process-util: add sched_{policy,priority}_is_valid()

src/basic/process-util.h

@@ -20,6 +20,7 @@
 ***/
 
 #include <alloca.h>
+#include <sched.h>
 #include <signal.h>
 #include <stdbool.h>
 #include <stddef.h>
@@ -110,6 +111,14 @@ static inline bool nice_is_valid(int n) {
         return n >= PRIO_MIN && n < PRIO_MAX;
 }
 
+static inline bool sched_policy_is_valid(int i) {
+        return IN_SET(i, SCHED_OTHER, SCHED_BATCH, SCHED_IDLE, SCHED_FIFO, SCHED_RR);
+}
+
+static inline bool sched_priority_is_valid(int i) {
+        return i >= 0 && i <= sched_get_priority_max(SCHED_RR);
+}
+
 static inline bool ioprio_class_is_valid(int i) {
         return IN_SET(i, IOPRIO_CLASS_NONE, IOPRIO_CLASS_RT, IOPRIO_CLASS_BE, IOPRIO_CLASS_IDLE);
 }