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#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "sg_include.h"
/* This program sends a user specified number of TEST UNIT READY commands
to the given sg device. Since TUR is a simple command involing no
data transfer (and no REQUEST SENSE command iff the unit is ready)
then this can be used for timing per SCSI command overheads.
* Copyright (C) 2000 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_turs -n=<number_of_turs> <sg_device>
The value give to "-n=" can have the following multipliers:
'c','C' *1 'b','B' *512 'k' *1024 'K' *1000
'm' *(1024^2) 'M' *(1000^2) 'g' *(1024^3) 'G' *(1000^3)
Version 02.03 (20001208)
6 byte TEST UNIT READY command:
[0x00][ |lu][res ][res ][res ][res ]
*/
#define OFF sizeof(struct sg_header)
#define TUR_CMD_LEN 6
int get_num(char * buf)
{
int res, num;
char c;
res = sscanf(buf, "%d%c", &num, &c);
if (0 == res)
return -1;
else if (1 == res)
return num;
else {
switch (c) {
case 'c':
case 'C':
return num;
case 'b':
case 'B':
return num * 512;
case 'k':
return num * 1024;
case 'K':
return num * 1000;
case 'm':
return num * 1024 * 1024;
case 'M':
return num * 1000000;
case 'g':
return num * 1024 * 1024 * 1024;
case 'G':
return num * 1000000000;
default:
fprintf(stderr, "unrecognized multiplier\n");
return -1;
}
}
}
int main(int argc, char * argv[])
{
int sg_fd, k;
unsigned char turCmdBlk [TUR_CMD_LEN] =
{0x00, 0, 0, 0, 0, 0};
unsigned char turBuff[OFF + TUR_CMD_LEN];
int turInLen = sizeof(turBuff);
struct sg_header * sghp = (struct sg_header *)turBuff;
char * file_name = 0;
char ebuff[128];
int num_turs = 0;
int num_errs = 0;
for (k = 1; k < argc; ++k) {
if (0 == strncmp("-n=", argv[k], 3)) {
num_turs = get_num(argv[k] + 3);
if (num_turs < 0) {
printf("Couldn't decode number after '-n' switch\n");
file_name = 0;
break;
}
}
else 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) || (num_turs <= 0)) {
printf("Usage: 'sg_turs -n=<num_of_test_unit_readys> <sg_device>'\n");
return 1;
}
if ((sg_fd = open(file_name, O_RDWR)) < 0) {
sprintf(ebuff, "sg_turs: 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_turs: %s doesn't seem to be an sg device\n", file_name);
close(sg_fd);
return 1;
}
/* Prepare TEST UNIT READY command */
sghp->reply_len = OFF;
sghp->twelve_byte = 0;
sghp->other_flags = 0; /* some apps assume this is done ?!? */
sghp->sense_buffer[0] = 0; /* only needed for old sg driver */
memcpy(turBuff + OFF, turCmdBlk, TUR_CMD_LEN);
for (k = 0; k < num_turs; ++k) {
/* Send TEST UNIT READY command */
sghp->pack_id = k;
if (write(sg_fd, turBuff, turInLen) < 0) {
perror("sg_turs: write error");
close(sg_fd);
return 1;
}
/* Read back status (sense_buffer) */
if (read(sg_fd, turBuff, OFF) < 0) {
perror("sg_turs: read error");
close(sg_fd);
return 1;
}
if (k != sghp->pack_id) /* this shouldn't happen */
printf("Test Unit Ready pack_id mismatch, wanted=%d, got=%d\n",
k, sghp->pack_id);
if (0 != sghp->sense_buffer[0])
++num_errs;
}
printf("Completed %d Test Unit Ready commands with %d errors\n",
num_turs, num_errs);
close(sg_fd);
return 0;
}
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