sc_mode_select10.c

对SCSI设备 直接存取的通用库

/*
  sc_mode_select10 -- select device specific settings
  Copyright (C) 1996 Dieter Baron and Armin Obersteiner

  This file is part of libscsi, a library for direct scsi device access
  The authors can be contacted at
	<[e-mail]>
	<[e-mail]>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <scsi/all.h>



int
sc_mode_select10(SCSI *fd, int pf, int sp, u_short len, u_char *data)
{
    static unsigned char cmd[10] = { 0x55 };
    u_short s;
    int result;

    cmd[1] = (pf ? 0x8 : 0) | (sp ? 0x1 : 0);
    sc_store_s(cmd+7, len);

    s = *(u_short *)data;
    sc_store_s(data, s);
    s = *(u_short *)(data+6);
    s = s*8;
    sc_store_s(data+6, s);
        
    result=sc_send(fd, SC_READ, 10, cmd, len, data);

    sc_fetch_s(s, data);
    *(u_short *)data = s;
    sc_fetch_s(s, data+6);
    s = s/8;
    *(u_short *)(data+6) = s;
        
    return result;
}