| # sys_ioctl_h.m4 serial 15 |
| dnl Copyright (C) 2008-2021 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]) |
| ]) |