regress/lib/libc/siginfo/sigsegv/sigsegv.c

   1 /* $NetBSD: sigsegv.c,v 1.4 2003/11/13 06:48:31 simonb Exp $ */
   2
   3 #include <sys/ucontext.h>
   4
   5 #include <assert.h>
   6 #include <signal.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9
  10 void
  11 sigsegv(int signo, siginfo_t *info, void *ptr)
  12 {
  13 #ifdef DEBUG
  14         printf("%d %p %p\n", signo, info, ptr);
  15         if (info != NULL) {
  16                 printf("si_signo=%d\n", info->si_signo);
  17                 printf("si_errno=%d\n", info->si_errno);
  18                 printf("si_code=%d\n", info->si_code);
  19                 printf("si_trap=%d\n", info->si_trap);
  20                 printf("si_addr=%p\n", info->si_addr);
  21         }
  22         if (ptr != NULL) {
  23                 ucontext_t *ctx = ptr;
  24                 int i;
  25                 mcontext_t *mc = &ctx->uc_mcontext;
  26                 printf("uc_flags 0x%x\n", ctx->uc_flags);
  27                 printf("uc_link %p\n", ctx->uc_link);
  28                 for (i = 0; i < sizeof(ctx->uc_sigmask.__bits) /
  29                     sizeof(ctx->uc_sigmask.__bits[0]); i++)
  30                         printf("uc_sigmask[%d] 0x%x\n", i,
  31                             ctx->uc_sigmask.__bits[i]);
  32                 printf("uc_stack %p %lu 0x%x\n", ctx->uc_stack.ss_sp,
  33                     (unsigned long)ctx->uc_stack.ss_size,
  34                     ctx->uc_stack.ss_flags);
  35                 for (i = 0; i < sizeof(mc->__gregs)/sizeof(mc->__gregs[0]); i++)
  36                         printf("uc_mcontext.greg[%d] 0x%x\n", i,
  37                             mc->__gregs[i]);
  38         }
  39 #endif
  40         assert(info->si_signo == SIGSEGV);
  41         assert(info->si_errno == 0);
  42         assert(info->si_code == SEGV_MAPERR);
  43         assert(info->si_addr == (void *)0);
  44         exit(0);
  45 }
  46
  47 int
  48 main(void)
  49 {
  50         struct sigaction sa;
  51         sa.sa_flags = SA_SIGINFO;
  52         sa.sa_sigaction = sigsegv;
  53         sigemptyset(&sa.sa_mask);
  54         sigaction(SIGSEGV, &sa, NULL);
  55         *(long *)0 = 0;
  56         return 0;
  57 }