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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include "sg_lib.h"
#include "sg_cmds_basic.h"
/*
* Copyright (C) 1999-2006 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.
Since this code has been used in the past to form the backbone of
some Linux apps based on the "sg" device driver, it has been
strengthened.
Start/Stop parameter by Kurt Garloff <garloff at suse dot de>, 6/2000
Sync cache parameter by Kurt Garloff <garloff at suse dot de>, 1/2001
Guard block device answering sg's ioctls.
<dgilbert at interlog dot com> 12/2002
Convert to SG_IO ioctl so can use sg or block devices in 2.6.* 3/2003
*/
static char * version_str = "0.51 20061016";
void usage ()
{
fprintf(stderr, "Usage: sg_start [0] [1] [--eject] [--fl=<n>] "
"[-i] [--imm=0|1]\n"
" [--load] [--loej] [--pc=<n>] [--start] "
"[--stop] [-v] [-V]\n"
"< device>\n"
" where:\n"
" 0 stop unit (e.g. spin down a disk or a "
"cd/dvd)\n"
" 1 start unit (e.g. spin up a disk or a "
"cd/dvd)\n"
" --eject stop then eject the medium\n"
" --fl=<n> format layer number (mmc5)\n"
" -i return immediately (same as '--imm=1')\n"
" --imm=0|1 0->await completion(def), 1->return "
"immediately\n"
" --load load then start the medium\n"
" --loej load the medium if '-start' option is "
"also given\n"
" or stop unit and eject\n"
" --pc=<n> power conditions (in hex, default 0 -> no "
"power condition)\n"
" 1 -> active, 2 -> idle, 3 -> standby, "
"5 -> sleep (MMC)\n"
" --start start unit (same as '1'), default "
"action\n"
" --stop stop unit (same as '0')\n"
" -v verbose (print out SCSI commands)\n"
" -V print version string then exit\n\n"
" Example: 'sg_start --stop /dev/sdb' stops unit\n"
" 'sg_start --eject /dev/scd0' stops unit and "
"ejects medium\n\n"
"Performs a START STOP UNIT SCSI command\n"
);
exit (1);
}
int main(int argc, char * argv[])
{
int startstop = -1;
const char * file_name = 0;
const char * cp;
int k, fd, num, res, plen, jmp_out;
unsigned int u;
int ambigu = 0;
int immed = 0;
int loej = 0;
int fl_num = -1;
int power_conds = 0;
int verbose = 0;
int ret = 0;
for (k = 1; k < argc; ++k) {
cp = argv[k];
plen = strlen(cp);
if (plen <= 0)
continue;
if ('-' == *cp) {
for (--plen, ++cp, jmp_out = 0; plen > 0;
--plen, ++cp) {
switch (*cp) {
case 'i':
if ('\0' == *(cp + 1))
immed = 1;
else
jmp_out = 1;
break;
case 'v':
++verbose;
break;
case 'V':
fprintf(stderr, "Version string: "
"%s\n", version_str);
exit(0);
case '?':
usage();
return 0;
case '-':
++cp;
--plen;
jmp_out = 1;
break;
default:
jmp_out = 1;
break;
}
if (jmp_out)
break;
}
if (plen <= 0)
continue;
if (0 == strncmp(cp, "eject", 5)) {
loej = 1;
if (startstop == 1)
ambigu = 1;
else
startstop = 0;
} else if (0 == strncmp("fl=", cp, 3)) {
num = sscanf(cp + 3, "%x", &u);
if (1 != num) {
fprintf(stderr, "Bad value after "
"'fl=' option\n");
usage();
return SG_LIB_SYNTAX_ERROR;
}
fl_num = u;
} else if (0 == strncmp("imm=", cp, 4)) {
num = sscanf(cp + 4, "%x", &u);
if ((1 != num) || (u > 1)) {
