C++服务器使用poll(）没有响应

我正在学习Bgnet指南中的C++和套接字。我做了一个简单的服务器，它只发送一个文本给使用子进程和select((方式连接的人。现在我正在尝试创建一个使用poll()和std:：vector来存储套接字的容器。

问题是它编译正常，但当我运行它并尝试从浏览器连接时，与我所做的其他操作不同，它不会发送响应，浏览器将永远等待。

我检查了很多次代码，没有发现任何错误或逻辑问题。来源在这里：

#include <sys/types.h>
#include <sys/socket.h>
#include <poll.h>
#include <vector>
#include <algorithm>
#include <netdb.h>
#include <cstdio>
#include <string.h>
#include <unistd.h>
#define PORT "19456"
#define BACKLOG 10
using namespace std;
int main() {
    sockaddr_storage remote_addr;
    socklen_t remote_addr_size;
    addrinfo settings, *result_info, *info;
    int srv_socket, conn_socket, gai_result, send_status, yes = 1;
    vector <pollfd> fds;
    vector <pollfd>::iterator fd;
    vector <pollfd>::const_iterator last_fd;
    pollfd listener_fd, new_fd;
    memset(&settings, 0, sizeof settings);
    settings.ai_family = AF_INET;
    settings.ai_socktype = SOCK_STREAM;
    settings.ai_flags = AI_PASSIVE;
    if((gai_result = getaddrinfo(NULL, PORT, &settings, &result_info)) != 0) {
            fprintf(stderr, "getaddrinfo: %sn", gai_strerror(gai_result));
            return 1;
    }
    for(info = result_info; info != NULL; info = info->ai_next) {
            if((srv_socket = socket(info->ai_family, info->ai_socktype, info->ai_protocol)) == -1) {
                    perror("Error on socket()");
                    continue;
            }
            if(setsockopt(srv_socket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {
                    close(srv_socket);
                    perror("Error on setsockopt()");
                    return 1;
            }
            if(bind(srv_socket, info->ai_addr, info->ai_addrlen) == -1) {
                    close(srv_socket);
                    perror("Error on bind()");
                    continue;
            }
            break;
    }
    if(info == NULL) {
            fprintf(stderr, "Failed on all bind()");
            return 1;
    }
    freeaddrinfo(result_info);
    if(listen(srv_socket, BACKLOG) == -1) {
            perror("Error on listen()");
            return 1;
    }
    listener_fd.fd = srv_socket;
    listener_fd.events = POLLIN;
    fds.push_back(listener_fd);
    while(1) {
            pollfd fds_array[fds.size()];
            copy(fds.begin(), fds.end(), fds_array);
            poll(fds_array, (nfds_t) fds.size(), 0);
            if(listener_fd.revents & POLLIN) {
                    remote_addr_size = sizeof remote_addr;
                    if((conn_socket = accept(srv_socket, (sockaddr *) &remote_addr, &remote_addr_size)) == -1) {
                            close(srv_socket);
                            perror("Error on accept()");
                            return 1;
                    }
                    new_fd.fd = conn_socket;
                    new_fd.events = POLLOUT;
                    fds.push_back(new_fd);
            }
            for(fd = fds.begin() + 1, last_fd = fds.end(); fd != last_fd; ++fd) {
                    if(fd->revents & POLLOUT) {
                            send_status = send(fd->fd, "Test", 4, 0);
                            close(fd->fd);
                            fds.erase(fd);
                            if(send_status == -1) {
                                    perror("Error on send()");
                                    return 1;
                            }
                    }
            }
    }
    return 0;
}

我搜索了一下，没有发现任何相关的问题，在所有找到的问题中，问题出在语法上。

有人能帮我找出这个错误吗？我将非常感激。

编辑

根据本的回答，我改变了一些事情。现在唯一的问题是连接重置，我认为这是由于在没有读取请求的情况下关闭套接字造成的，另一个问题是服务器使用了超过80%的CPU。使用select((或子进程的方式不会发生这种情况。电流来源：

#include <sys/types.h>
#include <sys/socket.h>
#include <poll.h>
#include <vector>
#include <algorithm>
#include <netdb.h>
#include <cstdio>
#include <string.h>
#include <unistd.h>
#define PORT "19456"
#define BACKLOG 10
using namespace std;
int main() {
    sockaddr_storage remote_addr;
    socklen_t remote_addr_size;
    addrinfo settings, *result_info, *info;
    int srv_socket, conn_socket, gai_result, send_status, fd_index, fds_num, yes = 1;
    vector <pollfd> fds;
    pollfd listener_fd, new_fd;
    memset(&settings, 0, sizeof settings);
    settings.ai_family = AF_INET;
    settings.ai_socktype = SOCK_STREAM;
    settings.ai_flags = AI_PASSIVE;
    if((gai_result = getaddrinfo(NULL, PORT, &settings, &result_info)) != 0) {
            fprintf(stderr, "getaddrinfo: %sn", gai_strerror(gai_result));
            return 1;
    }
    for(info = result_info; info != NULL; info = info->ai_next) {
            if((srv_socket = socket(info->ai_family, info->ai_socktype, info->ai_protocol)) == -1) {
                    perror("Error on socket()");
                    continue;
            }
            if(setsockopt(srv_socket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {
                    close(srv_socket);
                    perror("Error on setsockopt()");
                    return 1;
            }
            if(bind(srv_socket, info->ai_addr, info->ai_addrlen) == -1) {
                    close(srv_socket);
                    perror("Error on bind()");
                    continue;
            }
            break;
    }
    if(info == NULL) {
            fprintf(stderr, "Failed on all bind()");
            return 1;
    }
    freeaddrinfo(result_info);
    if(listen(srv_socket, BACKLOG) == -1) {
            perror("Error on listen()");
            return 1;
    }
    listener_fd.fd = srv_socket;
    listener_fd.events = POLLIN;
    fds.push_back(listener_fd);
    while(1) {
            pollfd fds_array[fds.size()];
            copy(fds.begin(), fds.end(), fds_array);
            poll(fds_array, (nfds_t) fds.size(), 0);
            if(fds_array[0].revents & POLLIN) {
                    remote_addr_size = sizeof remote_addr;
                    if((conn_socket = accept(srv_socket, (sockaddr *) &remote_addr, &remote_addr_size)) == -1) {
                            close(srv_socket);
                            perror("Error on accept()");
                            return 1;
                    }
                    new_fd.fd = conn_socket;
                    new_fd.events = POLLOUT;
                    fds.push_back(new_fd);
            }
            for(fd_index = 1, fds_num = fds.size(); fd_index < fds_num; fd_index++) {
                    if(fds_array[fd_index].revents & POLLOUT) {
                            send_status = send(fds_array[fd_index].fd, "Test", 4, 0);
                            close(fds_array[fd_index].fd);
                            fds.erase(fds.begin() + fd_index);
                            if(send_status == -1) {
                                    perror("Error on send()");
                                    return 1;
                            }
                    }
            }
    }
    return 0;
}

现在应该是什么问题？