91 lines
2.6 KiB
C
91 lines
2.6 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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*/
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/time.h>
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#include <errno.h>
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static volatile int done;
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static volatile int dummy;
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static volatile int no_handler;
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static void
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handler (int sig)
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{
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/* This is more than one write so that the breakpoint location below
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is more than one instruction away. */
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done = 1;
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done = 1;
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done = 1;
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done = 1; /* other handler location */
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} /* handler */
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struct itimerval itime;
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struct sigaction action;
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/* The enum is so that GDB can easily see these macro values. */
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enum {
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itimer_real = ITIMER_REAL,
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itimer_virtual = ITIMER_VIRTUAL
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} itimer = ITIMER_VIRTUAL;
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int
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main ()
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{
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int res;
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/* Set up the signal handler. */
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memset (&action, 0, sizeof (action));
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action.sa_handler = no_handler ? SIG_IGN : handler;
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sigaction (SIGVTALRM, &action, NULL);
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sigaction (SIGALRM, &action, NULL);
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/* The values needed for the itimer. This needs to be at least long
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enough for the setitimer() call to return. */
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memset (&itime, 0, sizeof (itime));
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itime.it_value.tv_usec = 250 * 1000;
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/* Loop for ever, constantly taking an interrupt. */
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while (1)
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{
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/* Set up a one-off timer. A timer, rather than SIGSEGV, is
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used as after a timer handler finishes the interrupted code
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can safely resume. */
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res = setitimer (itimer, &itime, NULL);
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if (res == -1)
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{
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printf ("First call to setitimer failed, errno = %d\r\n",errno);
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itimer = ITIMER_REAL;
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res = setitimer (itimer, &itime, NULL);
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if (res == -1)
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{
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printf ("Second call to setitimer failed, errno = %d\r\n",errno);
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return 1;
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}
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}
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/* Wait. Issue a couple writes to a dummy volatile var to be
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reasonably sure our simple "get-next-pc" logic doesn't
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stumble on branches. */
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dummy = 0; dummy = 0; while (!done);
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done = 0;
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}
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return 0;
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}
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