chrt: fix for SCHED_RESET_ON_FORK bit

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

1 files changed, 11 insertions, 0 deletions

diff --git a/util-linux/chrt.c b/util-linux/chrt.c
index ede92310f..4dd78dabf 100644
--- 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)
                 );