sys-utils/eject.c

   1 /*
   2  * Copyright (C) 1994-2005 Jeff Tranter (tranter@pobox.com)
   3  * Copyright (C) 2012 Karel Zak <kzak@redhat.com>
   4  * Copyright (C) Michal Luscon <mluscon@redhat.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  */
  20
  21 #include <unistd.h>
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <fcntl.h>
  26 #include <limits.h>
  27 #include <err.h>
  28 #include <stdarg.h>
  29
  30 #include <getopt.h>
  31 #include <errno.h>
  32 #include <regex.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <sys/ioctl.h>
  36 #include <sys/wait.h>
  37 #include <sys/mtio.h>
  38 #include <linux/cdrom.h>
  39 #include <linux/fd.h>
  40 #include <sys/mount.h>
  41 #include <scsi/scsi.h>
  42 #include <scsi/sg.h>
  43 #include <scsi/scsi_ioctl.h>
  44 #include <sys/time.h>
  45
  46 #include <libmount.h>
  47
  48 #include "c.h"
  49 #include "closestream.h"
  50 #include "nls.h"
  51 #include "strutils.h"
  52 #include "xalloc.h"
  53 #include "pathnames.h"
  54 #include "sysfs.h"
  55
  56 /*
  57  * sg_io_hdr_t driver_status -- see kernel include/scsi/scsi.h
  58  */
  59 #ifndef DRIVER_SENSE
  60 # define DRIVER_SENSE   0x08
  61 #endif
  62
  63
  64 #define EJECT_DEFAULT_DEVICE "/dev/cdrom"
  65
  66
  67 /* Used by the toggle_tray() function. If ejecting the tray takes this
  68  * time or less, the tray was probably already ejected, so we close it
  69  * again.
  70  */
  71 #define TRAY_WAS_ALREADY_OPEN_USECS  200000     /* about 0.2 seconds */
  72
  73 /* eject(1) is able to eject only 'removable' devices (attribute in /sys)
  74  * _or_ devices connected by hotplug subsystem.
  75  */
  76 static const char * const hotplug_subsystems[] = {
  77         "usb",
  78         "ieee1394",
  79         "pcmcia",
  80         "mmc",
  81         "ccw"
  82 };
  83
  84 /* Global Variables */
  85 static int a_option; /* command flags and arguments */
  86 static int c_option;
  87 static int d_option;
  88 static int f_option;
  89 static int F_option;
  90 static int n_option;
  91 static int q_option;
  92 static int r_option;
  93 static int s_option;
  94 static int t_option;
  95 static int T_option;
  96 static int X_option;
  97 static int v_option;
  98 static int x_option;
  99 static int p_option;
 100 static int m_option;
 101 static int M_option;
 102 static int i_option;
 103 static int a_arg;
 104 static int i_arg;
 105 static long int c_arg;
 106 static long int x_arg;
 107
 108 struct libmnt_table *mtab;
 109 struct libmnt_cache *cache;
 110
 111 static void vinfo(const char *fmt, va_list va)
 112 {
 113         fprintf(stdout, "%s: ", program_invocation_short_name);
 114         vprintf(fmt, va);
 115         fputc('\n', stdout);
 116 }
 117
 118 static inline void verbose(const char *fmt, ...)
 119 {
 120         va_list va;
 121
 122         if (!v_option)
 123                 return;
 124
 125         va_start(va, fmt);
 126         vinfo(fmt, va);
 127         va_end(va);
 128 }
 129
 130 static inline void info(const char *fmt, ...)
 131 {
 132         va_list va;
 133         va_start(va, fmt);
 134         vinfo(fmt, va);
 135         va_end(va);
 136 }
 137
 138 static void __attribute__ ((__noreturn__)) usage(FILE * out)
 139 {
 140         fputs(USAGE_HEADER, out);
 141
 142         fprintf(out,
 143                 _(" %s [options] [<device>|<mountpoint>]\n"), program_invocation_short_name);
 144
 145         fputs(USAGE_OPTIONS, out);
 146         fputs(_(" -a, --auto <on|off>         turn auto-eject feature on or off\n"
 147                 " -c, --changerslot <slot>    switch discs on a CD-ROM changer\n"
 148                 " -d, --default               display default device\n"
 149                 " -f, --floppy                eject floppy\n"
 150                 " -F, --force                 don't care about device type\n"
 151                 " -i, --manualeject <on|off>  toggle manual eject protection on/off\n"
 152                 " -m, --no-unmount            do not unmount device even if it is mounted\n"
 153                 " -M, --no-partitions-unmount do not unmount another partitions\n"
 154                 " -n, --noop                  don't eject, just show device found\n"
 155                 " -p, --proc                  use /proc/mounts instead of /etc/mtab\n"
 156                 " -q, --tape                  eject tape\n"
 157                 " -r, --cdrom                 eject CD-ROM\n"
 158                 " -s, --scsi                  eject SCSI device\n"
 159                 " -t, --trayclose             close tray\n"
 160                 " -T, --traytoggle            toggle tray\n"
 161                 " -v, --verbose               enable verbose output\n"
 162                 " -x, --cdspeed <speed>       set CD-ROM max speed\n"
 163                 " -X, --listspeed             list CD-ROM available speeds\n"),
 164                 out);
 165
 166         fputs(USAGE_SEPARATOR, out);
 167         fputs(USAGE_HELP, out);
 168         fputs(USAGE_VERSION, out);
 169
 170         fputs(_("\nBy default tries -r, -s, -f, and -q in order until success.\n"), out);
 171         fprintf(out, USAGE_MAN_TAIL("eject(1)"));
 172
 173         exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
 174 }
 175
 176
 177 /* Handle command line options. */
 178 static void parse_args(int argc, char **argv, char **device)
 179 {
 180         static const struct option long_opts[] =
 181         {
 182                 {"auto",        required_argument, NULL, 'a'},
