sg_io.c

   1 /*
   2  * Copyright (C) 2007-2008 Intel Corporation
   3  *
   4  *      Retrieve drive serial numbers for scsi disks
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19 #include <string.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/sg.h>
  22 #include <sys/ioctl.h>
  23
  24 int scsi_get_serial(int fd, void *buf, size_t buf_len)
  25 {
  26         unsigned char inq_cmd[] = {INQUIRY, 1, 0x80, 0, buf_len, 0};
  27         unsigned char sense[32];
  28         struct sg_io_hdr io_hdr;
  29
  30         memset(&io_hdr, 0, sizeof(io_hdr));
  31         io_hdr.interface_id = 'S';
  32         io_hdr.cmdp = inq_cmd;
  33         io_hdr.cmd_len = sizeof(inq_cmd);
  34         io_hdr.dxferp = buf;
  35         io_hdr.dxfer_len = buf_len;
  36         io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
  37         io_hdr.sbp = sense;
  38         io_hdr.mx_sb_len = sizeof(sense);
  39         io_hdr.timeout = 5000;
  40
  41         return ioctl(fd, SG_IO, &io_hdr);
  42 }