cwaitos2.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 73 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/


#include "variety.h"
#include <stddef.h>
#include <process.h>
#define INCL_DOSPROCESS
#define INCL_DOSERRORS
#include <wos2.h>
#include <errno.h>
#include "rtdata.h"
#include "seterrno.h"

_WCRTLINK int cwait( int *status, int process_id, int action )
    {
        APIRET  retcode;
        RESULTCODES rc;
        PID     pid;
        #pragma pack(__push,1);
        union {
            int         stat;
            struct {
                unsigned char al, ah;
            } s;
        } u;
        #pragma pack(__pop);

        retcode = DosCwait( action, 0, &rc, &pid, process_id );
        if( retcode != 0 ) {
            __set_errno( retcode == ERROR_WAIT_NO_CHILDREN ? ECHILD : EINVAL );
            return( -1 );
        } else {
            u.stat = retcode;
            u.s.al = rc.codeTerminate;
            if( u.s.al == 0 )  u.s.ah = rc.codeResult;
            if( status != NULL )  *status = u.stat;
            if( u.s.al != 0 ) {
                __set_errno( EINTR );
                return( -1 );
            }
        }
        return( pid );
    }