982b022b1e
std/sys/fd: Relax `READ_LIMIT` on Darwin
Darwin's `read`/`write` syscalls emit `EINVAL` only when `nbyte > INT_MAX`. The case `nbyte == INT_MAX` is valid, so the subtraction (`- 1`) in
```rust
const READ_LIMIT: usize = if cfg!(target_vendor = "apple") {
libc::c_int::MAX as usize - 1 // <- HERE
} else {
libc::ssize_t::MAX as usize
};
```
can be removed.
I tested that the case `nbyte == INT_MAX` is valid on various versions of macOS, including old one like Mac OS X 10.5.
The man page says:
- read() and pread() will fail if the parameter nbyte exceeds INT_MAX (link: https://keith.github.io/xcode-man-pages/read.2.html)
- write() and pwrite() will fail if the parameter nbyte exceeds INT_MAX (link: https://keith.github.io/xcode-man-pages/write.2.html)
Here are links to Darwin's code:
- [macOS 15.5] e3723e1f17/bsd/kern/sys_generic.c (L307)
- [Mac OS X 10.2] d738f90084/bsd/kern/sys_generic.c (L220)
Related PR: rust-lang/rust#38622.
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