 183                 {"cdrom",       no_argument,       NULL, 'r'},
 184                 {"cdspeed",     required_argument, NULL, 'x'},
 185                 {"changerslot", required_argument, NULL, 'c'},
 186                 {"default",     no_argument,       NULL, 'd'},
 187                 {"floppy",      no_argument,       NULL, 'f'},
 188                 {"force",       no_argument,       NULL, 'F'},
 189                 {"help",        no_argument,       NULL, 'h'},
 190                 {"listspeed",   no_argument,       NULL, 'X'},
 191                 {"manualeject", required_argument, NULL, 'i'},
 192                 {"noop",        no_argument,       NULL, 'n'},
 193                 {"no-unmount",  no_argument,       NULL, 'm'},
 194                 {"no-partitions-unmount", no_argument, NULL, 'M' },
 195                 {"proc",        no_argument,       NULL, 'p'},
 196                 {"scsi",        no_argument,       NULL, 's'},
 197                 {"tape",        no_argument,       NULL, 'q'},
 198                 {"trayclose",   no_argument,       NULL, 't'},
 199                 {"traytoggle",  no_argument,       NULL, 'T'},
 200                 {"verbose",     no_argument,       NULL, 'v'},
 201                 {"version",     no_argument,       NULL, 'V'},
 202                 {0, 0, 0, 0}
 203         };
 204         int c;
 205
 206         while ((c = getopt_long(argc, argv,
 207                                 "a:c:i:x:dfFhnqrstTXvVpmM", long_opts, NULL)) != -1) {
 208                 switch (c) {
 209                 case 'a':
 210                         a_option = 1;
 211                         if (!strcmp(optarg, "0") || !strcmp(optarg, "off"))
 212                                 a_arg = 0;
 213                         else if (!strcmp(optarg, "1") || !strcmp(optarg, "on"))
 214                                 a_arg = 1;
 215                         else
 216                                 errx(EXIT_FAILURE, _("invalid argument to --auto/-a option"));
 217                         break;
 218                 case 'c':
 219                         c_option = 1;
 220                         c_arg = strtoul_or_err(optarg, _("invalid argument to --changerslot/-c option"));
 221                         break;
 222                 case 'x':
 223                         x_option = 1;
 224                         x_arg = strtoul_or_err(optarg, _("invalid argument to --cdspeed/-x option"));
 225                         break;
 226                 case 'd':
 227                         d_option = 1;
 228                         break;
 229                 case 'f':
 230                         f_option = 1;
 231                         break;
 232                 case 'F':
 233                         F_option = 1;
 234                         break;
 235                 case 'h':
 236                         usage(stdout);
 237                         break;
 238                 case 'i':
 239                         i_option = 1;
 240                         if (!strcmp(optarg, "0") || !strcmp(optarg, "off"))
 241                                 i_arg = 0;
 242                         else if (!strcmp(optarg, "1") || !strcmp(optarg, "on"))
 243                                 i_arg = 1;
 244                         else
 245                                 errx(EXIT_FAILURE, _("invalid argument to --manualeject/-i option"));
 246                         break;
 247                 case 'm':
 248                         m_option = 1;
 249                         break;
 250                 case 'M':
 251                         M_option = 1;
 252                         break;
 253                 case 'n':
 254                         n_option = 1;
 255                         break;
 256                 case 'p':
 257                         p_option = 1;
 258                         break;
 259                 case 'q':
 260                         q_option = 1;
 261                         break;
 262                 case 'r':
 263                         r_option = 1;
 264                         break;
 265                 case 's':
 266                         s_option = 1;
 267                         break;
 268                 case 't':
 269                         t_option = 1;
 270                         break;
 271                 case 'T':
 272                         T_option = 1;
 273                         break;
 274                 case 'X':
 275                         X_option = 1;
 276                         break;
 277                 case 'v':
 278                         v_option = 1;
 279                         break;
 280                 case 'V':
 281                         printf(UTIL_LINUX_VERSION);
 282                         exit(EXIT_SUCCESS);
 283                         break;
 284                 default:
 285                 case '?':
 286                         usage(stderr);
 287                         break;
 288                 }
 289         }
 290
 291         /* check for a single additional argument */
 292         if ((argc - optind) > 1)
 293                 errx(EXIT_FAILURE, _("too many arguments"));
 294
 295         if ((argc - optind) == 1)
 296                 *device = xstrdup(argv[optind]);
 297 }
 298
 299 /*
 300  * Given name, such as foo, see if any of the following exist:
 301  *
 302  * foo (if foo starts with '.' or '/')
 303  * /dev/foo
 304  *
 305  * If found, return the full path. If not found, return 0.
