Linux GCC 4.4.2
我正在做一些套接字编程。
但是,当我尝试从套接字函数中分配sockfd时,我一直收到此错误。
" Socket operation on non-socket"
非常感谢任何建议,
#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");
}
使用旧式方法编辑==编码
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;
}
答案 0 :(得分:12)
您的主要问题是您在socket()出错时检查错误。 socket()将在出错时返回-1,而在成功时返回0。你可能会获得一个好的套接字值(2,3等)并将其视为错误。
您为代码括起来的方式还存在第二个问题。当你写:
if (sockfd = socket(add_res->ai_family, add_res->ai_socktype, add_res->ai_protocol) != 0)
这被视为:
if (sockfd = (socket(add_res->ai_family, add_res->ai_socktype, add_res->ai_protocol) != 0))
因此,不会为sockfd分配socket的返回值,而是将其与0进行比较的值。修复这两个问题,你应该写:
if ((sockfd = socket(add_res->ai_family, add_res->ai_socktype, add_res->ai_protocol)) == -1)
答案 1 :(得分:0)
我相信你应该指定你想要的套接字类型。当你说:
add_info.ai_family = AF_UNSPEC;
你应该说:
add_info.ai_family = AF_INET;