From 0c980f46060d2124686326f238cf2d37ebee5103 Mon Sep 17 00:00:00 2001
From: roblabla <robinlambertz+dev@gmail.com>
Date: Wed, 25 Mar 2020 23:02:50 +0100
Subject: [PATCH] Implement error and mach_error

---
 src/error.rs      | 58 +++++++++++++++++++++++++++++++++++++++++++++++
 src/lib.rs        |  3 ++-
 src/mach_error.rs | 10 ++++++++
 3 files changed, 70 insertions(+), 1 deletion(-)
 create mode 100644 src/error.rs
 create mode 100644 src/mach_error.rs

diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..64c1253
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,58 @@
+//! This module roughly corresponds to `mach/error.h`.
+
+use crate::kern_return::kern_return_t;
+
+pub type mach_error_t = kern_return_t;
+//pub type mach_error_fn_t = Option<unsafe extern fn() -> mach_error_t>;
+//pub const err_none: mach_error_t = 0;
+pub const ERR_SUCCESS: mach_error_t = 0;
+//pub const ERR_ROUTINE_NIL: mach_error_fn_t = None;
+
+pub const fn err_system(x: i32) -> i32 {
+    (x & 0x3f) << 26
+}
+
+pub const fn err_sub(x: i32) -> i32 {
+    (x & 0xfff) << 14
+}
+
+pub const fn err_get_system(err: mach_error_t) -> i32 {
+    (err >> 26) & 0x3f
+}
+
+pub const fn err_get_sub(err: mach_error_t) -> i32 {
+    (err >> 14) & 0xfff
+}
+
+pub const fn err_get_code(err: mach_error_t) -> i32 {
+    err & 0x3fff
+}
+
+pub const system_emask: i32 = err_system(0x3f);
+pub const sub_emask: i32 = err_sub(0xfff);
+pub const code_emask: i32 = 0x3fff;
+
+// Major error sytems
+/// Kernel
+pub const err_kern: i32 = err_system(0x0);
+/// User space library
+pub const err_us: i32 = err_system(0x1);
+/// User space servers
+pub const err_server: i32 = err_system(0x2);
+/// Old IPC errors
+pub const err_ipc: i32 = err_system(0x3);
+/// Mach-IPC errors
+pub const err_mach_ipc: i32 = err_system(0x4);
+/// Distributed IPC
+pub const err_dipc: i32 = err_system(0x7);
+/// User defined errors
+pub const err_local: i32 = err_system(0x3e);
+/// (Compatibility) Mach-IPC errors
+pub const err_ipc_compat: i32 = err_system(0x3f);
+
+pub const err_max_system: i32 = 0x3f;
+
+/// Unix errors get lumped into one subsystem
+pub const fn unix_err(errno: i32) -> mach_error_t {
+    err_kern | err_sub(3) | errno
+}
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index faec2cb..e646161 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -30,10 +30,11 @@ pub mod clock_priv;
 pub mod clock_reply;
 pub mod clock_types; // TODO: test
 pub mod dyld_kernel;
-// pub mod error; // TODO
+pub mod error;
 pub mod exc;
 pub mod exception_types;
 pub mod kern_return;
+pub mod mach_error;
 pub mod mach_init;
 pub mod mach_port;
 pub mod mach_time;
diff --git a/src/mach_error.rs b/src/mach_error.rs
new file mode 100644
index 0000000..6e5b6ac
--- /dev/null
+++ b/src/mach_error.rs
@@ -0,0 +1,10 @@
+//! This module roughly corresponds to `mach/mach_error.h`.
+
+use crate::error::mach_error_t;
+use libc::c_char;
+
+extern "C" {
+    pub fn mach_error_string(error_value: mach_error_t) -> *mut c_char;
+    pub fn mach_error(s: *mut c_char, error_value: mach_error_t);
+    pub fn mach_error_type(error_value: mach_error_t) -> *mut c_char;
+}
\ No newline at end of file