abort ();
{ if (do_abort > 1 && written) { void *addrs[64]; #define naddrs (sizeof (addrs) / sizeof (addrs[0])) int n = __backtrace (addrs, naddrs); if (n > 2) { #define strnsize(str) str, strlen (str) write (fd, strnsize ("======= Backtrace: =========\n")); __backtrace_symbols_fd (addrs + 1, n - 1, fd);  write (fd, strnsize ("======= Memory map: ========\n")); int fd2 = open ("/proc/self/maps", O_RDONLY); char buf[1024]; ssize_t n2; while ((n2 = read (fd2, buf, sizeof (buf))) > 0) if (write (fd, buf, n2) != n2) break; close (fd2); } }   abort (); }
__libc_message (int do_abort, const char *fmt, ...){  va_list ap;  va_list ap_copy;  int fd = -1;  va_start (ap, fmt);  va_copy (ap_copy, ap);#ifdef FATAL_PREPARE  FATAL_PREPARE;#endif  /* Open a descriptor for /dev/tty unless the user explicitly     requests errors on standard error.  */  const char *on_2 = __secure_getenv ("LIBC_FATAL_STDERR_");  if (on_2 == NULL || *on_2 == '\0')    fd = open_not_cancel_2 (_PATH_TTY, O_RDWR | O_NOCTTY | O_NDELAY);  if (fd == -1)    fd = STDERR_FILENO;  struct str_list *list = NULL;  int nlist = 0;  const char *cp = fmt;  while (*cp != '\0')    {      /* Find the next "%s" or the end of the string.  */      const char *next = cp;      while (next[0] != '%' || next[1] != 's')	{	  next = __strchrnul (next + 1, '%');	  if (next[0] == '\0')	    break;	}      /* Determine what to print.  */      const char *str;      size_t len;      if (cp[0] == '%' && cp[1] == 's')	{	  str = va_arg (ap, const char *);	  len = strlen (str);	  cp += 2;	}      else	{	  str = cp;	  len = next - cp;	  cp = next;	}      struct str_list *newp = alloca (sizeof (struct str_list));      newp->str = str;      newp->len = len;      newp->next = list;      list = newp;      ++nlist;    }  bool written = false;  if (nlist > 0)    {      struct iovec *iov = alloca (nlist * sizeof (struct iovec));      ssize_t total = 0;      for (int cnt = nlist - 1; cnt >= 0; --cnt)	{	  iov[cnt].iov_base = (void *) list->str;	  iov[cnt].iov_len = list->len;	  total += list->len;	  list = list->next;	}      INTERNAL_SYSCALL_DECL (err);      ssize_t cnt;      do	cnt = INTERNAL_SYSCALL (writev, err, 3, fd, iov, nlist);      while (INTERNAL_SYSCALL_ERROR_P (cnt, err)	     && INTERNAL_SYSCALL_ERRNO (cnt, err) == EINTR);      if (cnt == total)	written = true;    }  va_end (ap);  /* If we  had no success writing the message, use syslog.  */  if (! written)    vsyslog (LOG_ERR, fmt, ap_copy);  va_end (ap_copy);  if (do_abort)    /* Terminate the process.  */    abort ();}