8  * blocked, and their relation with ucontext.
11  * blocked signals; such a signal, when sent to the process by the kernel,
12  * will get blocked by the process and it may later unblock it and take an
21  * The thread's mask of blocked signals can be permanently changed, i.e, not
29  * program is executing inside the handler, will be blocked; they will be
33  * blocked instances of the same signal are not queued; such a signal will
48 	/* Kernel dumps ucontext with USR2 blocked */  in handler_verify_ucontext()
50 	ksft_test_result(ret == 1, "USR2 blocked in ucontext\n");  in handler_verify_ucontext()
53 	 * USR2 is blocked; can be delivered neither here, nor after  in handler_verify_ucontext()
65 	 * 2. SEGV was blocked even after returning from handler_usr.  in handler_segv()
86 	/* SEGV blocked during handler execution, delivered on return */  in handler_usr()
93 	 * Signal responsible for handler invocation is blocked by default;  in handler_usr()
100 			 "USR1 is blocked, cannot invoke handler right now\n");  in handler_usr()
106 	/* SEGV has been blocked in sa_mask, but ucontext is empty */  in handler_usr()
108 	ksft_test_result(ret == 0, "SEGV not blocked in ucontext\n");  in handler_usr()
110 	/* USR1 has been blocked, but ucontext is empty */  in handler_usr()
112 	ksft_test_result(ret == 0, "USR1 not blocked in ucontext\n");  in handler_usr()
115 	 * Mangle ucontext; this will be copied back into &current->blocked  in handler_usr()
133 	/* Add SEGV to blocked mask */  in main()
136 		ksft_exit_fail_msg("Cannot add SEGV to blocked mask\n");  in main()
154 	/* Mangled ucontext implies USR2 is blocked for current thread */  in main()
169 	 * is blocked  in main()
171 	ksft_print_msg("USR2 still blocked on return from handler\n");  in main()
181 			 "USR2 present in &current->blocked\n");  in main()