Question

虽然没有任何相关内容，但我正在寻找我的问题的答案。我正在编写一个非常简单的代码，用于在运行ubuntu 14.04的虚拟机（VBOX）上运行服务器。

我关闭了我的防火墙和防病毒程序（读取它可能是相关的）

我重新检查（并查找了不同的端口）端口未使用但继续接收带有errno 88的bind（）函数的返回值-1（非套接字上的套接字操作）。

我在端口7777上运行服务器。还尝试在我的主机上运行此代码

有人可以建议我做错了吗？

p.s还检查了valgrind的代码是否有内存泄漏，但它看起来很好。

代码如下：

#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <iostream>
#include <fstream>
#include <strings.h>
#include <stdlib.h>
#include <string>
#include <pthread.h>
#include <errno.h>

using namespace std;

#define NUM_OF_THREADS  3

static int  connFd;

void *task1(void *);

/*
 * 
 */
int main(int argc, char** argv) {

    int pid, portNo, listenFd;
    socklen_t len; // store the size of the address
    bool loop = false;
    struct sockaddr_in svrAdd, clntAdd;

    pthread_t threadArr[NUM_OF_THREADS];

    if (argc < 2){
        cerr << "ERROR: ./server <port>" << endl;
        return 0;
    }

    portNo = atoi(argv[1]); // TODO verify the port is between 1024 and 65535

    //Create the socket
    if (listenFd = socket(AF_INET, SOCK_STREAM, 0) < 0){
        cerr << "ERROR: cannot open socket." << endl;
        return 0;
    }

    bzero((char*)&svrAdd, sizeof(svrAdd));

    svrAdd.sin_family = AF_INET;
    svrAdd.sin_addr.s_addr = INADDR_ANY;
    svrAdd.sin_port = htons(portNo);

    cout << "port number is : " << portNo << endl;

    //bind socket
    int bound = bind(listenFd, (struct sockaddr *)&svrAdd, sizeof(svrAdd));
    if ( bound < 0 ){
        cerr << "ERROR: cannot bind, error number: " << errno << endl;
        return 0;
    }

    listen(listenFd, 5);

    len = sizeof(clntAdd);

    int noTread = 0;

    while(noTread < 3){
        cout << "Listening..." << endl;

       if (connFd = accept(listenFd, (struct sockaddr*)&clntAdd, &len)<0){
            cerr << "ERROR: cannot accept connection" << endl;
            return 0;
        }
        else{
            cout << "Connection successful" << endl;
        }

        pthread_create(&threadArr[noTread], NULL, task1, NULL);
        noTread++;
    }

    for (int i=0; i < 3; i++){
        pthread_join(threadArr[i], NULL);
    }
    /*int sockfd, newsockfd, portno, clilen, n;
    char buffer[256];
    struct sockaddr_in serv_addr, cli_addr;

    if (argc < 2){
        fprintf(stderr, "ERROR, no port provided");
        exit(1);
    }

    if(sockfd = socket(AF_INET, SOCK_STREAM, 0) <  0){
        error("ERROR opening socket");
    }

    bzero((char *) &serv_addr, sizeof(serv_addr));

    portno = atoi(argv[1]);
    serv_addr.sin_family = AF_INET;

    serv_addr.sin_port = htons(portno);
    serv_addr.sin_addr.s_addr - INADDR_ANY;

    if(bind(sockfd, (struct sockaddr*)&))*/

    return 0;
}

void *task1(void *dummyPt){
    cout << "Thread number:  " << pthread_self() << endl;
    char test[300];
    bzero(test, 301);
    bool loop = false;
    while (!false){
        bzero(test, 301);
        read(connFd, test, 300);
        string tester(test);
        cout << "\n\t\t TESTER = " << tester << endl;

        if(tester == "exit"){
            break;
        }
    }
    cout << "\n Closing thread and conn" << endl;
    close(connFd);
}

执行的输出：

错误：无法绑定，错误号：88 端口号是：7777

RUN SUCCESSFUL（总时间：162ms）

请帮忙，感谢。

Answer 1

if (listenFd = socket(AF_INET, SOCK_STREAM, 0) < 0){

优先问题。这种情况的结果是为listenFd.分配零或1试试这个：

if ((listenFd = socket(AF_INET, SOCK_STREAM, 0)) < 0){

使用errno 88

1 个答案: