# close.m4 serial 9

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.

AC_DEFUN([gl_FUNC_CLOSE],

[

  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])

  m4_ifdef([gl_MSVC_INVAL], [

    AC_REQUIRE([gl_MSVC_INVAL])

    if test $HAVE_MSVC_INVALID_PARAMETER_HANDLER = 1; then

      REPLACE_CLOSE=1

    fi

  ])

  m4_ifdef([gl_PREREQ_SYS_H_WINSOCK2], [

    gl_PREREQ_SYS_H_WINSOCK2

    if test $UNISTD_H_HAVE_WINSOCK2_H = 1; then

      dnl Even if the 'socket' module is not used here, another part of the

      dnl application may use it and pass file descriptors that refer to

      dnl sockets to the close() function. So enable the support for sockets.

      REPLACE_CLOSE=1

    fi

  ])

  dnl Replace close() for supporting the gnulib-defined fchdir() function,

  dnl to keep fchdir's bookkeeping up-to-date.

  m4_ifdef([gl_FUNC_FCHDIR], [

    if test $REPLACE_CLOSE = 0; then

      gl_TEST_FCHDIR

      if test $HAVE_FCHDIR = 0; then

        REPLACE_CLOSE=1

      fi

    fi

  ])

])