37 lines
1.2 KiB
Text
37 lines
1.2 KiB
Text
# fpending.m4
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# serial 23
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dnl Copyright (C) 2000-2001, 2004-2025 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl This file is offered as-is, without any warranty.
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dnl From Jim Meyering
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dnl Using code from emacs, based on suggestions from Paul Eggert
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dnl and Ulrich Drepper.
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dnl Find out how to determine the number of pending output bytes on a stream.
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dnl glibc (2.1.93 and newer) and Solaris provide __fpending. On other systems,
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dnl we have to grub around in the (possibly opaque) FILE struct.
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AC_DEFUN([gl_FUNC_FPENDING],
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[
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AC_CHECK_HEADERS_ONCE([stdio_ext.h])
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fp_headers='
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#include <stdio.h>
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#if HAVE_STDIO_EXT_H
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# include <stdio_ext.h>
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#endif
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'
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AC_CACHE_CHECK([for __fpending], [gl_cv_func___fpending],
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[
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM([[$fp_headers]],
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[[return ! __fpending (stdin);]])],
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[gl_cv_func___fpending=yes],
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[gl_cv_func___fpending=no])
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])
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if test $gl_cv_func___fpending = yes; then
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AC_CHECK_DECLS([__fpending], [], [], [$fp_headers])
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fi
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])
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