1# close.m4 serial 9
2dnl Copyright (C) 2008-2020 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7AC_DEFUN([gl_FUNC_CLOSE],
8[
9  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
10  m4_ifdef([gl_MSVC_INVAL], [
11    AC_REQUIRE([gl_MSVC_INVAL])
12    if test $HAVE_MSVC_INVALID_PARAMETER_HANDLER = 1; then
13      REPLACE_CLOSE=1
14    fi
15  ])
16  m4_ifdef([gl_PREREQ_SYS_H_WINSOCK2], [
17    gl_PREREQ_SYS_H_WINSOCK2
18    if test $UNISTD_H_HAVE_WINSOCK2_H = 1; then
19      dnl Even if the 'socket' module is not used here, another part of the
20      dnl application may use it and pass file descriptors that refer to
21      dnl sockets to the close() function. So enable the support for sockets.
22      REPLACE_CLOSE=1
23    fi
24  ])
25  dnl Replace close() for supporting the gnulib-defined fchdir() function,
26  dnl to keep fchdir's bookkeeping up-to-date.
27  m4_ifdef([gl_FUNC_FCHDIR], [
28    if test $REPLACE_CLOSE = 0; then
29      gl_TEST_FCHDIR
30      if test $HAVE_FCHDIR = 0; then
31        REPLACE_CLOSE=1
32      fi
33    fi
34  ])
35])
36