用到的结构体
struct sockaddr_un
{
__SOCKADDR_COMMON (sun_);
=====》#define __SOCKADDR_COMMON(sa_prefix) sa_family_t sa_prefix##family
=====》int sun_family;
=====》协议族 AF_UNIX
char sun_path[108]; //进行本地通信的路径名
};
例子:
struct sockaddr_un serveraddr;
serveraddr.sun_family = AF_UNIX;
//serveraddr.sun_path = "server_socket";
strcpy(serveraddr.sun_path, “server_socket”);
3、UDP本地通信
流程:
服务器:
创建套接字 socket
填充本地信息结构体 sockaddr_un
绑定套接字 bind
通信 recvfrom/sendto
客户端:
创建套接字 socket
填充本地信息结构体 sockaddr_un
通信 sendto/recvfrom (如果需要接受服务器的信息,需要绑定)
4、TCP本地通信
服务器(server)
#include
#include
#include
#include
#include
#include
//实现tcp本地通信服务器
#define N 128
#define errlog(errmsg) do{perror(errmsg); exit(1);}while(0)
int main(int argc, const char *argv[])
{
int sockfd;
struct sockaddr_un serveraddr, clientaddr;
int acceptfd;
char buf[N] = {};
socklen_t addrlen = sizeof(struct sockaddr_un);
//创建套接字 socket
if((sockfd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
{
errlog("fail to socket");
}
//填充本地信息结构体 sockaddr_un
serveraddr.sun_family = AF_UNIX;
strcpy(serveraddr.sun_path, "server_socket");
//绑定套接字 bind
if(bind(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0)
{
errlog("fail to bind");
}
//将套接字设置为监听状态 listen
if(listen(sockfd, 10) < 0)
{
errlog("fail to listen");
}
//阻塞等待客户端的连接请求 accept
if((acceptfd = accept(sockfd, (struct sockaddr *)&clientaddr, &addrlen)) < 0)
{
errlog("fail to accept");
}
//通信 recv/send
while(1)
{
if(recv(acceptfd, buf, N, 0) < 0)
{
errlog("fail to recv");
}
printf("from client >>> %s\n", buf);
strcat(buf, " from client ...");
if(send(acceptfd, buf, N, 0) < 0)
{
errlog("fail to send");
}
}
close(acceptfd);
close(sockfd);
return 0;
}
客户端(client)
#include
#include
#include
#include
#include
#include
//实现tcp本地通信客户端
#define N 128
#define errlog(errmsg) do{perror(errmsg); exit(1);}while(0)
int main(int argc, const char *argv[])
{
int sockfd;
struct sockaddr_un serveraddr;
int acceptfd;
char buf[N] = {};
socklen_t addrlen = sizeof(struct sockaddr_un);
//创建套接字 socket
if((sockfd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
{
errlog("fail to socket");
}
//填充本地信息结构体 sockaddr_un
serveraddr.sun_family = AF_UNIX;
strcpy(serveraddr.sun_path, "server_socket");
//发送客户端的连接请求 connect
if(connect(sockfd, (struct sockaddr *)&serveraddr, addrlen) < 0)
{
errlog("fail to connect");
}
//通信 recv/send
while(1)
{
fgets(buf, N, stdin);
buf[strlen(buf) - 1] = '\0';
if(send(sockfd, buf, N, 0) < 0)
{
errlog("fail to send");
}
if(recv(sockfd, buf, N, 0) < 0)
{
errlog("fail to recv");
}
printf("%s\n", buf);
}
close(sockfd);
return 0;
}
4、UDP本地通信
服务器(server)
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define N 128
#define errlog(errmsg) do{perror(errmsg); exit(1);}while(0)
int main(int argc, const char *argv[])
{
int sockfd;
struct sockaddr_un serveraddr, clientaddr;
socklen_t addrlen = sizeof(struct sockaddr_un);
char buf[N] = {};
//memset bzero 清空结构体(初始化)
//创建套接字
if((sockfd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
{
errlog("fail to socket");
}
//填充本地信息结构体
serveraddr.sun_family = AF_UNIX;
strcpy(serveraddr.sun_path, "server_socket");
//将套接字与IP地址和端口号绑定
if(bind(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0)
{
errlog("fail to bind");
}
while(1)
{
if(recvfrom(sockfd, buf, N, 0, (struct sockaddr *)&clientaddr, &addrlen) < 0)
{
errlog("fail to recvfrom");
}
if(strncmp(buf, "quit", 4) == 0)
{
break;
}
else
{
printf("from client %s\n", buf);
strcat(buf, " from server...");
if(sendto(sockfd, buf, N, 0, (struct sockaddr *)&clientaddr, sizeof(clientaddr)) < 0)
{
errlog("fail to sendto");
}
}
}
close(sockfd);
return 0;
}
客户端(client)
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define N 128
#define errlog(errmsg) do{perror(errmsg); exit(1);}while(0)
int main(int argc, const char *argv[])
{
int sockfd;
struct sockaddr_un serveraddr, clientaddr;
char buf[N] = {};
socklen_t addrlen = sizeof(struct sockaddr_un);
//创建套接字
if((sockfd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
{
errlog("fail to socket");
}
//填充网络信息结构体
serveraddr.sun_family = AF_UNIX;
strcpy(serveraddr.sun_path, "server_socket");
//填充客户端网络信息结构体
clientaddr.sun_family = AF_UNIX;
strcpy(clientaddr.sun_path, "client_socket");
//绑定客户端的信息
if(bind(sockfd, (struct sockaddr *)&clientaddr, addrlen) < 0)
{
errlog("fail to bind");
}
while(1)
{
fgets(buf, N, stdin);
buf[strlen(buf) - 1] = '\0';
if(sendto(sockfd, buf, N, 0, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0)
{
errlog("fail to sendto");
}
if(strncmp(buf, "quit", 4) == 0)
{
break;
}
else
{
if(recvfrom(sockfd, buf, N, 0, (struct sockaddr *)&serveraddr, &addrlen) < 0)
{
errlog("fail to recvfrom");
}
printf("%s\n", buf);
}
}
close(sockfd);
return 0;
}