Contents of /tags/mkinitrd-6_1_3/busybox/miscutils/eject.c
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Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
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File size: 3076 byte(s)
Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 3076 byte(s)
tagged 'mkinitrd-6_1_3'
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 "libbb.h" |
17 | |
18 | /* various defines swiped from linux/cdrom.h */ |
19 | #define CDROMCLOSETRAY 0x5319 /* pendant of CDROMEJECT */ |
20 | #define CDROMEJECT 0x5309 /* Ejects the cdrom media */ |
21 | #define CDROM_DRIVE_STATUS 0x5326 /* Get tray position, etc. */ |
22 | /* drive status possibilities returned by CDROM_DRIVE_STATUS ioctl */ |
23 | #define CDS_TRAY_OPEN 2 |
24 | |
25 | #define dev_fd 3 |
26 | |
27 | /* Code taken from the original eject (http://eject.sourceforge.net/), |
28 | * refactored it a bit for busybox (ne-bb@nicoerfurth.de) */ |
29 | |
30 | #include <scsi/sg.h> |
31 | #include <scsi/scsi.h> |
32 | |
33 | static void eject_scsi(const char *dev) |
34 | { |
35 | static const char sg_commands[3][6] = { |
36 | { ALLOW_MEDIUM_REMOVAL, 0, 0, 0, 0, 0 }, |
37 | { START_STOP, 0, 0, 0, 1, 0 }, |
38 | { START_STOP, 0, 0, 0, 2, 0 } |
39 | }; |
40 | |
41 | unsigned i; |
42 | unsigned char sense_buffer[32]; |
43 | unsigned char inqBuff[2]; |
44 | sg_io_hdr_t io_hdr; |
45 | |
46 | if ((ioctl(dev_fd, SG_GET_VERSION_NUM, &i) < 0) || (i < 30000)) |
47 | bb_error_msg_and_die("not a sg device or old sg driver"); |
48 | |
49 | memset(&io_hdr, 0, sizeof(sg_io_hdr_t)); |
50 | io_hdr.interface_id = 'S'; |
51 | io_hdr.cmd_len = 6; |
52 | io_hdr.mx_sb_len = sizeof(sense_buffer); |
53 | io_hdr.dxfer_direction = SG_DXFER_NONE; |
54 | /* io_hdr.dxfer_len = 0; */ |
55 | io_hdr.dxferp = inqBuff; |
56 | io_hdr.sbp = sense_buffer; |
57 | io_hdr.timeout = 2000; |
58 | |
59 | for (i = 0; i < 3; i++) { |
60 | io_hdr.cmdp = (void *)sg_commands[i]; |
61 | ioctl_or_perror_and_die(dev_fd, SG_IO, (void *)&io_hdr, "%s", dev); |
62 | } |
63 | |
64 | /* force kernel to reread partition table when new disc is inserted */ |
65 | ioctl(dev_fd, BLKRRPART); |
66 | } |
67 | |
68 | #define FLAG_CLOSE 1 |
69 | #define FLAG_SMART 2 |
70 | #define FLAG_SCSI 4 |
71 | |
72 | static void eject_cdrom(unsigned flags, const char *dev) |
73 | { |
74 | int cmd = CDROMEJECT; |
75 | |
76 | if (flags & FLAG_CLOSE |
77 | || (flags & FLAG_SMART && ioctl(dev_fd, CDROM_DRIVE_STATUS) == CDS_TRAY_OPEN) |
78 | ) { |
79 | cmd = CDROMCLOSETRAY; |
80 | } |
81 | |
82 | ioctl_or_perror_and_die(dev_fd, cmd, NULL, "%s", dev); |
83 | } |
84 | |
85 | int eject_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
86 | int eject_main(int argc UNUSED_PARAM, char **argv) |
87 | { |
88 | unsigned flags; |
89 | const char *device; |
90 | |
91 | opt_complementary = "?1:t--T:T--t"; |
92 | flags = getopt32(argv, "tT" USE_FEATURE_EJECT_SCSI("s")); |
93 | device = argv[optind] ? argv[optind] : "/dev/cdrom"; |
94 | |
95 | /* We used to do "umount <device>" here, but it was buggy |
96 | if something was mounted OVER cdrom and |
97 | if cdrom is mounted many times. |
98 | |
99 | This works equally well (or better): |
100 | #!/bin/sh |
101 | umount /dev/cdrom |
102 | eject /dev/cdrom |
103 | */ |
104 | |
105 | xmove_fd(xopen(device, O_RDONLY|O_NONBLOCK), dev_fd); |
106 | |
107 | if (ENABLE_FEATURE_EJECT_SCSI && (flags & FLAG_SCSI)) |
108 | eject_scsi(device); |
109 | else |
110 | eject_cdrom(flags, device); |
111 | |
112 | if (ENABLE_FEATURE_CLEAN_UP) |
113 | close(dev_fd); |
114 | |
115 | return EXIT_SUCCESS; |
116 | } |