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Move the is_file_read_write implementation out of rustix. #228

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Move the is_file_read_write implementation out of rustix. #228

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24 changes: 22 additions & 2 deletions cap-primitives/src/rustix/fs/is_file_read_write_impl.rs
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Original file line number Diff line number Diff line change
@@ -1,7 +1,27 @@
use rustix::fs::is_file_read_write;
use rustix::fs::OFlags;
use std::{fs, io};

#[inline]
pub(crate) fn is_file_read_write_impl(file: &fs::File) -> io::Result<(bool, bool)> {
Ok(is_file_read_write(file)?)
let mode = rustix::fs::fcntl_getfl(file)?;

// Check for `O_PATH`.
#[cfg(any(
target_os = "android",
target_os = "fuchsia",
target_os = "linux",
target_os = "emscripten"
))]
if mode.contains(OFlags::PATH) {
return Ok((false, false));
}

// Use `RWMODE` rather than `ACCMODE` as `ACCMODE` may include `O_PATH`.
// We handled `O_PATH` above.
match mode & OFlags::RWMODE {
OFlags::RDONLY => Ok((true, false)),
OFlags::RDWR => Ok((true, true)),
OFlags::WRONLY => Ok((false, true)),
_ => unreachable!(),
}
}