source: branches/3.2/mindi-busybox/miscutils/eject.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 3.4 KB
Line 
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 GPLv2 or later, see file LICENSE in this source tree.
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//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"
20//usage:    IF_FEATURE_EJECT_SCSI(
21//usage:     "\n    -s  SCSI device"
22//usage:    )
23//usage:     "\n    -t  Close tray"
24//usage:     "\n    -T  Open/close tray (toggle)"
25
26#include <sys/mount.h>
27#include "libbb.h"
28/* Must be after libbb.h: they need size_t */
29#include "fix_u32.h"
30#include <scsi/sg.h>
31#include <scsi/scsi.h>
32
33/* various defines swiped from linux/cdrom.h */
34#define CDROMCLOSETRAY            0x5319  /* pendant of CDROMEJECT  */
35#define CDROMEJECT                0x5309  /* Ejects the cdrom media */
36#define CDROM_DRIVE_STATUS        0x5326  /* Get tray position, etc. */
37/* drive status possibilities returned by CDROM_DRIVE_STATUS ioctl */
38#define CDS_TRAY_OPEN        2
39
40#define dev_fd 3
41
42/* Code taken from the original eject (http://eject.sourceforge.net/),
43 * refactored it a bit for busybox (ne-bb@nicoerfurth.de) */
44
45static void eject_scsi(const char *dev)
46{
47    static const char sg_commands[3][6] = {
48        { ALLOW_MEDIUM_REMOVAL, 0, 0, 0, 0, 0 },
49        { START_STOP, 0, 0, 0, 1, 0 },
50        { START_STOP, 0, 0, 0, 2, 0 }
51    };
52
53    unsigned i;
54    unsigned char sense_buffer[32];
55    unsigned char inqBuff[2];
56    sg_io_hdr_t io_hdr;
57
58    if ((ioctl(dev_fd, SG_GET_VERSION_NUM, &i) < 0) || (i < 30000))
59        bb_error_msg_and_die("not a sg device or old sg driver");
60
61    memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
62    io_hdr.interface_id = 'S';
63    io_hdr.cmd_len = 6;
64    io_hdr.mx_sb_len = sizeof(sense_buffer);
65    io_hdr.dxfer_direction = SG_DXFER_NONE;
66    /* io_hdr.dxfer_len = 0; */
67    io_hdr.dxferp = inqBuff;
68    io_hdr.sbp = sense_buffer;
69    io_hdr.timeout = 2000;
70
71    for (i = 0; i < 3; i++) {
72        io_hdr.cmdp = (void *)sg_commands[i];
73        ioctl_or_perror_and_die(dev_fd, SG_IO, (void *)&io_hdr, "%s", dev);
74    }
75
76    /* force kernel to reread partition table when new disc is inserted */
77    ioctl(dev_fd, BLKRRPART);
78}
79
80#define FLAG_CLOSE  1
81#define FLAG_SMART  2
82#define FLAG_SCSI   4
83
84static void eject_cdrom(unsigned flags, const char *dev)
85{
86    int cmd = CDROMEJECT;
87
88    if (flags & FLAG_CLOSE
89     || ((flags & FLAG_SMART) && ioctl(dev_fd, CDROM_DRIVE_STATUS) == CDS_TRAY_OPEN)
90    ) {
91        cmd = CDROMCLOSETRAY;
92    }
93
94    ioctl_or_perror_and_die(dev_fd, cmd, NULL, "%s", dev);
95}
96
97int eject_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
98int eject_main(int argc UNUSED_PARAM, char **argv)
99{
100    unsigned flags;
101    const char *device;
102
103    opt_complementary = "?1:t--T:T--t";
104    flags = getopt32(argv, "tT" IF_FEATURE_EJECT_SCSI("s"));
105    device = argv[optind] ? argv[optind] : "/dev/cdrom";
106
107    /* We used to do "umount <device>" here, but it was buggy
108       if something was mounted OVER cdrom and
109       if cdrom is mounted many times.
110
111       This works equally well (or better):
112       #!/bin/sh
113       umount /dev/cdrom
114       eject /dev/cdrom
115    */
116
117    xmove_fd(xopen_nonblocking(device), dev_fd);
118
119    if (ENABLE_FEATURE_EJECT_SCSI && (flags & FLAG_SCSI))
120        eject_scsi(device);
121    else
122        eject_cdrom(flags, device);
123
124    if (ENABLE_FEATURE_CLEAN_UP)
125        close(dev_fd);
126
127    return EXIT_SUCCESS;
128}
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