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 //config: bool "eject"
18 //config: select PLATFORM_LINUX
20 //config: Used to eject cdroms. (defaults to /dev/cdrom)
22 //config:config FEATURE_EJECT_SCSI
23 //config: bool "SCSI support"
25 //config: depends on EJECT
27 //config: Add the -s option to eject, this allows to eject SCSI-Devices and
28 //config: usb-storage devices.
30 //applet:IF_EJECT(APPLET(eject, BB_DIR_USR_BIN, BB_SUID_DROP))
32 //kbuild:lib-$(CONFIG_EJECT) += eject.o
34 //usage:#define eject_trivial_usage
35 //usage: "[-t] [-T] [DEVICE]"
36 //usage:#define eject_full_usage "\n\n"
37 //usage: "Eject DEVICE or default /dev/cdrom\n"
38 //usage: IF_FEATURE_EJECT_SCSI(
39 //usage: "\n -s SCSI device"
41 //usage: "\n -t Close tray"
42 //usage: "\n -T Open/close tray (toggle)"
44 #include <sys/mount.h>
46 #if ENABLE_FEATURE_EJECT_SCSI
47 /* Must be after libbb.h: they need size_t */
50 # include <scsi/scsi.h>
55 /* Code taken from the original eject (http://eject.sourceforge.net/),
56 * refactored it a bit for busybox (ne-bb@nicoerfurth.de) */
58 #if ENABLE_FEATURE_EJECT_SCSI
59 static void eject_scsi(const char *dev)
61 static const char sg_commands[3][6] ALIGN1 = {
62 { ALLOW_MEDIUM_REMOVAL, 0, 0, 0, 0, 0 },
63 { START_STOP, 0, 0, 0, 1, 0 },
64 { START_STOP, 0, 0, 0, 2, 0 }
68 unsigned char sense_buffer[32];
69 unsigned char inqBuff[2];
72 if ((ioctl(dev_fd, SG_GET_VERSION_NUM, &i) < 0) || (i < 30000))
73 bb_error_msg_and_die("not a sg device or old sg driver");
75 memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
76 io_hdr.interface_id = 'S';
78 io_hdr.mx_sb_len = sizeof(sense_buffer);
79 io_hdr.dxfer_direction = SG_DXFER_NONE;
80 /* io_hdr.dxfer_len = 0; */
81 io_hdr.dxferp = inqBuff;
82 io_hdr.sbp = sense_buffer;
83 io_hdr.timeout = 2000;
85 for (i = 0; i < 3; i++) {
86 io_hdr.cmdp = (void *)sg_commands[i];
87 ioctl_or_perror_and_die(dev_fd, SG_IO, (void *)&io_hdr, "%s", dev);
90 /* force kernel to reread partition table when new disc is inserted */
91 ioctl(dev_fd, BLKRRPART);
94 # define eject_scsi(dev) ((void)0)
97 /* various defines swiped from linux/cdrom.h */
98 #define CDROMCLOSETRAY 0x5319 /* pendant of CDROMEJECT */
99 #define CDROMEJECT 0x5309 /* Ejects the cdrom media */
100 #define CDROM_DRIVE_STATUS 0x5326 /* Get tray position, etc. */
101 /* drive status possibilities returned by CDROM_DRIVE_STATUS ioctl */
102 #define CDS_TRAY_OPEN 2
108 static void eject_cdrom(unsigned flags, const char *dev)
110 int cmd = CDROMEJECT;
112 if (flags & FLAG_CLOSE
113 || ((flags & FLAG_SMART) && ioctl(dev_fd, CDROM_DRIVE_STATUS) == CDS_TRAY_OPEN)
115 cmd = CDROMCLOSETRAY;
118 ioctl_or_perror_and_die(dev_fd, cmd, NULL, "%s", dev);
121 int eject_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
122 int eject_main(int argc UNUSED_PARAM, char **argv)
127 opt_complementary = "?1:t--T:T--t";
128 flags = getopt32(argv, "tT" IF_FEATURE_EJECT_SCSI("s"));
129 device = argv[optind] ? argv[optind] : "/dev/cdrom";
131 /* We used to do "umount <device>" here, but it was buggy
132 if something was mounted OVER cdrom and
133 if cdrom is mounted many times.
135 This works equally well (or better):
141 xmove_fd(xopen_nonblocking(device), dev_fd);
143 if (ENABLE_FEATURE_EJECT_SCSI && (flags & FLAG_SCSI))
146 eject_cdrom(flags, device);
148 if (ENABLE_FEATURE_CLEAN_UP)