release/src/router/scsi-idle/scsi-start.c

   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.h>
  29 #include <scsi/scsi_ioctl.h>
  30 #include <scsi/sg.h>
  31
  32 #ifdef SCSI_DISK0_MAJOR
  33 #define IS_SCSI_DISK(rdev)      SCSI_DISK_MAJOR(MAJOR(rdev))
  34 #else
  35 #define IS_SCSI_DISK(rdev)      (MAJOR(rdev)==SCSI_DISK_MAJOR)
  36 #endif
  37
  38 int main(int argc, char *argv[])
  39 {
  40         int fd, mode;
  41         struct stat statbuf;
  42
  43         mode = argv[0][strlen(argv[0])-1];
  44         if(mode=='p' || mode=='P')  {
  45                 mode = 0;       /* stoP */
  46         } else if(mode=='t' || mode=='T')  {
  47                 mode = 1;       /* starT */
  48         } else {
  49                 fprintf(stderr, "Try ending the executable name with 'stop' or 'start'\n");
  50                 exit(1);
  51         }
  52
  53         if (argc != 2) {
  54                 fprintf(stderr, "Usage: %s device\n",argv[0]);
  55                 fprintf(stderr, "%s the device's motor\n", mode?"Starts":"Stops");
  56                 exit(1);
  57         }
  58         if ((stat(argv[1], &statbuf)) < 0) {
  59                 perror(argv[1]);
  60                 exit(1);
  61         }
  62         if (!S_ISBLK(statbuf.st_mode)
  63                 || !IS_SCSI_DISK(statbuf.st_rdev) )  {
  64                 fprintf(stderr, "%s is not a SCSI block device\n", argv[1]);
  65                 exit(1);
  66         }
  67         if ((fd = open(argv[1], O_RDWR)) < 0) {
  68                 perror(argv[1]);
  69                 exit(1);
  70         }
  71
  72 #ifdef SCSI_SG
  73         char sg_command[] = { START_STOP, 0, 0, 0, 0 /* mode */, 0 };
  74         sg_io_hdr_t io_hdr;
  75
  76         sg_command[4] = (char)mode;
  77         memset(&io_hdr, 0, sizeof(io_hdr));
  78         io_hdr.interface_id = 'S';
  79         io_hdr.dxfer_direction = SG_DXFER_NONE;
  80         io_hdr.cmd_len = sizeof(sg_command);
  81         io_hdr.cmdp = sg_command;
  82         io_hdr.timeout = 60 * 1000; /* 1 min */
  83
  84         if (ioctl(fd, SG_IO, &io_hdr) < 0) {
  85 #else
  86         if (ioctl(fd, mode?SCSI_IOCTL_START_UNIT:SCSI_IOCTL_STOP_UNIT) < 0) {
  87 #endif
  88                 perror(argv[1]);
  89                 close(fd);
  90                 exit(1);
  91         }
  92
  93         close(fd);
  94         exit(0);
  95 }