ps: remove libc in ps

Handling unsafe uucore::libc::getsid functions with Rustix

Cargo.lock

@@ -2277,8 +2277,8 @@ version = "0.0.1"
 dependencies = [
  "chrono",
  "clap",
- "nix 0.30.1",
  "prettytable-rs",
+ "rustix",
  "uu_pgrep",
  "uucore",
 ]

src/uu/ps/Cargo.toml

@@ -14,11 +14,11 @@ version.workspace = true
 workspace = true
 
 [dependencies]
-uucore = { workspace = true, features = ["utmpx", "libc"] }
+uucore = { workspace = true, features = ["utmpx"] }
 clap = { workspace = true }
 chrono = { workspace = true, default-features = false, features = ["clock"] }
 prettytable-rs = { workspace = true }
-nix = { workspace = true }
+rustix = { workspace = true, features = ["fs", "process", "std", "termios"] }
 
 uu_pgrep = { path = "../pgrep" }
 

src/uu/ps/src/process_selection.rs

@@ -8,20 +8,15 @@ use std::collections::HashSet;
 use uu_pgrep::process::{walk_process, ProcessInformation, RunState, Teletype};
 use uucore::error::UResult;
 
-#[cfg(target_family = "unix")]
-use nix::errno::Errno;
-
 // TODO: Temporary add to this file, this function will add to uucore.
 #[cfg(not(target_os = "redox"))]
 #[cfg(target_family = "unix")]
 fn getsid(pid: i32) -> Option<i32> {
-    unsafe {
-        let result = uucore::libc::getsid(pid);
-        if Errno::last() == Errno::UnknownErrno {
-            Some(result)
-        } else {
-            None
-        }
+    use rustix::process::Pid;
+
+    match rustix::process::getsid(Pid::from_raw(pid)) {
+        Ok(sid) => Some(sid.as_raw_nonzero().get()),
+        Err(_) => None,
     }
 }