From 825baedbe0036995f622f50889323d1a926120ff Mon Sep 17 00:00:00 2001
From: Able <abl3theabove@gmail.com>
Date: Thu, 10 Feb 2022 23:54:16 -0600
Subject: [PATCH] rework libwasm

---
 src/lib.rs                 |  3 +++
 src/process/mod.rs         |  6 ++++++
 src/process/signals.rs     |  8 +++++++
 src/syscalls.rs            |  4 ----
 src/syscalls/file_calls.rs | 43 ++++++++++++++++++++++++++++++++++++++
 src/syscalls/mod.rs        | 24 +++++++++++++++++++++
 src/syscalls/time_calls.rs | 19 +++++++++++++++++
 7 files changed, 103 insertions(+), 4 deletions(-)
 create mode 100644 src/process/mod.rs
 create mode 100644 src/process/signals.rs
 delete mode 100644 src/syscalls.rs
 create mode 100644 src/syscalls/file_calls.rs
 create mode 100644 src/syscalls/mod.rs
 create mode 100644 src/syscalls/time_calls.rs

diff --git a/src/lib.rs b/src/lib.rs
index 9c4ee35..43d8d95 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,8 @@
+#![no_std]
+
 #[macro_use]
 pub mod logger;
+pub mod process;
 pub mod syscalls;
 
 pub use core::*;
diff --git a/src/process/mod.rs b/src/process/mod.rs
new file mode 100644
index 0000000..cab46e3
--- /dev/null
+++ b/src/process/mod.rs
@@ -0,0 +1,6 @@
+pub mod signals;
+
+/// Process Identification
+#[derive(Clone, Copy, PartialEq, Debug)]
+#[repr(C)]
+pub struct PID(pub usize);
diff --git a/src/process/signals.rs b/src/process/signals.rs
new file mode 100644
index 0000000..8df469d
--- /dev/null
+++ b/src/process/signals.rs
@@ -0,0 +1,8 @@
+#[repr(C)]
+/// Signals that can be sent to a process
+pub enum Signals {
+    /// Terminate the process
+    Terminate,
+    /// Shutdown the process and allow it to shutdown cleanly
+    Quit,
+}
diff --git a/src/syscalls.rs b/src/syscalls.rs
deleted file mode 100644
index 376456f..0000000
--- a/src/syscalls.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-/// All system calls are defined here.
-extern "C" {
-    pub fn add(a: u32, b: u32) -> u32;
-}
diff --git a/src/syscalls/file_calls.rs b/src/syscalls/file_calls.rs
new file mode 100644
index 0000000..653eced
--- /dev/null
+++ b/src/syscalls/file_calls.rs
@@ -0,0 +1,43 @@
+//! File system related system calls.
+
+/// Temporary representation of a file path
+pub type Path = *const u8;
+
+/// Remove a Directory from the filesystem
+///
+/// # Arguments
+/// * `full_path` - The full path of the directory to remove
+/// * `force` - Whether to remove the directory even if it is not empty
+#[no_mangle]
+pub extern "C" fn remove_directory(path: Path, force_delete: bool) {
+    unimplemented!();
+}
+
+/// Create a new directory at the given path
+///
+/// # Arguments
+/// * `full_path` - The full path of the directory to create
+#[no_mangle]
+pub extern "C" fn create_directory(path: Path) -> FSReturns {
+    unimplemented!();
+}
+
+#[repr(C)]
+/// A return used by the file related system calls
+pub enum FSReturns {
+    /// The system call was successful
+    Ok,
+
+    /// The directory can not be created
+    DirectoryCouldNotBeCreated,
+    /// The directory could not be removed
+    DirectoryCouldNotBeRemoved,
+    ///
+    FileCouldNotBeCreated,
+    ///
+    FileCouldNotBeRemoved,
+    /// The file could not be opened
+    FileCouldNotBeOpened,
+    ///
+    FileCouldNotBeClosed,
+}
diff --git a/src/syscalls/mod.rs b/src/syscalls/mod.rs
new file mode 100644
index 0000000..e618ae8
--- /dev/null
+++ b/src/syscalls/mod.rs
@@ -0,0 +1,24 @@
+#![deny(missing_docs)]
+//! The module of syscalls.
+
+use crate::process::{signals::Signals, PID};
+
+pub mod file_calls;
+pub mod time_calls;
+
+#[no_mangle]
+/// All system calls are defined here.
+extern "C" {
+
+    /// Send a signal to a process
+    ///
+    /// # Arguments
+    ///
+    /// * `pid` - The PID of the process to send the signal to
+    /// * `signal` - The signal to send
+    pub fn send_signal(pid: PID, signal: Signals) -> bool;
+
+    /// A temporary function to test the syscall interface
+    pub fn add(a: u32, b: u32) -> u32;
+
+}
diff --git a/src/syscalls/time_calls.rs b/src/syscalls/time_calls.rs
new file mode 100644
index 0000000..258b4ad
--- /dev/null
+++ b/src/syscalls/time_calls.rs
@@ -0,0 +1,19 @@
+//! Time related system calls.
+
+/// Seconds and milliseconds since the Unix epoch.
+#[repr(C)]
+pub struct SecondsTime {
+    seconds: u64,
+    milliseconds: u64,
+}
+
+extern "C" {
+    /// Sleep the calling process for the given number of milliseconds
+    pub fn sleep(time: SecondsTime);
+
+    /// Get the current time in seconds, milliseconds
+    pub fn get_time() -> SecondsTime;
+
+    /// Set the current time in seconds, milliseconds
+    pub fn set_time(time: SecondsTime);
+}