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[/] [scarts/] [trunk/] [toolchain/] [scarts-gdb/] [gdb-6.8/] [gdb/] [testsuite/] [gdb.base/] [sigaltstack.c] - Blame information for rev 25

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1 25 jlechner
/* This testcase is part of GDB, the GNU debugger.
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   Copyright 2004, 2007, 2008 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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   Please email any bugs, comments, and/or additions to this file to:
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   bug-gdb@prep.ai.mit.edu  */
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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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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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}

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