consider exit-on-segv to be an exceptional exit status, per common un…

…ix convention

src/init.c

@@ -169,7 +169,7 @@ static void jl_find_stack_bottom(void)
 // what to do on SIGINT
 DLLEXPORT void jl_sigint_action(void)
 {
- if (exit_on_sigint) jl_exit(0);
+ if (exit_on_sigint) jl_exit(130); // 128+SIGINT
  jl_throw(jl_interrupt_exception);
 }
 
@@ -363,7 +363,7 @@ static BOOL WINAPI sigint_handler(DWORD wsig) //This needs winapi types to guara
  }
  else {
  jl_signal_pending = 0;
- if (exit_on_sigint) jl_exit(0);
+ if (exit_on_sigint) jl_exit(130);
  if ((DWORD)-1 == SuspendThread(hMainThread)) {
  //error
  jl_safe_printf("error: SuspendThread failed\n");
@@ -770,7 +770,7 @@ void *mach_segv_listener(void *arg)
  while (1) {
  int ret = mach_msg_server(exc_server,2048,segv_port,MACH_MSG_TIMEOUT_NONE);
  jl_safe_printf("mach_msg_server: %s\n", mach_error_string(ret));
- jl_exit(1);
+ jl_exit(128+SIGSEGV);
  }
 }