7  *  1997-11-02  Modified for POSIX.1b signals by Richard Henderson
11  *		to allow signals to be sent reliably.
98 	/* Only allow kernel generated signals to this kthread */  in sig_task_ignored()
109 	 * Blocked signals are never ignored, since the  in sig_ignored()
129  * signals, globally pending signals, and blocked signals.
188 	/* Have any signals or users of TIF_SIGPENDING been delayed  in calculate_sigpending()
213 	 * synchronous signals that need to be dequeued first.  in next_signal()
491  * Flush all pending signals for this kthread.
545 	/* If dying, we handle all new signals by ignoring them */  in unhandled_signal()
578 		 * posix-timer signals are preallocated and freed when the last  in collect_signal()
582 		 * ignoring preallocated signals.  in collect_signal()
684 		/* Synchronous signals have a positive si_code */  in dequeue_synchronous_signal()
748 /* Remove signals in mask from the pending set and queue. */
862  * Handle magic process-wide effects of stop/continue signals. Unlike
866  * signals. The process stop is done as a signal action for SIG_DFL.
895 		 * Remove all stop signals from all queues, wake all threads.  in prepare_signal()
942  * have pending signals.  Such threads will dequeue from the shared queue
978 		 * It will dequeue unblocked signals before it runs again.  in complete_signal()
1037 static inline bool legacy_queue(struct sigpending *signals, int sig)  in legacy_queue()  argument
1039 	return (sig < SIGRTMIN) && sigismember(&signals->signal, sig);  in legacy_queue()
1058 	 * Short-circuit ignored signals and support queuing  in __send_signal_locked()
1074 	 * Real-time signals must be queued if sent by sigqueue, or  in __send_signal_locked()
1139 	/* Let multiprocess signals appear after on-going forks */  in __send_signal_locked()
1193 		/* Don't ignore kernel generated signals */  in send_signal_locked()
1260 __setup("print-fatal-signals=", setup_print_fatal_signals);
1790 	 * Signals generated by perf events should not terminate the whole  in send_sig_perf()
1804  * force_sig_seccomp - signals the task to allow in-process syscall emulation
1897  * These functions handle POSIX timer signals. POSIX timers use
1898  * preallocated sigqueue structs for sending signals.
1961  * Where type is not PIDTYPE_PID, signals must be delivered to the
1994 	 * Update @tmr::sigqueue_seq for posix timer signals with sighand  in posixtimer_send_sigqueue()
2012 			 * expiry queued it because blocked signals are  in posixtimer_send_sigqueue()
2374 	 * signals here to prevent ptrace_stop sleeping in schedule.  in ptrace_stop()
2492 	 * Queued signals ignored us while we were stopped for tracing.  in ptrace_stop()
2529  * do_signal_stop - handle group stop for SIGSTOP and other stop signals
2573 		 * usual behavior as two consecutive stop signals can't  in do_signal_stop()
2906 		 * Signals generated by the execution of an instruction  in get_signal()
2907 		 * need to be delivered before any other pending signals  in get_signal()
2928 		/* Trace actually delivered signals. */  in get_signal()
2950 		 * Global init gets no signals it doesn't want.  in get_signal()
2951 		 * Container-init gets no signals it doesn't want from same  in get_signal()
2966 			 * the thread group.  The job control signals  in get_signal()
2977 				/* signals can be posted during this window */  in get_signal()
3023 		 * PF_USER_WORKER threads will catch and exit on fatal signals  in get_signal()
3032 		 * Death signals, no core dump.  in get_signal()
3048  * signal_delivered - called after signal delivery to update blocked signals
3053  * delivered. It updates the blocked signals accordingly (@ksig->ka.sa.sa_mask
3088  * the shared signals in @which since we will not.
3105 		/* Remove the signals this thread can handle. */  in retarget_shared_pending()
3136 	 * From now this task is not visible for group-wide signals,  in exit_signals()
3190 		/* A set of now blocked but previously unblocked signals. */  in __set_task_blocked()
3229  * (or permanently) block certain signals.
3232  * interface happily blocks "unblockable" signals like SIGKILL
3312  *  sys_rt_sigprocmask - change the list of currently blocked signals
3313  *  @how: whether to add, remove, or set signals
3314  *  @nset: stores pending signals
3387  *  @uset: stores pending signals
3740  *  do_sigtimedwait - wait for queued signals specified in @which
3741  *  @which: queued signals to wait for
3762 	 * Invert the set of allowed signals to get those we want to block.  in do_sigtimedwait()
3797  *  sys_rt_sigtimedwait - synchronously wait for queued signals specified
3799  *  @uthese: queued signals to wait for
4037 		/* Only allow sending arbitrary signals to yourself. */  in do_pidfd_send_signal()
4194 	/* Not even root can pretend to send signals from the kernel.  in do_rt_sigqueueinfo()
4241 	/* Not even root can pretend to send signals from the kernel.  in do_rt_tgsigqueueinfo()
4539  *  sys_sigpending - examine pending signals
4572  *  sys_sigprocmask - examine and change blocked signals
4573  *  @how: whether to add, remove, or set signals
4574  *  @nset: signals to add or remove (if non-null)
4990 		.procname	= "print-fatal-signals",
5017  * kdb_send_sig - Allows kdb to send signals without exposing