C++ request_send函数代码示例

static int request_io(struct knot_requestor *req, struct knot_request *last,
                      struct timeval *timeout)
{
	int ret = KNOT_EOK;
	knot_pkt_t *query = last->query;
	knot_pkt_t *resp = last->resp;

	/* Data to be sent. */
	if (req->overlay.state == KNOT_STATE_PRODUCE) {

		/* Process query and send it out. */
		knot_overlay_produce(&req->overlay, query);

		if (req->overlay.state == KNOT_STATE_CONSUME) {
			ret = request_send(last, timeout);
			if (ret != KNOT_EOK) {
				return ret;
			}
		}
	}

	/* Data to be read. */
	if (req->overlay.state == KNOT_STATE_CONSUME) {
		/* Read answer and process it. */
		ret = request_recv(last, timeout);
		if (ret < 0) {
			return ret;
		}

		(void) knot_pkt_parse(resp, 0);
		knot_overlay_consume(&req->overlay, resp);
	}

	return KNOT_EOK;
}

static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
{
	struct fuse_conn *fc = get_fuse_conn_super(sb);
	struct fuse_req *req;
	struct fuse_statfs_out outarg;
	int err;

        req = fuse_get_request(fc);
	if (!req)
		return -EINTR;

	memset(&outarg, 0, sizeof(outarg));
	req->in.numargs = 0;
	req->in.h.opcode = FUSE_STATFS;
	req->out.numargs = 1;
	req->out.args[0].size =
		fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
	req->out.args[0].value = &outarg;
	request_send(fc, req);
	err = req->out.h.error;
	if (!err)
		convert_fuse_statfs(buf, &outarg.st);
	fuse_put_request(fc, req);
	return err;
}

void mwServiceStorage_save(struct mwServiceStorage *srvc,
			   struct mwStorageUnit *item,
			   mwStorageCallback cb,
			   gpointer data, GDestroyNotify d_free) {

  /* - construct a request
     - put request at end of pending
     - if channel is open and connected
       - compose the save message
       - send message
       - set request to sent
     - else
       - start service
  */

  struct mwStorageReq *req;

  req = request_new(srvc, item, cb, data, d_free);
  req->action = action_save;

  srvc->pending = g_list_append(srvc->pending, req);

  if(MW_SERVICE_IS_STARTED(MW_SERVICE(srvc)))
    request_send(srvc->channel, req);
}

static void recv_channelAccept(struct mwService *srvc,
			       struct mwChannel *chan,
			       struct mwMsgChannelAccept *msg) {

  // `msg` unused
  (void)msg;
 
  struct mwServiceStorage *srvc_stor;
  GList *l;

  g_return_if_fail(srvc != NULL);
  srvc_stor = (struct mwServiceStorage *) srvc;

  g_return_if_fail(chan != NULL);
  g_return_if_fail(chan == srvc_stor->channel);

  /* send all pending requests */
  for(l = srvc_stor->pending; l; l = l->next) {
    struct mwStorageReq *req = l->data;

    if(req->action == action_save || req->action == action_load) {
      request_send(chan, req);
    }
  }

  mwService_started(srvc);
}

/*
 * Set attributes, and at the same time refresh them.
 *
 * Truncation is slightly complicated, because the 'truncate' request
 * may fail, in which case we don't want to touch the mapping.
 * vmtruncate() doesn't allow for this case, so do the rlimit checking
 * and the actual truncation by hand.
 */
static int fuse_setattr(struct dentry *entry, struct iattr *attr)
{
	struct inode *inode = entry->d_inode;
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_inode *fi = get_fuse_inode(inode);
	struct fuse_req *req;
	struct fuse_setattr_in inarg;
	struct fuse_attr_out outarg;
	int err;
	int is_truncate = 0;

	if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
		err = inode_change_ok(inode, attr);
		if (err)
			return err;
	}

	if (attr->ia_valid & ATTR_SIZE) {
		unsigned long limit;
		is_truncate = 1;
		limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
		if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) {
			send_sig(SIGXFSZ, current, 0);
			return -EFBIG;
		}
	}