 306  * Returns pointer to dynamically allocated string.
 307  */
 308 static char *find_device(const char *name)
 309 {
 310         if (!name)
 311                 return NULL;
 312
 313         if ((*name == '.' || *name == '/') && access(name, F_OK) == 0)
 314                 return xstrdup(name);
 315         else {
 316                 char buf[PATH_MAX];
 317
 318                 snprintf(buf, sizeof(buf), "/dev/%s", name);
 319                 if (access(buf, F_OK) == 0)
 320                         return xstrdup(buf);
 321         }
 322
 323         return NULL;
 324 }
 325
 326 /* Set or clear auto-eject mode. */
 327 static void auto_eject(int fd, int on)
 328 {
 329         int status = -1;
 330
 331 #if defined(CDROM_SET_OPTIONS) && defined(CDROM_CLEAR_OPTIONS)
 332         if (on)
 333                 status = ioctl(fd, CDROM_SET_OPTIONS, CDO_AUTO_EJECT);
 334         else
 335                 status = ioctl(fd, CDROM_CLEAR_OPTIONS, CDO_AUTO_EJECT);
 336 #else
 337         errno = ENOSYS;
 338 #endif
 339         if (status < 0)
 340                 err(EXIT_FAILURE,_("CD-ROM auto-eject command failed"));
 341 }
 342
 343 /*
 344  * Stops CDROM from opening on manual eject pressing the button.
 345  * This can be useful when you carry your laptop
 346  * in your bag while it's on and no CD inserted in it's drive.
 347  * Implemented as found in Documentation/ioctl/cdrom.txt
 348  *
 349  * TODO: Maybe we should check this also:
 350  * EDRIVE_CANT_DO_THIS   Door lock function not supported.
 351  * EBUSY                 Attempt to unlock when multiple users
 352  *                       have the drive open and not CAP_SYS_ADMIN
 353  */
 354 static void manual_eject(int fd, int on)
 355 {
 356         if (ioctl(fd, CDROM_LOCKDOOR, on) < 0)
 357                 err(EXIT_FAILURE, _("CD-ROM lock door command failed"));
 358
 359         if (on)
 360                 info(_("CD-Drive may NOT be ejected with device button"));
 361         else
 362                 info(_("CD-Drive may be ejected with device button"));
 363 }
 364
 365 /*
 366  * Changer select. CDROM_SELECT_DISC is preferred, older kernels used
 367  * CDROMLOADFROMSLOT.
 368  */
 369 static void changer_select(int fd, int slot)
 370 {
 371 #ifdef CDROM_SELECT_DISC
 372         if (ioctl(fd, CDROM_SELECT_DISC, slot) < 0)
 373                 err(EXIT_FAILURE, _("CD-ROM select disc command failed"));
 374
 375 #elif defined CDROMLOADFROMSLOT
 376         if (ioctl(fd, CDROMLOADFROMSLOT, slot) != 0)
 377                 err(EXIT_FAILURE, _("CD-ROM load from slot command failed"));
 378 #else
 379         warnx(_("IDE/ATAPI CD-ROM changer not supported by this kernel\n") );
 380 #endif
 381 }
 382
 383 /*
 384  * Close tray. Not supported by older kernels.
 385  */
 386 static void close_tray(int fd)
 387 {
 388         int status;
 389
 390 #if defined(CDROMCLOSETRAY) || defined(CDIOCCLOSE)
 391 #if defined(CDROMCLOSETRAY)
 392         status = ioctl(fd, CDROMCLOSETRAY);
 393 #elif defined(CDIOCCLOSE)
 394         status = ioctl(fd, CDIOCCLOSE);
 395 #endif
 396         if (status != 0)
 397                 err(EXIT_FAILURE, _("CD-ROM tray close command failed"));
 398 #else
 399         warnx(_("CD-ROM tray close command not supported by this kernel\n"));
 400 #endif
 401 }
 402
 403 /*
 404  * Eject using CDROMEJECT ioctl.
 405  */
 406 static int eject_cdrom(int fd)
 407 {
 408 #if defined(CDROMEJECT)
 409         int ret = ioctl(fd, CDROM_LOCKDOOR, 0);
 410         if (ret < 0)
 411                 return 0;
 412         return ioctl(fd, CDROMEJECT) >= 0;
 413 #elif defined(CDIOCEJECT)
 414         return ioctl(fd, CDIOCEJECT) >= 0;
 415 #else
 416         warnx(_("CD-ROM eject unsupported"));
 417         errno = ENOSYS;
 418         return 0;
 419 #endif
 420 }
 421
 422 /*
 423  * Toggle tray.
 424  *
 425  * Written by Benjamin Schwenk <benjaminschwenk@yahoo.de> and
 426  * Sybren Stuvel <sybren@thirdtower.com>
 427  *
 428  * Not supported by older kernels because it might use
 429  * CloseTray().
