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badblocks.c

/*
 * badblocks.c          - Bad blocks checker
 *
 * Copyright (C) 1992, 1993, 1994  Remy Card <card@masi.ibp.fr>
 *                                 Laboratoire MASI, Institut Blaise Pascal
 *                                 Universite Pierre et Marie Curie (Paris VI)
 *
 * Copyright 1995, 1996, 1997, 1998, 1999 by Theodore Ts'o
 * Copyright 1999 by David Beattie
 *
 * This file is based on the minix file system programs fsck and mkfs
 * written and copyrighted by Linus Torvalds <Linus.Torvalds@cs.helsinki.fi>
 * 
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

/*
 * History:
 * 93/05/26 - Creation from e2fsck
 * 94/02/27 - Made a separate bad blocks checker
 * 99/06/30...99/07/26 - Added non-destructive write-testing,
 *                       configurable blocks-at-once parameter,
 *                 loading of badblocks list to avoid testing
 *                 blocks known to be bad, multiple passes to 
 *                 make sure that no new blocks are added to the
 *                 list.  (Work done by David Beattie)
 */

#include <errno.h>
#include <fcntl.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#else
extern char *optarg;
extern int optind;
#endif
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <setjmp.h>

#include <sys/ioctl.h>
#include <sys/types.h>

#include "et/com_err.h"
#include "ext2fs/ext2_io.h"
#include "ext2fs/ext2_fs.h"
#include "ext2fs/ext2fs.h"
#include "nls-enable.h"

const char * program_name = "badblocks";
const char * done_string = N_("done                        \n");

static int v_flag = 0;              /* verbose */
static int w_flag = 0;              /* do r/w test: 0=no, 1=yes,
                               * 2=non-destructive */
static int s_flag = 0;              /* show progress of test */
static int force = 0;               /* force check of mounted device */

static void usage(void)
{
      fprintf(stderr, _("Usage: %s [-b block_size] [-i input_file] [-o output_file] [-svwnf]\n [-c blocks_at_once] [-p num_passes] device [last_block [start_count]]\n"),
             program_name);
      exit (1);
}

static unsigned long currently_testing = 0;
static unsigned long num_blocks = 0;
static ext2_badblocks_list bb_list = NULL;
static FILE *out;
static blk_t next_bad = 0;
static ext2_badblocks_iterate bb_iter = NULL;

/*
 * This routine reports a new bad block.  If the bad block has already
 * been seen before, then it returns 0; otherwise it returns 1.
 */
static int bb_output (unsigned long bad)
{
      errcode_t errcode;

      if (ext2fs_badblocks_list_test(bb_list, bad))
            return 0;

      fprintf (out, "%lu\n", bad);

      errcode = ext2fs_badblocks_list_add (bb_list, bad);
      if (errcode) {
            com_err (program_name, errcode, "adding to in-memory bad block list");
            exit (1);
      }

      /* kludge:
         increment the iteration through the bb_list if 
         an element was just added before the current iteration
         position.  This should not cause next_bad to change. */
      if (bb_iter && bad < next_bad)
            ext2fs_badblocks_list_iterate (bb_iter, &next_bad);
      return 1;
}

static void print_status(void)
{
      fprintf(stderr, "%9ld/%9ld", currently_testing, num_blocks);
      fprintf(stderr, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
      fflush (stderr);
}

static void alarm_intr(int alnum)
{
      signal (SIGALRM, alarm_intr);
      alarm(1);
      if (!num_blocks)
            return;
      fprintf(stderr, "%9ld/%9ld", currently_testing, num_blocks);
      fprintf(stderr, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
      fflush (stderr);
}

static void *terminate_addr = NULL;

static void terminate_intr(int signo)
{
      if (terminate_addr)
            longjmp(terminate_addr,1);
      exit(1);
}

static void capture_terminate(jmp_buf term_addr)
{
      terminate_addr = term_addr;
      signal (SIGHUP, terminate_intr);
      signal (SIGINT, terminate_intr);
      signal (SIGPIPE, terminate_intr);
      signal (SIGTERM, terminate_intr);
      signal (SIGUSR1, terminate_intr);
      signal (SIGUSR2, terminate_intr);
}

static void uncapture_terminate(void)
{
      terminate_addr = NULL;
      signal (SIGHUP, SIG_DFL);
      signal (SIGINT, SIG_DFL);
      signal (SIGPIPE, SIG_DFL);
      signal (SIGTERM, SIG_DFL);
      signal (SIGUSR1, SIG_DFL);
      signal (SIGUSR2, SIG_DFL);
}

