| 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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