From 485122644456c22287659063a2cc89ceb7d88715 Mon Sep 17 00:00:00 2001
From: "xiuhong.wang" <xiuhong.wang@unisoc.com>
Date: Thu, 30 May 2024 10:13:19 +0800
Subject: [PATCH] Fix ionice's return value for getting process IO priority

In the user version, if you use ionice to get the process IO
priority without permission, -1 will be returned, but Idle: prio 7
will be printed at this time. This is an incorrect priority and
should return permission denied.
---
 toys/other/ionice.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/toys/other/ionice.c b/toys/other/ionice.c
index db3a6f41..12642537 100644
--- a/toys/other/ionice.c
+++ b/toys/other/ionice.c
@@ -60,6 +60,7 @@ void ionice_main(void)
   if (toys.optflags == FLAG_p) {
     int p = ioprio_get();
 
+    if (p == -1) perror_exit("read priority");
     xprintf("%s: prio %d\n",
       (char *[]){"unknown", "Realtime", "Best-effort", "Idle"}[(p>>13)&3],
       p&7);
-- 
2.39.2