From baa4c5e085d81b2021b25adaba61d32e3f835a56 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Wed, 18 Aug 2021 17:36:16 +0200
Subject: fork() now has a return value; you can tell the child and parent
 apart

---
 src/kernel/syscalls.c | 6 +++---
 src/kernel/syscalls.h | 3 ++-
 2 files changed, 5 insertions(+), 4 deletions(-)

(limited to 'src/kernel')

diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c
index e160270..6a61a9d 100644
--- a/src/kernel/syscalls.c
+++ b/src/kernel/syscalls.c
@@ -17,9 +17,9 @@ _Noreturn void _syscall_exit(const char *msg, size_t len) {
 }
 
 int _syscall_fork() {
-	struct process *orig = process_current;
-	process_current = process_fork(orig);
-	process_switch(process_current);
+	struct process *child = process_fork(process_current);
+	regs_savereturn(&child->regs, 0);
+	return 1;
 }
 
 int _syscall_debuglog(const char *msg, size_t len) {
diff --git a/src/kernel/syscalls.h b/src/kernel/syscalls.h
index 78a47b2..d3ad2a8 100644
--- a/src/kernel/syscalls.h
+++ b/src/kernel/syscalls.h
@@ -16,7 +16,8 @@ enum {
 _Noreturn void _syscall_exit(const char *msg, size_t len);
 
 /** Creates a copy of the current process, and executes it.
- * All user memory pages get copied too. Doesn't return anything useful.. yet.
+ * All user memory pages get copied too.
+ * @return 0 in the child, a meaningless positive value in the parent.
  */
 int _syscall_fork();
 
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