114 lines
3.0 KiB
C
114 lines
3.0 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 the GPL v2 or later, see the file LICENSE in this tarball.
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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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#include "libbb.h"
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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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/* 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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#define FLAG_SCSI 4
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#include <scsi/sg.h>
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#include <scsi/scsi.h>
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static void eject_scsi(const int fd, const char * const dev)
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{
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int 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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char sg_commands[3][6] = {
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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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if ((ioctl(fd, SG_GET_VERSION_NUM, &i) < 0) || (i < 30000))
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bb_error_msg_and_die("not an 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 = sg_commands[i];
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ioctl_or_perror_and_die(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 inserted */
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ioctl(fd, BLKRRPART);
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}
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static void eject_cdrom(const int fd, const unsigned long flags,
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const char * const 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(fd, CDROM_DRIVE_STATUS) == CDS_TRAY_OPEN))
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cmd = CDROMCLOSETRAY;
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return ioctl_or_perror_and_die(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, char **argv)
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{
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unsigned long flags;
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const char *device;
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int dev;
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opt_complementary = "?1:t--T:T--t";
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flags = getopt32(argv, "tT" USE_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
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*/
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dev = xopen(device, O_RDONLY|O_NONBLOCK);
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if (ENABLE_FEATURE_EJECT_SCSI && (flags & FLAG_SCSI))
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eject_scsi(dev, device);
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else
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eject_cdrom(dev, flags, device);
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if (ENABLE_FEATURE_CLEAN_UP)
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close(dev);
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return EXIT_SUCCESS;
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}
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