 430  *
 431  */
 432 static void toggle_tray(int fd)
 433 {
 434         struct timeval time_start, time_stop;
 435         int time_elapsed;
 436
 437 #ifdef CDROM_DRIVE_STATUS
 438         /* First ask the CDROM for info, otherwise fall back to manual.  */
 439         switch (ioctl(fd, CDROM_DRIVE_STATUS)) {
 440         case CDS_TRAY_OPEN:
 441                 close_tray(fd);
 442                 return;
 443
 444         case CDS_NO_DISC:
 445         case CDS_DISC_OK:
 446                 if (!eject_cdrom(fd))
 447                         err(EXIT_FAILURE, _("CD-ROM eject command failed"));
 448                 return;
 449         case CDS_NO_INFO:
 450                 warnx(_("no CD-ROM information available"));
 451                 return;
 452         case CDS_DRIVE_NOT_READY:
 453                 warnx(_("CD-ROM drive is not ready"));
 454                 return;
 455         default:
 456                 abort();
 457         }
 458 #endif
 459
 460         /* Try to open the CDROM tray and measure the time therefor
 461          * needed.  In my experience the function needs less than 0.05
 462          * seconds if the tray was already open, and at least 1.5 seconds
 463          * if it was closed.  */
 464         gettimeofday(&time_start, NULL);
 465
 466         /* Send the CDROMEJECT command to the device. */
 467         if (!eject_cdrom(fd))
 468                 err(EXIT_FAILURE, _("CD-ROM eject command failed"));
 469
 470         /* Get the second timestamp, to measure the time needed to open
 471          * the tray.  */
 472         gettimeofday(&time_stop, NULL);
 473
 474         time_elapsed = (time_stop.tv_sec * 1000000 + time_stop.tv_usec) -
 475                 (time_start.tv_sec * 1000000 + time_start.tv_usec);
 476
 477         /* If the tray "opened" too fast, we can be nearly sure, that it
 478          * was already open. In this case, close it now. Else the tray was
 479          * closed before. This would mean that we are done.  */
 480         if (time_elapsed < TRAY_WAS_ALREADY_OPEN_USECS)
 481                 close_tray(fd);
 482 }
 483
 484 /*
 485  * Select Speed of CD-ROM drive.
 486  * Thanks to Roland Krivanek (krivanek@fmph.uniba.sk)
 487  * http://dmpc.dbp.fmph.uniba.sk/~krivanek/cdrom_speed/
 488  */
 489 static void select_speed(int fd, int speed)
 490 {
 491 #ifdef CDROM_SELECT_SPEED
 492         if (ioctl(fd, CDROM_SELECT_SPEED, speed) != 0)
 493                 err(EXIT_FAILURE, _("CD-ROM select speed command failed"));
 494 #else
 495         warnx(_("CD-ROM select speed command not supported by this kernel"));
 496 #endif
 497 }
 498
 499 /*
 500  * Read Speed of CD-ROM drive. From Linux 2.6.13, the current speed
 501  * is correctly reported
 502  */
 503 static int read_speed(const char *devname)
 504 {
 505         int drive_number = -1;
 506         char *name;
 507         FILE *f;
 508
 509         f = fopen(_PATH_PROC_CDROMINFO, "r");
 510         if (!f)
 511                 err(EXIT_FAILURE, _("cannot open %s"), _PATH_PROC_CDROMINFO);
 512
 513         name = strrchr(devname, '/') + 1;
 514
 515         while (name && !feof(f)) {
 516                 char line[512];
 517                 char *str;
 518
 519                 if (!fgets(line, sizeof(line), f))
 520                         break;
 521
 522                 /* find drive number in line "drive name" */
 523                 if (drive_number == -1) {
 524                         if (strncmp(line, "drive name:", 11) == 0) {
 525                                 str = strtok(&line[11], "\t ");
 526                                 drive_number = 0;
 527                                 while (str && strncmp(name, str, strlen(name)) != 0) {
 528                                         drive_number++;
 529                                         str = strtok(NULL, "\t ");
 530                                         if (!str)
 531                                                 errx(EXIT_FAILURE,
 532                                                      _("%s: failed to finding CD-ROM name"),
 533                                                      _PATH_PROC_CDROMINFO);
 534                                 }
 535                         }
 536                 /* find line "drive speed" and read the correct speed */
 537                 } else {
 538                         if (strncmp(line, "drive speed:", 12) == 0) {
 539                                 int i;
 540
 541                                 str = strtok(&line[12], "\t ");
 542                                 for (i = 1; i < drive_number; i++)
 543                                         str = strtok(NULL, "\t ");
 544
 545                                 if (!str)
 546                                         errx(EXIT_FAILURE,
 547                                                 _("%s: failed to read speed"),
 548                                                 _PATH_PROC_CDROMINFO);
 549                                 fclose(f);
 550                                 return atoi(str);
 551                         }
 552                 }
 553         }
 554
 555         errx(EXIT_FAILURE, _("failed to read speed"));
 556 }
 557
 558 /*
 559  * List Speed of CD-ROM drive.
 560  */
 561 static void list_speeds(const char *name, int fd)
 562 {
 563 #ifdef CDROM_SELECT_SPEED
 564         int max_speed, curr_speed = 0, prev_speed;
 565
 566         select_speed(fd, 0);
 567         max_speed = read_speed(name);
 568
 569         while (curr_speed < max_speed) {
 570                 prev_speed = curr_speed;
 571                 select_speed(fd, prev_speed + 1);
 572                 curr_speed = read_speed(name);
 573                 if (curr_speed > prev_speed)
 574                         printf("%d ", curr_speed);
 575                 else
 576                         curr_speed = prev_speed + 1;
 577         }
 578
 579         printf("\n");
 580 #else
 581         warnx(_("CD-ROM select speed command not supported by this kernel"));
 582 #endif
 583 }
 584
 585 /*
 586  * Eject using SCSI SG_IO commands. Return 1 if successful, 0 otherwise.
