Auto merge of rust-lang#136929 - joboet:move_process_pal, r=Mark-Simulacrum

std: move process implementations to `sys`

As per rust-lang#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: bors

Diff for: 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;

Diff for: 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;
 

Diff for: 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;

Diff for: 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;
 

Diff for: 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"]

Diff for: 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;
 

Diff for: std/src/sys/pal/unix/process/zircon.rs renamed to 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> {

Diff for: 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;
 

Diff for: std/src/sys/pal/unix/process/mod.rs

@@ -23,8 +23,6 @@ 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;
 

Diff for: std/src/sys/pal/unsupported/mod.rs

@@ -20,8 +20,6 @@ pub mod futex;
 pub mod os;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;
-#[path = "../unsupported/process.rs"]
-pub mod process;
 #[path = "../wasi/thread.rs"]
 pub mod thread;
 #[path = "../wasi/time.rs"]

Diff for: std/src/sys/pal/wasi/mod.rs

@@ -23,8 +23,6 @@ pub mod env;
 pub mod os;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;
-#[path = "../unsupported/process.rs"]
-pub mod process;
 #[path = "../unsupported/time.rs"]
 pub mod time;
 

Diff for: std/src/sys/pal/wasip2/mod.rs

@@ -6,13 +6,13 @@
 #[cfg(test)]
 mod tests;
 
+use super::ensure_no_nuls;
 use super::os::current_exe;
 use crate::ffi::{OsStr, OsString};
 use crate::num::NonZero;
 use crate::os::windows::prelude::*;
 use crate::path::{Path, PathBuf};
 use crate::sys::path::get_long_path;
-use crate::sys::process::ensure_no_nuls;
 use crate::sys::{c, to_u16s};
 use crate::sys_common::AsInner;
 use crate::sys_common::wstr::WStrUnits;

Diff for: std/src/sys/pal/wasm/mod.rs

@@ -22,7 +22,6 @@ pub mod futex;
 pub mod handle;
 pub mod os;
 pub mod pipe;
-pub mod process;
 pub mod thread;
 pub mod time;
 cfg_if::cfg_if! {
@@ -287,6 +286,14 @@ pub fn truncate_utf16_at_nul(v: &[u16]) -> &[u16] {
     }
 }
 
+pub fn ensure_no_nuls<T: AsRef<OsStr>>(s: T) -> crate::io::Result<T> {
+    if s.as_ref().encode_wide().any(|b| b == 0) {
+        Err(crate::io::const_error!(ErrorKind::InvalidInput, "nul byte found in provided data"))
+    } else {
+        Ok(s)
+    }
+}
+
 pub trait IsZero {
     fn is_zero(&self) -> bool;
 }

Diff for: std/src/sys/pal/windows/args.rs

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

Diff for: std/src/sys/pal/windows/mod.rs

@@ -17,8 +17,6 @@ pub mod env;
 pub mod os;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;
-#[path = "../unsupported/process.rs"]
-pub mod process;
 #[path = "../unsupported/thread.rs"]
 pub mod thread;
 #[path = "../unsupported/time.rs"]

Diff for: std/src/sys/pal/xous/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,
+};

Diff for: std/src/sys/pal/zkvm/mod.rs

@@ -1,12 +1,13 @@
 use r_efi::protocols::simple_text_output;
 
-use super::helpers;
 use crate::collections::BTreeMap;
 pub use crate::ffi::OsString as EnvKey;
 use crate::ffi::{OsStr, OsString};
 use crate::num::{NonZero, NonZeroI32};
 use crate::path::Path;
 use crate::sys::fs::File;
+use crate::sys::pal::helpers;
+use crate::sys::pal::os::error_string;
 use crate::sys::pipe::AnonPipe;
 use crate::sys::unsupported;
 use crate::sys_common::process::{CommandEnv, CommandEnvs};
@@ -225,7 +226,7 @@ impl ExitStatus {
 
 impl fmt::Display for ExitStatus {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let err_str = super::os::error_string(self.0.as_usize());
+        let err_str = error_string(self.0.as_usize());
         write!(f, "{}", err_str)
     }
 }
@@ -241,7 +242,7 @@ pub struct ExitStatusError(r_efi::efi::Status);
 
 impl fmt::Debug for ExitStatusError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let err_str = super::os::error_string(self.0.as_usize());
+        let err_str = error_string(self.0.as_usize());
         write!(f, "{}", err_str)
     }
 }
@@ -335,15 +336,14 @@ impl<'a> fmt::Debug for CommandArgs<'a> {
 mod uefi_command_internal {
     use r_efi::protocols::{loaded_image, simple_text_output};
 
