Initial reorg.
This is largely the same as #305, but updated for the current tree.
This commit is contained in:
Dan Gohman
317
crates/wasi-common/src/hostcalls_impl/misc.rs
Normal file
317
crates/wasi-common/src/hostcalls_impl/misc.rs
Normal file
@@ -0,0 +1,317 @@
|
||||
#![allow(non_camel_case_types)]
|
||||
use crate::ctx::WasiCtx;
|
||||
use crate::fdentry::Descriptor;
|
||||
use crate::memory::*;
|
||||
use crate::sys::hostcalls_impl;
|
||||
use crate::{wasi, wasi32, Error, Result};
|
||||
use log::trace;
|
||||
use std::convert::TryFrom;
|
||||
|
||||
pub(crate) fn args_get(
|
||||
wasi_ctx: &WasiCtx,
|
||||
memory: &mut [u8],
|
||||
argv_ptr: wasi32::uintptr_t,
|
||||
argv_buf: wasi32::uintptr_t,
|
||||
) -> Result<()> {
|
||||
trace!(
|
||||
"args_get(argv_ptr={:#x?}, argv_buf={:#x?})",
|
||||
argv_ptr,
|
||||
argv_buf,
|
||||
);
|
||||
|
||||
let mut argv_buf_offset = 0;
|
||||
let mut argv = vec![];
|
||||
|
||||
for arg in &wasi_ctx.args {
|
||||
let arg_bytes = arg.as_bytes_with_nul();
|
||||
let arg_ptr = argv_buf + argv_buf_offset;
|
||||
|
||||
enc_slice_of_u8(memory, arg_bytes, arg_ptr)?;
|
||||
|
||||
argv.push(arg_ptr);
|
||||
|
||||
let len = wasi32::uintptr_t::try_from(arg_bytes.len())?;
|
||||
argv_buf_offset = argv_buf_offset.checked_add(len).ok_or(Error::EOVERFLOW)?;
|
||||
}
|
||||
|
||||
enc_slice_of_wasi32_uintptr(memory, argv.as_slice(), argv_ptr)
|
||||
}
|
||||
|
||||
pub(crate) fn args_sizes_get(
|
||||
wasi_ctx: &WasiCtx,
|
||||
memory: &mut [u8],
|
||||
argc_ptr: wasi32::uintptr_t,
|
||||
argv_buf_size_ptr: wasi32::uintptr_t,
|
||||
) -> Result<()> {
|
||||
trace!(
|
||||
"args_sizes_get(argc_ptr={:#x?}, argv_buf_size_ptr={:#x?})",
|
||||
argc_ptr,
|
||||
argv_buf_size_ptr,
|
||||
);
|
||||
|
||||
let argc = wasi_ctx.args.len();
|
||||
let argv_size = wasi_ctx
|
||||
.args
|
||||
.iter()
|
||||
.map(|arg| arg.as_bytes_with_nul().len())
|
||||
.sum();
|
||||
|
||||
trace!(" | *argc_ptr={:?}", argc);
|
||||
|
||||
enc_usize_byref(memory, argc_ptr, argc)?;
|
||||
|
||||
trace!(" | *argv_buf_size_ptr={:?}", argv_size);
|
||||
|
||||
enc_usize_byref(memory, argv_buf_size_ptr, argv_size)
|
||||
}
|
||||
|
||||
pub(crate) fn environ_get(
|
||||
wasi_ctx: &WasiCtx,
|
||||
memory: &mut [u8],
|
||||
environ_ptr: wasi32::uintptr_t,
|
||||
environ_buf: wasi32::uintptr_t,
|
||||
) -> Result<()> {
|
||||
trace!(
|
||||
"environ_get(environ_ptr={:#x?}, environ_buf={:#x?})",
|
||||
environ_ptr,
|
||||
environ_buf,
|
||||
);
|
||||
|
||||
let mut environ_buf_offset = 0;
|
||||
let mut environ = vec![];
|
||||
|
||||
for pair in &wasi_ctx.env {
|
||||
let env_bytes = pair.as_bytes_with_nul();
|
||||
let env_ptr = environ_buf + environ_buf_offset;
|
||||
|
||||
enc_slice_of_u8(memory, env_bytes, env_ptr)?;
|
||||
|
||||
environ.push(env_ptr);
|
||||
|
||||
let len = wasi32::uintptr_t::try_from(env_bytes.len())?;
|
||||
environ_buf_offset = environ_buf_offset
|
||||
.checked_add(len)
|
||||
.ok_or(Error::EOVERFLOW)?;
|
||||
}
|
||||
|
||||
enc_slice_of_wasi32_uintptr(memory, environ.as_slice(), environ_ptr)
|
||||
}
|
||||
|
||||
pub(crate) fn environ_sizes_get(
|
||||
wasi_ctx: &WasiCtx,
|
||||
memory: &mut [u8],
|
||||
environ_count_ptr: wasi32::uintptr_t,
|
||||
