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1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
9b254dd1 | 3 | Copyright 2004, 2007, 2008 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 |
a9762ec7 | 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
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17 | |
18 | Please email any bugs, comments, and/or additions to this file to: | |
19 | bug-gdb@prep.ai.mit.edu */ | |
20 | ||
21 | #include <signal.h> | |
22 | #include <stdio.h> | |
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23 | #include <stdlib.h> |
24 | #include <string.h> | |
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25 | #include <sys/time.h> |
26 | ||
27 | enum level { MAIN, OUTER, INNER, LEAF, NR_LEVELS }; | |
28 | ||
29 | /* Levels completed flag. */ | |
30 | volatile enum level level = NR_LEVELS; | |
31 | ||
32 | void catcher (int signal); | |
33 | ||
34 | void | |
35 | thrower (enum level next_level, int sig, int itimer, int on_stack) | |
36 | { | |
37 | level = next_level; | |
38 | /* Set up the signal handler. */ | |
39 | { | |
40 | struct sigaction act; | |
41 | memset (&act, 0, sizeof (act)); | |
42 | act.sa_handler = catcher; | |
43 | act.sa_flags |= on_stack; | |
44 | sigaction (sig, &act, NULL); | |
45 | } | |
46 | /* Set up a one-off timer. A timer, rather than SIGSEGV, is used as | |
47 | after a timer handler finishes the interrupted code can safely | |
48 | resume. */ | |
49 | { | |
50 | struct itimerval itime; | |
51 | memset (&itime, 0, sizeof (itime)); | |
52 | itime.it_value.tv_usec = 250 * 1000; | |
53 | setitimer (itimer, &itime, NULL); | |
54 | } | |
55 | /* Wait. */ | |
56 | while (level != LEAF); | |
57 | } | |
58 | ||
59 | void | |
60 | catcher (int signal) | |
61 | { | |
62 | /* Find the next level. */ | |
63 | switch (level) | |
64 | { | |
65 | case MAIN: | |
66 | thrower (OUTER, SIGALRM, ITIMER_REAL, SA_ONSTACK); | |
67 | break; | |
68 | case OUTER: | |
69 | thrower (INNER, SIGVTALRM, ITIMER_VIRTUAL, SA_ONSTACK); | |
70 | break; | |
71 | case INNER: | |
72 | level = LEAF; | |
73 | return; | |
74 | } | |
75 | } | |
76 | ||
77 | ||
78 | main () | |
79 | { | |
80 | /* Set up the altstack. */ | |
81 | { | |
82 | static char stack[SIGSTKSZ * NR_LEVELS]; | |
6bdae935 | 83 | stack_t alt; |
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84 | memset (&alt, 0, sizeof (alt)); |
85 | alt.ss_sp = stack; | |
86 | alt.ss_size = SIGSTKSZ; | |
87 | alt.ss_flags = 0; | |
88 | if (sigaltstack (&alt, NULL) < 0) | |
89 | { | |
90 | perror ("sigaltstack"); | |
91 | exit (0); | |
92 | } | |
93 | } | |
94 | level = MAIN; | |
95 | catcher (0); | |
96 | } |