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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"
/* This is a program that periodically executes a TEST UNIT READY
SCSI command using the SCSI generic (sg) driver.
* Copyright (C) 2001 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_hold [-t<secs>] [-d] <sg_device>
Version 1.00 (20010312)
6 byte TEST UNIT READY command:
[0x00][ |lu][res ][res ][res ][res ]
*/
#define TUR_CMD_LEN 6
int main(int argc, char * argv[])
{
int sg_fd, k, j, res;
unsigned char turCmdBlk [TUR_CMD_LEN] =
{0x00, 0, 0, 0, 0, 0};
sg_io_hdr_t io_hdr;
char * file_name = 0;
char ebuff[128];
unsigned char sense_buffer[32];
int sleep_period = 1;
int debug = 0;
size_t len;
for (k = 1; k < argc; ++k) {
if (0 == memcmp("-t", argv[k], 2)) {
len = strlen(argv[k]);
if (len > 2)
res = sscanf(argv[k] + 2, "%d", &sleep_period);
else if (++k < argc)
res = sscanf(argv[k], "%d", &sleep_period);
else
res = 0;
if ((1 != res) || (sleep_period < 1)) {
file_name = 0;
printf("Bad '-t' argument\n");
break;
}
}
else if (0 == memcmp("-d", argv[k], 2))
debug = 1;
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) {
printf("Usage: 'sg_hold [-t<secs>] [-d] <sg_device>'\n");
printf(" where: -t<secs> time in seconds between TURs "
"(default: 1 sec)\n");
printf(" -d output message with each TUR\n");
return 1;
}
if ((sg_fd = open(file_name, O_RDONLY)) < 0) {
sprintf(ebuff, "sg_hold: 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_hold: %s doesn't seem to be an new sg device\n",
file_name);
close(sg_fd);
return 1;
}
for (j = 1; ; ++j) {
/* Prepare TEST UNIT READY command */
memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
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 */
io_hdr.pack_id = j; /* marching pack_id starting at 1 */
if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
perror("sg_hold: Test Unit Ready SG_IO ioctl error");
close(sg_fd);
return 1;
}
/* now for the error processing */
if ((io_hdr.info & SG_INFO_OK_MASK) != SG_INFO_OK) {
if (io_hdr.sb_len_wr > 0) {
printf("TEST UNIT READY sense data: ");
for (k = 0; k < io_hdr.sb_len_wr; ++k) {
if ((k > 0) && (0 == (k % 10)))
printf("\n ");
printf("0x%02x ", sense_buffer[k]);
}
printf("\n");
}
else if (io_hdr.masked_status)
printf("TEST UNIT READY SCSI status=0x%x\n", io_hdr.status);
else if (io_hdr.host_status)
printf("TEST UNIT READY host_status=0x%x\n",
io_hdr.host_status);
else if (io_hdr.driver_status)
printf("TEST UNIT READY driver_status=0x%x\n",
io_hdr.driver_status);
else
printf("TEST UNIT READY unexpected error\n");
printf("Test Unit Ready failed so unit may _not_ be ready!\n");
}
else if (debug)
printf("Test Unit Ready successful so unit is ready!\n");
sleep(sleep_period);
}
close(sg_fd);
return 0;
}
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