environ_size_ptr: wasi32::uintptr_t,
|
||||
) -> Result<()> {
|
||||
trace!(
|
||||
"environ_sizes_get(environ_count_ptr={:#x?}, environ_size_ptr={:#x?})",
|
||||
environ_count_ptr,
|
||||
environ_size_ptr,
|
||||
);
|
||||
|
||||
let environ_count = wasi_ctx.env.len();
|
||||
let environ_size = wasi_ctx
|
||||
.env
|
||||
.iter()
|
||||
.try_fold(0, |acc: u32, pair| {
|
||||
acc.checked_add(pair.as_bytes_with_nul().len() as u32)
|
||||
})
|
||||
.ok_or(Error::EOVERFLOW)?;
|
||||
|
||||
trace!(" | *environ_count_ptr={:?}", environ_count);
|
||||
|
||||
enc_usize_byref(memory, environ_count_ptr, environ_count)?;
|
||||
|
||||
trace!(" | *environ_size_ptr={:?}", environ_size);
|
||||
|
||||
enc_usize_byref(memory, environ_size_ptr, environ_size as usize)
|
||||
}
|
||||
|
||||
pub(crate) fn random_get(
|
||||
memory: &mut [u8],
|
||||
buf_ptr: wasi32::uintptr_t,
|
||||
buf_len: wasi32::size_t,
|
||||
) -> Result<()> {
|
||||
use rand::{thread_rng, RngCore};
|
||||
|
||||
trace!("random_get(buf_ptr={:#x?}, buf_len={:?})", buf_ptr, buf_len);
|
||||
|
||||
let buf = dec_slice_of_mut_u8(memory, buf_ptr, buf_len)?;
|
||||
|
||||
thread_rng().fill_bytes(buf);
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub(crate) fn clock_res_get(
|
||||
memory: &mut [u8],
|
||||
clock_id: wasi::__wasi_clockid_t,
|
||||
resolution_ptr: wasi32::uintptr_t,
|
||||
) -> Result<()> {
|
||||
trace!(
|
||||
"clock_res_get(clock_id={:?}, resolution_ptr={:#x?})",
|
||||
clock_id,
|
||||
resolution_ptr,
|
||||
);
|
||||
|
||||
let resolution = hostcalls_impl::clock_res_get(clock_id)?;
|
||||
|
||||
trace!(" | *resolution_ptr={:?}", resolution);
|
||||
|
||||
enc_timestamp_byref(memory, resolution_ptr, resolution)
|
||||
}
|
||||
|
||||
pub(crate) fn clock_time_get(
|
||||
memory: &mut [u8],
|
||||
clock_id: wasi::__wasi_clockid_t,
|
||||
precision: wasi::__wasi_timestamp_t,
|
||||
time_ptr: wasi32::uintptr_t,
|
||||
) -> Result<()> {
|
||||
trace!(
|
||||
"clock_time_get(clock_id={:?}, precision={:?}, time_ptr={:#x?})",
|
||||
clock_id,
|
||||
precision,
|
||||
time_ptr,
|
||||
);
|
||||
|
||||
let time = hostcalls_impl::clock_time_get(clock_id)?;
|
||||
|
||||
trace!(" | *time_ptr={:?}", time);
|
||||
|
||||
enc_timestamp_byref(memory, time_ptr, time)
|
||||
}
|
||||
|
||||
pub(crate) fn sched_yield() -> Result<()> {
|
||||
trace!("sched_yield()");
|
||||
|
||||
std::thread::yield_now();
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub(crate) fn poll_oneoff(
|
||||
wasi_ctx: &WasiCtx,
|
||||
memory: &mut [u8],
|
||||
input: wasi32::uintptr_t,
|
||||
output: wasi32::uintptr_t,
|
||||
nsubscriptions: wasi32::size_t,
|
||||
nevents: wasi32::uintptr_t,
|
||||
) -> Result<()> {
|
||||
trace!(
|
||||
"poll_oneoff(input={:#x?}, output={:#x?}, nsubscriptions={}, nevents={:#x?})",
|
||||
input,
|
||||
output,
|
||||
nsubscriptions,
|
||||
nevents,
|
||||
);
|
||||
|
||||
if u64::from(nsubscriptions) > wasi::__wasi_filesize_t::max_value() {
|
||||
return Err(Error::EINVAL);
|
||||
}
|
||||
|
||||
enc_int_byref(memory, nevents, 0)?;
|
||||
|
||||
let subscriptions = dec_subscriptions(memory, input, nsubscriptions)?;
|
||||
let mut events = Vec::new();
|
||||
|
||||
let mut timeout: Option<ClockEventData> = None;
|
