1 # sys_ioctl_h.m4 serial 15
2 dnl Copyright (C) 2008-2021 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 dnl Written by Bruno Haible.
9 AC_DEFUN_ONCE([gl_SYS_IOCTL_H],
11 dnl Ensure to expand the default settings once only, before all statements
12 dnl that occur in other macros.
13 AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
15 AC_CHECK_HEADERS_ONCE([sys/ioctl.h])
16 if test $ac_cv_header_sys_ioctl_h = yes; then
18 dnl Test whether <sys/ioctl.h> declares ioctl(), or whether some other
19 dnl header file, such as <unistd.h> or <stropts.h>, is needed for that.
20 AC_CACHE_CHECK([whether <sys/ioctl.h> declares ioctl],
21 [gl_cv_decl_ioctl_in_sys_ioctl_h],
22 [dnl We cannot use AC_CHECK_DECL because it produces its own messages.
25 [[#include <sys/ioctl.h>]],
27 [gl_cv_decl_ioctl_in_sys_ioctl_h=yes],
28 [gl_cv_decl_ioctl_in_sys_ioctl_h=no])
33 AC_SUBST([HAVE_SYS_IOCTL_H])
34 dnl <sys/ioctl.h> is always overridden, because of GNULIB_POSIXCHECK.
35 gl_CHECK_NEXT_HEADERS([sys/ioctl.h])
37 dnl Check for declarations of anything we want to poison if the
38 dnl corresponding gnulib module is not in use.
39 gl_WARN_ON_USE_PREPARE([[#include <sys/ioctl.h>
40 /* Some platforms declare ioctl in the wrong header. */
41 #if !(defined __GLIBC__ && !defined __UCLIBC__)
47 # gl_SYS_IOCTL_MODULE_INDICATOR([modulename])
48 # sets the shell variable that indicates the presence of the given module
49 # to a C preprocessor expression that will evaluate to 1.
50 # This macro invocation must not occur in macros that are AC_REQUIREd.
51 AC_DEFUN([gl_SYS_IOCTL_MODULE_INDICATOR],
53 dnl Ensure to expand the default settings once only.
54 gl_SYS_IOCTL_H_REQUIRE_DEFAULTS
55 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
56 dnl Define it also as a C macro, for the benefit of the unit tests.
57 gl_MODULE_INDICATOR_FOR_TESTS([$1])
60 # Initializes the default values for AC_SUBSTed shell variables.
61 # This macro must not be AC_REQUIREd. It must only be invoked, and only
62 # outside of macros or in macros that are not AC_REQUIREd.
63 AC_DEFUN([gl_SYS_IOCTL_H_REQUIRE_DEFAULTS],
65 m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_IOCTL_H_MODULE_INDICATOR_DEFAULTS], [
66 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_IOCTL])
68 m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_IOCTL_H_MODULE_INDICATOR_DEFAULTS])
69 AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
72 AC_DEFUN([gl_SYS_IOCTL_H_DEFAULTS],
74 dnl Assume proper GNU behavior unless another module says otherwise.
75 SYS_IOCTL_H_HAVE_WINSOCK2_H=0; AC_SUBST([SYS_IOCTL_H_HAVE_WINSOCK2_H])
76 SYS_IOCTL_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS=0;
77 AC_SUBST([SYS_IOCTL_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS])
78 REPLACE_IOCTL=0; AC_SUBST([REPLACE_IOCTL])