-    use super::super::helpers;
     use crate::ffi::{OsStr, OsString};
     use crate::io::{self, const_error};
     use crate::mem::MaybeUninit;
     use crate::os::uefi::env::{boot_services, image_handle, system_table};
     use crate::os::uefi::ffi::{OsStrExt, OsStringExt};
     use crate::ptr::NonNull;
     use crate::slice;
-    use crate::sys::pal::uefi::helpers::OwnedTable;
+    use crate::sys::pal::helpers::{self, OwnedTable};
     use crate::sys_common::wstr::WStrUnits;
 
     pub struct Image {

Diff for: std/src/sys/process/mod.rs

@@ -54,7 +54,7 @@ cfg_if::cfg_if! {
 
             let bit = (signum - 1) as usize;
             if set.is_null() || bit >= (8 * size_of::<sigset_t>()) {
-                crate::sys::pal::unix::os::set_errno(libc::EINVAL);
+                crate::sys::pal::os::set_errno(libc::EINVAL);
                 return -1;
             }
             let raw = slice::from_raw_parts_mut(

Diff for: std/src/sys/pal/uefi/process.rs renamed to std/src/sys/process/uefi.rs

@@ -1,8 +1,8 @@
 use libc::{c_int, size_t};
 
+use super::common::*;
 use crate::num::NonZero;
-use crate::sys::process::process_common::*;
-use crate::sys::process::zircon::{Handle, zx_handle_t};
+use crate::sys::pal::fuchsia::*;
 use crate::{fmt, io, mem, ptr};
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -58,8 +58,6 @@ impl Command {
         stdio: ChildPipes,
         maybe_envp: Option<&CStringArray>,
     ) -> io::Result<zx_handle_t> {
-        use crate::sys::process::zircon::*;
-
         let envp = match maybe_envp {
             // None means to clone the current environment, which is done in the
             // flags below.
@@ -152,8 +150,6 @@ impl Process {
     }
 
     pub fn kill(&mut self) -> io::Result<()> {
-        use crate::sys::process::zircon::*;
-
         unsafe {
             zx_cvt(zx_task_kill(self.handle.raw()))?;
         }
@@ -162,8 +158,6 @@ impl Process {
     }
 
     pub fn wait(&mut self) -> io::Result<ExitStatus> {
-        use crate::sys::process::zircon::*;
-
         let mut proc_info: zx_info_process_t = Default::default();
         let mut actual: size_t = 0;
         let mut avail: size_t = 0;
@@ -194,8 +188,6 @@ impl Process {
     }
 
     pub fn try_wait(&mut self) -> io::Result<Option<ExitStatus>> {
-        use crate::sys::process::zircon::*;
-
         let mut proc_info: zx_info_process_t = Default::default();
         let mut actual: size_t = 0;
         let mut avail: size_t = 0;
@@ -251,7 +243,7 @@ impl ExitStatus {
         None
     }
 
-    // FIXME: The actually-Unix implementation in process_unix.rs uses WSTOPSIG, WCOREDUMP et al.
+    // FIXME: The actually-Unix implementation in unix.rs uses WSTOPSIG, WCOREDUMP et al.
     // I infer from the implementation of `success`, `code` and `signal` above that these are not
     // available on Fuchsia.
     //

Diff for: std/src/sys/pal/unix/process/process_common.rs renamed to std/src/sys/process/unix/common.rs

@@ -0,0 +1,23 @@
+#[cfg_attr(any(target_os = "espidf", target_os = "horizon", target_os = "nuttx"), allow(unused))]
+mod common;
+
+cfg_if::cfg_if! {
+    if #[cfg(target_os = "fuchsia")] {
+        mod fuchsia;
+        use fuchsia as imp;
+    } else if #[cfg(target_os = "vxworks")] {
+        mod vxworks;
+        use vxworks as imp;
+    } else if #[cfg(any(target_os = "espidf", target_os = "horizon", target_os = "vita", target_os = "nuttx"))] {
+        mod unsupported;
+        use unsupported as imp;
+    } else {
+        mod unix;
+        use unix as imp;
+    }
+}
+
+pub use imp::{ExitStatus, ExitStatusError, Process};
+
+pub use self::common::{Command, CommandArgs, ExitCode, Stdio, StdioPipes};
+pub use crate::ffi::OsString as EnvKey;