套接字编程指针错误

Question

我正在尝试学习一些套接字编程，我也是 c 的新手，在创建我的服务器时遇到了一些问题。

我在使用指针时遇到了问题，当我尝试运行代码时遇到的错误是

warning: passing 'int *' to parameter of type 'socklen_t *' (aka 'unsigned int *') converts between pointers to integer types with different sign [-Wpointer-sign]`

我的服务器代码如下，谁能帮我解决这个错误？也欢迎任何其他提示或评论

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>

int main( int argc, char *argv[] )
{
   int sockfd, newsockfd, portno, clilen;
   char buffer[256];
   struct sockaddr_in serv_addr, cli_addr;
   int  n;

   /* First call to socket() function */
   sockfd = socket(AF_INET, SOCK_STREAM, 0);

   if (sockfd < 0)
      {
      perror("ERROR opening socket");
      exit(1);
      }

   /* Initialize socket structure */
   bzero((char *) &serv_addr, sizeof(serv_addr));
   portno = 5001;

   serv_addr.sin_family = AF_INET;
   serv_addr.sin_addr.s_addr = INADDR_ANY;
   serv_addr.sin_port = htons(portno);

   /* Now bind the host address using bind() call.*/
   if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
      {
      perror("ERROR on binding");
      exit(1);
      }

   /* Now start listening for the clients, here process will
   * go in sleep mode and will wait for the incoming connection
   */

   listen(sockfd,5);
   clilen = sizeof(cli_addr);

   /* Accept actual connection from the client */
   newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);
   if (newsockfd < 0)
      {
      perror("ERROR on accept");
      exit(1);
      }

   /* If connection is established then start communicating */
   bzero(buffer,256);
   n = read( newsockfd,buffer,255 );

   if (n < 0)
      {
      perror("ERROR reading from socket");
      exit(1);
      }

   printf("Here is the message: %s\n",buffer);

   /* Write a response to the client */
   n = write(newsockfd,"I got your message",18);

   if (n < 0)
      {
      perror("ERROR writing to socket");
      exit(1);
      }

   return 0;
}

Answer 1

好吧，其实你可以指出错误的确切位置，这样我们可以更快地查找。

无论如何，错误是在您传递 int * 而不是 socklen_t * 的 accept 调用中。在

 newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);

所以在这一行中：

int sockfd, newsockfd, portno, clilen;

将clien的声明改为

socklen_t clilen;

它会起作用的。

套接字编程指针错误

Socket Programming Pointer Error

c

sockets