From 2faad79559c71fc555a0c254107710f7e8de5121 Mon Sep 17 00:00:00 2001
From: kamkow1 <kamkow256@gmail.com>
Date: Mon, 24 Nov 2025 01:00:53 +0100
Subject: [PATCH] diagdummy Add srpr2 subcommand for contiguous printing to
 serial (and testing access races)

---
 user/diagdummy/diagdummy.c |  2 +-
 user/diagdummy/serial.c    | 19 ++++++++++++++++++-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/user/diagdummy/diagdummy.c b/user/diagdummy/diagdummy.c
index f76bddc..dbffe8a 100644
--- a/user/diagdummy/diagdummy.c
+++ b/user/diagdummy/diagdummy.c
@@ -2,7 +2,7 @@
 
 #define CMDS(X)           \
   X(block)      X(openf)  \
-  X(serialprint)
+  X(srpr)       X(srpr2)  \
 
 void main(void) {
   if (argslen() == 0) {
diff --git a/user/diagdummy/serial.c b/user/diagdummy/serial.c
index 04e9848..59980d8 100644
--- a/user/diagdummy/serial.c
+++ b/user/diagdummy/serial.c
@@ -7,7 +7,7 @@
 #define RECVB     2
 #define RECVREADY 3
 
-void diagdummy_serialprint(void) {
+void diagdummy_srpr(void) {
   char *str = "Hello world\n";
 
   if (argslen() >= 2) {
@@ -24,3 +24,20 @@ void diagdummy_serialprint(void) {
     s++;
   }
 }
+
+void diagdummy_srpr2(void) {
+  if (argslen() < 2) {
+    return;
+  }
+    
+  char *str = args()[1];
+
+  Dev_t serialdev;
+  dev_gethandle(&serialdev, "serialdev");
+
+  for (;;) {
+    while (!dev_cmd(&serialdev, SENDREADY, NULL, 0));
+    dev_cmd(&serialdev, SENDB, str, 1);
+    schedsleep(500);
+  }
+}