【bug】Socket operation on non-socket

bug代码

#include <iostream>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>          
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <string.h>

#define handdle_error(msg)\
    do{perror(msg);exit(EXIT_FAILURE);}while(0)

#define BACK_LOG 10
#define BUF_SIZE 1024
int main(int argc, char** argv)
{
    int sfd, cfd;
    if (sfd = socket(AF_INET, SOCK_STREAM, 0) == -1)
        handdle_error("create socket fail:");

    struct sockaddr_in servaddr;
    memset(&servaddr, 0, sizeof(sockaddr_in));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(6666);
    if ((bind(sfd, (struct sockaddr*)&servaddr, sizeof(servaddr))) == -1)
        handdle_error("bind socket error:");

    if ((listen(sfd, BACK_LOG)) == -1)
        handdle_error("listen socket fail:");

    char buf[BUF_SIZE];
    int rcv;
    std::cout << "prepare to receive message" << std::endl;
    while (1)
    {
        if ((cfd = accept(sfd, (sockaddr*)NULL, NULL)) == -1)
        {
            std::cout << "accept socket fail:%s(error no:%d)" << strerror(errno) << errno << std::endl;
            continue;
        }
        if (rcv = recv(cfd, (void*)buf, BUF_SIZE, 0) < 0)
        {
            std::cout << "recv socket fail:%s(error no:%d)" << strerror(errno) << errno << std::endl;
            continue;
        }
        buf[rcv] = '\0';
        std::cout << "receive message from client is:" << buf << std::endl;
    }
    return 0;
}

编译OK，运行报错

根据提示说明是第26行报错

但是看代码一点问题没有

原因是socket创建sfd那里除了问题，正确写法，见右侧

这种()不匹配问题往往十分隐晦，一个好的方法是在（）两侧流出空格，这样在语法高亮器的辅助下更容易发现问题