LibC: Add getpriority() and setpriority() stubs

Expected behavior left as a FIXME is outlined here:
https://pubs.opengroup.org/onlinepubs/7908799/xsh/getpriority.html

3 files changed, 31 insertions, 0 deletions

diff --git a/Userland/Libraries/LibC/CMakeLists.txt b/Userland/Libraries/LibC/CMakeLists.txt
index aab4d8aa9b..42d9704355 100644
--- a/Userland/Libraries/LibC/CMakeLists.txt
+++ b/Userland/Libraries/LibC/CMakeLists.txt
@@ -22,6 +22,7 @@ set(LIBC_SOURCES
     net.cpp
     netdb.cpp
     poll.cpp
+    priority.cpp
     pthread_forward.cpp
     pthread_integration.cpp
     pthread_tls.cpp
diff --git a/Userland/Libraries/LibC/priority.cpp b/Userland/Libraries/LibC/priority.cpp
new file mode 100644
index 0000000000..05b97c731a
--- /dev/null
+++ b/Userland/Libraries/LibC/priority.cpp
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Format.h>
+#include <sys/resource.h>
+
+extern "C" {
+
+int getpriority([[maybe_unused]] int which, [[maybe_unused]] id_t who)
+{
+    dbgln("FIXME: Implement getpriority()");
+    return -1;
+}
+
+int setpriority([[maybe_unused]] int which, [[maybe_unused]] id_t who, [[maybe_unused]] int value)
+{
+    dbgln("FIXME: Implement setpriority()");
+    return -1;
+}
+}
diff --git a/Userland/Libraries/LibC/sys/resource.h b/Userland/Libraries/LibC/sys/resource.h
index 488b0de6d6..7d3f265396 100644
--- a/Userland/Libraries/LibC/sys/resource.h
+++ b/Userland/Libraries/LibC/sys/resource.h
@@ -58,4 +58,11 @@ struct rlimit {
 int getrlimit(int, struct rlimit*);
 int setrlimit(int, struct rlimit const*);
 
+#define PRIO_PROCESS 0
+#define PRIO_PGRP 1
+#define PRIO_USER 2
+
+int getpriority(int, id_t);
+int setpriority(int, id_t, int);
+
 __END_DECLS