_memory_and_wasi_state_and_inodes(&ctx, 0) };
38    wasi_try_mem_ok!(ret_fd.write(&memory, fd));
39
40    Ok(Errno::Success)
41}
42
43pub fn epoll_create_internal(
44    ctx: &mut FunctionEnvMut<'_, WasiEnv>,
45    with_fd: Option<WasiFd>,
46) -> Result<Result<WasiFd, Errno>, WasiError> {
47    let env = ctx.data();
48    let (memory, state, inodes) = unsafe { env.get_memory_and_wasi_state_and_inodes(&ctx, 0) };
49
50    let (tx, rx) = tokio::sync::watch::channel(Default::default());
51
52    let inode = state.fs.create_inode_with_default_stat(
53        inodes,
54        Kind::Epoll {
55            subscriptions: Arc::new(StdMutex::new(HashMap::new())),
56            tx: Arc::new(tx),
57            rx: Arc::new(AsyncMutex::new(rx)),
58        },
59        false,
60        "pipe".to_string().into(),
61    );
62
63    let rights = Rights::POLL_FD_READWRITE | Rights::FD_FDSTAT_SET_FLAGS;
64    let fd = wasi_try_ok_ok!(if let Some(fd) = with_fd {
65        state
66            .fs
67            .with_fd(
68                rights,
69                rights,
70                Fdflags::empty(),
71                Fdflagsext::empty(),
72                0,
73                inode,
74                fd,
75            )
76            .map(|_| fd)
77    } else {
78        state.fs.create_fd(
79            rights,
80            rights,
81            Fdflags::empty(),
82            Fdflagsext::empty(),
83            0,
84            inode,
85        )
86    });
87
88    Ok(Ok(fd))
89}
wasmer_wasix/syscalls/wasix/epoll_create.rs

wasmer_wasix/syscalls/wasix/
epoll_create.rs
