105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
|
/* This testcase is part of GDB, the GNU debugger.
|
||
|
|
|
||
|
|
Copyright 2004, 2005 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
This program is free software; you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation; either version 2 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
This program is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with this program; if not, write to the Free Software
|
||
|
|
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <signal.h>
|
||
|
|
#include <sys/time.h>
|
||
|
|
|
||
|
|
static volatile int done[2];
|
||
|
|
static volatile int repeats[2];
|
||
|
|
static int itimer[2] = { ITIMER_REAL, ITIMER_VIRTUAL };
|
||
|
|
static int alarm[2] = { SIGALRM, SIGVTALRM };
|
||
|
|
|
||
|
|
static void
|
||
|
|
handler (int sig)
|
||
|
|
{
|
||
|
|
int sigi;
|
||
|
|
switch (sig)
|
||
|
|
{
|
||
|
|
case SIGALRM: sigi = 0; break;
|
||
|
|
case SIGVTALRM: sigi = 1; break;
|
||
|
|
default: abort ();
|
||
|
|
}
|
||
|
|
if (repeats[sigi]++ > 3)
|
||
|
|
{
|
||
|
|
/* Hit with enough signals, cancel everything and get out. */
|
||
|
|
{
|
||
|
|
struct itimerval itime;
|
||
|
|
memset (&itime, 0, sizeof (itime));
|
||
|
|
setitimer (itimer[sigi], &itime, NULL);
|
||
|
|
}
|
||
|
|
{
|
||
|
|
struct sigaction action;
|
||
|
|
memset (&action, 0, sizeof (action));
|
||
|
|
action.sa_handler = SIG_IGN;
|
||
|
|
sigaction (sig, &action, NULL);
|
||
|
|
}
|
||
|
|
done[sigi] = 1;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
/* Set up a nested virtual timer. */
|
||
|
|
while (1)
|
||
|
|
{
|
||
|
|
/* Wait until a signal has become pending, that way when this
|
||
|
|
handler returns it will be immediatly delivered leading to
|
||
|
|
back-to-back signals. */
|
||
|
|
sigset_t set;
|
||
|
|
sigemptyset (&set);
|
||
|
|
if (sigpending (&set) < 0)
|
||
|
|
{
|
||
|
|
perror ("sigrepeat");
|
||
|
|
abort ();
|
||
|
|
}
|
||
|
|
if (sigismember (&set, sig))
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
} /* handler */
|
||
|
|
|
||
|
|
main ()
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
/* Set up the signal handler. */
|
||
|
|
for (i = 0; i < 2; i++)
|
||
|
|
{
|
||
|
|
struct sigaction action;
|
||
|
|
memset (&action, 0, sizeof (action));
|
||
|
|
action.sa_handler = handler;
|
||
|
|
sigaction (alarm[i], &action, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set up a rapidly repeating timers. A timer, rather than SIGSEGV,
|
||
|
|
is used as after a timer handler returns the interrupted code can
|
||
|
|
safely resume. The intent is for the program to swamp GDB with a
|
||
|
|
backlog of pending signals. */
|
||
|
|
for (i = 0; i < 2; i++)
|
||
|
|
{
|
||
|
|
struct itimerval itime;
|
||
|
|
memset (&itime, 0, sizeof (itime));
|
||
|
|
itime.it_interval.tv_usec = 1;
|
||
|
|
itime.it_value.tv_usec = 250 * 1000;
|
||
|
|
setitimer (itimer[i], &itime, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Wait. */
|
||
|
|
while (!done[0] && !done[1]); /* infinite loop */
|
||
|
|
return 0;
|
||
|
|
}
|