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Rewrite majority of impl reusing libstd (#34)

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* Rewrite FdEntry reusing as much libstd as possible

* Use the new FdEntry, FdObject, Descriptor struct in *nix impl

* Adapt Windows impl

* Remove unnecessary check in fd_read

Check `host_nread == 0` caused premature FdEntry closure and removal
which ultimately was resulting in an attempt at "double closing" of
the same file descriptor at the end of the Wasm program:
...
fd_close(fd=4)
    -> errno=WASI_ESUCCESS
fd_close(fd=4)
    -> errno=WASI_EBADF

* Use libstd vectored IO

* Use std:🧵:yield_now to implement sched_yield

* Add logging to integration tests

* Add preliminary support for host-specific errors

* Operate on std::fs::File in path_get on *nix

* Add cross-platform RawString type encapsulating OsStrExt

* Fix Windows build

* Update Travis and README to Rust v1.36

* Remove unused winx::handle::close helper

* Refactor Descriptor into raw handles/fds

* Strip readlinkat in prep for path_get host-independent

* Strip openat in prep for path_get host-independent

* Move ManuallyDrop up one level from Descriptor to FdObject

* Make (c)iovec host fns unsafe

* Swap unwraps/expects for Results in fdentry_impl on nix

* Rewrite fd_pread/write and implement for Win

* Use File::sync_all to impl fd_sync

* Use File::sync_data to impl fd_datasync

* Rewind file cursor after fd_p{read, write} on Windows

* Add fd_p{read, write} tests

* Handle errors instead of panicking in path_get

* Use File::set_len to impl fd_allocate

* Add test for fd_allocate

* Replace all panics with Results

* Document the point of RawString
This commit is contained in:
Jakub Konka
2019-07-16 00:34:28 +02:00
committed by Dan Gohman
parent 93e1657bae
commit 667f272edd
32 changed files with 977 additions and 1045 deletions
Download Patch File Download Diff File Expand all files Collapse all files

130
src/sys/unix/fdentry_impl.rs Normal file
View File

@@ -0,0 +1,130 @@
use crate::fdentry::Descriptor;
use crate::host;
use crate::sys::errno_from_host;
use std::io;
use std::os::unix::prelude::{AsRawFd, FileTypeExt, FromRawFd, RawFd};
impl AsRawFd for Descriptor {
fn as_raw_fd(&self) -> RawFd {
match self {
Descriptor::File(f) => f.as_raw_fd(),
Descriptor::Stdin => io::stdin().as_raw_fd(),
Descriptor::Stdout => io::stdout().as_raw_fd(),
Descriptor::Stderr => io::stderr().as_raw_fd(),
}
}
}
pub(crate) fn determine_type_and_access_rights<Fd: AsRawFd>(
fd: &Fd,
) -> Result<
(
host::__wasi_filetype_t,
host::__wasi_rights_t,
host::__wasi_rights_t,
),
host::__wasi_errno_t,
> {
let (file_type, mut rights_base, rights_inheriting) = determine_type_rights(fd)?;
use nix::fcntl::{fcntl, OFlag, F_GETFL};
let flags_bits = fcntl(fd.as_raw_fd(), F_GETFL).map_err(|err| {
err.as_errno()
.map_or(host::__WASI_EIO, |e| errno_from_host(e as i32))
})?;
let flags = OFlag::from_bits_truncate(flags_bits);
let accmode = flags & OFlag::O_ACCMODE;
if accmode == OFlag::O_RDONLY {
rights_base &= !host::__WASI_RIGHT_FD_WRITE;
} else if accmode == OFlag::O_WRONLY {
rights_base &= !host::__WASI_RIGHT_FD_READ;
}
Ok((file_type, rights_base, rights_inheriting))
}
pub(crate) fn determine_type_rights<Fd: AsRawFd>(
fd: &Fd,
) -> Result<
(
host::__wasi_filetype_t,
host::__wasi_rights_t,
host::__wasi_rights_t,
),
host::__wasi_errno_t,
> {
let (file_type, rights_base, rights_inheriting) = {
// we just make a `File` here for convenience; we don't want it to close when it drops
let file =
std::mem::ManuallyDrop::new(unsafe { std::fs::File::from_raw_fd(fd.as_raw_fd()) });
let ft = file
.metadata()
.map_err(|err| err.raw_os_error().map_or(host::__WASI_EIO, errno_from_host))?
.file_type();
if ft.is_block_device() {
(
host::__WASI_FILETYPE_BLOCK_DEVICE,
host::RIGHTS_BLOCK_DEVICE_BASE,
host::RIGHTS_BLOCK_DEVICE_INHERITING,
)
} else if ft.is_char_device() {
if nix::unistd::isatty(fd.as_raw_fd()).map_err(|err| {
err.as_errno()
.map_or(host::__WASI_EIO, |e| errno_from_host(e as i32))
})? {
(
host::__WASI_FILETYPE_CHARACTER_DEVICE,
host::RIGHTS_TTY_BASE,
host::RIGHTS_TTY_BASE,
)
} else {
(
host::__WASI_FILETYPE_CHARACTER_DEVICE,
host::RIGHTS_CHARACTER_DEVICE_BASE,
host::RIGHTS_CHARACTER_DEVICE_INHERITING,
)
}
} else if ft.is_dir() {
(
host::__WASI_FILETYPE_DIRECTORY,
host::RIGHTS_DIRECTORY_BASE,
host::RIGHTS_DIRECTORY_INHERITING,
)
} else if ft.is_file() {
(
host::__WASI_FILETYPE_REGULAR_FILE,
host::RIGHTS_REGULAR_FILE_BASE,
host::RIGHTS_REGULAR_FILE_INHERITING,
)
} else if ft.is_socket() {
use nix::sys::socket;
match socket::getsockopt(fd.as_raw_fd(), socket::sockopt::SockType).map_err(|err| {
err.as_errno()
.map_or(host::__WASI_EIO, |e| errno_from_host(e as i32))
})? {
socket::SockType::Datagram => (
host::__WASI_FILETYPE_SOCKET_DGRAM,
host::RIGHTS_SOCKET_BASE,
host::RIGHTS_SOCKET_INHERITING,
),
socket::SockType::Stream => (
host::__WASI_FILETYPE_SOCKET_STREAM,
host::RIGHTS_SOCKET_BASE,
host::RIGHTS_SOCKET_INHERITING,
),
_ => return Err(host::__WASI_EINVAL),
}
} else if ft.is_fifo() {
(
host::__WASI_FILETYPE_SOCKET_STREAM,
host::RIGHTS_SOCKET_BASE,
host::RIGHTS_SOCKET_INHERITING,
)
} else {
return Err(host::__WASI_EINVAL);
}
};
Ok((file_type, rights_base, rights_inheriting))
}