From 08619630e9c7b638354323b443937701811b11d4 Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Fri, 14 Oct 2022 15:33:00 +0300
Subject: add spawn syscall

+ Prefer over unixy fork/exec for speed since I don't want to support
  cow. Shell redirection should be done with env server and cooperating
  libc.
---
 common/uapi/dispatch.c  |  1 +
 common/uapi/proc.c      | 12 ++++++++++++
 include/apos/syscalls.h |  3 +++
 include/apos/uapi.h     | 15 +++++++++++++++
 4 files changed, 31 insertions(+)

diff --git a/common/uapi/dispatch.c b/common/uapi/dispatch.c
index f2a12d6..db15b62 100644
--- a/common/uapi/dispatch.c
+++ b/common/uapi/dispatch.c
@@ -42,6 +42,7 @@ static const sys_t syscall_table[] = {
 	[SYS_CREATE] = sys_create,
 	[SYS_FORK] = sys_fork,
 	[SYS_EXEC] = sys_exec,
+	[SYS_SPAWN] = sys_spawn,
 	[SYS_SWAP] = sys_swap,
 	[SYS_ASSIGN] = sys_assign,
 
diff --git a/common/uapi/proc.c b/common/uapi/proc.c
index c8078db..d1d2bd7 100644
--- a/common/uapi/proc.c
+++ b/common/uapi/proc.c
@@ -82,6 +82,18 @@ SYSCALL_DEFINE2(exec)(sys_arg_t bin, sys_arg_t interp){
 	return (struct sys_ret){ prepare_proc(r, bin, interp), 0, 0, 0, 0, 0 };
 }
 
+/**
+ * Spawn syscall handler.
+ *
+ * @param bin Binary to execute.
+ * @param interp Optional interpreter binary.
+ * @return \see prepare_proc() and 0.
+ */
+SYSCALL_DEFINE2(spawn)(sys_arg_t bin, sys_arg_t interp)
+{
+	/* @todo implement */
+}
+
 /**
  * Kill syscall handler.
  *
diff --git a/include/apos/syscalls.h b/include/apos/syscalls.h
index 5a3f2eb..a5b7e18 100644
--- a/include/apos/syscalls.h
+++ b/include/apos/syscalls.h
@@ -95,6 +95,9 @@ enum {
 	/** Execute new binary in process space. */
 	SYS_EXEC,
 
+	/** Execute new binary in new process space. */
+	SYS_SPAWN,
+
 	/** Kill thread. */
 	SYS_KILL,
 
diff --git a/include/apos/uapi.h b/include/apos/uapi.h
index cca728b..02e8816 100644
--- a/include/apos/uapi.h
+++ b/include/apos/uapi.h
@@ -534,6 +534,21 @@ SYSCALL_DECLARE0(fork);
  */
 SYSCALL_DECLARE2(exec, bin, interp);
 
+/**
+ * Spawn binary syscall. Try to prefer over unixy fork/exec.
+ *
+ * Executes a new binary in new process space.
+ *
+ * @param bin Address of binary.
+ * @param interp Optional address of interpreter.
+ * @param c Unused.
+ * @param d Unused.
+ * @param e Unused.
+ * @return \ref OK and 0.
+ * \todo Check other return codes.
+ */
+SYSCALL_DECLARE2(spawn, bin, interp);
+
 /**
  * Kill syscall.
  *
-- 
cgit v1.3