1/* scsi-start / scsi-stop
2 * Copyright (C) 1999 Trent Piepho <xyzzy@speakeasy.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19#include <fcntl.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <unistd.h>
24#include <sys/ioctl.h>
25#include <sys/stat.h>
26#include <linux/major.h>
27#include <linux/kdev_t.h>
28#include <scsi/scsi_ioctl.h>
29#include <scsi/sg.h>
30
31#ifdef SCSI_DISK0_MAJOR
32#define IS_SCSI_DISK(rdev)	SCSI_DISK_MAJOR(MAJOR(rdev))
33#else
34#define IS_SCSI_DISK(rdev)	(MAJOR(rdev)==SCSI_DISK_MAJOR)
35#endif
36
37#ifndef START_STOP
38#define START_STOP            0x1b
39#endif
40
41int main(int argc, char *argv[])
42{
43	int fd, mode;
44	struct stat statbuf;
45
46	mode = argv[0][strlen(argv[0])-1];
47	if(mode=='p' || mode=='P')  {
48		mode = 0;	/* stoP */
49	} else if(mode=='t' || mode=='T')  {
50		mode = 1;	/* starT */
51	} else {
52		fprintf(stderr, "Try ending the executable name with 'stop' or 'start'\n");
53		exit(1);
54	}
55
56	if (argc != 2) {
57		fprintf(stderr, "Usage: %s device\n",argv[0]);
58		fprintf(stderr, "%s the device's motor\n", mode?"Starts":"Stops");
59		exit(1);
60	}
61	if ((stat(argv[1], &statbuf)) < 0) {
62		perror(argv[1]);
63		exit(1);
64	}
65	if (!S_ISBLK(statbuf.st_mode)
66		|| !IS_SCSI_DISK(statbuf.st_rdev) )  {
67		fprintf(stderr, "%s is not a SCSI block device\n", argv[1]);
68		exit(1);
69	}
70	if ((fd = open(argv[1], O_RDWR)) < 0) {
71		perror(argv[1]);
72		exit(1);
73	}
74
75#ifdef SCSI_SG
76	char sg_command[] = { START_STOP, 0, 0, 0, 0 /* mode */, 0 };
77	sg_io_hdr_t io_hdr;
78
79	sg_command[4] = (char)mode;
80	memset(&io_hdr, 0, sizeof(io_hdr));
81	io_hdr.interface_id = 'S';
82	io_hdr.dxfer_direction = SG_DXFER_NONE;
83	io_hdr.cmd_len = sizeof(sg_command);
84	io_hdr.cmdp = sg_command;
85	io_hdr.timeout = 60 * 1000; /* 1 min */
86
87	if (ioctl(fd, SG_IO, &io_hdr) < 0) {
88#else
89	if (ioctl(fd, mode?SCSI_IOCTL_START_UNIT:SCSI_IOCTL_STOP_UNIT) < 0) {
90#endif
91		perror(argv[1]);
92		close(fd);
93		exit(1);
94	}
95
96	close(fd);
97	exit(0);
98}
99