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1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
32d0add0 | 3 | Copyright 2004-2015 Free Software Foundation, Inc. |
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4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 7 | the Free Software Foundation; either version 3 of the License, or |
9d799f85 AC |
8 | (at your option) any later version. |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
a9762ec7 | 14 | |
9d799f85 | 15 | You should have received a copy of the GNU General Public License |
a9762ec7 | 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
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17 | |
18 | */ | |
19 | ||
20 | #include <stdio.h> | |
984971d0 | 21 | #include <stdlib.h> |
9d799f85 AC |
22 | #include <string.h> |
23 | #include <signal.h> | |
24 | #include <sys/time.h> | |
25 | ||
26 | static volatile int done[2]; | |
27 | static volatile int repeats[2]; | |
28 | static int itimer[2] = { ITIMER_REAL, ITIMER_VIRTUAL }; | |
29 | static int alarm[2] = { SIGALRM, SIGVTALRM }; | |
30 | ||
31 | static void | |
32 | handler (int sig) | |
33 | { | |
34 | int sigi; | |
35 | switch (sig) | |
36 | { | |
37 | case SIGALRM: sigi = 0; break; | |
38 | case SIGVTALRM: sigi = 1; break; | |
39 | default: abort (); | |
40 | } | |
41 | if (repeats[sigi]++ > 3) | |
42 | { | |
43 | /* Hit with enough signals, cancel everything and get out. */ | |
44 | { | |
45 | struct itimerval itime; | |
46 | memset (&itime, 0, sizeof (itime)); | |
47 | setitimer (itimer[sigi], &itime, NULL); | |
48 | } | |
49 | { | |
50 | struct sigaction action; | |
51 | memset (&action, 0, sizeof (action)); | |
52 | action.sa_handler = SIG_IGN; | |
53 | sigaction (sig, &action, NULL); | |
54 | } | |
55 | done[sigi] = 1; | |
56 | return; | |
57 | } | |
58 | /* Set up a nested virtual timer. */ | |
59 | while (1) | |
60 | { | |
61 | /* Wait until a signal has become pending, that way when this | |
62 | handler returns it will be immediatly delivered leading to | |
63 | back-to-back signals. */ | |
64 | sigset_t set; | |
65 | sigemptyset (&set); | |
66 | if (sigpending (&set) < 0) | |
67 | { | |
68 | perror ("sigrepeat"); | |
69 | abort (); | |
70 | } | |
71 | if (sigismember (&set, sig)) | |
72 | break; | |
73 | } | |
74 | } /* handler */ | |
75 | ||
984971d0 | 76 | int |
9d799f85 AC |
77 | main () |
78 | { | |
79 | int i; | |
80 | /* Set up the signal handler. */ | |
81 | for (i = 0; i < 2; i++) | |
82 | { | |
83 | struct sigaction action; | |
84 | memset (&action, 0, sizeof (action)); | |
85 | action.sa_handler = handler; | |
86 | sigaction (alarm[i], &action, NULL); | |
87 | } | |
88 | ||
89 | /* Set up a rapidly repeating timers. A timer, rather than SIGSEGV, | |
90 | is used as after a timer handler returns the interrupted code can | |
91 | safely resume. The intent is for the program to swamp GDB with a | |
92 | backlog of pending signals. */ | |
93 | for (i = 0; i < 2; i++) | |
94 | { | |
95 | struct itimerval itime; | |
96 | memset (&itime, 0, sizeof (itime)); | |
97 | itime.it_interval.tv_usec = 1; | |
98 | itime.it_value.tv_usec = 250 * 1000; | |
99 | setitimer (itimer[i], &itime, NULL); | |
100 | } | |
101 | ||
102 | /* Wait. */ | |
103 | while (!done[0] && !done[1]); /* infinite loop */ | |
104 | return 0; | |
105 | } |