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/* Test the stack overflow handler. */
#include "sigsegv.h"
#ifdef HAVE_STACK_OVERFLOW_RECOVERY
#ifndef _WIN32
#include "config.h"
#endif
#include <stddef.h> /* needed for NULL on SunOS4 */
#include <stdio.h> /* for printf */
#include <setjmp.h>
jmp_buf mainloop;
#include <signal.h>
#ifdef HAVE_SETRLIMIT
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#endif
int pass = 0;
void stackoverflow_handler (int emergency, stackoverflow_context_t scp)
{
pass++;
printf("Stack overflow %d caught.\n",pass);
sigsegv_leave_handler();
longjmp(mainloop, emergency ? -1 : pass);
}
int recurse (int n)
{
if (n >= 0)
return n + recurse(n+1);
else
return 0;
}
int main ()
{
char mystack[16384];
#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_STACK)
/* Before starting the endless recursion, try to be friendly to the user's
machine. If you install a Linux 2.2.x kernel on a SuSE 5.3 Linux system,
you end up with no stack limit for user processes at all. We don't want
to kill such systems. */
struct rlimit rl;
rl.rlim_cur = rl.rlim_max = 0x100000; /* 1 MB */
setrlimit(RLIMIT_STACK,&rl);
#endif
if (stackoverflow_install_handler(&stackoverflow_handler,mystack,sizeof(mystack)) < 0)
exit(0);
switch (setjmp(mainloop)) {
case -1:
printf("emergency exit\n"); exit(1);
case 0: case 1:
printf("Starting recursion pass %d.\n",pass+1);
recurse(0);
printf("no endless recursion?!\n"); exit(1);
case 2:
printf("Test passed.\n"); exit(0);
default:
abort();
}
}
#else
int main ()
{
return 0;
}
#endif
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