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106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2004-2018 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 <stdlib.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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static volatile int done[2];
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static volatile int repeats[2];
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static int itimer[2] = { ITIMER_REAL, ITIMER_VIRTUAL };
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static int alarm[2] = { SIGALRM, SIGVTALRM };
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static void
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handler (int sig)
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{
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int sigi;
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switch (sig)
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{
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case SIGALRM: sigi = 0; break;
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case SIGVTALRM: sigi = 1; break;
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default: abort ();
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}
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if (repeats[sigi]++ > 3)
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{
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/* Hit with enough signals, cancel everything and get out. */
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{
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struct itimerval itime;
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memset (&itime, 0, sizeof (itime));
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setitimer (itimer[sigi], &itime, NULL);
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}
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{
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struct sigaction action;
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memset (&action, 0, sizeof (action));
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action.sa_handler = SIG_IGN;
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sigaction (sig, &action, NULL);
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}
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done[sigi] = 1;
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return;
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}
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/* Set up a nested virtual timer. */
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while (1)
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{
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/* Wait until a signal has become pending, that way when this
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handler returns it will be immediatly delivered leading to
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back-to-back signals. */
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sigset_t set;
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sigemptyset (&set);
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if (sigpending (&set) < 0)
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{
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perror ("sigrepeat");
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abort ();
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}
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if (sigismember (&set, sig))
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break;
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}
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} /* handler */
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int
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main ()
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{
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int i;
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/* Set up the signal handler. */
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for (i = 0; i < 2; i++)
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{
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struct sigaction action;
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memset (&action, 0, sizeof (action));
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action.sa_handler = handler;
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sigaction (alarm[i], &action, NULL);
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}
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/* Set up a rapidly repeating timers. A timer, rather than SIGSEGV,
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is used as after a timer handler returns the interrupted code can
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safely resume. The intent is for the program to swamp GDB with a
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backlog of pending signals. */
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for (i = 0; i < 2; i++)
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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_interval.tv_usec = 1;
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itime.it_value.tv_usec = 250 * 1000;
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setitimer (itimer[i], &itime, NULL);
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}
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/* Wait. */
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while (!done[0] && !done[1]); /* infinite loop */
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return 0;
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}
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