OS - FUSE(access)

int FS_access(const char *path, int mask)
{
    _debug_print_FS("\n%d FS : Called access  | path : %s\n", FS_COUNT++, path);

    struct fuse_context *context = (struct fuse_context *)fuse_get_context();
    struct memcached *m = (struct memcached *)(context->private_data);

    mm_data_info info;
    memcached_get(m, path, &info);
    if (info.value == NULL)
        return -ENOENT;

    gid_t cur_gid;
    uid_t cur_uid;
    mode_t mode;

    if (info.flags & MM_DIR) // check if directory
    {
        dir d;
        memcpy(&d, info.value, sizeof(struct dir));
        mode = d.mode;
        cur_gid = d.gid;
        cur_uid = d.uid;
    }
    else if (info.flags & MM_FIL) // check if file
    {
        file f;
        memcpy(&f, info.value, sizeof(struct file));
        mode = f.mode;
        cur_gid = f.gid;
        cur_uid = f.uid;
    }
    else //error
        return -ENOENT;

    int R_PERM, W_PERM, X_PERM;

    if (cur_uid == context->uid) // is user
    {
        R_PERM = S_IRUSR; /* R for owner */
        W_PERM = S_IWUSR; /* W for owner */
        X_PERM = S_IXUSR; /* X for owner */
    }
    else if (cur_gid == context->gid) // is gid
    {
        R_PERM = S_IRGRP; /* R for group */
        W_PERM = S_IWGRP; /* W for group */
        X_PERM = S_IXGRP; /* X for group */
    }
    else // is other
    {
        R_PERM = S_IROTH; /* R for other */
        W_PERM = S_IWOTH; /* W for other */
        X_PERM = S_IXOTH; /* X for other */
    }

    if ((mask & R_OK) && (mode & R_PERM)) /* (wants to write) and (has permission) */
        return 0;

    if ((mask & W_OK) && (mode & W_PERM)) /* (wants to read) and (has permission) */
        return 0;

    if ((mask & X_OK) && (mode & X_PERM)) /* (wants to execute) and (has permission) */
        return 0;

    return -EACCES;
}