none/tests/linux/blockfault.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <signal.h>
   4 #include "tests/sys_mman.h"
   5
   6 static void handler(int sig, siginfo_t *info, void *v)
   7 {
   8         printf("info: sig=%d code=%d addr=%p\n",
   9                info->si_signo, info->si_code, info->si_addr);
  10         exit(0);
  11 }
  12
  13 /* Blocking a fault, ie SIGSEGV, won't work, and is the same as having
  14    the default handler */
  15 int main()
  16 {
  17         int* unmapped_page = get_unmapped_page();
  18         struct sigaction sa;
  19         sigset_t mask;
  20
  21         sa.sa_sigaction = handler;
  22         sigemptyset(&sa.sa_mask);
  23         sa.sa_flags = SA_SIGINFO;
  24
  25         sigaction(SIGSEGV, &sa, NULL);
  26
  27         sigfillset(&mask);
  28         sigprocmask(SIG_BLOCK, &mask, NULL);
  29
  30         *(volatile int *)unmapped_page = 213;
  31
  32         return 0;
  33 }