/*
 * Perform a read of a sequence of blocks; return the number of blocks
 *    successfully sequentially read.
 */
static long do_read (int dev, char * buffer, int try, int block_size,
                 unsigned long current_block)
{
      long got;

      if (v_flag > 1)
            print_status();

      /* Seek to the correct loc. */
      if (ext2fs_llseek (dev, (ext2_loff_t) current_block * block_size,
                   SEEK_SET) != (ext2_loff_t) current_block * block_size)
            com_err (program_name, errno, _("during seek"));

      /* Try the read */
      got = read (dev, buffer, try * block_size);
      if (got < 0)
            got = 0;    
      if (got & 511)
            fprintf(stderr, _("Weird value (%ld) in do_read\n"), got);
      got /= block_size;
      return got;
}

/*
 * Perform a write of a sequence of blocks; return the number of blocks
 *    successfully sequentially written.
 */
static long do_write (int dev, char * buffer, int try, int block_size,
                 unsigned long current_block)
{
      long got;

      if (v_flag > 1)
            print_status();

      /* Seek to the correct loc. */
      if (ext2fs_llseek (dev, (ext2_loff_t) current_block * block_size,
                   SEEK_SET) != (ext2_loff_t) current_block * block_size)
            com_err (program_name, errno, _("during seek"));

      /* Try the write */
      got = write (dev, buffer, try * block_size);
      if (got < 0)
            got = 0;    
      if (got & 511)
            fprintf (stderr,
                   "Weird value (%ld) in do_write\n", got);
      got /= block_size;
      return got;
}

static int host_dev;

static void flush_bufs(void)
{
      errcode_t   retval;

      retval = ext2fs_sync_device(host_dev, 1);
      if (retval)
            com_err(program_name, retval, _("during ext2fs_sync_device"));
}

static unsigned int test_ro (int dev, unsigned long last_block,
                       int block_size, unsigned long from_count,
                       unsigned long blocks_at_once)
{
      char * blkbuf;
      int try;
      long got;
      unsigned int bb_count = 0;
      errcode_t errcode;

      errcode = ext2fs_badblocks_list_iterate_begin(bb_list,&bb_iter);
      if (errcode) {
            com_err (program_name, errcode,
                   _("while beginning bad block list iteration"));
            exit (1);
      }
      do {
            ext2fs_badblocks_list_iterate (bb_iter, &next_bad);
      } while (next_bad && next_bad < from_count);

      blkbuf = malloc (blocks_at_once * block_size);
      if (!blkbuf)
      {
            com_err (program_name, ENOMEM, _("while allocating buffers"));
            exit (1);
      }
      flush_bufs();
      if (v_flag) {
          fprintf(stderr, _("Checking for bad blocks in read-only mode\n"));
          fprintf (stderr, _("From block %lu to %lu\n"), from_count,
                 last_block);
      }
      try = blocks_at_once;
      currently_testing = from_count;
      num_blocks = last_block;
      if (s_flag || v_flag > 1) {
            fprintf(stderr,
                  _("Checking for bad blocks (read-only test): "));
            if (v_flag <= 1)
                  alarm_intr(SIGALRM);
      }
      while (currently_testing < last_block)
      {
            if (next_bad) {
                  if (currently_testing == next_bad) {
                        /* fprintf (out, "%lu\n", nextbad); */
                        ext2fs_badblocks_list_iterate (bb_iter, &next_bad);
                        currently_testing++;
                        continue;
                  }
                  else if (currently_testing + try > next_bad)
                        try = next_bad - currently_testing;
            }
            if (currently_testing + try > last_block)
                  try = last_block - currently_testing;
            got = do_read (dev, blkbuf, try, block_size, currently_testing);
            currently_testing += got;
            if (got == try) {
                  try = blocks_at_once;
                  continue;
            }
            else
                  try = 1;
            if (got == 0) {
                  bb_count += bb_output(currently_testing++);
            }
      }
      num_blocks = 0;
      alarm(0);
      if (s_flag || v_flag > 1)
            fprintf(stderr, _(done_string));

