From 73674bd7cac1f224413a7ee734abc7448b198303 Mon Sep 17 00:00:00 2001
From: Eemeli <oneleh@utu.fi>
Date: Sun, 18 Feb 2024 22:19:38 +0200
Subject: [PATCH] WIP fork syscall

---
 crates/kernel/src/syscall.rs | 8 ++++++++
 crates/syscall/src/lib.rs    | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/crates/kernel/src/syscall.rs b/crates/kernel/src/syscall.rs
index 6eac20a94..3ddf48d00 100644
--- a/crates/kernel/src/syscall.rs
+++ b/crates/kernel/src/syscall.rs
@@ -102,6 +102,7 @@ pub fn syscall(args: &mut SyscallRegs) {
         id::SEEK => call_id(seek, args),
 
         id::SYSTEM => call_id(system, args),
+        id::FORK => call_id(fork, args),
 
         other => {
             debug!("invalid syscall ({other})");
@@ -863,3 +864,10 @@ pub fn system(args: &mut SyscallRegs) -> Result<usize> {
 
     Ok(pid.num())
 }
+
+/// fork the current process
+///
+/// [`hyperion_syscall::fork`]
+pub fn fork(_args: &mut SyscallRegs) -> Result<usize> {
+    todo!()
+}
diff --git a/crates/syscall/src/lib.rs b/crates/syscall/src/lib.rs
index f462949dc..7210fa788 100644
--- a/crates/syscall/src/lib.rs
+++ b/crates/syscall/src/lib.rs
@@ -66,6 +66,7 @@ pub mod id {
     pub const SEEK: usize = 32;
 
     pub const SYSTEM: usize = 33;
+    pub const FORK: usize = 34;
 }
 
 //
@@ -383,3 +384,8 @@ pub fn system_with(path: &str, args: &[&str], cfg: LaunchConfig) -> Result<usize
         )
     }
 }
+
+/// fork the current process and return the PID
+pub fn fork() -> Result<usize> {
+    unsafe { syscall_0(id::FORK) }
+}