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1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
7b6bb8da | 3 | Copyright 2004, 2007, 2008, 2009, 2010, 2011 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 |
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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 | |
44f4de1a | 15 | You should have received a copy of the GNU General Public License |
c7b778ff | 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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17 | |
18 | #include <signal.h> | |
19 | #include <stdio.h> | |
e425eb2b MC |
20 | #include <stdlib.h> |
21 | #include <string.h> | |
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22 | #include <sys/time.h> |
23 | ||
24 | enum level { MAIN, OUTER, INNER, LEAF, NR_LEVELS }; | |
25 | ||
26 | /* Levels completed flag. */ | |
27 | volatile enum level level = NR_LEVELS; | |
28 | ||
29 | void catcher (int signal); | |
30 | ||
31 | void | |
32 | thrower (enum level next_level, int sig, int itimer, int on_stack) | |
33 | { | |
34 | level = next_level; | |
35 | /* Set up the signal handler. */ | |
36 | { | |
37 | struct sigaction act; | |
38 | memset (&act, 0, sizeof (act)); | |
39 | act.sa_handler = catcher; | |
40 | act.sa_flags |= on_stack; | |
41 | sigaction (sig, &act, NULL); | |
42 | } | |
43 | /* Set up a one-off timer. A timer, rather than SIGSEGV, is used as | |
44 | after a timer handler finishes the interrupted code can safely | |
45 | resume. */ | |
46 | { | |
47 | struct itimerval itime; | |
48 | memset (&itime, 0, sizeof (itime)); | |
49 | itime.it_value.tv_usec = 250 * 1000; | |
50 | setitimer (itimer, &itime, NULL); | |
51 | } | |
52 | /* Wait. */ | |
53 | while (level != LEAF); | |
54 | } | |
55 | ||
56 | void | |
57 | catcher (int signal) | |
58 | { | |
59 | /* Find the next level. */ | |
60 | switch (level) | |
61 | { | |
62 | case MAIN: | |
63 | thrower (OUTER, SIGALRM, ITIMER_REAL, SA_ONSTACK); | |
64 | break; | |
65 | case OUTER: | |
66 | thrower (INNER, SIGVTALRM, ITIMER_VIRTUAL, SA_ONSTACK); | |
67 | break; | |
68 | case INNER: | |
69 | level = LEAF; | |
70 | return; | |
71 | } | |
72 | } | |
73 | ||
74 | ||
75 | main () | |
76 | { | |
77 | /* Set up the altstack. */ | |
78 | { | |
79 | static char stack[SIGSTKSZ * NR_LEVELS]; | |
6bdae935 | 80 | stack_t alt; |
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81 | memset (&alt, 0, sizeof (alt)); |
82 | alt.ss_sp = stack; | |
83 | alt.ss_size = SIGSTKSZ; | |
84 | alt.ss_flags = 0; | |
85 | if (sigaltstack (&alt, NULL) < 0) | |
86 | { | |
87 | perror ("sigaltstack"); | |
88 | exit (0); | |
89 | } | |
90 | } | |
91 | level = MAIN; | |
92 | catcher (0); | |
93 | } |