Fix

process_context/Cargo.toml

@@ -9,6 +9,7 @@ readme.workspace = true
 repository.workspace = true
 
 [features]
+libc = []
 std = ["dep:once_cell"]
 
 [dependencies]

process_context/src/lib.rs

@@ -8,11 +8,15 @@ extern crate alloc;
 #[cfg(feature = "std")]
 extern crate std;
 
+#[cfg(feature = "libc")]
+mod libc;
 #[cfg(feature = "std")]
 mod os;
 mod process_context;
 mod void;
 
+#[cfg(feature = "libc")]
+pub use libc::LibcProcessContext;
 #[cfg(feature = "std")]
 pub use os::OsProcessContext;
 pub use process_context::ProcessContext;

process_context/src/libc.rs

@@ -0,0 +1,30 @@
+use crate::ProcessContext;
+use core::{ffi::CStr, slice};
+
+/// A process context based on libc.
+#[derive(Debug)]
+pub struct LibcProcessContext {
+    arguments: &'static [*const i8],
+}
+
+impl LibcProcessContext {
+    /// Creates a process context.
+    pub unsafe fn new(argc: isize, argv: *const *const i8) -> Self {
+        Self {
+            arguments: unsafe { slice::from_raw_parts(argv, argc as _) },
+        }
+    }
+}
+
+impl ProcessContext for LibcProcessContext {
+    fn command_line_rev(&self) -> impl IntoIterator<Item = &str> {
+        self.arguments
+            .iter()
+            .rev()
+            .map(|&argument| unsafe { CStr::from_ptr(argument) }.to_str().unwrap())
+    }
+
+    fn environment_variables(&self) -> impl IntoIterator<Item = (&str, &str)> {
+        []
+    }
+}