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authorGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-04-05 16:59:07 +0200
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-04-05 16:59:07 +0200
commit43d09e79db91110e7ca09610efd0b62fce453b47 (patch)
tree84e5860ca38d44d1de748271d0e437e8b9ac465e /util-linux
parentae5ca6fc417161eb514103d3c2b38add18012760 (diff)
downloadbusybox-43d09e79db91110e7ca09610efd0b62fce453b47.tar.gz
busybox-43d09e79db91110e7ca09610efd0b62fce453b47.tar.bz2
chrt: fix for SCHED_RESET_ON_FORK bit
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'util-linux')
-rw-r--r--util-linux/chrt.c11
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)
);