source: branches/samba-3.5.x/lib/replace/test/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

#ifdef _WIN32
#define mkdir(d,m) _mkdir(d)
#endif

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

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

        if (system("rm -rf " TESTDIR) == -1) {
                FAILED("system");
        }

        return test_readdir_os2_delete_ret;
}