	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);

	memset(&inarg, 0, sizeof(inarg));
	iattr_to_fattr(attr, &inarg);
	req->in.h.opcode = FUSE_SETATTR;
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
	req->out.numargs = 1;
	req->out.args[0].size = sizeof(outarg);
	req->out.args[0].value = &outarg;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
		if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
			make_bad_inode(inode);
			err = -EIO;
		} else {
			if (is_truncate)
				fuse_vmtruncate(inode, outarg.attr.size);
			fuse_change_attributes(inode, &outarg.attr);
			fi->i_time = time_to_jiffies(outarg.attr_valid,
						     outarg.attr_valid_nsec);
		}
	} else if (err == -EINTR)
		fuse_invalidate_attr(inode);

	return err;
}

static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	struct fuse_conn *fc = get_fuse_conn_super(sb);
	struct fuse_req *req;
	struct fuse_statfs_out outarg;
	int err;

	if (!fuse_allow_task(fc, current)) {
		buf->f_type = FUSE_SUPER_MAGIC;
		return 0;
	}

	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);

	memset(&outarg, 0, sizeof(outarg));
	req->in.numargs = 0;
	req->in.h.opcode = FUSE_STATFS;
	req->in.h.nodeid = get_node_id(dentry->d_inode);
	req->out.numargs = 1;
	req->out.args[0].size =
		fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
	req->out.args[0].value = &outarg;
	request_send(fc, req);
	err = req->out.h.error;
	if (!err)
		convert_fuse_statfs(buf, &outarg.st);
	fuse_put_request(fc, req);
	return err;
}

static int fuse_rmdir(struct inode *dir, struct dentry *entry)
{
	int err;
	struct fuse_conn *fc = get_fuse_conn(dir);
	struct fuse_req *req = fuse_get_request(fc);
	if (!req)
		return -EINTR;

	req->in.h.opcode = FUSE_RMDIR;
	req->in.h.nodeid = get_node_id(dir);
	req->inode = dir;
	req->in.numargs = 1;
	req->in.args[0].size = entry->d_name.len + 1;
	req->in.args[0].value = entry->d_name.name;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err) {
		entry->d_inode->i_nlink = 0;
		fuse_invalidate_attr(dir);
		fuse_invalidate_entry_cache(entry);
	} else if (err == -EINTR)
		fuse_invalidate_entry(entry);
	return err;
}

static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
				  struct nameidata *nd)
{
	int err;
	struct fuse_entry_out outarg;
	struct inode *inode = NULL;
#if !defined(FUSE_MAINLINE) && defined(KERNEL_2_6)
	struct dentry *newent;
#endif
	struct fuse_conn *fc = get_fuse_conn(dir);
	struct fuse_req *req;

	if (entry->d_name.len > FUSE_NAME_MAX)
		return ERR_PTR(-ENAMETOOLONG);

	req = fuse_get_request(fc);
	if (!req)
		return ERR_PTR(-EINTR);

	fuse_lookup_init(req, dir, entry, &outarg);
	request_send(fc, req);
	err = req->out.h.error;
	/* Zero nodeid is same as -ENOENT, but with valid timeout */
	if (!err && outarg.nodeid &&
	    (invalid_nodeid(outarg.nodeid) || !valid_mode(outarg.attr.mode)))
		err = -EIO;
	if (!err && outarg.nodeid) {
		inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
				  &outarg.attr);
		if (!inode) {
			fuse_send_forget(fc, req, outarg.nodeid, 1);
			return ERR_PTR(-ENOMEM);
		}
	}
	fuse_put_request(fc, req);
	if (err && err != -ENOENT)
		return ERR_PTR(err);

	if (inode && dir_alias(inode)) {
		iput(inode);
		return ERR_PTR(-EIO);
	}
#if defined(FUSE_MAINLINE) || !defined(KERNEL_2_6)
	d_add(entry, inode);
#else
	newent = d_splice_alias(inode, entry);
	entry = newent ? newent : entry;
#endif
	entry->d_op = &fuse_dentry_operations;
	if (!err)
		fuse_change_timeout(entry, &outarg);
	else
		fuse_invalidate_entry_cache(entry);
#if defined(FUSE_MAINLINE) || !defined(KERNEL_2_6)
	return NULL;
#else
	return newent;
#endif
}

int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
                     struct fuse_entry_out *outarg, struct inode **inode)
{
    struct fuse_conn *fc = get_fuse_conn_super(sb);
    struct fuse_req *req;
    struct fuse_req *forget_req;
    u64 attr_version;
    int err;

