1 /* vi: set sw=4 ts=4: */
3 * eject implementation for busybox
5 * Copyright (C) 2004 Peter Willis <psyphreak@phreaker.net>
6 * Copyright (C) 2005 Tito Ragusa <farmatito@tiscali.it>
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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 =)
16 //usage:#define eject_trivial_usage
17 //usage: "[-t] [-T] [DEVICE]"
18 //usage:#define eject_full_usage "\n\n"
19 //usage: "Eject DEVICE or default /dev/cdrom\n"
20 //usage: IF_FEATURE_EJECT_SCSI(
21 //usage: "\n -s SCSI device"
23 //usage: "\n -t Close tray"
24 //usage: "\n -T Open/close tray (toggle)"
26 #include <sys/mount.h>
28 #if ENABLE_FEATURE_EJECT_SCSI
29 /* Must be after libbb.h: they need size_t */
32 # include <scsi/scsi.h>
37 /* Code taken from the original eject (http://eject.sourceforge.net/),
38 * refactored it a bit for busybox (ne-bb@nicoerfurth.de) */
40 #if ENABLE_FEATURE_EJECT_SCSI
41 static void eject_scsi(const char *dev)
43 static const char sg_commands[3][6] ALIGN1 = {
44 { ALLOW_MEDIUM_REMOVAL, 0, 0, 0, 0, 0 },
45 { START_STOP, 0, 0, 0, 1, 0 },
46 { START_STOP, 0, 0, 0, 2, 0 }
50 unsigned char sense_buffer[32];
51 unsigned char inqBuff[2];
54 if ((ioctl(dev_fd, SG_GET_VERSION_NUM, &i) < 0) || (i < 30000))
55 bb_error_msg_and_die("not a sg device or old sg driver");
57 memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
58 io_hdr.interface_id = 'S';
60 io_hdr.mx_sb_len = sizeof(sense_buffer);
61 io_hdr.dxfer_direction = SG_DXFER_NONE;
62 /* io_hdr.dxfer_len = 0; */
63 io_hdr.dxferp = inqBuff;
64 io_hdr.sbp = sense_buffer;
65 io_hdr.timeout = 2000;
67 for (i = 0; i < 3; i++) {
68 io_hdr.cmdp = (void *)sg_commands[i];
69 ioctl_or_perror_and_die(dev_fd, SG_IO, (void *)&io_hdr, "%s", dev);
72 /* force kernel to reread partition table when new disc is inserted */
73 ioctl(dev_fd, BLKRRPART);
76 # define eject_scsi(dev) ((void)0)
79 /* various defines swiped from linux/cdrom.h */
80 #define CDROMCLOSETRAY 0x5319 /* pendant of CDROMEJECT */
81 #define CDROMEJECT 0x5309 /* Ejects the cdrom media */
82 #define CDROM_DRIVE_STATUS 0x5326 /* Get tray position, etc. */
83 /* drive status possibilities returned by CDROM_DRIVE_STATUS ioctl */
84 #define CDS_TRAY_OPEN 2
90 static void eject_cdrom(unsigned flags, const char *dev)
94 if (flags & FLAG_CLOSE
95 || ((flags & FLAG_SMART) && ioctl(dev_fd, CDROM_DRIVE_STATUS) == CDS_TRAY_OPEN)
100 ioctl_or_perror_and_die(dev_fd, cmd, NULL, "%s", dev);
103 int eject_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
104 int eject_main(int argc UNUSED_PARAM, char **argv)
109 opt_complementary = "?1:t--T:T--t";
110 flags = getopt32(argv, "tT" IF_FEATURE_EJECT_SCSI("s"));
111 device = argv[optind] ? argv[optind] : "/dev/cdrom";
113 /* We used to do "umount <device>" here, but it was buggy
114 if something was mounted OVER cdrom and
115 if cdrom is mounted many times.
117 This works equally well (or better):
123 xmove_fd(xopen_nonblocking(device), dev_fd);
125 if (ENABLE_FEATURE_EJECT_SCSI && (flags & FLAG_SCSI))
128 eject_cdrom(flags, device);
130 if (ENABLE_FEATURE_CLEAN_UP)