From 4f64ef0f835d44c9a3220c414a6f35d05cb47690 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sat, 9 Apr 2022 19:09:31 +0200
Subject: kernel: prevent switching processes in syscall handlers

---
 src/kernel/syscalls.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

(limited to 'src/kernel')

diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c
index 855fad8..85db57a 100644
--- a/src/kernel/syscalls.c
+++ b/src/kernel/syscalls.c
@@ -27,11 +27,11 @@ int _syscall_await(void) {
 			has_children = true;
 	}
 
-	if (has_children)
-		process_switch_any(); // wait until a child dies
-	else {
+	if (!has_children) {
 		process_current->state = PS_RUNNING;
 		return ~0; // TODO errno
+	} else {
+		return -1;
 	}
 }
 
@@ -217,9 +217,8 @@ int _syscall_fs_wait(char __user *buf, int max_len, struct fs_wait_response __us
 		struct process *queued = backend->queue;
 		backend->queue = queued->waits4fs.queue_next;
 		return vfs_request_accept(&queued->waits4fs.req);
-	} else {
-		process_switch_any();
 	}
+	return -1;
 }
 
 int _syscall_fs_respond(char __user *buf, int ret) {
-- 
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