Contents of /trunk/mkinitrd-magellan/busybox/miscutils/eject.c
Parent Directory | Revision Log
Revision 984 -
(show annotations)
(download)
Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 3157 byte(s)
Sun May 30 11:32:42 2010 UTC (14 years, 4 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 | } |