Add more from the std

library/std/src/sys/io/error/generic.rs

@@ -0,0 +1,15 @@
+pub fn errno() -> i32 {
+    0
+}
+
+pub fn is_interrupted(_code: i32) -> bool {
+    false
+}
+
+pub fn decode_error_kind(_code: i32) -> crate::io::ErrorKind {
+    crate::io::ErrorKind::Uncategorized
+}
+
+pub fn error_string(_errno: i32) -> String {
+    "operation successful".to_string()
+}

library/std/src/sys/io/error/mod.rs

@@ -0,0 +1,56 @@
+cfg_select! {
+    target_os = "hermit" => {
+        mod hermit;
+        pub use hermit::*;
+    }
+    target_os = "motor" => {
+        mod motor;
+        pub use motor::*;
+    }
+    all(target_vendor = "fortanix", target_env = "sgx") => {
+        mod sgx;
+        pub use sgx::*;
+    }
+    target_os = "solid_asp3" => {
+        mod solid;
+        pub use solid::*;
+    }
+    target_os = "teeos" => {
+        mod teeos;
+        pub use teeos::*;
+    }
+    target_os = "uefi" => {
+        mod uefi;
+        pub use uefi::*;
+    }
+    target_family = "unix" => {
+        mod unix;
+        pub use unix::*;
+    }
+    target_os = "wasi" => {
+        mod wasi;
+        pub use wasi::*;
+    }
+    target_os = "windows" => {
+        mod windows;
+        pub use windows::*;
+    }
+    target_os = "xous" => {
+        mod xous;
+        pub use xous::*;
+    }
+    any(
+        target_os = "vexos",
+        target_family = "wasm",
+        target_os = "zkvm",
+        target_os = "survos",
+    ) => {
+        mod generic;
+        pub use generic::*;
+    }
+}
+
+pub type RawOsError = cfg_select! {
+    target_os = "uefi" => usize,
+    _ => i32,
+};