      fflush (stderr);
      free (blkbuf);

      ext2fs_badblocks_list_iterate_end(bb_iter);

      return bb_count;
}

static unsigned int test_rw (int dev, unsigned long last_block,
                       int block_size, unsigned long from_count,
                       unsigned long blocks_at_once)
{
      int i;
      char * buffer;
      static unsigned char pattern[] = {0xaa, 0x55, 0xff, 0x00};
      unsigned int bb_count = 0;

      buffer = malloc (2 * block_size);
      if (!buffer)
      {
            com_err (program_name, ENOMEM, _("while allocating buffers"));
            exit (1);
      }

      flush_bufs();

      if (v_flag) {
            fprintf(stderr,
                  _("Checking for bad blocks in read-write mode\n"));
            fprintf(stderr, _("From block %lu to %lu\n"),
                   from_count, last_block);
      }
      for (i = 0; i < sizeof (pattern); i++) {
            memset (buffer, pattern[i], block_size);
            if (s_flag | v_flag)
                  fprintf (stderr, _("Writing pattern 0x%08x: "),
                         *((int *) buffer));
            num_blocks = last_block;
            currently_testing = from_count;
            if (s_flag && v_flag <= 1)
                  alarm_intr(SIGALRM);
            for (;
                 currently_testing < last_block;
                 currently_testing++)
            {
                  if (ext2fs_llseek (dev, (ext2_loff_t) currently_testing *
                               block_size, SEEK_SET) !=
                      (ext2_loff_t) currently_testing * block_size)
                        com_err (program_name, errno,
                               _("during seek on block %d"),
                               currently_testing);
                  if (v_flag > 1)
                        print_status();
                  write (dev, buffer, block_size);
            }
            num_blocks = 0;
            alarm (0);
            if (s_flag | v_flag)
                  fprintf(stderr, _(done_string));
            flush_bufs();
            if (s_flag | v_flag)
                  fprintf (stderr, _("Reading and comparing: "));
            num_blocks = last_block;
            currently_testing = from_count;
            if (s_flag && v_flag <= 1)
                  alarm_intr(SIGALRM);
            for (;
                 currently_testing < last_block;
                 currently_testing++)
            {
                  if (ext2fs_llseek (dev, (ext2_loff_t) currently_testing *
                               block_size, SEEK_SET) !=
                      (ext2_loff_t) currently_testing * block_size)
                        com_err (program_name, errno,
                               _("during seek on block %d"),
                               currently_testing);
                  if (v_flag > 1)
                        print_status();
                  if ((read (dev, buffer + block_size, block_size) 
                       != block_size) ||
                      memcmp(buffer, buffer + block_size, block_size))
                        bb_count += bb_output(currently_testing);
            }
            num_blocks = 0;
            alarm (0);
            if (s_flag | v_flag)
                  fprintf(stderr, _(done_string));
            flush_bufs();
      }

      return bb_count;
}

struct saved_blk_record {
      blk_t block;
      int   num;
};

static unsigned int test_nd (int dev, unsigned long last_block,
                       int block_size, unsigned long from_count,
                       unsigned long blocks_at_once)
{
      char *blkbuf, *save_ptr, *test_ptr, *read_ptr;
      char * ptr;
      int try, i;
      long got, used2, written, save_currently_testing;
      struct saved_blk_record *test_record;
      /* This is static to prevent being clobbered by the longjmp */
      static int num_saved;
      jmp_buf terminate_env;
      errcode_t errcode;
      long buf_used;
      unsigned int bb_count;

      errcode = ext2fs_badblocks_list_iterate_begin(bb_list,&bb_iter);
      if (errcode) {
            com_err (program_name, errcode,
                   _("while beginning bad block list iteration"));
            exit (1);
      }
      do {
            ext2fs_badblocks_list_iterate (bb_iter, &next_bad);
      } while (next_bad && next_bad < from_count);

      blkbuf = malloc (3 * blocks_at_once * block_size);
      test_record = malloc (blocks_at_once*sizeof(struct saved_blk_record));
      if (!blkbuf || !test_record) {
            com_err(program_name, ENOMEM, _("while allocating buffers"));
            exit (1);
      }
      num_saved = 0;

