dupwnt.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
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*  ========================================================================
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*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


#include "variety.h"
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <windows.h>
#include "iomode.h"
#include "rtcheck.h"
#include "seterrno.h"

_WCRTLINK int dup( int old_hid )
{
    HANDLE      new_handle=(HANDLE)-1;
    int         hid;
    HANDLE      cprocess;

    __handle_check( old_hid, -1 );

    // First try to get the required slot.
    // No point in creating a new handle only to not use it.  JBS 99/11/01
    hid = __allocPOSIXHandle( DUMMY_HANDLE );
    if( hid == -1 ) {
        return( -1 );
    }

    cprocess = GetCurrentProcess();

    if( DuplicateHandle( cprocess,  __getOSHandle( old_hid ), cprocess,
                        &new_handle, 0, TRUE, DUPLICATE_SAME_ACCESS ) ) {
        // Now use the slot we got
        __setOSHandle( hid, new_handle );   // JBS 99/11/01
        __SetIOMode( hid, __GetIOMode( old_hid ) );
    } else {
        __set_errno_nt();
        // Give back the slot we got
        __freePOSIXHandle( hid );
        hid = -1;
    }

    return( hid );
}