Rollup merge of #135696 - joboet:move_pal_io, r=Noratrieb

std: move `io` module out of `pal`, get rid of `sys_common::io`

Part of #117276.

This does two related things:
1. It moves the platform-specific definitions for `IoSlice`, `IoSliceMut` and `is_terminal` out of `pal` and into `sys` and unifies some of them.
2. It gets rid of `sys_common::io`, moving the non-platform-specific test helpers into `std::test_helpers` and the buffer size definition to the new `sys::io` module.

1 files changed, 44 insertions, 0 deletions

diff --git a/library/std/src/sys/io/mod.rs b/library/std/src/sys/io/mod.rs
new file mode 100644
index 00000000000..e00b479109f
--- /dev/null
+++ b/library/std/src/sys/io/mod.rs
@@ -0,0 +1,44 @@
+#![forbid(unsafe_op_in_unsafe_fn)]
+
+mod io_slice {
+    cfg_if::cfg_if! {
+        if #[cfg(any(target_family = "unix", target_os = "hermit", target_os = "solid_asp3"))] {
+            mod iovec;
+            pub use iovec::*;
+        } else if #[cfg(target_os = "windows")] {
+            mod windows;
+            pub use windows::*;
+        } else if #[cfg(target_os = "wasi")] {
+            mod wasi;
+            pub use wasi::*;
+        } else {
+            mod unsupported;
+            pub use unsupported::*;
+        }
+    }
+}
+
+mod is_terminal {
+    cfg_if::cfg_if! {
+        if #[cfg(any(target_family = "unix", target_os = "wasi"))] {
+            mod isatty;
+            pub use isatty::*;
+        } else if #[cfg(target_os = "windows")] {
+            mod windows;
+            pub use windows::*;
+        } else if #[cfg(target_os = "hermit")] {
+            mod hermit;
+            pub use hermit::*;
+        } else {
+            mod unsupported;
+            pub use unsupported::*;
+        }
+    }
+}
+
+pub use io_slice::{IoSlice, IoSliceMut};
+pub use is_terminal::is_terminal;
+
+// Bare metal platforms usually have very small amounts of RAM
+// (in the order of hundreds of KB)
+pub const DEFAULT_BUF_SIZE: usize = if cfg!(target_os = "espidf") { 512 } else { 8 * 1024 };