    *inode = NULL;
    err = -ENAMETOOLONG;
    if (name->len > FUSE_NAME_MAX)
        goto out;

    req = fuse_get_req(fc);
    err = PTR_ERR(req);
    if (IS_ERR(req))
        goto out;

    forget_req = fuse_get_req(fc);
    err = PTR_ERR(forget_req);
    if (IS_ERR(forget_req)) {
        fuse_put_request(fc, req);
        goto out;
    }

    attr_version = fuse_get_attr_version(fc);

    fuse_lookup_init(fc, req, nodeid, name, outarg);
    request_send(fc, req);
    err = req->out.h.error;
    fuse_put_request(fc, req);
    /* Zero nodeid is same as -ENOENT, but with valid timeout */
    if (err || !outarg->nodeid)
        goto out_put_forget;

    err = -EIO;
    if (!outarg->nodeid)
        goto out_put_forget;
    if (!fuse_valid_type(outarg->attr.mode))
        goto out_put_forget;

    *inode = fuse_iget(sb, outarg->nodeid, outarg->generation,
                       &outarg->attr, entry_attr_timeout(outarg),
                       attr_version);
    err = -ENOMEM;
    if (!*inode) {
        fuse_send_forget(fc, forget_req, outarg->nodeid, 1);
        goto out;
    }
    err = 0;

out_put_forget:
    fuse_put_request(fc, forget_req);
out:
    return err;
}

/*
 * Check whether the dentry is still valid
 *
 * If the entry validity timeout has expired and the dentry is
 * positive, try to redo the lookup.  If the lookup results in a
 * different inode, then let the VFS invalidate the dentry and redo
 * the lookup once more.  If the lookup results in the same inode,
 * then refresh the attributes, timeouts and mark the dentry valid.
 */
static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
{
	struct inode *inode = entry->d_inode;

	if (inode && is_bad_inode(inode))
		return 0;
	else if (fuse_dentry_time(entry) < get_jiffies_64()) {
		int err;
		struct fuse_entry_out outarg;
		struct fuse_conn *fc;
		struct fuse_req *req;
		struct fuse_req *forget_req;

		/* Doesn't hurt to "reset" the validity timeout */
		fuse_invalidate_entry_cache(entry);

		/* For negative dentries, always do a fresh lookup */
		if (!inode)
			return 0;

		fc = get_fuse_conn(inode);
		req = fuse_get_req(fc);
		if (IS_ERR(req))
			return 0;

		forget_req = fuse_get_req(fc);
		if (IS_ERR(forget_req)) {
			fuse_put_request(fc, req);
			return 0;
		}

		fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg);
		request_send(fc, req);
		err = req->out.h.error;
		fuse_put_request(fc, req);
		/* Zero nodeid is same as -ENOENT */
		if (!err && !outarg.nodeid)
			err = -ENOENT;
		if (!err) {
			struct fuse_inode *fi = get_fuse_inode(inode);
			if (outarg.nodeid != get_node_id(inode)) {
				fuse_send_forget(fc, forget_req,
						 outarg.nodeid, 1);
				return 0;
			}
			fi->nlookup ++;
		}
		fuse_put_request(fc, forget_req);
		if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
			return 0;

		fuse_change_attributes(inode, &outarg.attr);
		fuse_change_timeout(entry, &outarg);
	}
	return 1;
}

static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
				  struct nameidata *nd)
{
	int err;
	struct fuse_entry_out outarg;
	struct inode *inode = NULL;
	struct fuse_conn *fc = get_fuse_conn(dir);
	struct fuse_req *req;
	struct fuse_req *forget_req;

	if (entry->d_name.len > FUSE_NAME_MAX)
		return ERR_PTR(-ENAMETOOLONG);

