套接字编程-setsockopt:协议不可用?

问题描述

限时删除！！

我正在用 C 进行一些基本的套接字编程，但在我尝试运行代码的每台计算机上都遇到此错误.代码编译得很好，但是当我尝试运行它时，我收到错误 setsockopt: 协议不可用.这似乎不是一个很常见的错误，但我在每台尝试运行它的计算机上都会遇到它.所有电脑都是MacOS.

I'm doing some basic socket programming in C and I'm running into this error on every computer I try to run the code on. The code compiles fine, but when I try to run it I get the error setsockopt: Protocol not available. It doesn't seem to be a very common error, yet I'm having it with every computer I try to run it on. All of the computers have been MacOS.

#include <unistd.h>
#include <stdio.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <string.h>
#define PORT 8080
int main(int argc, char const *argv[])
{
    int server_fd, new_socket, valread;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[1024] = {0};
    char *hello = "Hello from server";

    // Creating socket file descriptor
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0)
    {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // Forcefully attaching socket to the port 8080
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT,
                                                  &opt, sizeof(opt)))
    {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons( PORT );

    // Forcefully attaching socket to the port 8080
    if (bind(server_fd, (struct sockaddr *)&address,
                                 sizeof(address))<0)
    {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    if (listen(server_fd, 3) < 0)
    {
        perror("listen");
        exit(EXIT_FAILURE);
    }
    if ((new_socket = accept(server_fd, (struct sockaddr *)&address,
                       (socklen_t*)&addrlen))<0)
    {
        perror("accept");
        exit(EXIT_FAILURE);
    }
    valread = read( new_socket , buffer, 1024);
    printf("%s\n",buffer );
    send(new_socket , hello , strlen(hello) , 0 );
    printf("Hello message sent\n");
    return 0;
}

有人告诉我，我需要包含 setsockopt() 方法，以便重新启动的进程可以连接到该地址，而不会因为 tcp 连接关闭后的等待时间而被阻塞.有人知道如何解决这个错误吗?

I was told that I needed to include the setsockopt() method so that processes that restart can connect to the address without being blocked because of waiting time after the tcp connection shuts down. Anyone know how to fix this error?

推荐答案

我遇到了类似的问题 只需替换这段代码

I had a similar problem just replace this piece of code

// Forcefully attaching socket to the port 8080
if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt)))

有了这个

// Forcefully attaching socket to the port 8080
if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR , &opt, sizeof(opt)))

这对我来说很好用(在 macOS 上).

this worked (on macOS) for me fine.

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