| 1 | # sys_ioctl_h.m4 serial 15
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| 2 | dnl Copyright (C) 2008-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl Written by Bruno Haible.
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| 8 |
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| 9 | AC_DEFUN_ONCE([gl_SYS_IOCTL_H],
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| 10 | [
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| 11 | dnl Ensure to expand the default settings once only, before all statements
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| 12 | dnl that occur in other macros.
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| 13 | AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
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| 14 |
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| 15 | AC_CHECK_HEADERS_ONCE([sys/ioctl.h])
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| 16 | if test $ac_cv_header_sys_ioctl_h = yes; then
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| 17 | HAVE_SYS_IOCTL_H=1
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| 18 | dnl Test whether <sys/ioctl.h> declares ioctl(), or whether some other
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| 19 | dnl header file, such as <unistd.h> or <stropts.h>, is needed for that.
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| 20 | AC_CACHE_CHECK([whether <sys/ioctl.h> declares ioctl],
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| 21 | [gl_cv_decl_ioctl_in_sys_ioctl_h],
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| 22 | [dnl We cannot use AC_CHECK_DECL because it produces its own messages.
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| 23 | AC_COMPILE_IFELSE(
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| 24 | [AC_LANG_PROGRAM(
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| 25 | [[#include <sys/ioctl.h>]],
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| 26 | [[(void) ioctl;]])],
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| 27 | [gl_cv_decl_ioctl_in_sys_ioctl_h=yes],
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| 28 | [gl_cv_decl_ioctl_in_sys_ioctl_h=no])
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| 29 | ])
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| 30 | else
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| 31 | HAVE_SYS_IOCTL_H=0
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| 32 | fi
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| 33 | AC_SUBST([HAVE_SYS_IOCTL_H])
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| 34 | dnl <sys/ioctl.h> is always overridden, because of GNULIB_POSIXCHECK.
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| 35 | gl_CHECK_NEXT_HEADERS([sys/ioctl.h])
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| 36 |
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| 37 | dnl Check for declarations of anything we want to poison if the
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| 38 | dnl corresponding gnulib module is not in use.
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| 39 | gl_WARN_ON_USE_PREPARE([[#include <sys/ioctl.h>
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| 40 | /* Some platforms declare ioctl in the wrong header. */
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| 41 | #if !(defined __GLIBC__ && !defined __UCLIBC__)
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| 42 | # include <unistd.h>
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| 43 | #endif
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| 44 | ]], [ioctl])
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| 45 | ])
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| 46 |
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| 47 | # gl_SYS_IOCTL_MODULE_INDICATOR([modulename])
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| 48 | # sets the shell variable that indicates the presence of the given module
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| 49 | # to a C preprocessor expression that will evaluate to 1.
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| 50 | # This macro invocation must not occur in macros that are AC_REQUIREd.
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| 51 | AC_DEFUN([gl_SYS_IOCTL_MODULE_INDICATOR],
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| 52 | [
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| 53 | dnl Ensure to expand the default settings once only.
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| 54 | gl_SYS_IOCTL_H_REQUIRE_DEFAULTS
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| 55 | gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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| 56 | dnl Define it also as a C macro, for the benefit of the unit tests.
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| 57 | gl_MODULE_INDICATOR_FOR_TESTS([$1])
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| 58 | ])
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| 59 |
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| 60 | # Initializes the default values for AC_SUBSTed shell variables.
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| 61 | # This macro must not be AC_REQUIREd. It must only be invoked, and only
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| 62 | # outside of macros or in macros that are not AC_REQUIREd.
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| 63 | AC_DEFUN([gl_SYS_IOCTL_H_REQUIRE_DEFAULTS],
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| 64 | [
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| 65 | m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_IOCTL_H_MODULE_INDICATOR_DEFAULTS], [
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| 66 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_IOCTL])
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| 67 | ])
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| 68 | m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_IOCTL_H_MODULE_INDICATOR_DEFAULTS])
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| 69 | AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
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| 70 | ])
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| 71 |
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| 72 | AC_DEFUN([gl_SYS_IOCTL_H_DEFAULTS],
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| 73 | [
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| 74 | dnl Assume proper GNU behavior unless another module says otherwise.
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| 75 | SYS_IOCTL_H_HAVE_WINSOCK2_H=0; AC_SUBST([SYS_IOCTL_H_HAVE_WINSOCK2_H])
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| 76 | SYS_IOCTL_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS=0;
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| 77 | AC_SUBST([SYS_IOCTL_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS])
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| 78 | REPLACE_IOCTL=0; AC_SUBST([REPLACE_IOCTL])
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| 79 | ])
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