 587  */
 588 static int eject_scsi(int fd)
 589 {
 590         int status, k;
 591         sg_io_hdr_t io_hdr;
 592         unsigned char allowRmBlk[6] = {ALLOW_MEDIUM_REMOVAL, 0, 0, 0, 0, 0};
 593         unsigned char startStop1Blk[6] = {START_STOP, 0, 0, 0, 1, 0};
 594         unsigned char startStop2Blk[6] = {START_STOP, 0, 0, 0, 2, 0};
 595         unsigned char inqBuff[2];
 596         unsigned char sense_buffer[32];
 597
 598         if ((ioctl(fd, SG_GET_VERSION_NUM, &k) < 0) || (k < 30000)) {
 599                 verbose(_("not an sg device, or old sg driver"));
 600                 return 0;
 601         }
 602
 603         memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
 604         io_hdr.interface_id = 'S';
 605         io_hdr.cmd_len = 6;
 606         io_hdr.mx_sb_len = sizeof(sense_buffer);
 607         io_hdr.dxfer_direction = SG_DXFER_NONE;
 608         io_hdr.dxfer_len = 0;
 609         io_hdr.dxferp = inqBuff;
 610         io_hdr.sbp = sense_buffer;
 611         io_hdr.timeout = 10000;
 612
 613         io_hdr.cmdp = allowRmBlk;
 614         status = ioctl(fd, SG_IO, (void *)&io_hdr);
 615         if (status < 0 || io_hdr.host_status || io_hdr.driver_status)
 616                 return 0;
 617
 618         io_hdr.cmdp = startStop1Blk;
 619         status = ioctl(fd, SG_IO, (void *)&io_hdr);
 620         if (status < 0 || io_hdr.host_status)
 621                 return 0;
 622
 623         /* Ignore errors when there is not medium -- in this case driver sense
 624          * buffer sets MEDIUM NOT PRESENT (3a) bit. For more details see:
 625          * http://www.tldp.org/HOWTO/archived/SCSI-Programming-HOWTO/SCSI-Programming-HOWTO-22.html#sec-sensecodes
 626          * -- kzak Jun 2013
 627          */
 628         if (io_hdr.driver_status != 0 &&
 629             !(io_hdr.driver_status == DRIVER_SENSE && io_hdr.sbp &&
 630                                                       io_hdr.sbp[12] == 0x3a))
 631                 return 0;
 632
 633         io_hdr.cmdp = startStop2Blk;
 634         status = ioctl(fd, SG_IO, (void *)&io_hdr);
 635         if (status < 0 || io_hdr.host_status || io_hdr.driver_status)
 636                 return 0;
 637
 638         /* force kernel to reread partition table when new disc inserted */
 639         status = ioctl(fd, BLKRRPART);
 640         return 1;
 641 }
 642
 643 /*
 644  * Eject using FDEJECT ioctl. Return 1 if successful, 0 otherwise.
 645  */
 646 static int eject_floppy(int fd)
 647 {
 648         return ioctl(fd, FDEJECT) >= 0;
 649 }
 650
 651
 652 /*
 653  * Rewind and eject using tape ioctl. Return 1 if successful, 0 otherwise.
 654  */
 655 static int eject_tape(int fd)
 656 {
 657         struct mtop op = { .mt_op = MTOFFL, .mt_count = 0 };
 658
 659         return ioctl(fd, MTIOCTOP, &op) >= 0;
 660 }
 661
 662
 663 /* umount a device. */
 664 static void umount_one(const char *name)
 665 {
 666         int status;
 667
 668         if (!name)
 669                 return;
 670
 671         verbose(_("%s: unmounting"), name);
 672
 673         switch (fork()) {
 674         case 0: /* child */
 675                 if (setgid(getgid()) < 0)
 676                         err(EXIT_FAILURE, _("cannot set group id"));
 677
 678                 if (setuid(getuid()) < 0)
 679                         err(EXIT_FAILURE, _("cannot set user id"));
 680
 681                 if (p_option)
 682                         execl("/bin/umount", "/bin/umount", name, "-n", NULL);
 683                 else
 684                         execl("/bin/umount", "/bin/umount", name, NULL);
 685
 686                 errx(EXIT_FAILURE, _("unable to exec /bin/umount of `%s'"), name);
 687
 688         case -1:
 689                 warn( _("unable to fork"));
 690                 break;
 691
 692         default: /* parent */
 693                 wait(&status);
 694                 if (WIFEXITED(status) == 0)
 695                         errx(EXIT_FAILURE,
 696                              _("unmount of `%s' did not exit normally"), name);
 697
 698                 if (WEXITSTATUS(status) != 0)
 699                         errx(EXIT_FAILURE, _("unmount of `%s' failed\n"), name);
 700                 break;
 701         }
 702 }
 703
 704 /* Open a device file. */
 705 static int open_device(const char *name)
 706 {
 707         int fd = open(name, O_RDWR|O_NONBLOCK);
 708
 709         if (fd < 0)
 710                 fd = open(name, O_RDONLY|O_NONBLOCK);
 711         if (fd == -1)
 712                 err(EXIT_FAILURE, _("cannot open %s"), name);
 713         return fd;
 714 }
 715
 716 /*
 717  * See if device has been mounted by looking in mount table.  If so, set
 718  * device name and mount point name, and return 1, otherwise return 0.
