move OS constants to platform crate

Author: stlankes

Cargo.lock

@@ -1372,9 +1372,9 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.1"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f22b8f315b98f415780ddbe9163c7dbbc5a07225b6d102ace1d8aeef85775140"
+checksum = "0ebe6e23502442c4c9cd80fcb8bdf867dc5f4a9e9f1d882499fa49c5ed83e559"
 dependencies = [
  "compiler_builtins",
  "libc",

src/libstd/Cargo.toml

@@ -41,7 +41,7 @@ dlmalloc = { version = "0.1", features = ['rustc-dep-of-std'] }
 fortanix-sgx-abi = { version = "0.3.2", features = ['rustc-dep-of-std'] }
 
 [target.'cfg(all(any(target_arch = "x86_64", target_arch = "aarch64"), target_os = "hermit"))'.dependencies]
-hermit-abi = { version = "0.1", features = ['rustc-dep-of-std'] }
+hermit-abi = { version = "0.1.9", features = ['rustc-dep-of-std'] }
 
 [target.wasm32-wasi.dependencies]
 wasi = { version = "0.9.0", features = ['rustc-dep-of-std'], default-features = false }

src/libstd/sys/hermit/fs.rs

@@ -6,6 +6,8 @@ use crate::io::{IoSlice, IoSliceMut, SeekFrom};
 use crate::path::{Path, PathBuf};
 use crate::sys::cvt;
 use crate::sys::hermit::abi;
+use crate::sys::hermit::abi::{O_RDONLY, O_WRONLY, O_RDWR,O_CREAT,
+    O_EXCL, O_TRUNC, O_APPEND};
 use crate::sys::hermit::fd::FileDesc;
 use crate::sys::time::SystemTime;
 use crate::sys::{unsupported, Void};
@@ -17,14 +19,6 @@ pub use crate::sys_common::fs::copy;
 fn cstr(path: &Path) -> io::Result<CString> {
     Ok(CString::new(path.as_os_str().as_bytes())?)
 }
-//const O_ACCMODE: i32 = 00000003;
-const O_RDONLY: i32 = 00000000;
-const O_WRONLY: i32 = 00000001;
-const O_RDWR: i32 = 00000002;
-const O_CREAT: i32 = 00000100;
-const O_EXCL: i32 = 00000200;
-const O_TRUNC: i32 = 00001000;
-const O_APPEND: i32 = 00002000;
 
 #[derive(Debug)]
 pub struct File(FileDesc);