1 /* This testcase is part of GDB, the GNU debugger.
3 Copyright 2004, 2007 Free Software Foundation, Inc.
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
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
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.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 Please email any bugs, comments, and/or additions to this file to:
19 bug-gdb@prep.ai.mit.edu */
27 enum level { MAIN, OUTER, INNER, LEAF, NR_LEVELS };
29 /* Levels completed flag. */
30 volatile enum level level = NR_LEVELS;
32 void catcher (int signal);
35 thrower (enum level next_level, int sig, int itimer, int on_stack)
38 /* Set up the signal handler. */
41 memset (&act, 0, sizeof (act));
42 act.sa_handler = catcher;
43 act.sa_flags |= on_stack;
44 sigaction (sig, &act, NULL);
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
50 struct itimerval itime;
51 memset (&itime, 0, sizeof (itime));
52 itime.it_value.tv_usec = 250 * 1000;
53 setitimer (itimer, &itime, NULL);
56 while (level != LEAF);
62 /* Find the next level. */
66 thrower (OUTER, SIGALRM, ITIMER_REAL, SA_ONSTACK);
69 thrower (INNER, SIGVTALRM, ITIMER_VIRTUAL, SA_ONSTACK);
80 /* Set up the altstack. */
82 static char stack[SIGSTKSZ * NR_LEVELS];
84 memset (&alt, 0, sizeof (alt));
86 alt.ss_size = SIGSTKSZ;
88 if (sigaltstack (&alt, NULL) < 0)
90 perror ("sigaltstack");