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    Contents of /trunk/mkinitrd-magellan/busybox/miscutils/eject.c

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 3157 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * eject implementation for busybox
    4 *
    5 * Copyright (C) 2004 Peter Willis <psyphreak@phreaker.net>
    6 * Copyright (C) 2005 Tito Ragusa <farmatito@tiscali.it>
    7 *
    8 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
    9 */
    10
    11 /*
    12 * This is a simple hack of eject based on something Erik posted in #uclibc.
    13 * Most of the dirty work blatantly ripped off from cat.c =)
    14 */
    15
    16 #include <sys/mount.h>
    17 #include "libbb.h"
    18 /* Must be after libbb.h: they need size_t */
    19 #include "fix_u32.h"
    20 #include <scsi/sg.h>
    21 #include <scsi/scsi.h>
    22
    23 /* various defines swiped from linux/cdrom.h */
    24 #define CDROMCLOSETRAY 0x5319 /* pendant of CDROMEJECT */
    25 #define CDROMEJECT 0x5309 /* Ejects the cdrom media */
    26 #define CDROM_DRIVE_STATUS 0x5326 /* Get tray position, etc. */
    27 /* drive status possibilities returned by CDROM_DRIVE_STATUS ioctl */
    28 #define CDS_TRAY_OPEN 2
    29
    30 #define dev_fd 3
    31
    32 /* Code taken from the original eject (http://eject.sourceforge.net/),
    33 * refactored it a bit for busybox (ne-bb@nicoerfurth.de) */
    34
    35 static void eject_scsi(const char *dev)
    36 {
    37 static const char sg_commands[3][6] = {
    38 { ALLOW_MEDIUM_REMOVAL, 0, 0, 0, 0, 0 },
    39 { START_STOP, 0, 0, 0, 1, 0 },
    40 { START_STOP, 0, 0, 0, 2, 0 }
    41 };
    42
    43 unsigned i;
    44 unsigned char sense_buffer[32];
    45 unsigned char inqBuff[2];
    46 sg_io_hdr_t io_hdr;
    47
    48 if ((ioctl(dev_fd, SG_GET_VERSION_NUM, &i) < 0) || (i < 30000))
    49 bb_error_msg_and_die("not a sg device or old sg driver");
    50
    51 memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
    52 io_hdr.interface_id = 'S';
    53 io_hdr.cmd_len = 6;
    54 io_hdr.mx_sb_len = sizeof(sense_buffer);
    55 io_hdr.dxfer_direction = SG_DXFER_NONE;
    56 /* io_hdr.dxfer_len = 0; */
    57 io_hdr.dxferp = inqBuff;
    58 io_hdr.sbp = sense_buffer;
    59 io_hdr.timeout = 2000;
    60
    61 for (i = 0; i < 3; i++) {
    62 io_hdr.cmdp = (void *)sg_commands[i];
    63 ioctl_or_perror_and_die(dev_fd, SG_IO, (void *)&io_hdr, "%s", dev);
    64 }
    65
    66 /* force kernel to reread partition table when new disc is inserted */
    67 ioctl(dev_fd, BLKRRPART);
    68 }
    69
    70 #define FLAG_CLOSE 1
    71 #define FLAG_SMART 2
    72 #define FLAG_SCSI 4
    73
    74 static void eject_cdrom(unsigned flags, const char *dev)
    75 {
    76 int cmd = CDROMEJECT;
    77
    78 if (flags & FLAG_CLOSE
    79 || ((flags & FLAG_SMART) && ioctl(dev_fd, CDROM_DRIVE_STATUS) == CDS_TRAY_OPEN)
    80 ) {
    81 cmd = CDROMCLOSETRAY;
    82 }
    83
    84 ioctl_or_perror_and_die(dev_fd, cmd, NULL, "%s", dev);
    85 }
    86
    87 int eject_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    88 int eject_main(int argc UNUSED_PARAM, char **argv)
    89 {
    90 unsigned flags;
    91 const char *device;
    92
    93 opt_complementary = "?1:t--T:T--t";
    94 flags = getopt32(argv, "tT" IF_FEATURE_EJECT_SCSI("s"));
    95 device = argv[optind] ? argv[optind] : "/dev/cdrom";
    96
    97 /* We used to do "umount <device>" here, but it was buggy
    98 if something was mounted OVER cdrom and
    99 if cdrom is mounted many times.
    100
    101 This works equally well (or better):
    102 #!/bin/sh
    103 umount /dev/cdrom
    104 eject /dev/cdrom
    105 */
    106
    107 xmove_fd(xopen_nonblocking(device), dev_fd);
    108
    109 if (ENABLE_FEATURE_EJECT_SCSI && (flags & FLAG_SCSI))
    110 eject_scsi(device);
    111 else
    112 eject_cdrom(flags, device);
    113
    114 if (ENABLE_FEATURE_CLEAN_UP)
    115 close(dev_fd);
    116
    117 return EXIT_SUCCESS;
    118 }