插座迴歸「沒有這樣的文件或目錄」

Question

的Linux GCC 4.4.2

我做一些socket編程。

然而，當我嘗試和分配從插座功能的sockfd我不斷收到此錯誤。

" Socket operation on non-socket" 

任何意見非常感謝，

#if defined(linux) 
#include <pthread.h> 
/* Socket specific functions and constants */ 
#include <sys/types.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <netdb.h> 
#include <errno.h> 
#endif 

#include "server.h" 
#include "cltsvr_ults.h" 

/* Listens for a connection on the designated port */ 
void wait_client() 
{ 
    struct addrinfo add_info, *add_res; 
    int sockfd; 

    /* Load up the address information using getaddrinfo to fill the struct addrinfo */ 
    memset(&add_info, 0, sizeof(add_info)); 
    /* Use either IPv4 or IPv6 */ 
    add_info.ai_family = AF_UNSPEC; 
    add_info.ai_socktype = SOCK_STREAM; 
    /* Fill in my IP address */ 
    add_info.ai_flags = AI_PASSIVE; 

    /* Fill the struct addrinfo */ 
    int32_t status = 0; 
    if(status = getaddrinfo(NULL, "6000", &add_info, &add_res) != 0) 
    { 
     fprintf(stderr, "getaddrinfo [ %s ]\n", gai_strerror(status)); 

     return; 
    } 

    if((sockfd = (socket(add_res->ai_family, add_res->ai_socktype, add_res->ai_protocol)) == -1)) 
    { 
     fprintf(stderr, "Socket failed [ %s ]\n", strerror(errno)); 

     return; 
    } 

    /* Bind to the port that has been assigned by getaddrinfo() */ 
    if(bind(sockfd, add_res->ai_addr, add_res->ai_addrlen) != 0) 
    { 
     fprintf(stderr, "Bind failed [ %s ]\n", strerror(errno)); 

     return; 
    } 

    printf("Listening for clients\n"); 
} 

編輯==編碼老 - 學校的方法

int32_t sockfd = 0; 
    struct sockaddr_in my_addr; 

    memset(&my_addr, 0, sizeof(my_addr)); 

    my_addr.sin_family = AF_INET; 
    my_addr.sin_port = htons(6000); 
    my_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); 

    sockfd = socket(PF_INET, SOCK_STREAM, 0); 
    if(sockfd == -1) 
    { 
    fprintf(stderr, "Socket failed [ %s ]\n", strerror(errno)); 
    return; 
    } 

    if(bind(sockfd, (struct sockaddr *) &my_addr, sizeof(my_addr)) == -1) 
    { 
    fprintf(stderr, "Bind failed [ %s ]\n", strerror(errno)); 
    return; 
    } 

Answer 1

您的主要問題是，你有錯誤的檢查當socket（）有錯誤。 socket（）將在錯誤時返回-1，而不是在成功時返回0。你可能會得到一個很好的套接字值（2，3等）並將其視爲一個錯誤。

還有第二個問題是你加入代碼的方式。當你寫：

if (sockfd = socket(add_res->ai_family, add_res->ai_socktype, add_res->ai_protocol) != 0) 

正被視爲：

if (sockfd = (socket(add_res->ai_family, add_res->ai_socktype, add_res->ai_protocol) != 0)) 

那麼的sockfd將不會分配插座的返回值，但它比較反對0修復這兩個問題的價值，你應該寫：

if ((sockfd = socket(add_res->ai_family, add_res->ai_socktype, add_res->ai_protocol)) == -1) 

Answer 2

我相信你應該指定你想要的插座類型。當你說：

add_info.ai_family = AF_UNSPEC; 

，你應該說：

add_info.ai_family = AF_INET;