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/* vi: set sw=4 ts=4: */
/*
* eject implementation for busybox
*
* Copyright (C) 2004 Peter Willis <psyphreak@phreaker.net>
* Copyright (C) 2005 Tito Ragusa <farmatito@tiscali.it>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/*
* This is a simple hack of eject based on something Erik posted in #uclibc.
* Most of the dirty work blatantly ripped off from cat.c =)
*/
//config:config EJECT
//config: bool "eject (4 kb)"
//config: default y
//config: help
//config: Used to eject cdroms. (defaults to /dev/cdrom)
//config:
//config:config FEATURE_EJECT_SCSI
//config: bool "SCSI support"
//config: default y
//config: depends on EJECT
//config: help
//config: Add the -s option to eject, this allows to eject SCSI-Devices and
//config: usb-storage devices.
//applet:IF_EJECT(APPLET(eject, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_EJECT) += eject.o
//usage:#define eject_trivial_usage
//usage: "[-t] [-T] [DEVICE]"
//usage:#define eject_full_usage "\n\n"
//usage: "Eject DEVICE or default /dev/cdrom\n"
//usage: IF_FEATURE_EJECT_SCSI(
//usage: "\n -s SCSI device"
//usage: )
//usage: "\n -t Close tray"
//usage: "\n -T Open/close tray (toggle)"
#include <sys/mount.h>
#include "libbb.h"
#if ENABLE_FEATURE_EJECT_SCSI
/* Must be after libbb.h: they need size_t */
# include "fix_u32.h"
# include <scsi/sg.h>
# include <scsi/scsi.h>
#endif
#define dev_fd 3
/* Code taken from the original eject (http://eject.sourceforge.net/),
* refactored it a bit for busybox (ne-bb@nicoerfurth.de) */
#if ENABLE_FEATURE_EJECT_SCSI
static void eject_scsi(const char *dev)
{
static const char sg_commands[3][6] ALIGN1 = {
{ ALLOW_MEDIUM_REMOVAL, 0, 0, 0, 0, 0 },
{ START_STOP, 0, 0, 0, 1, 0 },
{ START_STOP, 0, 0, 0, 2, 0 }
};
unsigned i;
unsigned char sense_buffer[32];
unsigned char inqBuff[2];
sg_io_hdr_t io_hdr;
if ((ioctl(dev_fd, SG_GET_VERSION_NUM, &i) < 0) || (i < 30000))
bb_simple_error_msg_and_die("not a sg device or old sg driver");
memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
io_hdr.interface_id = 'S';
io_hdr.cmd_len = 6;
io_hdr.mx_sb_len = sizeof(sense_buffer);
io_hdr.dxfer_direction = SG_DXFER_NONE;
/* io_hdr.dxfer_len = 0; */
io_hdr.dxferp = inqBuff;
io_hdr.sbp = sense_buffer;
io_hdr.timeout = 2000;
for (i = 0; i < 3; i++) {
io_hdr.cmdp = (void *)sg_commands[i];
ioctl_or_perror_and_die(dev_fd, SG_IO, (void *)&io_hdr, "%s", dev);
}
/* force kernel to reread partition table when new disc is inserted */
ioctl(dev_fd, BLKRRPART);
}
#else
# define eject_scsi(dev) ((void)0)
#endif
/* various defines swiped from linux/cdrom.h */
#define CDROMCLOSETRAY 0x5319 /* pendant of CDROMEJECT */
#define CDROMEJECT 0x5309 /* Ejects the cdrom media */
#define CDROM_DRIVE_STATUS 0x5326 /* Get tray position, etc. */
/* drive status possibilities returned by CDROM_DRIVE_STATUS ioctl */
#define CDS_TRAY_OPEN 2
#define FLAG_CLOSE 1
#define FLAG_SMART 2
#define FLAG_SCSI 4
static void eject_cdrom(unsigned flags, const char *dev)
{
int cmd = CDROMEJECT;
if (flags & FLAG_CLOSE
|| ((flags & FLAG_SMART) && ioctl(dev_fd, CDROM_DRIVE_STATUS) == CDS_TRAY_OPEN)
) {
cmd = CDROMCLOSETRAY;
}
ioctl_or_perror_and_die(dev_fd, cmd, NULL, "%s", dev);
}
int eject_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int eject_main(int argc UNUSED_PARAM, char **argv)
{
unsigned flags;
const char *device;
flags = getopt32(argv, "^" "tT"IF_FEATURE_EJECT_SCSI("s")
"\0" "?1:t--T:T--t"
);
device = argv[optind] ? argv[optind] : "/dev/cdrom";
/* We used to do "umount <device>" here, but it was buggy
if something was mounted OVER cdrom and
if cdrom is mounted many times.
This works equally well (or better):
#!/bin/sh
umount /dev/cdrom
eject /dev/cdrom
*/
xmove_fd(xopen_nonblocking(device), dev_fd);
if (ENABLE_FEATURE_EJECT_SCSI && (flags & FLAG_SCSI))
eject_scsi(device);
else
eject_cdrom(flags, device);
if (ENABLE_FEATURE_CLEAN_UP)
close(dev_fd);
return EXIT_SUCCESS;
}
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