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os2_delete.c

/*
  test readdir/unlink pattern that OS/2 uses
  tridge@samba.org July 2005
*/

#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>

#define NUM_FILES 700
#define READDIR_SIZE 100
#define DELETE_SIZE 4

#define TESTDIR "test.dir"

static int test_readdir_os2_delete_ret;

#define FAILED(d) (printf("failure: readdir [\nFailed for %s - %d = %s\n]\n", d, errno, strerror(errno)), test_readdir_os2_delete_ret = 1, 1)

#ifndef MIN
#define MIN(a,b) ((a)<(b)?(a):(b))
#endif

static void cleanup(void)
{
      /* I'm a lazy bastard */
      system("rm -rf " TESTDIR);
      mkdir(TESTDIR, 0700) == 0 || FAILED("mkdir");
}

static void create_files(void)
{
      int i;
      for (i=0;i<NUM_FILES;i++) {
            char fname[40];
            sprintf(fname, TESTDIR "/test%u.txt", i);
            close(open(fname, O_CREAT|O_RDWR, 0600)) == 0 || FAILED("close");
      }
}

static int os2_delete(DIR *d)
{
      off_t offsets[READDIR_SIZE];
      int i, j;
      struct dirent *de;
      char names[READDIR_SIZE][30];

      /* scan, remembering offsets */
      for (i=0, de=readdir(d); 
           de && i < READDIR_SIZE; 
           de=readdir(d), i++) {
            offsets[i] = telldir(d);
            strcpy(names[i], de->d_name);
      }

      if (i == 0) {
            return 0;
      }

      /* delete the first few */
      for (j=0; j<MIN(i, DELETE_SIZE); j++) {
            char fname[40];
            sprintf(fname, TESTDIR "/%s", names[j]);
            unlink(fname) == 0 || FAILED("unlink");
      }

      /* seek to just after the deletion */
      seekdir(d, offsets[j-1]);

      /* return number deleted */
      return j;
}

int test_readdir_os2_delete(void)
{
      int total_deleted = 0;
      DIR *d;
      struct dirent *de;

      test_readdir_os2_delete_ret = 0;

      cleanup();
      create_files();

      d = opendir(TESTDIR "/test0.txt");
      if (d != NULL) FAILED("opendir() on file succeed");
      if (errno != ENOTDIR) FAILED("opendir() on file didn't give ENOTDIR");

      d = opendir(TESTDIR);

      /* skip past . and .. */
      de = readdir(d);
      strcmp(de->d_name, ".") == 0 || FAILED("match .");
      de = readdir(d);
      strcmp(de->d_name, "..") == 0 || FAILED("match ..");

      while (1) {
            int n = os2_delete(d);
            if (n == 0) break;
            total_deleted += n;
      }
      closedir(d);

      fprintf(stderr, "Deleted %d files of %d\n", total_deleted, NUM_FILES);

      rmdir(TESTDIR) == 0 || FAILED("rmdir");

      system("rm -rf " TESTDIR);

      return test_readdir_os2_delete_ret;
}

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