1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463
use std::task::Waker;
use super::*;
#[cfg(feature = "journal")]
use crate::{
journal::{JournalEffector, JournalEntry},
utils::map_snapshot_err,
};
use crate::{net::socket::TimeType, syscalls::*};
/// ### `fd_write()`
/// Write data to the file descriptor
/// Inputs:
/// - `Fd`
/// File descriptor (opened with writing) to write to
/// - `const __wasi_ciovec_t *iovs`
/// List of vectors to read data from
/// - `u32 iovs_len`
/// Length of data in `iovs`
/// Output:
/// - `u32 *nwritten`
/// Number of bytes written
/// Errors:
///
#[instrument(level = "trace", skip_all, fields(%fd, nwritten = field::Empty), ret)]
pub fn fd_write<M: MemorySize>(
mut ctx: FunctionEnvMut<'_, WasiEnv>,
fd: WasiFd,
iovs: WasmPtr<__wasi_ciovec_t<M>, M>,
iovs_len: M::Offset,
nwritten: WasmPtr<M::Offset, M>,
) -> Result<Errno, WasiError> {
wasi_try_ok!(WasiEnv::process_signals_and_exit(&mut ctx)?);
let env = ctx.data();
let offset = {
let state = env.state.clone();
let inodes = state.inodes.clone();
let fd_entry = wasi_try_ok!(state.fs.get_fd(fd));
fd_entry.offset.load(Ordering::Acquire) as usize
};
let bytes_written = wasi_try_ok!(fd_write_internal::<M>(
&ctx,
fd,
FdWriteSource::Iovs { iovs, iovs_len },
offset as u64,
true,
env.enable_journal,
)?);
Span::current().record("nwritten", bytes_written);
let mut env = ctx.data();
let memory = unsafe { env.memory_view(&ctx) };
let nwritten_ref = nwritten.deref(&memory);
let bytes_written: M::Offset =
wasi_try_ok!(bytes_written.try_into().map_err(|_| Errno::Overflow));
wasi_try_mem_ok!(nwritten_ref.write(bytes_written));
Ok(Errno::Success)
}
/// ### `fd_pwrite()`
/// Write to a file without adjusting its offset
/// Inputs:
/// - `Fd`
/// File descriptor (opened with writing) to write to
/// - `const __wasi_ciovec_t *iovs`
/// List of vectors to read data from
/// - `u32 iovs_len`
/// Length of data in `iovs`
/// - `Filesize offset`
/// The offset to write at
/// Output:
/// - `u32 *nwritten`
/// Number of bytes written
#[instrument(level = "trace", skip_all, fields(%fd, %offset, nwritten = field::Empty), ret)]
pub fn fd_pwrite<M: MemorySize>(
mut ctx: FunctionEnvMut<'_, WasiEnv>,
fd: WasiFd,
iovs: WasmPtr<__wasi_ciovec_t<M>, M>,
iovs_len: M::Offset,
offset: Filesize,
nwritten: WasmPtr<M::Offset, M>,
) -> Result<Errno, WasiError> {
wasi_try_ok!(WasiEnv::process_signals_and_exit(&mut ctx)?);
let enable_snapshot_capture = ctx.data().enable_journal;
let bytes_written = wasi_try_ok!(fd_write_internal::<M>(
&ctx,
fd,
FdWriteSource::Iovs { iovs, iovs_len },
offset,
false,
enable_snapshot_capture,
)?);
Span::current().record("nwritten", bytes_written);
let mut env = ctx.data();
let memory = unsafe { env.memory_view(&ctx) };
let nwritten_ref = nwritten.deref(&memory);
let bytes_written: M::Offset =
wasi_try_ok!(bytes_written.try_into().map_err(|_| Errno::Overflow));
wasi_try_mem_ok!(nwritten_ref.write(bytes_written));
Ok(Errno::Success)
}
pub(crate) enum FdWriteSource<'a, M: MemorySize> {
Iovs {
iovs: WasmPtr<__wasi_ciovec_t<M>, M>,
iovs_len: M::Offset,
},
Buffer(Cow<'a, [u8]>),
}
#[allow(clippy::await_holding_lock)]
pub(crate) fn fd_write_internal<M: MemorySize>(
ctx: &FunctionEnvMut<'_, WasiEnv>,
fd: WasiFd,
data: FdWriteSource<'_, M>,
offset: u64,
should_update_cursor: bool,
should_snapshot: bool,
) -> Result<Result<usize, Errno>, WasiError> {
let mut offset = offset;
let mut env = ctx.data();
let state = env.state.clone();
let fd_entry = wasi_try_ok_ok!(state.fs.get_fd(fd));
let is_stdio = fd_entry.is_stdio;
let bytes_written = {
if !is_stdio && !fd_entry.rights.contains(Rights::FD_WRITE) {
return Ok(Err(Errno::Access));
}
let fd_flags = fd_entry.flags;
let mut memory = unsafe { env.memory_view(&ctx) };
let (bytes_written, is_file, can_snapshot) = {
let (mut memory, _) = unsafe { env.get_memory_and_wasi_state(&ctx, 0) };
let mut guard = fd_entry.inode.write();
match guard.deref_mut() {
Kind::File { handle, .. } => {
if let Some(handle) = handle {
let handle = handle.clone();
drop(guard);
let res = __asyncify_light(
env,
if fd_entry.flags.contains(Fdflags::NONBLOCK) {
Some(Duration::ZERO)
} else {
None
},
async {
let mut handle = handle.write().unwrap();
if !is_stdio {
if fd_entry.flags.contains(Fdflags::APPEND) {
// `fdflags::append` means we need to seek to the end before writing.