fprintf(stderr, "Bad value after "
"'imm=' option\n");
usage();
return SG_LIB_SYNTAX_ERROR;
}
immed = u;
} else if (0 == strncmp(cp, "load", 4)) {
loej = 1;
if (startstop == 0)
ambigu = 1;
else
startstop = 1;
} else if (0 == strncmp(cp, "loej", 4))
loej = 1;
else if (0 == strncmp("pc=", cp, 3)) {
num = sscanf(cp + 3, "%x", &u);
if ((1 != num) || (u > 15)) {
fprintf(stderr, "Bad value after "
"after 'pc=' option\n");
usage();
return SG_LIB_SYNTAX_ERROR;
}
power_conds = u;
} else if (0 == strncmp(cp, "start", 5)) {
if (startstop == 0)
ambigu = 1;
else
startstop = 1;
} else if (0 == strncmp(cp, "stop", 4)) {
if (startstop == 1)
ambigu = 1;
else
startstop = 0;
} else if (jmp_out) {
fprintf(stderr, "Unrecognized option: %s\n",
cp);
usage();
return SG_LIB_SYNTAX_ERROR;
}
} else if (0 == strcmp("0", cp)) {
if (startstop >= 0)
ambigu = 1;
else
startstop = 0;
} else if (0 == strcmp("1", cp)) {
if (startstop >= 0)
ambigu = 1;
else
startstop = 1;
} else if (0 == file_name)
file_name = cp;
else {
fprintf(stderr, "too many arguments, got: %s, not "
"expecting: %s\n", file_name, cp);
usage();
return SG_LIB_SYNTAX_ERROR;
}
if (ambigu) {
fprintf(stderr, "please, only one of 0, 1, --eject, "
"--load, --start or --stop\n");
usage();
return SG_LIB_SYNTAX_ERROR;
}
}
if (0 == file_name) {
fprintf(stderr, "No <scsi_device> argument given\n");
usage();
return SG_LIB_SYNTAX_ERROR;
}
if (fl_num >= 0) {
if (startstop == 0) {
fprintf(stderr, "Giving '--fl=<n>' and '--stop' (or "
"'--eject') is invalid\n");
usage();
return SG_LIB_SYNTAX_ERROR;
}
if (power_conds > 0) {
fprintf(stderr, "Giving '--fl=<n>' and '--pc=<n>' "
"when <n> is non-zero is invalid\n");
usage();
return SG_LIB_SYNTAX_ERROR;
}
} else {
if ((startstop == -1) && loej)
startstop = 0;
if ((startstop == -1) && (0 == power_conds))
startstop = 1;
}
fd = sg_cmds_open_device(file_name, 0 /* rw */, verbose);
if (fd < 0) {
fprintf(stderr, "Error trying to open %s: %s\n",
file_name, safe_strerror(-fd));
return SG_LIB_FILE_ERROR;
}
res = 0;
if (fl_num >= 0)
res = sg_ll_start_stop_unit(fd, immed, fl_num, power_conds,
1 /* fl */, 1 /* loej */,
1 /*start */, 1 /* noisy */,
verbose);
else if (power_conds > 0)
res = sg_ll_start_stop_unit(fd, immed, 0, power_conds, 0, 0,
0, 1, verbose);
else if (startstop != -1)
res = sg_ll_start_stop_unit(fd, immed, 0, 0, 0, loej,
startstop, 1, verbose);
ret = res;
if (res) {
if (verbose < 2) {
if (SG_LIB_CAT_INVALID_OP == res)
fprintf(stderr, "command not supported\n");
else if (SG_LIB_CAT_NOT_READY == res)
fprintf(stderr, "device not ready\n");
else if (SG_LIB_CAT_UNIT_ATTENTION == res)
fprintf(stderr, "unit attention\n");
else if (SG_LIB_CAT_ABORTED_COMMAND == res)
fprintf(stderr, "aborted command\n");
else if (SG_LIB_CAT_ILLEGAL_REQ == res)
fprintf(stderr, "invalid field in cdb\n");
}
fprintf(stderr, "START STOP UNIT command failed\n");
}
res = sg_cmds_close_device(fd);
if ((res < 0) && (0 == ret))
return SG_LIB_FILE_ERROR;
return (ret >= 0) ? ret : SG_LIB_CAT_OTHER;
}
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