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"
21 //usage: IF_FEATURE_EJECT_SCSI(
22 //usage: "\n -s SCSI device"
24 //usage: "\n -t Close tray"
25 //usage: "\n -T Open/close tray (toggle)"
27 #include <sys/mount.h>
29 /* Must be after libbb.h: they need size_t */
32 #include <scsi/scsi.h>
34 /* various defines swiped from linux/cdrom.h */
35 #define CDROMCLOSETRAY 0x5319 /* pendant of CDROMEJECT */
36 #define CDROMEJECT 0x5309 /* Ejects the cdrom media */
37 #define CDROM_DRIVE_STATUS 0x5326 /* Get tray position, etc. */
38 /* drive status possibilities returned by CDROM_DRIVE_STATUS ioctl */
39 #define CDS_TRAY_OPEN 2
43 /* Code taken from the original eject (http://eject.sourceforge.net/),
44 * refactored it a bit for busybox (ne-bb@nicoerfurth.de) */
46 static void eject_scsi(const char *dev)
48 static const char sg_commands[3][6] = {
49 { ALLOW_MEDIUM_REMOVAL, 0, 0, 0, 0, 0 },
50 { START_STOP, 0, 0, 0, 1, 0 },
51 { START_STOP, 0, 0, 0, 2, 0 }
55 unsigned char sense_buffer[32];
56 unsigned char inqBuff[2];
59 if ((ioctl(dev_fd, SG_GET_VERSION_NUM, &i) < 0) || (i < 30000))
60 bb_error_msg_and_die("not a sg device or old sg driver");
62 memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
63 io_hdr.interface_id = 'S';
65 io_hdr.mx_sb_len = sizeof(sense_buffer);
66 io_hdr.dxfer_direction = SG_DXFER_NONE;
67 /* io_hdr.dxfer_len = 0; */
68 io_hdr.dxferp = inqBuff;
69 io_hdr.sbp = sense_buffer;
70 io_hdr.timeout = 2000;
72 for (i = 0; i < 3; i++) {
73 io_hdr.cmdp = (void *)sg_commands[i];
74 ioctl_or_perror_and_die(dev_fd, SG_IO, (void *)&io_hdr, "%s", dev);
77 /* force kernel to reread partition table when new disc is inserted */
78 ioctl(dev_fd, BLKRRPART);
85 static void eject_cdrom(unsigned flags, const char *dev)
89 if (flags & FLAG_CLOSE
90 || ((flags & FLAG_SMART) && ioctl(dev_fd, CDROM_DRIVE_STATUS) == CDS_TRAY_OPEN)
95 ioctl_or_perror_and_die(dev_fd, cmd, NULL, "%s", dev);
98 int eject_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
99 int eject_main(int argc UNUSED_PARAM, char **argv)
104 opt_complementary = "?1:t--T:T--t";
105 flags = getopt32(argv, "tT" IF_FEATURE_EJECT_SCSI("s"));
106 device = argv[optind] ? argv[optind] : "/dev/cdrom";
108 /* We used to do "umount <device>" here, but it was buggy
109 if something was mounted OVER cdrom and
110 if cdrom is mounted many times.
112 This works equally well (or better):
118 xmove_fd(xopen_nonblocking(device), dev_fd);
120 if (ENABLE_FEATURE_EJECT_SCSI && (flags & FLAG_SCSI))
123 eject_cdrom(flags, device);
125 if (ENABLE_FEATURE_CLEAN_UP)