 719  */
 720 static int device_get_mountpoint(char **devname, char **mnt)
 721 {
 722         struct libmnt_fs *fs;
 723         int rc;
 724
 725         *mnt = NULL;
 726
 727         if (!mtab) {
 728                 mtab = mnt_new_table();
 729                 if (!mtab)
 730                         err(EXIT_FAILURE, _("failed to initialize libmount table"));
 731
 732                 cache = mnt_new_cache();
 733                 mnt_table_set_cache(mtab, cache);
 734
 735                 if (p_option)
 736                         rc = mnt_table_parse_file(mtab, _PATH_PROC_MOUNTINFO);
 737                 else
 738                         rc = mnt_table_parse_mtab(mtab, NULL);
 739                 if (rc)
 740                         err(EXIT_FAILURE, _("failed to parse mount table"));
 741         }
 742
 743         fs = mnt_table_find_source(mtab, *devname, MNT_ITER_BACKWARD);
 744         if (!fs) {
 745                 /* maybe 'devname' is mountpoint rather than a real device */
 746                 fs = mnt_table_find_target(mtab, *devname, MNT_ITER_BACKWARD);
 747                 if (fs) {
 748                         free(*devname);
 749                         *devname = xstrdup(mnt_fs_get_source(fs));
 750                 }
 751         }
 752
 753         if (fs)
 754                 *mnt = xstrdup(mnt_fs_get_target(fs));
 755         return *mnt ? 0 : -1;
 756 }
 757
 758 static char *get_disk_devname(const char *device)
 759 {
 760         struct stat st;
 761         dev_t diskno = 0;
 762         char diskname[128];
 763
 764         if (stat(device, &st) != 0)
 765                 return NULL;
 766
 767         /* get whole-disk devno */
 768         if (sysfs_devno_to_wholedisk(st.st_rdev, diskname,
 769                                 sizeof(diskname), &diskno) != 0)
 770                 return NULL;
 771
 772         return st.st_rdev == diskno ? NULL : find_device(diskname);
 773 }
 774
 775 static int umount_partitions(const char *disk, int checkonly)
 776 {
 777         struct sysfs_cxt cxt = UL_SYSFSCXT_EMPTY;
 778         dev_t devno;
 779         DIR *dir = NULL;
 780         struct dirent *d;
 781         int count = 0;
 782
 783         devno = sysfs_devname_to_devno(disk, NULL);
 784         if (sysfs_init(&cxt, devno, NULL) != 0)
 785                 return 0;
 786
 787         /* open /sys/block/<wholedisk> */
 788         if (!(dir = sysfs_opendir(&cxt, NULL)))
 789                 goto done;
 790
 791         /* scan for partition subdirs */
 792         while ((d = readdir(dir))) {
 793                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
 794                         continue;
 795
 796                 if (sysfs_is_partition_dirent(dir, d, disk)) {
 797                         char *mnt = NULL;
 798                         char *dev = find_device(d->d_name);
 799
 800                         if (dev && device_get_mountpoint(&dev, &mnt) == 0) {
 801                                 verbose(_("%s: mounted on %s"), dev, mnt);
 802                                 if (!checkonly)
 803                                         umount_one(mnt);
 804                                 count++;
 805                         }
 806                         free(dev);
 807                         free(mnt);
 808                 }
 809         }
 810
 811 done:
 812         if (dir)
 813                 closedir(dir);
 814         sysfs_deinit(&cxt);
 815
 816         return count;
 817 }
 818
 819 static int is_hotpluggable_subsystem(const char *name)
 820 {
 821         size_t i;
 822
 823         for (i = 0; i < ARRAY_SIZE(hotplug_subsystems); i++)
 824                 if (strcmp(name, hotplug_subsystems[i]) == 0)
 825                         return 1;
 826
 827         return 0;
 828 }
 829
 830 #define SUBSYSTEM_LINKNAME      "/subsystem"
 831
 832 /*
 833  * For example:
 834  *
 835  * chain: /sys/dev/block/../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/ \
 836  *                           1-1.2:1.0/host65/target65:0:0/65:0:0:0/block/sdb
 837  *
 838  * The function check if <chain>/subsystem symlink exists, if yes then returns
 839  * basename of the readlink result, and remove the last subdirectory from the
 840  * <chain> path.
