[git commit] chrt: fix for SCHED_RESET_ON_FORK bit

Denys Vlasenko vda.linux at googlemail.com
Fri Apr 5 14:59:07 UTC 2019


commit: https://git.busybox.net/busybox/commit/?id=43d09e79db91110e7ca09610efd0b62fce453b47
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 util-linux/chrt.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

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)
 		);


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