diff options
Diffstat (limited to 'kernel/signal.c')
-rw-r--r-- | kernel/signal.c | 192 |
1 files changed, 96 insertions, 96 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index 0298bd3d431b..3479a118ba1c 100644 --- a/kernel/signal.c +++ b/kernel/signal.c | |||
@@ -652,6 +652,102 @@ static void handle_stop_signal(int sig, struct task_struct *p) | |||
652 | } | 652 | } |
653 | } | 653 | } |
654 | 654 | ||
655 | /* | ||
656 | * Test if P wants to take SIG. After we've checked all threads with this, | ||
657 | * it's equivalent to finding no threads not blocking SIG. Any threads not | ||
658 | * blocking SIG were ruled out because they are not running and already | ||
659 | * have pending signals. Such threads will dequeue from the shared queue | ||
660 | * as soon as they're available, so putting the signal on the shared queue | ||
661 | * will be equivalent to sending it to one such thread. | ||
662 | */ | ||
663 | static inline int wants_signal(int sig, struct task_struct *p) | ||
664 | { | ||
665 | if (sigismember(&p->blocked, sig)) | ||
666 | return 0; | ||
667 | if (p->flags & PF_EXITING) | ||
668 | return 0; | ||
669 | if (sig == SIGKILL) | ||
670 | return 1; | ||
671 | if (task_is_stopped_or_traced(p)) | ||
672 | return 0; | ||
673 | return task_curr(p) || !signal_pending(p); | ||
674 | } | ||
675 | |||
676 | static void | ||
677 | __group_complete_signal(int sig, struct task_struct *p) | ||
678 | { | ||
679 | struct signal_struct *signal = p->signal; | ||
680 | struct task_struct *t; | ||
681 | |||
682 | /* | ||
683 | * Now find a thread we can wake up to take the signal off the queue. | ||
684 | * | ||
685 | * If the main thread wants the signal, it gets first crack. | ||
686 | * Probably the least surprising to the average bear. | ||
687 | */ | ||
688 | if (wants_signal(sig, p)) | ||
689 | t = p; | ||
690 | else if (thread_group_empty(p)) | ||
691 | /* | ||
692 | * There is just one thread and it does not need to be woken. | ||
693 | * It will dequeue unblocked signals before it runs again. | ||
694 | */ | ||
695 | return; | ||
696 | else { | ||
697 | /* | ||
698 | * Otherwise try to find a suitable thread. | ||
699 | */ | ||
700 | t = signal->curr_target; | ||
701 | while (!wants_signal(sig, t)) { | ||
702 | t = next_thread(t); | ||
703 | if (t == signal->curr_target) | ||
704 | /* | ||
705 | * No thread needs to be woken. | ||
706 | * Any eligible threads will see | ||
707 | * the signal in the queue soon. | ||
708 | */ | ||
709 | return; | ||
710 | } | ||
711 | signal->curr_target = t; | ||
712 | } | ||
713 | |||
714 | /* | ||
715 | * Found a killable thread. If the signal will be fatal, | ||
716 | * then start taking the whole group down immediately. | ||
717 | */ | ||
718 | if (sig_fatal(p, sig) && !(signal->flags & SIGNAL_GROUP_EXIT) && | ||
719 | !sigismember(&t->real_blocked, sig) && | ||
720 | (sig == SIGKILL || !(t->ptrace & PT_PTRACED))) { | ||
721 | /* | ||
722 | * This signal will be fatal to the whole group. | ||
723 | */ | ||
724 | if (!sig_kernel_coredump(sig)) { | ||
725 | /* | ||
726 | * Start a group exit and wake everybody up. | ||
727 | * This way we don't have other threads | ||
728 | * running and doing things after a slower | ||
729 | * thread has the fatal signal pending. | ||
730 | */ | ||
731 | signal->flags = SIGNAL_GROUP_EXIT; | ||
732 | signal->group_exit_code = sig; | ||
733 | signal->group_stop_count = 0; | ||
734 | t = p; | ||
735 | do { | ||
736 | sigaddset(&t->pending.signal, SIGKILL); | ||
737 | signal_wake_up(t, 1); | ||
738 | } while_each_thread(p, t); | ||
739 | return; | ||
740 | } | ||
741 | } | ||
742 | |||
743 | /* | ||
744 | * The signal is already in the shared-pending queue. | ||
745 | * Tell the chosen thread to wake up and dequeue it. | ||
746 | */ | ||
747 | signal_wake_up(t, sig == SIGKILL); | ||
748 | return; | ||
749 | } | ||
750 | |||
655 | static inline int legacy_queue(struct sigpending *signals, int sig) | 751 | static inline int legacy_queue(struct sigpending *signals, int sig) |