 841  */
 842 static char *get_subsystem(char *chain, char *buf, size_t bufsz)
 843 {
 844         size_t len;
 845         char *p;
 846
 847         if (!chain || !*chain)
 848                 return NULL;
 849
 850         len = strlen(chain);
 851         if (len + sizeof(SUBSYSTEM_LINKNAME) > PATH_MAX)
 852                 return NULL;
 853
 854         do {
 855                 ssize_t sz;
 856
 857                 /* append "/subsystem" to the path */
 858                 memcpy(chain + len, SUBSYSTEM_LINKNAME, sizeof(SUBSYSTEM_LINKNAME));
 859
 860                 /* try if subsystem symlink exists */
 861                 sz = readlink(chain, buf, bufsz - 1);
 862
 863                 /* remove last subsystem from chain */
 864                 chain[len] = '\0';
 865                 p = strrchr(chain, '/');
 866                 if (p) {
 867                         *p = '\0';
 868                         len = p - chain;
 869                 }
 870
 871                 if (sz > 0) {
 872                         /* we found symlink to subsystem, return basename */
 873                         buf[sz] = '\0';
 874                         return basename(buf);
 875                 }
 876
 877         } while (p);
 878
 879         return NULL;
 880 }
 881
 882 static int is_hotpluggable(const char* device)
 883 {
 884         struct sysfs_cxt cxt = UL_SYSFSCXT_EMPTY;
 885         char devchain[PATH_MAX];
 886         char subbuf[PATH_MAX];
 887         dev_t devno;
 888         int rc = 0;
 889         ssize_t sz;
 890         char *sub;
 891
 892         devno = sysfs_devname_to_devno(device, NULL);
 893         if (sysfs_init(&cxt, devno, NULL) != 0)
 894                 return 0;
 895
 896         /* check /sys/dev/block/<maj>:<min>/removable attribute */
 897         if (sysfs_read_int(&cxt, "removable", &rc) == 0 && rc == 1) {
 898                 verbose(_("%s: is removable device"), device);
 899                 goto done;
 900         }
 901
 902         /* read /sys/dev/block/<maj>:<min> symlink */
 903         sz = sysfs_readlink(&cxt, NULL, devchain, sizeof(devchain));
 904         if (sz <= 0 || sz + sizeof(_PATH_SYS_DEVBLOCK "/") > sizeof(devchain))
 905                 goto done;
 906
 907         devchain[sz++] = '\0';
 908
 909         /* create absolute patch from the link */
 910         memmove(devchain + sizeof(_PATH_SYS_DEVBLOCK "/") - 1, devchain, sz);
 911         memcpy(devchain, _PATH_SYS_DEVBLOCK "/",
 912                sizeof(_PATH_SYS_DEVBLOCK "/") - 1);
 913
 914         while ((sub = get_subsystem(devchain, subbuf, sizeof(subbuf)))) {
 915                 rc = is_hotpluggable_subsystem(sub);
 916                 if (rc) {
 917                         verbose(_("%s: connected by hotplug subsystem: %s"),
 918                                 device, sub);
 919                         break;
 920                 }
 921         }
 922
 923 done:
 924         sysfs_deinit(&cxt);
 925         return rc;
 926 }
 927
 928
 929 /* handle -x option */
 930 static void set_device_speed(char *name)
 931 {
 932         int fd;
 933
 934         if (!x_option)
 935                 return;
 936
 937         if (x_arg == 0)
 938                 verbose(_("setting CD-ROM speed to auto"));
 939         else
 940                 verbose(_("setting CD-ROM speed to %ldX"), x_arg);
 941
 942         fd = open_device(name);
 943         select_speed(fd, x_arg);
 944         exit(EXIT_SUCCESS);
 945 }
 946
 947
 948 /* main program */
 949 int main(int argc, char **argv)
 950 {
 951         char *device = NULL;
 952         char *disk = NULL;
 953         char *mountpoint = NULL;
 954         int worked = 0;    /* set to 1 when successfully ejected */
 955         int fd;            /* file descriptor for device */
 956
 957         setlocale(LC_ALL,"");
 958         bindtextdomain(PACKAGE, LOCALEDIR);
 959         textdomain(PACKAGE);
 960         atexit(close_stdout);
 961
 962         /* parse the command line arguments */
 963         parse_args(argc, argv, &device);
 964
 965         /* handle -d option */
 966         if (d_option) {
 967                 info(_("default device: `%s'"), EJECT_DEFAULT_DEVICE);
 968                 return EXIT_SUCCESS;
 969         }
 970
 971         if (!device) {
 972                 device = mnt_resolve_path(EJECT_DEFAULT_DEVICE, NULL);
 973                 verbose(_("using default device `%s'"), device);
 974         } else {
 975                 char *p;
 976
 977                 if (device[strlen(device)-1] == '/')
 978                         device[strlen(device)-1] = '\0';
 979
 980                 /* figure out full device or mount point name */
 981                 p = find_device(device);
 982                 if (p)
 983                         free(device);
 984                 else
 985                         p = device;
 986
 987                 device = mnt_resolve_spec(p, NULL);
 988                 free(p);
 989         }
 990
 991         if (!device)
 992                 errx(EXIT_FAILURE, _("%s: unable to find device"), device);
 993
 994         verbose(_("device name is `%s'"), device);
 995
 996         device_get_mountpoint(&device, &mountpoint);
 997         if (mountpoint)
 998                 verbose(_("%s: mounted on %s"), device, mountpoint);
 999         else
1000                 verbose(_("%s: not mounted"), device);
1001
1002         disk = get_disk_devname(device);
1003         if (disk) {
1004                 verbose(_("%s: disc device: %s (disk device will be used for eject)"), device, disk);
1005                 free(device);
1006                 device = disk;
1007                 disk = NULL;
