From d214326e8e3e23327880bb3a88caad63455651c9 Mon Sep 17 00:00:00 2001
From: Matheus <matheusuky@gmail.com>
Date: Mon, 5 Oct 2026 15:21:42 -0300
Subject: [PATCH] print: add nouserprint argument

For some usecases, silencing syscall_print()s is ideal. A good example
of that is syzkaller, which uses logs to detect crashes and a badly
timed syscall_print() could interfere.

Add a nouserprint argument which skips printing on syscall_print().
---
 kernel-src/sys/syscalls/print.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel-src/sys/syscalls/print.c b/kernel-src/sys/syscalls/print.c
index 311233af..bb4889f9 100644
--- a/kernel-src/sys/syscalls/print.c
+++ b/kernel-src/sys/syscalls/print.c
@@ -4,12 +4,18 @@
 #include <mutex.h>
 #include <util.h>
 #include <arch/cpu.h>
+#include <kernel/kernel_args.h>
+
+DEFINE_KERNEL_ARGUMENT(nouserprint, bool);
 
 syscallret_t syscall_print(context_t *context, char *message) {
 	syscallret_t ret = {
 		.ret = -1
 	};
 
+	if (GET_KERNEL_ARGUMENT(nouserprint, bool))
+		goto leave;
+
 	static MUTEX_DEFINE(mutex);
 
 	size_t len;
@@ -35,6 +41,7 @@ syscallret_t syscall_print(context_t *context, char *message) {
 	arch_e9_putc('\n');
 	MUTEX_RELEASE(&mutex);
 
+leave:
 	ret.errno = 0;
 	ret.ret = 0;
 	return ret;