offset = fd_entry.inode.stat.read().unwrap().st_size;
fd_entry.offset.store(offset, Ordering::Release);
}
handle
.seek(std::io::SeekFrom::Start(offset))
.await
.map_err(map_io_err)?;
}
let mut written = 0usize;
match &data {
FdWriteSource::Iovs { iovs, iovs_len } => {
let iovs_arr = iovs
.slice(&memory, *iovs_len)
.map_err(mem_error_to_wasi)?;
let iovs_arr =
iovs_arr.access().map_err(mem_error_to_wasi)?;
for iovs in iovs_arr.iter() {
let buf = WasmPtr::<u8, M>::new(iovs.buf)
.slice(&memory, iovs.buf_len)
.map_err(mem_error_to_wasi)?
.access()
.map_err(mem_error_to_wasi)?;
let local_written =
match handle.write(buf.as_ref()).await {
Ok(s) => s,
Err(_) if written > 0 => break,
Err(err) => return Err(map_io_err(err)),
};
written += local_written;
if local_written != buf.len() {
break;
}
}
}
FdWriteSource::Buffer(data) => {
handle.write_all(data).await?;
written += data.len();
}
}
if is_stdio {
handle.flush().await.map_err(map_io_err)?;
}
Ok(written)
},
);
let written = wasi_try_ok_ok!(res?.map_err(|err| match err {
Errno::Timedout => Errno::Again,
a => a,
}));
(written, true, true)
} else {
return Ok(Err(Errno::Inval));
}
}
Kind::Socket { socket } => {
let socket = socket.clone();
drop(guard);
let nonblocking = fd_flags.contains(Fdflags::NONBLOCK);
let timeout = socket
.opt_time(TimeType::WriteTimeout)
.ok()
.flatten()
.unwrap_or(Duration::from_secs(30));
let tasks = env.tasks().clone();
let res = __asyncify_light(env, None, async {
let mut sent = 0usize;
match &data {
FdWriteSource::Iovs { iovs, iovs_len } => {
let iovs_arr =
iovs.slice(&memory, *iovs_len).map_err(mem_error_to_wasi)?;
let iovs_arr = iovs_arr.access().map_err(mem_error_to_wasi)?;
for iovs in iovs_arr.iter() {
let buf = WasmPtr::<u8, M>::new(iovs.buf)
.slice(&memory, iovs.buf_len)
.map_err(mem_error_to_wasi)?
.access()
.map_err(mem_error_to_wasi)?;
let local_sent = socket
.send(
tasks.deref(),
buf.as_ref(),
Some(timeout),
nonblocking,
)
.await?;
sent += local_sent;
if local_sent != buf.len() {
break;
}
}
}
FdWriteSource::Buffer(data) => {
sent += socket
.send(tasks.deref(), data.as_ref(), Some(timeout), nonblocking)
.await?;
}
}
Ok(sent)
});
let written = wasi_try_ok_ok!(res?);
(written, false, false)
}
Kind::Pipe { pipe } => {
let mut written = 0usize;
match &data {
FdWriteSource::Iovs { iovs, iovs_len } => {
let iovs_arr = wasi_try_ok_ok!(iovs
.slice(&memory, *iovs_len)
.map_err(mem_error_to_wasi));
let iovs_arr =
wasi_try_ok_ok!(iovs_arr.access().map_err(mem_error_to_wasi));
for iovs in iovs_arr.iter() {
let buf = wasi_try_ok_ok!(WasmPtr::<u8, M>::new(iovs.buf)
.slice(&memory, iovs.buf_len)
.map_err(mem_error_to_wasi));
let buf = wasi_try_ok_ok!(buf.access().map_err(mem_error_to_wasi));
let local_written =
wasi_try_ok_ok!(std::io::Write::write(pipe, buf.as_ref())
.map_err(map_io_err));
written += local_written;
if local_written != buf.len() {
break;
}
}
}
FdWriteSource::Buffer(data) => {
wasi_try_ok_ok!(
std::io::Write::write_all(pipe, data).map_err(map_io_err)
);
written += data.len();
}
}
(written, false, true)
}
Kind::Dir { .. } | Kind::Root { .. } => {
// TODO: verify
return Ok(Err(Errno::Isdir));
}
Kind::EventNotifications { inner } => {
let mut written = 0usize;
match &data {
FdWriteSource::Iovs { iovs, iovs_len } => {
let iovs_arr = wasi_try_ok_ok!(iovs
.slice(&memory, *iovs_len)
.map_err(mem_error_to_wasi));
let iovs_arr =
wasi_try_ok_ok!(iovs_arr.access().map_err(mem_error_to_wasi));
for iovs in iovs_arr.iter() {
let buf_len: usize = wasi_try_ok_ok!(iovs
.buf_len
.try_into()
.map_err(|_| Errno::Inval));
let will_be_written = buf_len;
