| /* 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 =) |
| */ |
| |
| //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" |
| /* Must be after libbb.h: they need size_t */ |
| #include "fix_u32.h" |
| #include <scsi/sg.h> |
| #include <scsi/scsi.h> |
| |
| /* 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 dev_fd 3 |
| |
| /* Code taken from the original eject (http://eject.sourceforge.net/), |
| * refactored it a bit for busybox (ne-bb@nicoerfurth.de) */ |
| |
| static void eject_scsi(const char *dev) |
| { |
| static const char sg_commands[3][6] = { |
| { 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_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); |
| } |
| |
| #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; |
| |
| opt_complementary = "?1:t--T:T--t"; |
| flags = getopt32(argv, "tT" IF_FEATURE_EJECT_SCSI("s")); |
| 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; |
| } |