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#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 "sg_include.h"
#include "sg_err.h"
/* This is a simple program executing a SCSI INQUIRY command and a
TEST UNIT READY command using the SCSI generic (sg) driver
There is another variant of this program called "sg_simple2"
which does not include the sg_err.h header and logic and so has
simpler but more primitive error processing.
* Copyright (C) 1999 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_simple1 <sg_device>
Version 0.53 (991007)
6 byte INQUIRY command:
[0x12][ |lu][pg cde][res ][al len][cntrl ]
6 byte TEST UNIT READY command:
[0x00][ |lu][res ][res ][res ][res ]
*/
#define OFF sizeof(struct sg_header)
#define INQ_REPLY_LEN 96 /* logic assumes >= sizeof(inqCmdBlk) */
#define INQ_CMD_LEN 6
#define TUR_CMD_LEN 6
#define INQ_PACK_ID 1234
#define TUR_PACK_ID 1235
int main(int argc, char * argv[])
{
int sg_fd, k, ok;
unsigned char inqCmdBlk [INQ_CMD_LEN] =
{0x12, 0, 0, 0, INQ_REPLY_LEN, 0};
unsigned char turCmdBlk [TUR_CMD_LEN] =
{0x00, 0, 0, 0, 0, 0};
unsigned char inqBuff[OFF + INQ_REPLY_LEN];
unsigned char * turBuff = inqBuff; /* Use same buffer */
int inqInLen = OFF + sizeof(inqCmdBlk);
int turInLen = OFF + sizeof(turCmdBlk);
int inqOutLen = OFF + INQ_REPLY_LEN;
unsigned char * buffp = inqBuff + OFF;
struct sg_header * sghp = (struct sg_header *)inqBuff;
char * file_name = 0;
char ebuff[128];
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_simple1 <sg_device>'\n");
return 1;
}
if ((sg_fd = open(file_name, O_RDWR)) < 0) {
sprintf(ebuff, "sg_simple1: error opening file: %s", file_name);
perror(ebuff);
return 1;
}
/* Just to be safe, check we have a sg device by trying an ioctl */
if (ioctl(sg_fd, SG_GET_TIMEOUT, 0) < 0) {
printf("sg_simple1: %s doesn't seem to be an sg device\n", file_name);
close(sg_fd);
return 1;
}
/* Prepare for INQUIRY command */
sghp->reply_len = inqOutLen;
sghp->pack_id = INQ_PACK_ID;
sghp->twelve_byte = 0;
sghp->other_flags = 0; /* some apps assume this is done ?!? */
memcpy(inqBuff + OFF, inqCmdBlk, INQ_CMD_LEN);
/* Send for INQUIRY command */
if (write(sg_fd, inqBuff, inqInLen) < 0) {
perror("sg_simple1: Inquiry write error");
close(sg_fd);
return 1;
}
/* Read back status (sense_buffer) and data */
if (read(sg_fd, inqBuff, inqOutLen) < 0) {
perror("sg_simple1: Inquiry read error");
close(sg_fd);
return 1;
}
if (INQ_PACK_ID != sghp->pack_id) /* this shouldn't happen */
printf("Inquiry pack_id mismatch, wanted=%d, got=%d\n",
INQ_PACK_ID, sghp->pack_id);
/* now for the error processing */
ok = 0;
switch (sg_err_category(sghp->target_status, sghp->host_status,
sghp->driver_status, sghp->sense_buffer, SG_MAX_SENSE)) {
case SG_ERR_CAT_CLEAN:
ok = 1;
break;
case SG_ERR_CAT_RECOVERED:
printf("Recovered error on INQUIRY, continuing\n");
ok = 1;
break;
default: /* won't bother decoding other categories */
sg_chk_n_print("INQUIRY command error", sghp->target_status,
sghp->host_status, sghp->driver_status,
sghp->sense_buffer, SG_MAX_SENSE);
break;
}
if (ok) { /* output result if it is available */
int f = (int)*(buffp + 7);
printf("Some of the INQUIRY command's results:\n");
printf(" %.8s %.16s %.4s ", buffp + 8, buffp + 16, buffp + 32);
printf("[wide=%d sync=%d cmdque=%d sftre=%d]\n",
!!(f & 0x20), !!(f & 0x10), !!(f & 2), !!(f & 1));
}
/* Prepare for TEST UNIT READY command */
sghp->reply_len = OFF;
sghp->pack_id = TUR_PACK_ID;
sghp->twelve_byte = 0;
sghp->other_flags = 0; /* some apps assume this is done ?!? */
memcpy(turBuff + OFF, turCmdBlk, TUR_CMD_LEN);
/* Send TEST UNIT READY command */
if (write(sg_fd, turBuff, turInLen) < 0) {
perror("sg_simple1: Test Unit Ready write error");
close(sg_fd);
return 1;
}
/* Read back status (sense_buffer) */
if (read(sg_fd, turBuff, OFF) < 0) {
perror("sg_simple1: Test Unit Ready read error");
close(sg_fd);
return 1;
}
if (TUR_PACK_ID != sghp->pack_id) /* this shouldn't happen */
printf("Test Unit Ready pack_id mismatch, wanted=%d, got=%d\n",
TUR_PACK_ID, sghp->pack_id);
/* now for the error processing */
ok = 0;
switch (sg_err_category(sghp->target_status, sghp->host_status,
sghp->driver_status, sghp->sense_buffer, SG_MAX_SENSE)) {
case SG_ERR_CAT_CLEAN:
ok = 1;
break;
case SG_ERR_CAT_RECOVERED:
printf("Recovered error on Test Unit Ready, continuing\n");
ok = 1;
break;
default: /* won't bother decoding other categories */
sg_chk_n_print("Test Unit Ready command error", sghp->target_status,
sghp->host_status, sghp->driver_status,
sghp->sense_buffer, SG_MAX_SENSE);
break;
}
if (ok)
printf("Test Unit Ready successful so unit is ready!\n");
else
printf("Test Unit Ready failed so unit may _not_ be ready!\n");
close(sg_fd);
return 0;
}
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