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#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "sg_lib.h"
#include "sg_io_linux.h"
/* This program performs a READ_16 command as scsi mid-level support
16 byte commands from lk 2.4.15
* Copyright (C) 2001-2018 D. Gilbert
* 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, or (at your option)
* any later version.
Invocation: sg_simple16 <scsi_device>
Version 1.04 (20180218)
*/
#define READ16_REPLY_LEN 512
#define READ16_CMD_LEN 16
#define EBUFF_SZ 256
int main(int argc, char * argv[])
{
int sg_fd, k, ok;
uint8_t r16_cdb [READ16_CMD_LEN] =
{0x88, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0};
sg_io_hdr_t io_hdr;
char * file_name = 0;
char ebuff[EBUFF_SZ];
uint8_t inBuff[READ16_REPLY_LEN];
uint8_t 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_simple16 <sg_device>'\n");
return 1;
}
if ((sg_fd = open(file_name, O_RDWR)) < 0) {
snprintf(ebuff, EBUFF_SZ,
"sg_simple16: error opening file: %s", file_name);
perror(ebuff);
return 1;
}
/* Just to be safe, check we have a new sg device by trying an ioctl */
if ((ioctl(sg_fd, SG_GET_VERSION_NUM, &k) < 0) || (k < 30000)) {
printf("sg_simple16: %s doesn't seem to be an new sg device\n",
file_name);
close(sg_fd);
return 1;
}
/* Prepare READ_16 command */
memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
io_hdr.interface_id = 'S';
io_hdr.cmd_len = sizeof(r16_cdb);
/* 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 = READ16_REPLY_LEN;
io_hdr.dxferp = inBuff;
io_hdr.cmdp = r16_cdb;
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_simple16: Inquiry SG_IO ioctl error");
close(sg_fd);
return 1;
}
/* now for the error processing */
ok = 0;
switch (sg_err_category3(&io_hdr)) {
case SG_LIB_CAT_CLEAN:
ok = 1;
break;
case SG_LIB_CAT_RECOVERED:
printf("Recovered error on READ_16, continuing\n");
ok = 1;
break;
default: /* won't bother decoding other categories */
sg_chk_n_print3("READ_16 command error", &io_hdr, 1);
break;
}
if (ok) { /* output result if it is available */
printf("READ_16 duration=%u millisecs, resid=%d, msg_status=%d\n",
io_hdr.duration, io_hdr.resid, (int)io_hdr.msg_status);
}
close(sg_fd);
return 0;
}
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