mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-11 21:44:38 +00:00
153 lines
4.0 KiB
C
153 lines
4.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* eject implementation for busybox
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*
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* Copyright (C) 2004 Peter Willis <psyphreak@phreaker.net>
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* Copyright (C) 2005 Tito Ragusa <farmatito@tiscali.it>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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/*
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* This is a simple hack of eject based on something Erik posted in #uclibc.
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* Most of the dirty work blatantly ripped off from cat.c =)
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*/
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//config:config EJECT
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//config: bool "eject"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: Used to eject cdroms. (defaults to /dev/cdrom)
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//config:
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//config:config FEATURE_EJECT_SCSI
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//config: bool "SCSI support"
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//config: default y
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//config: depends on EJECT
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//config: help
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//config: Add the -s option to eject, this allows to eject SCSI-Devices and
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//config: usb-storage devices.
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//applet:IF_EJECT(APPLET(eject, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_EJECT) += eject.o
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//usage:#define eject_trivial_usage
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//usage: "[-t] [-T] [DEVICE]"
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//usage:#define eject_full_usage "\n\n"
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//usage: "Eject DEVICE or default /dev/cdrom\n"
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//usage: IF_FEATURE_EJECT_SCSI(
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//usage: "\n -s SCSI device"
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//usage: )
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//usage: "\n -t Close tray"
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//usage: "\n -T Open/close tray (toggle)"
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#include <sys/mount.h>
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#include "libbb.h"
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#if ENABLE_FEATURE_EJECT_SCSI
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/* Must be after libbb.h: they need size_t */
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# include "fix_u32.h"
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# include <scsi/sg.h>
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# include <scsi/scsi.h>
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#endif
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#define dev_fd 3
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/* Code taken from the original eject (http://eject.sourceforge.net/),
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* refactored it a bit for busybox (ne-bb@nicoerfurth.de) */
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#if ENABLE_FEATURE_EJECT_SCSI
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static void eject_scsi(const char *dev)
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{
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static const char sg_commands[3][6] ALIGN1 = {
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{ ALLOW_MEDIUM_REMOVAL, 0, 0, 0, 0, 0 },
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{ START_STOP, 0, 0, 0, 1, 0 },
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{ START_STOP, 0, 0, 0, 2, 0 }
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};
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unsigned i;
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unsigned char sense_buffer[32];
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unsigned char inqBuff[2];
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sg_io_hdr_t io_hdr;
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if ((ioctl(dev_fd, SG_GET_VERSION_NUM, &i) < 0) || (i < 30000))
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bb_error_msg_and_die("not a sg device or old sg driver");
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memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
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io_hdr.interface_id = 'S';
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io_hdr.cmd_len = 6;
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io_hdr.mx_sb_len = sizeof(sense_buffer);
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io_hdr.dxfer_direction = SG_DXFER_NONE;
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/* io_hdr.dxfer_len = 0; */
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io_hdr.dxferp = inqBuff;
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io_hdr.sbp = sense_buffer;
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io_hdr.timeout = 2000;
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for (i = 0; i < 3; i++) {
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io_hdr.cmdp = (void *)sg_commands[i];
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ioctl_or_perror_and_die(dev_fd, SG_IO, (void *)&io_hdr, "%s", dev);
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}
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/* force kernel to reread partition table when new disc is inserted */
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ioctl(dev_fd, BLKRRPART);
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}
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#else
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# define eject_scsi(dev) ((void)0)
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#endif
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/* various defines swiped from linux/cdrom.h */
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#define CDROMCLOSETRAY 0x5319 /* pendant of CDROMEJECT */
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#define CDROMEJECT 0x5309 /* Ejects the cdrom media */
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#define CDROM_DRIVE_STATUS 0x5326 /* Get tray position, etc. */
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/* drive status possibilities returned by CDROM_DRIVE_STATUS ioctl */
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#define CDS_TRAY_OPEN 2
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#define FLAG_CLOSE 1
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#define FLAG_SMART 2
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#define FLAG_SCSI 4
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static void eject_cdrom(unsigned flags, const char *dev)
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{
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int cmd = CDROMEJECT;
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if (flags & FLAG_CLOSE
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|| ((flags & FLAG_SMART) && ioctl(dev_fd, CDROM_DRIVE_STATUS) == CDS_TRAY_OPEN)
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) {
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cmd = CDROMCLOSETRAY;
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}
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ioctl_or_perror_and_die(dev_fd, cmd, NULL, "%s", dev);
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}
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int eject_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int eject_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned flags;
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const char *device;
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opt_complementary = "?1:t--T:T--t";
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flags = getopt32(argv, "tT" IF_FEATURE_EJECT_SCSI("s"));
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device = argv[optind] ? argv[optind] : "/dev/cdrom";
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/* We used to do "umount <device>" here, but it was buggy
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if something was mounted OVER cdrom and
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if cdrom is mounted many times.
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This works equally well (or better):
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#!/bin/sh
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umount /dev/cdrom
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eject /dev/cdrom
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*/
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xmove_fd(xopen_nonblocking(device), dev_fd);
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if (ENABLE_FEATURE_EJECT_SCSI && (flags & FLAG_SCSI))
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eject_scsi(device);
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else
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eject_cdrom(flags, device);
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if (ENABLE_FEATURE_CLEAN_UP)
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close(dev_fd);
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return EXIT_SUCCESS;
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}
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