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# sys_ioctl_h.m4 serial 15
dnl Copyright (C) 2008-2024 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_SYS_IOCTL_H],
[
dnl Ensure to expand the default settings once only, before all statements
dnl that occur in other macros.
AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
AC_CHECK_HEADERS_ONCE([sys/ioctl.h])
if test $ac_cv_header_sys_ioctl_h = yes; then
HAVE_SYS_IOCTL_H=1
dnl Test whether <sys/ioctl.h> declares ioctl(), or whether some other
dnl header file, such as <unistd.h> or <stropts.h>, is needed for that.
AC_CACHE_CHECK([whether <sys/ioctl.h> declares ioctl],
[gl_cv_decl_ioctl_in_sys_ioctl_h],
[dnl We cannot use AC_CHECK_DECL because it produces its own messages.
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/ioctl.h>]],
[[(void) ioctl;]])],
[gl_cv_decl_ioctl_in_sys_ioctl_h=yes],
[gl_cv_decl_ioctl_in_sys_ioctl_h=no])
])
else
HAVE_SYS_IOCTL_H=0
fi
AC_SUBST([HAVE_SYS_IOCTL_H])
dnl <sys/ioctl.h> is always overridden, because of GNULIB_POSIXCHECK.
gl_CHECK_NEXT_HEADERS([sys/ioctl.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 <sys/ioctl.h>
/* Some platforms declare ioctl in the wrong header. */
#if !(defined __GLIBC__ && !defined __UCLIBC__)
# include <unistd.h>
#endif
]], [ioctl])
])
# gl_SYS_IOCTL_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_SYS_IOCTL_MODULE_INDICATOR],
[
dnl Ensure to expand the default settings once only.
gl_SYS_IOCTL_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_SYS_IOCTL_H_REQUIRE_DEFAULTS],
[
m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_IOCTL_H_MODULE_INDICATOR_DEFAULTS], [
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_IOCTL])
])
m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_IOCTL_H_MODULE_INDICATOR_DEFAULTS])
AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
])
AC_DEFUN([gl_SYS_IOCTL_H_DEFAULTS],
[
dnl Assume proper GNU behavior unless another module says otherwise.
SYS_IOCTL_H_HAVE_WINSOCK2_H=0; AC_SUBST([SYS_IOCTL_H_HAVE_WINSOCK2_H])
SYS_IOCTL_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS=0;
AC_SUBST([SYS_IOCTL_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS])
REPLACE_IOCTL=0; AC_SUBST([REPLACE_IOCTL])
])
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