3 dnl Copyright (C) 2008-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 dnl Written by Bruno Haible.
10 AC_DEFUN_ONCE([gl_SYS_IOCTL_H],
12 dnl Ensure to expand the default settings once only, before all statements
13 dnl that occur in other macros.
14 AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
16 AC_CHECK_HEADERS_ONCE([sys/ioctl.h])
17 if test $ac_cv_header_sys_ioctl_h = yes; then
19 dnl Test whether <sys/ioctl.h> declares ioctl(), or whether some other
20 dnl header file, such as <unistd.h> or <stropts.h>, is needed for that.
21 AC_CACHE_CHECK([whether <sys/ioctl.h> declares ioctl],
22 [gl_cv_decl_ioctl_in_sys_ioctl_h],
23 [dnl We cannot use AC_CHECK_DECL because it produces its own messages.
26 [[#include <sys/ioctl.h>]],
28 [gl_cv_decl_ioctl_in_sys_ioctl_h=yes],
29 [gl_cv_decl_ioctl_in_sys_ioctl_h=no])
34 AC_SUBST([HAVE_SYS_IOCTL_H])
35 dnl <sys/ioctl.h> is always overridden, because of GNULIB_POSIXCHECK.
36 gl_CHECK_NEXT_HEADERS([sys/ioctl.h])
38 dnl Check for declarations of anything we want to poison if the
39 dnl corresponding gnulib module is not in use.
40 gl_WARN_ON_USE_PREPARE([[#include <sys/ioctl.h>
41 /* Some platforms declare ioctl in the wrong header. */
42 #if !(defined __GLIBC__ && !defined __UCLIBC__)
48 # gl_SYS_IOCTL_MODULE_INDICATOR([modulename])
49 # sets the shell variable that indicates the presence of the given module
50 # to a C preprocessor expression that will evaluate to 1.
51 # This macro invocation must not occur in macros that are AC_REQUIREd.
52 AC_DEFUN([gl_SYS_IOCTL_MODULE_INDICATOR],
54 dnl Ensure to expand the default settings once only.
55 gl_SYS_IOCTL_H_REQUIRE_DEFAULTS
56 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
57 dnl Define it also as a C macro, for the benefit of the unit tests.
58 gl_MODULE_INDICATOR_FOR_TESTS([$1])
61 # Initializes the default values for AC_SUBSTed shell variables.
62 # This macro must not be AC_REQUIREd. It must only be invoked, and only
63 # outside of macros or in macros that are not AC_REQUIREd.
64 AC_DEFUN([gl_SYS_IOCTL_H_REQUIRE_DEFAULTS],
66 m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_IOCTL_H_MODULE_INDICATOR_DEFAULTS], [
67 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_IOCTL])
69 m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_IOCTL_H_MODULE_INDICATOR_DEFAULTS])
70 AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
73 AC_DEFUN([gl_SYS_IOCTL_H_DEFAULTS],
75 dnl Assume proper GNU behavior unless another module says otherwise.
76 SYS_IOCTL_H_HAVE_WINSOCK2_H=0; AC_SUBST([SYS_IOCTL_H_HAVE_WINSOCK2_H])
77 SYS_IOCTL_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS=0;
78 AC_SUBST([SYS_IOCTL_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS])
79 REPLACE_IOCTL=0; AC_SUBST([REPLACE_IOCTL])