1 /* This testcase is part of GDB, the GNU debugger.
3 Copyright 2004-2019 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/>. */
24 enum level { MAIN, OUTER, INNER, LEAF, NR_LEVELS };
26 /* Levels completed flag. */
27 volatile enum level level = NR_LEVELS;
29 void catcher (int signal);
32 thrower (enum level next_level, int sig, int itimer, int on_stack)
35 /* Set up the signal handler. */
38 memset (&act, 0, sizeof (act));
39 act.sa_handler = catcher;
40 act.sa_flags |= on_stack;
41 sigaction (sig, &act, NULL);
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
47 struct itimerval itime;
48 memset (&itime, 0, sizeof (itime));
49 itime.it_value.tv_usec = 250 * 1000;
50 setitimer (itimer, &itime, NULL);
53 while (level != LEAF);
59 /* Find the next level. */
63 thrower (OUTER, SIGALRM, ITIMER_REAL, SA_ONSTACK);
66 thrower (INNER, SIGVTALRM, ITIMER_VIRTUAL, SA_ONSTACK);
78 /* Set up the altstack. */
80 static char stack[SIGSTKSZ * NR_LEVELS];
82 memset (&alt, 0, sizeof (alt));
84 alt.ss_size = SIGSTKSZ;
86 if (sigaltstack (&alt, NULL) < 0)
88 perror ("sigaltstack");