type_socklen_t.m4

基于LINUX/UNIX的UPN库,是智能家具的用的底层库.

##### http://autoconf-archive.cryp.to/type_socklen_t.html
#
# SYNOPSIS
#
#   TYPE_SOCKLEN_T
#
# DESCRIPTION
#
#   Check whether sys/socket.h defines type socklen_t. Please note that
#   some systems require sys/types.h to be included before sys/socket.h
#   can be compiled.
#
# LAST MODIFICATION
#
#   2005-01-11
#
# COPYLEFT
#
#   Copyright (c) 2005 Lars Brinkhoff <[e-mail]>
#
#   This program is free software; you can redistribute it and/or
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#
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#   General Public License for more details.
#
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#   along with this program; if not, write to the Free Software
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#   02111-1307, USA.
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AC_DEFUN([TYPE_SOCKLEN_T],
[AC_CACHE_CHECK([for socklen_t], ac_cv_type_socklen_t,
[
  AC_TRY_COMPILE(
  [#include <sys/types.h>
   #include <sys/socket.h>],
  [socklen_t len = 42; return 0;],
  ac_cv_type_socklen_t=yes,
  ac_cv_type_socklen_t=no)
])
  if test $ac_cv_type_socklen_t != yes; then
    AC_DEFINE(socklen_t, int, [Substitute for socklen_t])
  fi
])