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Port wasi-common from unsafe-io to io-lifetimes (#3049)

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* Port wasi-common to io-lifetimes.

This ports wasi-common from unsafe-io to io-lifetimes.

Ambient authority is now indicated via calls to `ambient_authority()`
from the ambient-authority crate, rather than using `unsafe` blocks.

The `GetSetFdFlags::set_fd_flags` function is now split into two phases,
to simplify lifetimes in implementations which need to close and re-open
the underlying file.

* Use posish for errno values instead of libc.

This eliminates one of the few remaining direct libc dependencies.

* Port to posish::io::poll.

Use posish::io::poll instead of calling libc directly. This factors out
more code from Wasmtime, and eliminates the need to manipulate raw file
descriptors directly.

And, this eliminates the last remaining direct dependency on libc in
wasi-common.

* Port wasi-c-api to io-lifetimes.

* Update to posish 0.16.0.

* Embeded NULs in filenames now get `EINVAL` instead of `EILSEQ`.

* Accept either `EILSEQ` or `EINVAL` for embedded NULs.

* Bump the nightly toolchain to 2021-07-12.

This fixes build errors on the semver crate, which as of this writing
builds with latest nightly and stable but not 2021-04-11, the old pinned
version.

* Have cap-std-sync re-export ambient_authority so that users get the same version.
This commit is contained in:
Dan Gohman
2021-07-14 15:39:09 -07:00
committed by GitHub
parent 13d317a0a8
commit 6a5a295019
26 changed files with 299 additions and 333 deletions
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8
crates/wasi-common/cap-std-sync/src/dir.rs
View File

@@ -74,7 +74,8 @@ impl Dir {
let mut f = self.0.open_with(Path::new(path), &opts)?;
// NONBLOCK does not have an OpenOption either, but we can patch that on with set_fd_flags:
if fdflags.contains(wasi_common::file::FdFlags::NONBLOCK) {
f.set_fd_flags(system_interface::fs::FdFlags::NONBLOCK)?;
let set_fd_flags = f.new_set_fd_flags(system_interface::fs::FdFlags::NONBLOCK)?;
f.set_fd_flags(set_fd_flags)?;
}
Ok(File::from_cap_std(f))
}
@@ -311,13 +312,14 @@ fn convert_systimespec(t: Option<wasi_common::SystemTimeSpec>) -> Option<SystemT
#[cfg(test)]
mod test {
use super::Dir;
use cap_std::ambient_authority;
#[test]
fn scratch_dir() {
let tempdir = tempfile::Builder::new()
.prefix("cap-std-sync")
.tempdir()
.expect("create temporary dir");
let preopen_dir = unsafe { cap_std::fs::Dir::open_ambient_dir(tempdir.path()) }
let preopen_dir = cap_std::fs::Dir::open_ambient_dir(tempdir.path(), ambient_authority())
.expect("open ambient temporary dir");
let preopen_dir = Dir::from_cap_std(preopen_dir);
run(wasi_common::WasiDir::open_dir(&preopen_dir, false, "."))
@@ -347,7 +349,7 @@ mod test {
.prefix("cap-std-sync")
.tempdir()
.expect("create temporary dir");
let preopen_dir = unsafe { cap_std::fs::Dir::open_ambient_dir(tempdir.path()) }
let preopen_dir = cap_std::fs::Dir::open_ambient_dir(tempdir.path(), ambient_authority())
.expect("open ambient temporary dir");
let preopen_dir = Dir::from_cap_std(preopen_dir);