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+# poll_h.m4 serial 6
+dnl Copyright (C) 2010-2023 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.
+
+dnl Written by Bruno Haible.
+
+AC_DEFUN_ONCE([gl_POLL_H],
+[
+ dnl Ensure to expand the default settings once only, before all statements
+ dnl that occur in other macros.
+ AC_REQUIRE([gl_POLL_H_DEFAULTS])
+
+ AC_CHECK_HEADERS_ONCE([poll.h])
+ if test $ac_cv_header_poll_h = yes; then
+ HAVE_POLL_H=1
+ else
+ HAVE_POLL_H=0
+ fi
+ AC_SUBST([HAVE_POLL_H])
+
+ dnl <poll.h> is always overridden, because of GNULIB_POSIXCHECK.
+ gl_CHECK_NEXT_HEADERS([poll.h])
+
+ gl_PREREQ_SYS_H_WINSOCK2 dnl for HAVE_WINSOCK2_H
+
+ dnl Check for declarations of anything we want to poison if the
+ dnl corresponding gnulib module is not in use.
+ gl_WARN_ON_USE_PREPARE([[#include <poll.h>]],
+ [poll])
+])
+
+# gl_POLL_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
+AC_DEFUN([gl_POLL_MODULE_INDICATOR],
+[
+ dnl Ensure to expand the default settings once only.
+ gl_POLL_H_REQUIRE_DEFAULTS
+ gl_MODULE_INDICATOR_SET_VARIABLE([$1])
+ dnl Define it also as a C macro, for the benefit of the unit tests.
+ gl_MODULE_INDICATOR_FOR_TESTS([$1])
+])
+
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd. It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_POLL_H_REQUIRE_DEFAULTS],
+[
+ m4_defun(GL_MODULE_INDICATOR_PREFIX[_POLL_H_MODULE_INDICATOR_DEFAULTS], [
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_POLL])
+ ])
+ m4_require(GL_MODULE_INDICATOR_PREFIX[_POLL_H_MODULE_INDICATOR_DEFAULTS])
+ AC_REQUIRE([gl_POLL_H_DEFAULTS])
+])
+
+AC_DEFUN([gl_POLL_H_DEFAULTS],
+[
+ dnl Assume proper GNU behavior unless another module says otherwise.
+ HAVE_POLL=1; AC_SUBST([HAVE_POLL])
+ REPLACE_POLL=0; AC_SUBST([REPLACE_POLL])
+])