95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2004-2015 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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enum level { MAIN, OUTER, INNER, LEAF, NR_LEVELS };
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/* Levels completed flag. */
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volatile enum level level = NR_LEVELS;
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void catcher (int signal);
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void
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thrower (enum level next_level, int sig, int itimer, int on_stack)
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{
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level = next_level;
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/* Set up the signal handler. */
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{
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struct sigaction act;
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memset (&act, 0, sizeof (act));
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act.sa_handler = catcher;
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act.sa_flags |= on_stack;
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sigaction (sig, &act, NULL);
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}
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/* Set up a one-off timer. A timer, rather than SIGSEGV, is used as
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after a timer handler finishes the interrupted code can safely
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resume. */
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{
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struct itimerval itime;
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memset (&itime, 0, sizeof (itime));
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itime.it_value.tv_usec = 250 * 1000;
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setitimer (itimer, &itime, NULL);
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}
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/* Wait. */
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while (level != LEAF);
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}
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void
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catcher (int signal)
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{
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/* Find the next level. */
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switch (level)
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{
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case MAIN:
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thrower (OUTER, SIGALRM, ITIMER_REAL, SA_ONSTACK);
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break;
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case OUTER:
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thrower (INNER, SIGVTALRM, ITIMER_VIRTUAL, SA_ONSTACK);
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break;
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case INNER:
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level = LEAF;
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return;
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}
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}
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int
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main ()
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{
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/* Set up the altstack. */
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{
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static char stack[SIGSTKSZ * NR_LEVELS];
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stack_t alt;
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memset (&alt, 0, sizeof (alt));
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alt.ss_sp = stack;
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alt.ss_size = SIGSTKSZ;
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alt.ss_flags = 0;
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if (sigaltstack (&alt, NULL) < 0)
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{
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perror ("sigaltstack");
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exit (0);
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}
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}
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level = MAIN;
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catcher (0);
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return 0;
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}
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