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Annotation of Gnu-Mach/i386/dos/dos_seek.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Copyright (c) 1995-1994 The University of Utah and
        !             3:  * the Computer Systems Laboratory at the University of Utah (CSL).
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Permission to use, copy, modify and distribute this software is hereby
        !             7:  * granted provided that (1) source code retains these copyright, permission,
        !             8:  * and disclaimer notices, and (2) redistributions including binaries
        !             9:  * reproduce the notices in supporting documentation, and (3) all advertising
        !            10:  * materials mentioning features or use of this software display the following
        !            11:  * acknowledgement: ``This product includes software developed by the
        !            12:  * Computer Systems Laboratory at the University of Utah.''
        !            13:  *
        !            14:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
        !            15:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
        !            16:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            17:  *
        !            18:  * CSL requests users of this software to return to [email protected] any
        !            19:  * improvements that they make and grant CSL redistribution rights.
        !            20:  *
        !            21:  *      Author: Bryan Ford, University of Utah CSL
        !            22:  */
        !            23: 
        !            24: #include <unistd.h>
        !            25: #include <errno.h>
        !            26: 
        !            27: #include "dos_io.h"
        !            28: 
        !            29: int dos_seek(dos_fd_t fd, vm_offset_t offset, int whence, vm_offset_t *out_newpos)
        !            30: {
        !            31:        struct real_call_data real_call_data;
        !            32:        int err;
        !            33: 
        !            34:        dos_init_rcd(&real_call_data);
        !            35:        real_call_data.eax = 0x4200 | whence;
        !            36:        real_call_data.ebx = fd;
        !            37:        real_call_data.ecx = (unsigned)offset >> 16;
        !            38:        real_call_data.edx = (unsigned)offset & 0xffff;
        !            39:        real_int(0x21, &real_call_data);
        !            40:        if (err = dos_check_err(&real_call_data))
        !            41:                return err;
        !            42:        *out_newpos = (real_call_data.edx << 16) | (real_call_data.eax & 0xffff);
        !            43:        return 0;
        !            44: }
        !            45: 

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