| # serial 22 |
| |
| # Copyright (C) 2000-2001, 2004-2019 Free Software Foundation, Inc. |
| # This file is free software; the Free Software Foundation |
| # gives unlimited permission to copy and/or distribute it, |
| # with or without modifications, as long as this notice is preserved. |
| |
| dnl From Jim Meyering |
| dnl Using code from emacs, based on suggestions from Paul Eggert |
| dnl and Ulrich Drepper. |
| |
| dnl Find out how to determine the number of pending output bytes on a stream. |
| dnl glibc (2.1.93 and newer) and Solaris provide __fpending. On other systems, |
| dnl we have to grub around in the (possibly opaque) FILE struct. |
| |
| AC_DEFUN([gl_FUNC_FPENDING], |
| [ |
| AC_CHECK_HEADERS_ONCE([stdio_ext.h]) |
| fp_headers=' |
| #include <stdio.h> |
| #if HAVE_STDIO_EXT_H |
| # include <stdio_ext.h> |
| #endif |
| ' |
| AC_CACHE_CHECK([for __fpending], [gl_cv_func___fpending], |
| [ |
| AC_LINK_IFELSE( |
| [AC_LANG_PROGRAM([$fp_headers], |
| [[return ! __fpending (stdin);]])], |
| [gl_cv_func___fpending=yes], |
| [gl_cv_func___fpending=no]) |
| ]) |
| if test $gl_cv_func___fpending = yes; then |
| AC_CHECK_DECLS([__fpending], [], [], [$fp_headers]) |
| fi |
| ]) |