c++ - 连接到套接字失败 - errno 88 (cpp)

Question

我正在尝试创建服务器/客户端通信，但它在 connect 函数上失败了，errno 88。我检查了 socketfd 是否有效(因为这个 errno 意味着我正在尝试对非套接字对象进行套接字操作)。

int main (int argc, char *argv[])
{
// Validity check
if (argc != VALID_ARG_NUM) {
    std::cout << INVALID_ARG;
    return 0; // todo - return 0 is correct??
}

int port;
struct sockaddr_in server_address;

// server_address initialization.
server_address.sin_family = AF_INET;
server_address.sin_port = htons((uint32_t)atof(argv[3]));
server_address.sin_addr.s_addr = inet_addr(argv[2]);
memset(&(server_address.sin_zero), '\0', sizeof(server_address));

// Create the client socket.
if (sockfd = socket(AF_INET, SOCK_STREAM, 0) < 0) {
    std::cout << "ERROR: socket " << errno << "." << std::endl;
    exit(1);
}
// Connect to server.
if (connect(sockfd, (struct sockaddr *)&server_address, sizeof(server_address)) < 0) {
    std::cout << "ERROR: connect " << errno << "." << std::endl;
    std::cout << CON_FAIL;
    close(sockfd);
    exit(1);
}
.......

谢谢。

Answer 1

语句的优先级

sockfd = socket(AF_INET, SOCK_STREAM, 0) < 0

是

sockfd = ((socket(AF_INET, SOCK_STREAM, 0)) < 0)

因此您分配了一个 bool 值，它被隐式转换为整数(或 sockfd 具有的任何类型)。你的意思可能是相反

(sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0