#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <scsi/sg.h>

/* modified file from /usr/share/doc/sg3-utils/examples/sg_simple16.c
 *  * Copyright (C) 2001 D. Gilbert
 *   */

#define READ10_REPLY_LEN 512
#define READ10_CMD_LEN 10

#define EBUFF_SZ 256

int main(int argc, char * argv[])
{
    int sg_fd, k, ok;
    unsigned char r10CmdBlk [READ10_CMD_LEN] =
                {0x28, 0, 0x7f, 0xff, 0xff, 0xff, 0, 0, 1, 0};
    sg_io_hdr_t io_hdr;
    char * file_name = 0;
    char ebuff[EBUFF_SZ];
    unsigned char inBuff[READ10_REPLY_LEN];
    unsigned char sense_buffer[32];

    for (k = 1; k < argc; ++k) {
        if (*argv[k] == '-') {
            printf("Unrecognized switch: %s\n", argv[k]);
            file_name = 0;
            break;
        }
        else if (0 == file_name)
            file_name = argv[k];
        else {
            printf("too many arguments\n");
            file_name = 0;
            break;
        }
    }
    if (0 == file_name) {
        printf("Usage: 'sg_simple10 <sg_device>'\n");
        return 1;
    }

    if ((sg_fd = open(file_name, O_RDWR)) < 0) {
        snprintf(ebuff, EBUFF_SZ,
                 "sg_simple10: error opening file: %s", file_name);
        perror(ebuff);
        return 1;
    }
    /* Prepare READ_10 command */
    memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
    io_hdr.interface_id = 'S';
    io_hdr.cmd_len = sizeof(r10CmdBlk);
    /* io_hdr.iovec_count = 0; */  /* memset takes care of this */
    io_hdr.mx_sb_len = sizeof(sense_buffer);
    io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
    io_hdr.dxfer_len = READ10_REPLY_LEN;
    io_hdr.dxferp = inBuff;
    io_hdr.cmdp = r10CmdBlk;
    io_hdr.sbp = sense_buffer;
    io_hdr.timeout = 20000;     /* 20000 millisecs == 20 seconds */
    /* io_hdr.flags = 0; */     /* take defaults: indirect IO, etc */
    /* io_hdr.pack_id = 0; */
    /* io_hdr.usr_ptr = NULL; */

    if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
        perror("sg_simple10: Inquiry SG_IO ioctl error");
        close(sg_fd);
        return 1;
    }

    printf("READ_10 duration=%u millisecs, resid=%d, msg_status=%d status=%d sense=%d driver_status %x\n",
           io_hdr.duration, io_hdr.resid, (int)io_hdr.msg_status,
           io_hdr.status, sense_buffer[2], io_hdr.driver_status);

    close(sg_fd);
    return 0;
}