尝试在连接到服务器之前编译客户端时出错

Question

我正在尝试将客户端连接到服务器，因此客户端可以向服务器发送消息。 这里是我的代码

服务器

#include <sys/socket.h> 
#include <netinet/in.h> 
#include <arpa/inet.h> 
#include <time.h> 
#include <stdio.h> 
#include <strings.h> 
#include <string.h> 
#include <stdlib.h> 

int main(int argc, char **argv) 
{ 
    int connfd, listenfd, tmp, sin_size; 
    struct sockaddr_in servaddr, client; 
    char message[100]; 
    servaddr.sin_family = AF_INET; 
    servaddr.sin_addr.s_addr = INADDR_ANY; 
    servaddr.sin_port = htons(13); 
    bzero(&servaddr, sizeof(servaddr)); 

    listenfd = socket(AF_INET,SOCK_STREAM,0); 
    if(listenfd == -1) 
    { 
    printf("Error create socket\n"); 
    exit(1); 
    } 

    tmp = bind(listenfd, (struct sockaddr*)&servaddr, sizeof(struct sockaddr)); 
    if(tmp == -1) 
    { 
    printf("Error binding\n"); 
    exit(1); 
    } 

    listen(listenfd,2); 

    sin_size = sizeof(client); 
    connfd = accept(listenfd, (struct sockaddr*)&client, &sin_size); 
    if(connfd == -1) 
    { 
    printf("Error accept\n"); 
    exit(1); 
    } 
    bzero(&message, sizeof(message)); 
    read(connfd, &message, sizeof(message)); 
    write(connfd, message, sizeof(message)); 
    close(connfd); 
    close(listenfd); 

} 

客户

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

int main(int argc, char **argv) 
{ 
    int connfd, listenfd; 
    int port = atoi(argv[2]); 
    char message[100]; 

    listenfd = socket(AF_INET,SOCK_STREAM,0); 
    if(listenfd == -1) 
    { 
    printf("Error create socket\n"); 
    exit(1); 
    } 
    struct sockaddr_in servaddr; 

    bzero(&servaddr, sizeof(servaddr)); 
    servaddr.sin_family = AF_INET; 
    servaddr.sin_port = htons(port); 
    servaddr.sin_addr.s_addr = inet_addr(argv[1]); 

    connfd = accept(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr)); 
    if(connfd == -1) 
    { 
    printf("Error accept\n"); 
    exit(1); 
    } 
    bzero(&message, sizeof(message)); 
    printf("Input kata: "); 
    scanf("%[^\n]",message); 
    getchar(); 
    write(listenfd, &message, sizeof(message)); 
    read(listenfd, &message, sizeof(message)); 

    close(listenfd); 
} 

我编译和运行服务器（./server 8000），它在等待客户端连接。 当我试图编译有一个错误，该部件

connfd =接受（listenfd，（结构sockaddr *）& servaddr， 的sizeof（servaddr））;

它说

warning: passing argument 3 of ‘accept’ makes pointer from integer without a cast [enabled by default] 
/usr/include/x86_64-linux-gnu/sys/socket.h:214:12: note: expected ‘socklen_t * __restrict__’ but argument is of type ‘long unsigned int’ 

我应该怎么做来解决它？

Answer 1

作为警告建议你应该传递长度参数的地址而不是实际的长度。

socklen_t szaddr = sizeof(servaddr); 
connfd = accept(listenfd, (struct sockaddr*)&servaddr, &szaddr);