1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * eject implementation for busybox
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4 | *
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5 | * Copyright (C) 2004 Peter Willis <psyphreak@phreaker.net>
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6 | * Copyright (C) 2005 Tito Ragusa <farmatito@tiscali.it>
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7 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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9 | */
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10 |
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11 | /*
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12 | * This is a simple hack of eject based on something Erik posted in #uclibc.
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13 | * Most of the dirty work blatantly ripped off from cat.c =)
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14 | */
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15 |
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16 | #include <sys/mount.h>
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17 | #include "libbb.h"
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18 | /* Must be after libbb.h: they need size_t */
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19 | #include "fix_u32.h"
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20 | #include <scsi/sg.h>
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21 | #include <scsi/scsi.h>
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22 |
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23 | /* various defines swiped from linux/cdrom.h */
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24 | #define CDROMCLOSETRAY 0x5319 /* pendant of CDROMEJECT */
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25 | #define CDROMEJECT 0x5309 /* Ejects the cdrom media */
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26 | #define CDROM_DRIVE_STATUS 0x5326 /* Get tray position, etc. */
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27 | /* drive status possibilities returned by CDROM_DRIVE_STATUS ioctl */
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28 | #define CDS_TRAY_OPEN 2
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29 |
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30 | #define dev_fd 3
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31 |
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32 | /* Code taken from the original eject (http://eject.sourceforge.net/),
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33 | * refactored it a bit for busybox (ne-bb@nicoerfurth.de) */
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34 |
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35 | static void eject_scsi(const char *dev)
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36 | {
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37 | static const char sg_commands[3][6] = {
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38 | { ALLOW_MEDIUM_REMOVAL, 0, 0, 0, 0, 0 },
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39 | { START_STOP, 0, 0, 0, 1, 0 },
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40 | { START_STOP, 0, 0, 0, 2, 0 }
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41 | };
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42 |
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43 | unsigned i;
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44 | unsigned char sense_buffer[32];
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45 | unsigned char inqBuff[2];
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46 | sg_io_hdr_t io_hdr;
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47 |
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48 | if ((ioctl(dev_fd, SG_GET_VERSION_NUM, &i) < 0) || (i < 30000))
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49 | bb_error_msg_and_die("not a sg device or old sg driver");
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50 |
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51 | memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
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52 | io_hdr.interface_id = 'S';
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53 | io_hdr.cmd_len = 6;
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54 | io_hdr.mx_sb_len = sizeof(sense_buffer);
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55 | io_hdr.dxfer_direction = SG_DXFER_NONE;
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56 | /* io_hdr.dxfer_len = 0; */
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57 | io_hdr.dxferp = inqBuff;
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58 | io_hdr.sbp = sense_buffer;
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59 | io_hdr.timeout = 2000;
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60 |
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61 | for (i = 0; i < 3; i++) {
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62 | io_hdr.cmdp = (void *)sg_commands[i];
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63 | ioctl_or_perror_and_die(dev_fd, SG_IO, (void *)&io_hdr, "%s", dev);
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64 | }
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65 |
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66 | /* force kernel to reread partition table when new disc is inserted */
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67 | ioctl(dev_fd, BLKRRPART);
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68 | }
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69 |
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70 | #define FLAG_CLOSE 1
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71 | #define FLAG_SMART 2
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72 | #define FLAG_SCSI 4
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73 |
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74 | static void eject_cdrom(unsigned flags, const char *dev)
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75 | {
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76 | int cmd = CDROMEJECT;
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77 |
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78 | if (flags & FLAG_CLOSE
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79 | || ((flags & FLAG_SMART) && ioctl(dev_fd, CDROM_DRIVE_STATUS) == CDS_TRAY_OPEN)
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80 | ) {
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81 | cmd = CDROMCLOSETRAY;
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82 | }
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83 |
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84 | ioctl_or_perror_and_die(dev_fd, cmd, NULL, "%s", dev);
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85 | }
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86 |
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87 | int eject_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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88 | int eject_main(int argc UNUSED_PARAM, char **argv)
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89 | {
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90 | unsigned flags;
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91 | const char *device;
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92 |
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93 | opt_complementary = "?1:t--T:T--t";
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94 | flags = getopt32(argv, "tT" IF_FEATURE_EJECT_SCSI("s"));
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95 | device = argv[optind] ? argv[optind] : "/dev/cdrom";
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96 |
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97 | /* We used to do "umount <device>" here, but it was buggy
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98 | if something was mounted OVER cdrom and
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99 | if cdrom is mounted many times.
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100 |
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101 | This works equally well (or better):
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102 | #!/bin/sh
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103 | umount /dev/cdrom
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104 | eject /dev/cdrom
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105 | */
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106 |
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107 | xmove_fd(xopen_nonblocking(device), dev_fd);
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108 |
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109 | if (ENABLE_FEATURE_EJECT_SCSI && (flags & FLAG_SCSI))
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110 | eject_scsi(device);
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111 | else
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112 | eject_cdrom(flags, device);
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113 |
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114 | if (ENABLE_FEATURE_CLEAN_UP)
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115 | close(dev_fd);
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116 |
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117 | return EXIT_SUCCESS;
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118 | }
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