std: move process implementations to `sys`

As per #117276, this moves the implementations of `Process` and friends out of the `pal` module and into the `sys` module, removing quite a lot of error-prone `#[path]` imports in the process (hah, get it ;-)). I've also made the `zircon` module a dedicated submodule of `pal::unix`, hopefully we can move some other definitions there as well (they are currently quite a lot of duplications in `sys`). Also, the `ensure_no_nuls` function on Windows now lives in `sys::pal::windows` – it's not specific to processes and shared by the argument implementation.

1 files changed, 19 insertions, 0 deletions

diff --git a/library/std/src/sys/process/mod.rs b/library/std/src/sys/process/mod.rs
new file mode 100644
index 00000000000..92cfac7f47c
--- /dev/null
+++ b/library/std/src/sys/process/mod.rs
@@ -0,0 +1,19 @@
+cfg_if::cfg_if! {
+    if #[cfg(target_family = "unix")] {
+        mod unix;
+        use unix as imp;
+    } else if #[cfg(target_os = "windows")] {
+        mod windows;
+        use windows as imp;
+    } else if #[cfg(target_os = "uefi")] {
+        mod uefi;
+        use uefi as imp;
+    } else {
+        mod unsupported;
+        use unsupported as imp;
+    }
+}
+
+pub use imp::{
+    Command, CommandArgs, EnvKey, ExitCode, ExitStatus, ExitStatusError, Process, Stdio, StdioPipes,
+};