/* 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; }