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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 <sys/time.h>
#include "sg_include.h"
#include "sg_lib.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) 2000-2004 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.
*/
static char * version_str = "3.12 20041011";
#define TUR_CMD_LEN 6
#define EBUFF_SZ 256
int main(int argc, char * argv[])
{
int sg_fd, k;
unsigned char turCmdBlk [TUR_CMD_LEN] =
{0x00, 0, 0, 0, 0, 0};
struct sg_io_hdr io_hdr;
char * file_name = 0;
char ebuff[EBUFF_SZ];
unsigned char sense_buffer[32];
int num_turs = 1;
int num_errs = 0;
int do_time = 0;
int verbose = 0;
struct timeval start_tm, end_tm;
for (k = 1; k < argc; ++k) {
if (0 == strncmp("-n=", argv[k], 3)) {
num_turs = sg_get_num(argv[k] + 3);
if (num_turs < 0) {
printf("Couldn't decode number after '-n' switch\n");
file_name = 0;
break;
}
}
else if (0 == strcmp("-t", argv[k]))
do_time = 1;
else if (0 == strcmp("-v", argv[k]))
++verbose;
else if (0 == strcmp("-V", argv[k])) {
fprintf(stderr, "Version string: %s\n", version_str);
exit(0);
} 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 [-t] [-n=<num_of_test_unit_readys>] "
"<sg_device>'\n"
" where '-n=<num>' number of test_unit_ready commands "
"(def: 1)\n"
" can take k, K, m, M postfix multipliers\n"
" '-t' outputs total duration and commands per "
"second\n"
" '-v' increase verbosity\n"
" '-V' print version string then exit\n");
return 1;
}
if ((sg_fd = open(file_name, O_RDONLY)) < 0) {
snprintf(ebuff, EBUFF_SZ,
"sg_turs: error opening file: %s", file_name);
perror(ebuff);
return 1;
}
/* Prepare TEST UNIT READY command */
memset(&io_hdr, 0, sizeof(struct sg_io_hdr));
io_hdr.interface_id = 'S';
io_hdr.cmd_len = sizeof(turCmdBlk);
io_hdr.mx_sb_len = sizeof(sense_buffer);
io_hdr.dxfer_direction = SG_DXFER_NONE;
io_hdr.cmdp = turCmdBlk;
io_hdr.sbp = sense_buffer;
io_hdr.timeout = 20000; /* 20000 millisecs == 20 seconds */
if (verbose) {
fprintf(stderr, " Test unit ready cmd: ");
for (k = 0; k < TUR_CMD_LEN; ++k)
fprintf(stderr, "%02x ", turCmdBlk[k]);
fprintf(stderr, "\n");
}
if (do_time) {
start_tm.tv_sec = 0;
start_tm.tv_usec = 0;
gettimeofday(&start_tm, NULL);
}
for (k = 0; k < num_turs; ++k) {
io_hdr.pack_id = k;
if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
perror("sg_turs: Test Unit Ready SG_IO ioctl error");
close(sg_fd);
return 1;
}
if (io_hdr.info & SG_INFO_OK_MASK) {
++num_errs;
if (1 == num_turs) { /* then print out the error message */
if (SG_LIB_CAT_CLEAN != sg_err_category3(&io_hdr))
sg_chk_n_print3("tur", &io_hdr);
}
}
}
if ((do_time) && (start_tm.tv_sec || start_tm.tv_usec)) {
struct timeval res_tm;
double a, b;
gettimeofday(&end_tm, NULL);
res_tm.tv_sec = end_tm.tv_sec - start_tm.tv_sec;
res_tm.tv_usec = end_tm.tv_usec - start_tm.tv_usec;
if (res_tm.tv_usec < 0) {
--res_tm.tv_sec;
res_tm.tv_usec += 1000000;
}
a = res_tm.tv_sec;
a += (0.000001 * res_tm.tv_usec);
b = (double)num_turs;
printf("time to perform commands was %d.%06d secs",
(int)res_tm.tv_sec, (int)res_tm.tv_usec);
if (a > 0.00001)
printf("; %.2f operations/sec\n", b / a);
else
printf("\n");
}
printf("Completed %d Test Unit Ready commands with %d errors\n",
num_turs, num_errs);
close(sg_fd);
return 0;
}
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