m4/subpipe.m4

   1 # -*- Autoconf -*-
   2 # Checks required to run `subpipe'.
   3 #
   4 # Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 # 02111-1307  USA
  20
  21 # Written by Paul Eggert <eggert@twinsun.com>.
  22
  23 AC_DEFUN([BISON_PREREQ_SUBPIPE],
  24 [
  25  AC_TYPE_PID_T
  26  AC_CHECK_HEADERS([fcntl.h])
  27  AC_HEADER_SYS_WAIT
  28  AC_CHECK_FUNCS(dup2 waitpid)
  29  AC_FUNC_FORK
  30 ])