1008         } else {
1009                 struct stat st;
1010
1011                 if (stat(device, &st) != 0 || !S_ISBLK(st.st_mode))
1012                         errx(EXIT_FAILURE, _("%s: not found mountpoint or device "
1013                                         "with the given name"), device);
1014
1015                 verbose(_("%s: is whole-disk device"), device);
1016         }
1017
1018         if (F_option == 0 && is_hotpluggable(device) == 0)
1019                 errx(EXIT_FAILURE, _("%s: is not hot-pluggable device"), device);
1020
1021         /* handle -n option */
1022         if (n_option) {
1023                 info(_("device is `%s'"), device);
1024                 verbose(_("exiting due to -n/--noop option"));
1025                 return EXIT_SUCCESS;
1026         }
1027
1028         /* handle -i option */
1029         if (i_option) {
1030                 fd = open_device(device);
1031                 manual_eject(fd, i_arg);
1032                 return EXIT_SUCCESS;
1033         }
1034
1035         /* handle -a option */
1036         if (a_option) {
1037                 if (a_arg)
1038                         verbose(_("%s: enabling auto-eject mode"), device);
1039                 else
1040                         verbose(_("%s: disabling auto-eject mode"), device);
1041                 fd = open_device(device);
1042                 auto_eject(fd, a_arg);
1043                 return EXIT_SUCCESS;
1044         }
1045
1046         /* handle -t option */
1047         if (t_option) {
1048                 verbose(_("%s: closing tray"), device);
1049                 fd = open_device(device);
1050                 close_tray(fd);
1051                 set_device_speed(device);
1052                 return EXIT_SUCCESS;
1053         }
1054
1055         /* handle -T option */
1056         if (T_option) {
1057                 verbose(_("%s: toggling tray"), device);
1058                 fd = open_device(device);
1059                 toggle_tray(fd);
1060                 set_device_speed(device);
1061                 return EXIT_SUCCESS;
1062         }
1063
1064         /* handle -X option */
1065         if (X_option) {
1066                 verbose(_("%s: listing CD-ROM speed"), device);
1067                 fd = open_device(device);
1068                 list_speeds(device, fd);
1069                 return EXIT_SUCCESS;
1070         }
1071
1072         /* handle -x option only */
1073         if (!c_option)
1074                 set_device_speed(device);
1075
1076
1077         /*
1078          * Unmount all partitions if -m is not specified; or umount given
1079          * mountpoint if -M is specified, otherwise print error of another
1080          * partition is mounted.
1081          */
1082         if (!m_option) {
1083                 int ct = umount_partitions(device, M_option);
1084
1085                 if (ct == 0 && mountpoint)
1086                         umount_one(mountpoint); /* probably whole-device */
1087
1088                 if (M_option) {
1089                         if (ct == 1 && mountpoint)
1090                                 umount_one(mountpoint);
1091                         else if (ct)
1092                                 errx(EXIT_FAILURE, _("error: %s: device in use"), device);
1093                 }
1094         }
1095
1096         /* handle -c option */
1097         if (c_option) {
1098                 verbose(_("%s: selecting CD-ROM disc #%ld"), device, c_arg);
1099                 fd = open_device(device);
1100                 changer_select(fd, c_arg);
1101                 set_device_speed(device);
1102                 return EXIT_SUCCESS;
1103         }
1104
1105         /* if user did not specify type of eject, try all four methods */
1106         if (r_option + s_option + f_option + q_option == 0)
1107                 r_option = s_option = f_option = q_option = 1;
1108
1109         /* open device */
1110         fd = open_device(device);
1111
1112         /* try various methods of ejecting until it works */
1113         if (r_option) {
1114                 verbose(_("%s: trying to eject using CD-ROM eject command"), device);
1115                 worked = eject_cdrom(fd);
1116                 verbose(worked ? _("CD-ROM eject command succeeded") :
1117                                  _("CD-ROM eject command failed"));
1118         }
1119
1120         if (s_option && !worked) {
1121                 verbose(_("%s: trying to eject using SCSI commands"), device);
1122                 worked = eject_scsi(fd);
1123                 verbose(worked ? _("SCSI eject succeeded") :
1124                                  _("SCSI eject failed"));
1125         }
1126
1127         if (f_option && !worked) {
1128                 verbose(_("%s: trying to eject using floppy eject command"), device);
1129                 worked = eject_floppy(fd);
1130                 verbose(worked ? _("floppy eject command succeeded") :
1131                                  _("floppy eject command failed"));
1132         }
1133
1134         if (q_option && !worked) {
1135                 verbose(_("%s: trying to eject using tape offline command"), device);
1136                 worked = eject_tape(fd);
1137                 verbose(worked ? _("tape offline command succeeded") :
1138                                  _("tape offline command failed"));
1139         }
1140
1141         if (!worked)
1142                 errx(EXIT_FAILURE, _("unable to eject"));
1143
1144         /* cleanup */
1145         close(fd);
1146         free(device);
1147         free(mountpoint);
1148
1149         mnt_free_table(mtab);
1150         mnt_free_cache(cache);
1151
1152         return EXIT_SUCCESS;
1153 }