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Diffstat (limited to 'src/grep/m4/fpending.m4')
| -rw-r--r-- | src/grep/m4/fpending.m4 | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/grep/m4/fpending.m4 b/src/grep/m4/fpending.m4 new file mode 100644 index 0000000..131356a --- /dev/null +++ b/src/grep/m4/fpending.m4 @@ -0,0 +1,36 @@ +# serial 23 + +# Copyright (C) 2000-2001, 2004-2021 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 +]) |