[英]Message which I sent from a client program to server program prints in client program C Linux
我通过 Internet 了解应用程序如何自己工作。 我编写了一个客户端程序,它将消息发送到服务器程序,然后该消息应该打印在服务器程序中,但是该消息打印到客户端程序中。 这里代码服务器程序和客户端程序,还有header文件重新定义一些类型。
编译时没有任何错误和警告,所以我没有发送编译过程。
服务器.c
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <sys/un.h>
#include "../main_values.h"
int main()
{
int socket_server = socket(AF_INET, SOCK_STREAM, 0); //create a socket server
int opt = 1;
setsockopt(socket_server, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); //set an option to socket to
//if we ends working with
sockaddr_in addr_server; //socket connected with
addr_server.sin_family = AF_INET; //ip address, free ip
addr_server.sin_port = htons(2251);
addr_server.sin_addr.s_addr = inet_addr("127.0.0.222");
int stat = bind(socket_server, (sockaddr *)&addr_server, sizeof(addr_server)); //connecting ip addr and socket
if (stat == -1)
{
perror("ERROR");
}
sockaddr_in addr_client; //create the future client ip stucture
socklen_t len = 0;
listen(socket_server, 15); //set server socket into listening
int socket_client = accept(socket_server, (sockaddr *)&addr_client, &len); //connecting client ip with our socket
if (socket_client == -1)
{
perror("ERROR");
}
char msg[100];
int res = read(socket_server, msg, sizeof(msg)); //getting message from client
printf("MESSAGE FROM CLIENT: %s\n", msg); //printing message from client
shutdown(socket_server, SHUT_RDWR); //closing server socket
return 0;
}
客户端.c
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <sys/un.h>
#include "../main_values.h"
int main()
{
int socket_client = socket(AF_INET, SOCK_STREAM, 0); //create a client socket
int opt = 1; //set an option like in a server.c
setsockopt(socket_client, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
sockaddr_in addr_client; //making client ip structure
addr_client.sin_family = AF_INET;
addr_client.sin_port = htons(2250);
addr_client.sin_addr.s_addr = htons(INADDR_ANY);
int stat = bind(socket_client, (sockaddr *)&addr_client, sizeof(addr_client)); //connecting ip and client socket
if (stat == -1)
{
perror("ERROR");
}
sockaddr_in addr_server; //creating a server ip structure
addr_server.sin_family = AF_INET;
addr_server.sin_port = htons(2251);
addr_server.sin_addr.s_addr = inet_addr("127.0.0.222");
int socket_server = connect(socket_client, (sockaddr *)&addr_server, sizeof(addr_server));
if (socket_server == -1) //connecting to server
{
perror("ERROR");
}
char msg[] = "HELLO WORLD!!!!!"; //excample message
int res = write(socket_server, msg, sizeof(msg)); //sending a message to server
shutdown(socket_client, SHUT_RDWR);
return 0;
}
main_values.h
#pragma once
typedef struct sockaddr sockaddr;
typedef struct sockaddr_in sockaddr_in;
1号航站楼
ch@ch:~/Рабочий стол/mainc.4/my_server$ ./server.out
MESSAGE FROM CLIENT:
ch@ch:~/Рабочий стол/mainc.4/my_server$
终端_2
ch@ch:~/Рабочий стол/mainc.4/my_server$ ./client.out
HELLO WORLD!!!!!ch@ch:~/Рабочий стол/mainc.4/my_server$
int socket_server = connect(socket_client, (sockaddr *)&addr_server, ... int res = write(socket_server, msg, sizeof(msg));
如果连接成功,则connect
的返回码为 0。 因此socket_server
为 0。这意味着对文件描述符 0 的write
已完成,这相当于标准输入,因此会导致对终端的写入。
正确的代码是写入socket_client
,而不是socket_server
。 命名表明connect
返回的内容有些混乱,即它返回一个状态而不是一个新的套接字。 有关详细信息,请参阅连接文档。
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