wasmer_wasix/syscalls/wasi/
fd_dup.rs

1use super::*;
2use crate::syscalls::*;
3
4/// ### `fd_dup()`
5/// Duplicates the file handle
6/// Inputs:
7/// - `Fd fd`
8///   File handle to be cloned
9/// Outputs:
10/// - `Fd fd`
11///   The new file handle that is a duplicate of the original
12#[instrument(level = "trace", skip_all, fields(%fd, ret_fd = field::Empty), ret)]
13pub fn fd_dup<M: MemorySize>(
14    mut ctx: FunctionEnvMut<'_, WasiEnv>,
15    fd: WasiFd,
16    ret_fd: WasmPtr<WasiFd, M>,
17) -> Result<Errno, WasiError> {
18    WasiEnv::do_pending_operations(&mut ctx)?;
19
20    let copied_fd = wasi_try_ok!(fd_dup_internal(&mut ctx, fd, 0, false));
21    let env = ctx.data();
22
23    #[cfg(feature = "journal")]
24    if env.enable_journal {
25        JournalEffector::save_fd_duplicate(&mut ctx, fd, copied_fd, false).map_err(|err| {
26            tracing::error!("failed to save file descriptor duplicate event - {}", err);
27            WasiError::Exit(ExitCode::from(Errno::Fault))
28        })?;
29    }
30
31    Span::current().record("ret_fd", copied_fd);
32    let env = ctx.data();
33    let (memory, state) = unsafe { env.get_memory_and_wasi_state(&ctx, 0) };
34    wasi_try_mem_ok!(ret_fd.write(&memory, copied_fd));
35
36    Ok(Errno::Success)
37}
wasmer_wasix/syscalls/wasi/fd_dup.rs

wasmer_wasix/syscalls/wasi/
fd_dup.rs