	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return ERR_PTR(PTR_ERR(req));

	forget_req = fuse_get_req(fc);
	if (IS_ERR(forget_req)) {
		fuse_put_request(fc, req);
		return ERR_PTR(PTR_ERR(forget_req));
	}

	fuse_lookup_init(req, dir, entry, &outarg);
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	/* Zero nodeid is same as -ENOENT, but with valid timeout */
	if (!err && outarg.nodeid &&
	    (invalid_nodeid(outarg.nodeid) || !valid_mode(outarg.attr.mode)))
		err = -EIO;
	if (!err && outarg.nodeid) {
		inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
				  &outarg.attr);
		if (!inode) {
			fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
			return ERR_PTR(-ENOMEM);
		}
	}
	fuse_put_request(fc, forget_req);
	if (err && err != -ENOENT)
		return ERR_PTR(err);

	if (inode && dir_alias(inode)) {
		iput(inode);
		return ERR_PTR(-EIO);
	}
	d_add(entry, inode);
	entry->d_op = &fuse_dentry_operations;
	if (!err)
		fuse_change_timeout(entry, &outarg);
	else
		fuse_invalidate_entry_cache(entry);
	return NULL;
}

static void fuse_send_destroy(struct fuse_conn *fc)
{
	struct fuse_req *req = fc->destroy_req;
	if (req && fc->conn_init) {
		fc->destroy_req = NULL;
		req->in.h.opcode = FUSE_DESTROY;
		req->force = 1;
		request_send(fc, req);
		fuse_put_request(fc, req);
	}
}

/*
 * Code shared between mknod, mkdir, symlink and link
 */
static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
			    struct inode *dir, struct dentry *entry,
			    int mode)
{
	struct fuse_entry_out outarg;
	struct inode *inode;
	int err;
	struct fuse_req *forget_req;

	forget_req = fuse_get_req(fc);
	if (IS_ERR(forget_req)) {
		fuse_put_request(fc, req);
		return PTR_ERR(forget_req);
	}

	req->in.h.nodeid = get_node_id(dir);
	req->out.numargs = 1;
	req->out.args[0].size = sizeof(outarg);
	req->out.args[0].value = &outarg;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (err)
		goto out_put_forget_req;

	err = -EIO;
	if (invalid_nodeid(outarg.nodeid))
		goto out_put_forget_req;

	if ((outarg.attr.mode ^ mode) & S_IFMT)
		goto out_put_forget_req;

	inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
			  &outarg.attr);
	if (!inode) {
		fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
		return -ENOMEM;
	}
	fuse_put_request(fc, forget_req);

	if (dir_alias(inode)) {
		iput(inode);
		return -EIO;
	}

	d_instantiate(entry, inode);
	fuse_change_timeout(entry, &outarg);
	fuse_invalidate_attr(dir);
	return 0;

 out_put_forget_req:
	fuse_put_request(fc, forget_req);
	return err;
}

static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
			     void *value, size_t size)
{
	struct inode *inode = entry->d_inode;
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_req *req;
	struct fuse_getxattr_in inarg;
	struct fuse_getxattr_out outarg;
	ssize_t ret;

	if (fc->no_getxattr)
		return -EOPNOTSUPP;

	req = fuse_get_request(fc);
	if (!req)
		return -EINTR;

	memset(&inarg, 0, sizeof(inarg));
	inarg.size = size;
	req->in.h.opcode = FUSE_GETXATTR;
	req->in.h.nodeid = get_node_id(inode);
	req->inode = inode;
	req->in.numargs = 2;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
	req->in.args[1].size = strlen(name) + 1;
	req->in.args[1].value = name;
	/* This is really two different operations rolled into one */
	req->out.numargs = 1;
	if (size) {
		req->out.argvar = 1;
		req->out.args[0].size = size;
		req->out.args[0].value = value;
	} else {
		req->out.args[0].size = sizeof(outarg);
		req->out.args[0].value = &outarg;
	}
	request_send(fc, req);
	ret = req->out.h.error;
	if (!ret)
		ret = size ? req->out.args[0].size : outarg.size;
	else {
		if (ret == -ENOSYS) {
			fc->no_getxattr = 1;
			ret = -EOPNOTSUPP;
		}
	}
	fuse_put_request(fc, req);
	return ret;
}

Response *httpclient_send_request(HttpClient *httpClient){
    Request *request = httpClient->request;

    if(request == NULL){
        printf("request must not be null\n");
        return NULL;
    }

    if(request->curl_handle == NULL){
        printf("curl_handle must not be null\n");
        return NULL;
    }

    request_send(request, httpClient);

    return  httpClient->response;
}