chrt: fix for SCHED_RESET_ON_FORK bit

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/util-linux/chrt.c b/util-linux/chrt.c
index ede92310f13a57ac31841c9b6fd76eb65f01b0b4..4dd78dabfca41ccbb2976796e148dd35795dc597 100644 (file)
--- a/util-linux/chrt.c
+++ b/util-linux/chrt.c
@@ -135,6 +135,17 @@ int chrt_main(int argc UNUSED_PARAM, char **argv)
                pol = sched_getscheduler(pid);
                if (pol < 0)
                        bb_perror_msg_and_die("can't %cet pid %u's policy", 'g', (int)pid);
+#ifdef SCHED_RESET_ON_FORK
+               /* "Since Linux 2.6.32, the SCHED_RESET_ON_FORK flag
+                * can be ORed in policy when calling sched_setscheduler().
+                * As a result of including this flag, children created by
+                * fork(2) do not inherit privileged scheduling policies"
+                *
+                * This bit is also returned by sched_getscheduler()!
+                * (TODO: do we want to show it?)
+                */
+               pol &= ~SCHED_RESET_ON_FORK;
+#endif
                printf("pid %u's %s scheduling policy: SCHED_%s\n",
                        pid, current_new, policy_name(pol)
                );