refactor(mkfifo): remove unsafe libc::mkfifo, use safe rustix::fs::mknodat

Author: sylvestre

Cargo.lock

@@ -24,7 +24,8 @@ uucore = { workspace = true, features = ["fs", "mode"] }
 fluent = { workspace = true }
 
 [target.'cfg(unix)'.dependencies]
-nix = { workspace = true, features = ["fs"] }
+libc = { workspace = true }
+rustix = { workspace = true, features = ["fs"] }
 
 [features]
 selinux = ["uucore/selinux"]

src/uu/mkfifo/Cargo.toml

@@ -4,8 +4,6 @@
 // file that was distributed with this source code.
 
 use clap::{Arg, ArgAction, Command, value_parser};
-use nix::sys::stat::Mode;
-use nix::unistd::mkfifo;
 use std::fs;
 use std::os::unix::fs::PermissionsExt;
 use uucore::display::Quotable;
@@ -48,7 +46,10 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     };
 
     for f in fifos {
-        if mkfifo(f.as_str(), Mode::from_bits_truncate(0o666)).is_err() {
+        let c_path = std::ffi::CString::new(f.as_str()).unwrap();
+        // SAFETY: c_path is a valid null-terminated C string
+        let ret = unsafe { libc::mkfifo(c_path.as_ptr(), 0o666) };
+        if ret != 0 {
             show!(USimpleError::new(
                 1,
                 translate!("mkfifo-error-cannot-create-fifo", "path" => f.quote()),