let val_cnt = buf_len / std::mem::size_of::<u64>();
let val_cnt: M::Offset =
wasi_try_ok_ok!(val_cnt.try_into().map_err(|_| Errno::Inval));
let vals = wasi_try_ok_ok!(WasmPtr::<u64, M>::new(iovs.buf)
.slice(&memory, val_cnt as M::Offset)
.map_err(mem_error_to_wasi));
let vals =
wasi_try_ok_ok!(vals.access().map_err(mem_error_to_wasi));
for val in vals.iter() {
inner.write(*val);
}
written += will_be_written;
}
}
FdWriteSource::Buffer(data) => {
let cnt = data.len() / std::mem::size_of::<u64>();
for n in 0..cnt {
let start = n * std::mem::size_of::<u64>();
let data = [
data[start],
data[start + 1],
data[start + 2],
data[start + 3],
data[start + 4],
data[start + 5],
data[start + 6],
data[start + 7],
];
inner.write(u64::from_ne_bytes(data));
}
}
}
(written, false, true)
}
Kind::Symlink { .. } | Kind::Epoll { .. } => return Ok(Err(Errno::Inval)),
Kind::Buffer { buffer } => {
let mut written = 0usize;
match &data {
FdWriteSource::Iovs { iovs, iovs_len } => {
let iovs_arr = wasi_try_ok_ok!(iovs
.slice(&memory, *iovs_len)
.map_err(mem_error_to_wasi));
let iovs_arr =
wasi_try_ok_ok!(iovs_arr.access().map_err(mem_error_to_wasi));
for iovs in iovs_arr.iter() {
let buf = wasi_try_ok_ok!(WasmPtr::<u8, M>::new(iovs.buf)
.slice(&memory, iovs.buf_len)
.map_err(mem_error_to_wasi));
let buf = wasi_try_ok_ok!(buf.access().map_err(mem_error_to_wasi));
let local_written =
wasi_try_ok_ok!(std::io::Write::write(buffer, buf.as_ref())
.map_err(map_io_err));
written += local_written;
if local_written != buf.len() {
break;
}
}
}
FdWriteSource::Buffer(data) => {
wasi_try_ok_ok!(
std::io::Write::write_all(buffer, data).map_err(map_io_err)
);
written += data.len();
}
}
(written, false, true)
}
}
};
#[cfg(feature = "journal")]
if should_snapshot && can_snapshot && bytes_written > 0 {
if let FdWriteSource::Iovs { iovs, iovs_len } = data {
JournalEffector::save_fd_write(ctx, fd, offset, bytes_written, iovs, iovs_len)
.map_err(|err| {
tracing::error!("failed to save terminal data - {}", err);
WasiError::Exit(ExitCode::from(Errno::Fault))
})?;
}
}
env = ctx.data();
memory = unsafe { env.memory_view(&ctx) };
// reborrow and update the size
if !is_stdio {
let curr_offset = if is_file && should_update_cursor {
let bytes_written = bytes_written as u64;
let mut fd_map = state.fs.fd_map.write().unwrap();
let fd_entry = wasi_try_ok_ok!(fd_map.get_mut(fd).ok_or(Errno::Badf));
fd_entry
.offset
.fetch_add(bytes_written, Ordering::AcqRel)
// fetch_add returns the previous value, we have to add bytes_written again here
+ bytes_written
} else {
fd_entry.offset.load(Ordering::Acquire)
};
// we set the size but we don't return any errors if it fails as
// pipes and sockets will not do anything with this
let (mut memory, _, inodes) =
unsafe { env.get_memory_and_wasi_state_and_inodes(&ctx, 0) };
if is_file {
let mut stat = fd_entry.inode.stat.write().unwrap();
if should_update_cursor {
// If we wrote before the end, the current size is still correct.
// Otherwise, we only got as far as the current cursor. So, the
// max of the two is the correct new size.
stat.st_size = stat.st_size.max(curr_offset);
} else {
// pwrite does not update the cursor of the file so to calculate the final
// size of the file we compute where the cursor would have been if it was updated,
// and get the max value between it and the current size.
stat.st_size = stat.st_size.max(offset + bytes_written as u64);
}
} else {
// Cast is valid because we don't support 128 bit systems...
fd_entry.inode.stat.write().unwrap().st_size += bytes_written as u64;
}
}
bytes_written
};
Ok(Ok(bytes_written))
}