      /* inititalize the test data randomly: */
      if (v_flag) {
            fprintf (stderr, _("Initializing random test data\n"));
      }
      for(ptr = blkbuf + blocks_at_once * block_size;
          ptr < blkbuf + 2 * blocks_at_once * block_size;
          ++ptr) {
            (*ptr) = random() % (1 << sizeof(char));
      }

      flush_bufs();
      if (v_flag) {
          fprintf (stderr,
                 _("Checking for bad blocks in non-destructive read-write mode\n"));
          fprintf (stderr, _("From block %lu to %lu\n"), from_count, last_block);
      }
      if (s_flag || v_flag > 1) {
            fprintf(stderr, _("Checking for bad blocks (non-destructive read-write test): "));
            if (v_flag <= 1)
                  alarm_intr(SIGALRM);
      }
      if (setjmp(terminate_env)) {
            /*
             * Abnormal termination by a signal is handled here.
             */
            signal (SIGALRM, SIG_IGN);
            fprintf(stderr, _("\nInterrupt caught, cleaning up\n"));

            save_ptr = blkbuf;
            for (i=0; i < num_saved; i++) {
                  do_write(dev, save_ptr, test_record[i].num,
                         block_size, test_record[i].block);
                  save_ptr += test_record[i].num * block_size;
            }
            fflush (out);
            exit(1);
      }
      
      /* set up abend handler */
      capture_terminate(terminate_env);

      buf_used = 0;
      bb_count = 0;
      save_ptr = blkbuf;
      test_ptr = blkbuf + (blocks_at_once * block_size);
      currently_testing = from_count;
      num_blocks = last_block;

      while (currently_testing < last_block) {
            try = blocks_at_once - buf_used;
            if (next_bad) {
                  if (currently_testing == next_bad) {
                        /* fprintf (out, "%lu\n", nextbad); */
                        ext2fs_badblocks_list_iterate (bb_iter, &next_bad);
                        currently_testing++;
                        goto check_for_more;
                  }
                  else if (currently_testing + try > next_bad)
                        try = next_bad - currently_testing;
            }
            if (currently_testing + try > last_block)
                  try = last_block - currently_testing;
            got = do_read (dev, save_ptr, try, block_size,
                         currently_testing);
            if (got == 0) {
                  /* First block must have been bad. */
                  bb_count += bb_output(currently_testing++);
                  goto check_for_more;
            }

            /*
             * Note the fact that we've saved this much data
             * *before* we overwrite it with test data
             */
            test_record[num_saved].block = currently_testing;
            test_record[num_saved].num = got;
            num_saved++;

            /* Write the test data */
            written = do_write (dev, test_ptr, got, block_size,
                            currently_testing);
            if (written != got)
                  com_err (program_name, errno,
                         _("during test data write, block %lu"),
                         currently_testing + written);

            buf_used += got;
            save_ptr += got * block_size;
            test_ptr += got * block_size;
            currently_testing += got;
            if (got != try)
                  bb_count += bb_output(currently_testing++);

      check_for_more:
            /*
             * If there's room for more blocks to be tested this
             * around, and we're not done yet testing the disk, go
             * back and get some more blocks.
             */
            if ((buf_used != blocks_at_once) &&
                (currently_testing < last_block))
                  continue;

            flush_bufs();
            save_currently_testing = currently_testing;

            /*
             * for each contiguous block that we read into the
             * buffer (and wrote test data into afterwards), read
             * it back (looping if necessary, to get past newly
             * discovered unreadable blocks, of which there should
             * be none, but with a hard drive which is unreliable,
             * it has happened), and compare with the test data
             * that was written; output to the bad block list if
             * it doesn't match.
             */
            used2 = 0;
            save_ptr = blkbuf;
            test_ptr = blkbuf + (blocks_at_once * block_size);
            read_ptr = blkbuf + (2 * blocks_at_once * block_size);
            try = 0;

            while (1) {
                  if (try == 0) {
                        if (used2 >= num_saved)
                              break;
                        currently_testing = test_record[used2].block;
                        try = test_record[used2].num;
                        used2++;
                  }
                        
                  got = do_read (dev, read_ptr, try,
                               block_size, currently_testing);

