+# serial 1
+# See if we need to provide mkfifo replacement.
+
+dnl Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+# Written by Eric Blake.
+
+AC_DEFUN([gl_FUNC_MKFIFO],
+[
+ AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([mkfifo])
+ if test $ac_cv_func_mkfifo = no; then
+ HAVE_MKFIFO=0
+ AC_LIBOBJ([mkfifo])
+ else
+ dnl Check for Solaris 9 and FreeBSD bug with trailing slash.
+ AC_CHECK_FUNCS_ONCE([lstat])
+ AC_CACHE_CHECK([whether mkfifo rejects trailing slashes],
+ [gl_cv_func_mkfifo_works],
+ [# Assume that if we have lstat, we can also check symlinks.
+ if test $ac_cv_func_lstat = yes; then
+ ln -s conftest.tmp conftest.lnk
+ fi
+ AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <sys/stat.h>
+]], [[if (!mkfifo ("conftest.tmp/", 0600)) return 1;
+#if HAVE_LSTAT
+ if (!mkfifo ("conftest.lnk/", 0600)) return 2;
+#endif
+ ]])],
+ [gl_cv_func_mkfifo_works=yes], [gl_cv_func_mkfifo_works=no],
+ [gl_cv_func_mkfifo_works="guessing no"])
+ rm -f conftest.tmp conftest.lnk])
+ if test "$gl_cv_func_mkfifo_works" != yes; then
+ AC_DEFINE([MKFIFO_TRAILING_SLASH_BUG], [1], [Define to 1 if mkfifo
+ does not reject trailing slash])
+ REPLACE_MKFIFO=1
+ AC_LIBOBJ([mkfifo])
+ fi
+ fi
+])