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.

Author: joboet

library/std/src/sys/mod.rs

@@ -17,6 +17,7 @@ pub mod io;
 pub mod net;
 pub mod os_str;
 pub mod path;
+pub mod process;
 pub mod random;
 pub mod stdio;
 pub mod sync;

library/std/src/sys/pal/hermit/mod.rs

@@ -25,8 +25,6 @@ pub mod futex;
 pub mod os;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;
-#[path = "../unsupported/process.rs"]
-pub mod process;
 pub mod thread;
 pub mod time;
 

library/std/src/sys/pal/sgx/mod.rs

@@ -16,8 +16,6 @@ mod libunwind_integration;
 pub mod os;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;
-#[path = "../unsupported/process.rs"]
-pub mod process;
 pub mod thread;
 pub mod thread_parking;
 pub mod time;

library/std/src/sys/pal/solid/mod.rs

@@ -25,8 +25,6 @@ pub(crate) mod error;
 pub mod os;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;
-#[path = "../unsupported/process.rs"]
-pub mod process;
 pub use self::itron::{thread, thread_parking};
 pub mod time;
 

library/std/src/sys/pal/teeos/mod.rs

@@ -14,8 +14,6 @@ pub mod env;
 pub mod os;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;
-#[path = "../unsupported/process.rs"]
-pub mod process;
 pub mod thread;
 #[allow(non_upper_case_globals)]
 #[path = "../unix/time.rs"]

library/std/src/sys/pal/uefi/mod.rs

@@ -19,7 +19,6 @@ pub mod helpers;
 pub mod os;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;
-pub mod process;
 pub mod thread;
 pub mod time;
 

library/std/src/sys/pal/unix/process/zircon.rs renamed to library/std/src/sys/pal/unix/fuchsia.rs

@@ -9,14 +9,15 @@ pub mod weak;
 pub mod args;
 pub mod env;
 pub mod fd;
+#[cfg(target_os = "fuchsia")]
+pub mod fuchsia;
 pub mod futex;
 #[cfg(any(target_os = "linux", target_os = "android"))]
 pub mod kernel_copy;
 #[cfg(target_os = "linux")]
 pub mod linux;
 pub mod os;
 pub mod pipe;
-pub mod process;
 pub mod stack_overflow;
 pub mod sync;
 pub mod thread;
@@ -419,7 +420,7 @@ cfg_if::cfg_if! {
 }
 
 #[cfg(any(target_os = "espidf", target_os = "horizon", target_os = "vita", target_os = "nuttx"))]
-mod unsupported {
+pub mod unsupported {
     use crate::io;
 
     pub fn unsupported<T>() -> io::Result<T> {

library/std/src/sys/pal/unix/mod.rs

@@ -4,7 +4,6 @@ pub mod args;
 pub mod env;
 pub mod os;
 pub mod pipe;
-pub mod process;
 pub mod thread;
 pub mod time;