                  /* test the comparison between all the
                     blocks successfully read  */
                  for (i = 0; i < got; ++i)
                        if (memcmp (test_ptr+i*block_size,
                                  read_ptr+i*block_size, block_size))
                              bb_count += bb_output(currently_testing + i);
                  if (got < try) {
                        bb_count += bb_output(currently_testing + got);
                        got++;
                  }
                              
                  /* when done, write back original data */
                  do_write (dev, save_ptr, got, block_size,
                          currently_testing);

                  currently_testing += got;
                  save_ptr += got * block_size;
                  test_ptr += got * block_size;
                  read_ptr += got * block_size;
                  try -= got;
            }

            /* empty the buffer so it can be reused */
            num_saved = 0;
            buf_used = 0;
            save_ptr = blkbuf;
            test_ptr = blkbuf + (blocks_at_once * block_size);
            currently_testing = save_currently_testing;
      }
      num_blocks = 0;
      alarm(0);
      uncapture_terminate();
      if (s_flag || v_flag > 1)
            fprintf(stderr, _(done_string));

      fflush(stderr);
      free(blkbuf);
      free(test_record);

      ext2fs_badblocks_list_iterate_end(bb_iter);

      return bb_count;
}

static void check_mount(char *device_name)
{
      errcode_t   retval;
      int         mount_flags;

      retval = ext2fs_check_if_mounted(device_name, &mount_flags);
      if (retval) {
            com_err("ext2fs_check_if_mount", retval,
                  _("while determining whether %s is mounted."),
                  device_name);
            return;
      }
      if (!(mount_flags & EXT2_MF_MOUNTED))
            return;

      fprintf(stderr, _("%s is mounted; "), device_name);
      if (force) {
            fprintf(stderr, _("badblocks forced anyway.  "
                  "Hope /etc/mtab is incorrect.\n"));
            return;
      }
      fprintf(stderr, _("it's not safe to run badblocks!\n"));
      exit(1);
}


int main (int argc, char ** argv)
{
      int c;
      char * tmp;
      char * device_name;
      char * host_device_name = NULL;
      char * input_file = NULL;
      char * output_file = NULL;
      FILE * in = NULL;
      int block_size = 1024;
      unsigned long blocks_at_once = 16;
      blk_t last_block, from_count;
      int num_passes = 0;
      int passes_clean = 0;
      int dev;
      errcode_t errcode;
      unsigned int (*test_func)(int, unsigned long,
                          int, unsigned long,
                          unsigned long);

      setbuf(stdout, NULL);
      setbuf(stderr, NULL);
#ifdef ENABLE_NLS
      setlocale(LC_MESSAGES, "");
      setlocale(LC_CTYPE, "");
      bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
      textdomain(NLS_CAT_NAME);
#endif
      test_func = test_ro;

