# sys_ioctl_h.m4 serial 10

dnl Copyright (C) 2008-2020 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([gl_SYS_IOCTL_H],

[

  dnl Use AC_REQUIRE here, so that the default behavior below is expanded

  dnl once only, before all statements 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(

            [AC_INCLUDES_DEFAULT([#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])

])

AC_DEFUN([gl_SYS_IOCTL_MODULE_INDICATOR],

[

  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.

  AC_REQUIRE([gl_SYS_IOCTL_H_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])

])

AC_DEFUN([gl_SYS_IOCTL_H_DEFAULTS],

[

  GNULIB_IOCTL=0;         AC_SUBST([GNULIB_IOCTL])

  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])

])