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 the GPL v2 or later, see the file LICENSE in this tarball.
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 #include <sys/mount.h>
18 /* Must be after libbb.h: they need size_t */
20 #include <scsi/scsi.h>
22 /* various defines swiped from linux/cdrom.h */
23 #define CDROMCLOSETRAY 0x5319 /* pendant of CDROMEJECT */
24 #define CDROMEJECT 0x5309 /* Ejects the cdrom media */
25 #define CDROM_DRIVE_STATUS 0x5326 /* Get tray position, etc. */
26 /* drive status possibilities returned by CDROM_DRIVE_STATUS ioctl */
27 #define CDS_TRAY_OPEN 2
31 /* Code taken from the original eject (http://eject.sourceforge.net/),
32 * refactored it a bit for busybox (ne-bb@nicoerfurth.de) */
34 static void eject_scsi(const char *dev)
36 static const char sg_commands[3][6] = {
37 { ALLOW_MEDIUM_REMOVAL, 0, 0, 0, 0, 0 },
38 { START_STOP, 0, 0, 0, 1, 0 },
39 { START_STOP, 0, 0, 0, 2, 0 }
43 unsigned char sense_buffer[32];
44 unsigned char inqBuff[2];
47 if ((ioctl(dev_fd, SG_GET_VERSION_NUM, &i) < 0) || (i < 30000))
48 bb_error_msg_and_die("not a sg device or old sg driver");
50 memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
51 io_hdr.interface_id = 'S';
53 io_hdr.mx_sb_len = sizeof(sense_buffer);
54 io_hdr.dxfer_direction = SG_DXFER_NONE;
55 /* io_hdr.dxfer_len = 0; */
56 io_hdr.dxferp = inqBuff;
57 io_hdr.sbp = sense_buffer;
58 io_hdr.timeout = 2000;
60 for (i = 0; i < 3; i++) {
61 io_hdr.cmdp = (void *)sg_commands[i];
62 ioctl_or_perror_and_die(dev_fd, SG_IO, (void *)&io_hdr, "%s", dev);
65 /* force kernel to reread partition table when new disc is inserted */
66 ioctl(dev_fd, BLKRRPART);
73 static void eject_cdrom(unsigned flags, const char *dev)
77 if (flags & FLAG_CLOSE
78 || (flags & FLAG_SMART && ioctl(dev_fd, CDROM_DRIVE_STATUS) == CDS_TRAY_OPEN)
83 ioctl_or_perror_and_die(dev_fd, cmd, NULL, "%s", dev);
86 int eject_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
87 int eject_main(int argc UNUSED_PARAM, char **argv)
92 opt_complementary = "?1:t--T:T--t";
93 flags = getopt32(argv, "tT" IF_FEATURE_EJECT_SCSI("s"));
94 device = argv[optind] ? argv[optind] : "/dev/cdrom";
96 /* We used to do "umount <device>" here, but it was buggy
97 if something was mounted OVER cdrom and
98 if cdrom is mounted many times.
100 This works equally well (or better):
106 xmove_fd(xopen_nonblocking(device), dev_fd);
108 if (ENABLE_FEATURE_EJECT_SCSI && (flags & FLAG_SCSI))
111 eject_cdrom(flags, device);
113 if (ENABLE_FEATURE_CLEAN_UP)