FreeBSD/Linux Kernel Cross Reference
sys/sys/_posix.h

     #ifndef _SYS__POSIX_H_
     #define _SYS__POSIX_H_
     
     /*-
      * Copyright (c) 1998 HD Associates, Inc.
      * All rights reserved.
      * contact: dufault@hda.com
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    /*
     * This is a stand alone header file to set up for feature specification
     * defined to take place before the inclusion of any standard header.
     * It should only handle pre-processor defines.
     *
     * See section B.2.7 of 1003.1b-1993 
     *
     */
    
    #ifdef _KERNEL
    
    #if !defined(KLD_MODULE)
    #include "opt_posix.h"
    #endif
    
    /* Only kern_mib.c uses _POSIX_VERSION.  Introduce a kernel
     * one to avoid other pieces of the kernel getting dependant
     * on that.
     * XXX Complain if you think this dumb.
     */
    
    /* Make P1003 structures visible for the kernel if
     * the P1003_1B option is in effect.
     */
    #ifdef P1003_1B
    #define _P1003_1B_VISIBLE
    #ifndef _KPOSIX_VERSION
    #define _KPOSIX_VERSION         199309L
    #endif
    #endif
    
    #ifndef _KPOSIX_VERSION
    #define _KPOSIX_VERSION         199009L
    #endif
    
    #define _P1003_1B_VISIBLE_HISTORICALLY
    
    #else
    
    /* Default to existing user space version.
     */
    #ifndef _POSIX_VERSION
    #define _POSIX_VERSION          199009L
    #endif
    
    /* Test for visibility of P1003.1B features:
     * If _POSIX_SOURCE and POSIX_C_SOURCE are completely undefined
     * they show up.
     *
     * If they specify a version including P1003.1B then they show up.
     *
     * (Two macros are added to permit hiding new extensions while 
     * keeping historic BSD features - that is not done now)
     *
     */
    
    #if (!defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)) || \
     (_POSIX_VERSION  >= 199309L && defined(_POSIX_C_SOURCE) && \
      _POSIX_C_SOURCE >= 199309L)
    #define _P1003_1B_VISIBLE
    #define _P1003_1B_VISIBLE_HISTORICALLY
    #endif
    
    #endif /* _KERNEL */
    #endif /* _SYS__POSIX_H_ */

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