||||
let mut fd_events = Vec::new();
|
||||
for subscription in subscriptions {
|
||||
match subscription.r#type {
|
||||
wasi::__WASI_EVENTTYPE_CLOCK => {
|
||||
let clock = unsafe { subscription.u.clock };
|
||||
let delay = wasi_clock_to_relative_ns_delay(clock)?;
|
||||
|
||||
log::debug!("poll_oneoff event.u.clock = {:?}", clock);
|
||||
log::debug!("poll_oneoff delay = {:?}ns", delay);
|
||||
|
||||
let current = ClockEventData {
|
||||
delay,
|
||||
userdata: subscription.userdata,
|
||||
};
|
||||
let timeout = timeout.get_or_insert(current);
|
||||
if current.delay < timeout.delay {
|
||||
*timeout = current;
|
||||
}
|
||||
}
|
||||
r#type
|
||||
if r#type == wasi::__WASI_EVENTTYPE_FD_READ
|
||||
|| r#type == wasi::__WASI_EVENTTYPE_FD_WRITE =>
|
||||
{
|
||||
let wasi_fd = unsafe { subscription.u.fd_readwrite.file_descriptor };
|
||||
let rights = if r#type == wasi::__WASI_EVENTTYPE_FD_READ {
|
||||
wasi::__WASI_RIGHT_FD_READ
|
||||
} else {
|
||||
wasi::__WASI_RIGHT_FD_WRITE
|
||||
};
|
||||
|
||||
match unsafe {
|
||||
wasi_ctx
|
||||
.get_fd_entry(wasi_fd)
|
||||
.and_then(|fe| fe.as_descriptor(rights, 0))
|
||||
} {
|
||||
Ok(descriptor) => fd_events.push(FdEventData {
|
||||
descriptor,
|
||||
r#type: subscription.r#type,
|
||||
userdata: subscription.userdata,
|
||||
}),
|
||||
Err(err) => {
|
||||
let event = wasi::__wasi_event_t {
|
||||
userdata: subscription.userdata,
|
||||
r#type,
|
||||
error: err.as_wasi_errno(),
|
||||
u: wasi::__wasi_event_u {
|
||||
fd_readwrite: wasi::__wasi_event_fd_readwrite_t {
|
||||
nbytes: 0,
|
||||
flags: 0,
|
||||
},
|
||||
},
|
||||
};
|
||||
events.push(event);
|
||||
}
|
||||
};
|
||||
}
|
||||
_ => unreachable!(),
|
||||
}
|
||||
}
|
||||
|
||||
log::debug!("poll_oneoff timeout = {:?}", timeout);
|
||||
log::debug!("poll_oneoff fd_events = {:?}", fd_events);
|
||||
|
||||
hostcalls_impl::poll_oneoff(timeout, fd_events, &mut events)?;
|
||||
|
||||
let events_count = u32::try_from(events.len()).map_err(|_| Error::EOVERFLOW)?;
|
||||
|
||||
enc_events(memory, output, nsubscriptions, events)?;
|
||||
|
||||
trace!(" | *nevents={:?}", events_count);
|
||||
|
||||
enc_int_byref(memory, nevents, events_count)
|
||||
}
|
||||
|
||||
fn wasi_clock_to_relative_ns_delay(wasi_clock: wasi::__wasi_subscription_clock_t) -> Result<u128> {
|
||||
use std::time::SystemTime;
|
||||
|
||||
if wasi_clock.flags != wasi::__WASI_SUBSCRIPTION_CLOCK_ABSTIME {
|
||||
return Ok(u128::from(wasi_clock.timeout));
|
||||
}
|
||||
let now: u128 = SystemTime::now()
|
||||
.duration_since(SystemTime::UNIX_EPOCH)
|
||||
.map_err(|_| Error::ENOTCAPABLE)?
|
||||
.as_nanos();
|
||||
let deadline = u128::from(wasi_clock.timeout);
|
||||
Ok(deadline.saturating_sub(now))
|
||||
}
|
||||
|
||||
#[derive(Debug, Copy, Clone)]
|
||||
pub(crate) struct ClockEventData {
|
||||
pub(crate) delay: u128, // delay is expressed in nanoseconds
|
||||
pub(crate) userdata: wasi::__wasi_userdata_t,
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub(crate) struct FdEventData<'a> {
|
||||
pub(crate) descriptor: &'a Descriptor,
|
||||
pub(crate) r#type: wasi::__wasi_eventtype_t,
|
||||
pub(crate) userdata: wasi::__wasi_userdata_t,
|
||||
}
|
||||
Reference in New Issue
Block a user