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    os::epoll::EpollState,
9    state::PollEventSet,
10    syscalls::*,
11};
12use std::sync::Arc;
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 epoll_state = Arc::new(EpollState::new());
51
52    let inode = state.fs.create_inode_with_default_stat(
53        inodes,
54        Kind::Epoll { state: epoll_state },
55        false,
56        "pipe".to_string().into(),
57    );
58
59    let rights = Rights::POLL_FD_READWRITE | Rights::FD_FDSTAT_SET_FLAGS;
60    let fd = wasi_try_ok_ok!(if let Some(fd) = with_fd {
61        state
62            .fs
63            .with_fd(
64                rights,
65                rights,
66                Fdflags::empty(),
67                Fdflagsext::empty(),
68                0,
69                inode,
70                fd,
71            )
72            .map(|_| fd)
73    } else {
74        state.fs.create_fd(
75            rights,
76            rights,
77            Fdflags::empty(),
78            Fdflagsext::empty(),
79            0,
80            inode,
81        )
82    });
83
84    Ok(Ok(fd))
85}
wasmer_wasix/syscalls/wasix/epoll_create.rs

wasmer_wasix/syscalls/wasix/
epoll_create.rs