      if (argc && *argv)
            program_name = *argv;
      while ((c = getopt (argc, argv, "b:fi:o:svwnc:p:h:")) != EOF) {
            switch (c) {
            case 'b':
                  block_size = strtoul (optarg, &tmp, 0);
                  if (*tmp || block_size > 4096) {
                        com_err (program_name, 0,
                               _("bad block size - %s"), optarg);
                        exit (1);
                  }
                  break;
            case 'f':
                  force++;
                  break;
            case 'i':
                  input_file = optarg;
                  break;
            case 'o':
                  output_file = optarg;
                  break;
            case 's':
                  s_flag = 1;
                  break;
            case 'v':
                  v_flag++;
                  break;
            case 'w':
                  if (w_flag)
                        usage();
                  test_func = test_rw;
                  w_flag = 1;
                  break;
            case 'n':
                  if (w_flag)
                        usage();
                  test_func = test_nd;
                  w_flag = 2;
                  break;
            case 'c':
                  blocks_at_once = strtoul (optarg, &tmp, 0);
                  if (*tmp) {
                        com_err (program_name, 0,
                               "bad simultaneous block count - %s", optarg);
                        exit (1);
                  }
                  break;
            case 'p':
                  num_passes = strtoul (optarg, &tmp, 0);
                  if (*tmp) {
                        com_err (program_name, 0,
                            "bad number of clean passes - %s", optarg);
                        exit (1);
                  }
                  break;
            case 'h':
                  host_device_name = optarg;
                  break;
            default:
                  usage();
            }
      }
      if (optind > argc - 1)
            usage();
      device_name = argv[optind++];
      if (optind > argc - 1) {
            errcode = ext2fs_get_device_size(device_name,
                                     block_size,
                                     &last_block);
            if (errcode == EXT2_ET_UNIMPLEMENTED) {
                  com_err(program_name, 0,
                        _("Couldn't determine device size; you "
                          "must specify\nthe size manually\n"));
                  exit(1);
            }
            if (errcode) {
                  com_err(program_name, errcode,
                        _("while trying to determine device size"));
                  exit(1);
            }
      } else {
            last_block = strtoul (argv[optind], &tmp, 0);
            if (*tmp) {
                  com_err (program_name, 0, _("bad blocks count - %s"),
                         argv[optind]);
                  exit (1);
            }
            optind++;
      }
      if (optind <= argc-1) {
            from_count = strtoul (argv[optind], &tmp, 0);
            if (*tmp) {
                  com_err (program_name, 0, _("bad starting block - %s"),
                         argv[optind]);
                  exit (1);
            }
      } else from_count = 0;
      if (from_count >= last_block) {
          com_err (program_name, 0, _("bad blocks range: %lu-%lu"),
                 from_count, last_block);
          exit (1);
      }
      if (w_flag)
            check_mount(device_name);
      
      dev = open (device_name, O_RDWR);
      if ((dev == -1) && ((errno == EPERM) || (errno == EACCES)) &&
          (w_flag == 0))
            dev = open(device_name, O_RDONLY);
      if (dev == -1) {
            com_err (program_name, errno, _("while trying to open %s"),
                   device_name);
            exit (1);
      }
      if (host_device_name) {
            host_dev = open (host_device_name, O_RDWR);
            if ((host_dev == -1) &&
                ((errno == EPERM) || (errno == EACCES)))
                  host_dev = open(host_device_name, O_RDONLY);
            if (host_dev == -1) {
                  com_err (program_name, errno,
                         _("while trying to open %s"),
                         host_device_name);
                  exit (1);
            }
      } else
            host_dev = dev;
      if (input_file)
            if (strcmp (input_file, "-") == 0)
                  in = stdin;
            else {
                  in = fopen (input_file, "r");
                  if (in == NULL)
                  {
                        com_err (program_name, errno,
                               _("while trying to open %s"),
                               input_file);
                        exit (1);
                  }
            }
      if (output_file && strcmp (output_file, "-") != 0)
      {
            out = fopen (output_file, "w");
            if (out == NULL)
            {
                  com_err (program_name, errno,
                         _("while trying to open %s"),
                         output_file);
                  exit (1);
            }
      }
      else
            out = stdout;

      errcode = ext2fs_badblocks_list_create(&bb_list,0);
      if (errcode) {
            com_err (program_name, errcode,
                   _("creating in-memory bad blocks list"));
            exit (1);
      }

      if (in) {
            for(;;) {
                  switch(fscanf (in, "%u\n", &next_bad)) {
                        case 0:
                              com_err (program_name, 0, "input file - bad format");
                              exit (1);
                        case EOF:
                              break;
                        default:
                              errcode = ext2fs_badblocks_list_add(bb_list,next_bad);
                              if (errcode) {
                                    com_err (program_name, errcode, _("adding to in-memory bad block list"));
                                    exit (1);
                              }
                              continue;
                  }
                  break;
            }

            if (in != stdin)
                  fclose (in);
      }

      do {
            unsigned int bb_count;

            bb_count = test_func(dev, last_block, block_size,
                             from_count, blocks_at_once);
            if (bb_count)
                  passes_clean = 0;
            else
                  ++passes_clean;
            
            if (v_flag)
                  fprintf(stderr,
                        _("Pass completed, %u bad blocks found.\n"), 
                        bb_count);

      } while (passes_clean < num_passes);

      close (dev);
      if (out != stdout)
            fclose (out);
      return 0;
}


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