static void
die (int signo)
{
char const *message =
signo ? program_error_message : stack_overflow_message;
segv_action (signo);
write (STDERR_FILENO, program_name, strlen (program_name));
write (STDERR_FILENO, ": ", 2);
write (STDERR_FILENO, message, strlen (message));
write (STDERR_FILENO, "\n", 1);
if (! signo)
_exit (exit_failure);
kill (getpid (), signo);
abort ();
}
static void
die (int signo)
{
char const *message;
segv_action (signo);
message = signo ? program_error_message : stack_overflow_message;
ignore_value (write (STDERR_FILENO, program_name, strlen (program_name)));
ignore_value (write (STDERR_FILENO, ": ", 2));
ignore_value (write (STDERR_FILENO, message, strlen (message)));
ignore_value (write (STDERR_FILENO, "\n", 1));
if (! signo)
_exit (exit_failure);
raise (signo);
abort ();
}
static void
die (int signo)
{
char const *message;
#if !SIGINFO_WORKS && !HAVE_LIBSIGSEGV
/* We can't easily determine whether it is a stack overflow; so
assume that the rest of our program is perfect (!) and that
this segmentation violation is a stack overflow. */
signo = 0;
#endif /* !SIGINFO_WORKS && !HAVE_LIBSIGSEGV */
segv_action (signo);
message = signo ? program_error_message : stack_overflow_message;
ignore_value (write (STDERR_FILENO, program_name, strlen (program_name)));
ignore_value (write (STDERR_FILENO, ": ", 2));
ignore_value (write (STDERR_FILENO, message, strlen (message)));
ignore_value (write (STDERR_FILENO, "\n", 1));
if (! signo)
_exit (exit_failure);
raise (signo);
abort ();
}
static void
segv_handler (int signo, siginfo_t *info, void *context)
{
/* Clear SIGNO if it seems to have been a stack overflow. */
if (0 < info->si_code)
{
/* If the faulting address is within the stack, or within one
page of the stack end, assume that it is a stack
overflow. */
ucontext_t const *user_context = context;
char const *stack_min = user_context->uc_stack.ss_sp;
size_t stack_size = user_context->uc_stack.ss_size;
char const *faulting_address = info->si_addr;
size_t s = faulting_address - stack_min;
size_t page_size = sysconf (_SC_PAGESIZE);
if (find_stack_direction (0) < 0)
s += page_size;
if (s < stack_size + page_size)
signo = 0;
}
segv_action (signo, info, context);
}