656 | { | 752 | { |
657 | return (sig < SIGRTMIN) && sigismember(&signals->signal, sig); | 753 | return (sig < SIGRTMIN) && sigismember(&signals->signal, sig); |
@@ -817,102 +913,6 @@ force_sig_specific(int sig, struct task_struct *t) | |||
817 | force_sig_info(sig, SEND_SIG_FORCED, t); | 913 | force_sig_info(sig, SEND_SIG_FORCED, t); |
818 | } | 914 | } |
819 | 915 | ||
820 | /* | ||
821 | * Test if P wants to take SIG. After we've checked all threads with this, | ||
822 | * it's equivalent to finding no threads not blocking SIG. Any threads not | ||
823 | * blocking SIG were ruled out because they are not running and already | ||
824 | * have pending signals. Such threads will dequeue from the shared queue | ||
825 | * as soon as they're available, so putting the signal on the shared queue | ||
826 | * will be equivalent to sending it to one such thread. | ||
827 | */ | ||
828 | static inline int wants_signal(int sig, struct task_struct *p) | ||
829 | { | ||
830 | if (sigismember(&p->blocked, sig)) | ||
831 | return 0; | ||
832 | if (p->flags & PF_EXITING) | ||
833 | return 0; | ||
834 | if (sig == SIGKILL) | ||
835 | return 1; | ||
836 | if (task_is_stopped_or_traced(p)) | ||
837 | return 0; | ||
838 | return task_curr(p) || !signal_pending(p); | ||
839 | } | ||
840 | |||
841 | static void | ||
842 | __group_complete_signal(int sig, struct task_struct *p) | ||
843 | { | ||
844 | struct signal_struct *signal = p->signal; | ||
845 | struct task_struct *t; | ||
846 | |||
847 | /* | ||
848 | * Now find a thread we can wake up to take the signal off the queue. | ||
849 | * | ||
850 | * If the main thread wants the signal, it gets first crack. | ||
851 | * Probably the least surprising to the average bear. | ||
852 | */ | ||
853 | if (wants_signal(sig, p)) | ||
854 | t = p; | ||
855 | else if (thread_group_empty(p)) | ||
856 | /* | ||
857 | * There is just one thread and it does not need to be woken. | ||
858 | * It will dequeue unblocked signals before it runs again. | ||
859 | */ | ||
860 | return; | ||
861 | else { | ||
862 | /* | ||
863 | * Otherwise try to find a suitable thread. | ||
864 | */ | ||
865 | t = signal->curr_target; | ||
866 | while (!wants_signal(sig, t)) { | ||
867 | t = next_thread(t); | ||
868 | if (t == signal->curr_target) | ||
869 | /* | ||
870 | * No thread needs to be woken. | ||
871 | * Any eligible threads will see | ||
872 | * the signal in the queue soon. | ||
873 | */ | ||
874 | return; | ||
875 | } | ||
876 | signal->curr_target = t; | ||
877 | } | ||
878 | |||
879 | /* | ||
880 | * Found a killable thread. If the signal will be fatal, | ||
881 | * then start taking the whole group down immediately. | ||
882 | */ | ||
883 | if (sig_fatal(p, sig) && !(signal->flags & SIGNAL_GROUP_EXIT) && | ||
884 | !sigismember(&t->real_blocked, sig) && | ||
885 | (sig == SIGKILL || !(t->ptrace & PT_PTRACED))) { | ||
886 | /* | ||
887 | * This signal will be fatal to the whole group. | ||
888 | */ | ||
889 | if (!sig_kernel_coredump(sig)) { | ||
890 | /* | ||
891 | * Start a group exit and wake everybody up. | ||
892 | * This way we don't have other threads | ||
893 | * running and doing things after a slower | ||
894 | * thread has the fatal signal pending. | ||
895 | */ | ||
896 | signal->flags = SIGNAL_GROUP_EXIT; | ||
897 | signal->group_exit_code = sig; | ||
898 | signal->group_stop_count = 0; | ||
899 | t = p; | ||
900 | do { | ||
901 | sigaddset(&t->pending.signal, SIGKILL); | ||
902 | signal_wake_up(t, 1); | ||
903 | } while_each_thread(p, t); | ||
904 | return; | ||
905 | } | ||
906 | } | ||
907 | |||
908 | /* | ||
909 | * The signal is already in the shared-pending queue. | ||
910 | * Tell the chosen thread to wake up and dequeue it. | ||
911 | */ | ||
912 | signal_wake_up(t, sig == SIGKILL); | ||
913 | return; | ||
914 | } | ||
915 | |||
916 | int | 916 | int |
917 | __group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p) | 917 | __group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p) |
918 | { | 918 | { |