server.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <signal.h>
#include <sys/epoll.h>
#include <errno.h> #define UNIX_DOMAIN "/tmp/UNIX.domain" void handler(){ printf("clean program start\n");
//unlink(UNIX_DOMAIN);
remove(UNIX_DOMAIN);
printf("clean end.\n");
} int main(void)
{
int lsn_fd, apt_fd;
struct sockaddr_un srv_addr;
struct sockaddr_un clt_addr;
socklen_t clt_len;
int ret;
int i;
char recv_buf[];
char send_buf[]; signal(SIGTERM,handler); //create epoll
int epfd,eventfd;
struct epoll_event ev,events[]; epfd = epoll_create(); //create socket to bind local IP and PORT
lsn_fd = socket(AF_UNIX, SOCK_STREAM, );
ev.data.fd = lsn_fd;
ev.events = EPOLLIN|EPOLLET; epoll_ctl(epfd,EPOLL_CTL_ADD,lsn_fd,&ev); if(lsn_fd < )
{
perror("can't create communication socket!");
return ;
} //create local IP and PORT
srv_addr.sun_family = AF_UNIX;
strncpy(srv_addr.sun_path, UNIX_DOMAIN, sizeof(srv_addr.sun_path) - );
//unlink(UNIX_DOMAIN); //bind sockfd and sockaddr
ret = bind(lsn_fd, (struct sockaddr*)&srv_addr, sizeof(srv_addr));
if(ret == -)
{
perror("can't bind local sockaddr!");
close(lsn_fd);
unlink(UNIX_DOMAIN);
return ;
} //listen lsn_fd, try listen 5 ret = listen(lsn_fd, );
if(ret == -)
{
perror("can't listen client connect request");
close(lsn_fd);
unlink(UNIX_DOMAIN); return ;
} clt_len = sizeof(clt_addr);
while()
{
int nfds = epoll_wait(epfd,events,,);
int i=;
for(i=;i<nfds;++i)
{
if(events[i].data.fd == lsn_fd)
{
apt_fd = accept(lsn_fd, (struct sockaddr*)&clt_addr, &clt_len);
if(apt_fd < ){
perror("can't listen client connect request");
close(lsn_fd);
unlink(UNIX_DOMAIN);
return ;
}
char lines[];
sprintf(lines,"server data to client\n");
write(apt_fd, lines, ); ev.data.fd = apt_fd;
ev.events = EPOLLIN|EPOLLET; epoll_ctl(epfd,EPOLL_CTL_ADD,apt_fd,&ev); }
else if (events[i].events & EPOLLIN)
//write数据
{
printf("EPOLLIN\n");
if( (eventfd = events[i].data.fd) < )
continue; int n=,ret= ;
char line[];
if ((ret = read(eventfd,line,)) < ){ if(errno == ECONNRESET){
close(eventfd);
events[i].data.fd = -;
}
else
printf("readline error\n");
}
else if( ret == ){
close(eventfd);
events[i].data.fd = -;
}
else if( ret > )
{
line[ret] = '\0';
printf("%s",line);
while( ( ret = read(eventfd,line,)) >)
{
line[ret] = '\0';
printf("%s",line);
}
printf("\n");
}
}
else if (events[i].events & EPOLLOUT){
//写出的数据,在EPOLLIN处理中设置fd的events为EPOLLOUT|EPOLLET时,即触发该事件
int eventfd = events[i].data.fd;
char line[];
write(eventfd,line,); ev.data.fd = eventfd;
ev.events = EPOLLIN | EPOLLET; epoll_ctl ( epfd, EPOLL_CTL_ADD, eventfd, &ev);
}
}
} close(apt_fd);
close(lsn_fd);
unlink(UNIX_DOMAIN);
return ;
}
client.c
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h> #define UNIX_DOMAIN "/tmp/UNIX.domain" int main(void)
{
int connect_fd;
struct sockaddr_un srv_addr;
char snd_buf[];
char rcv_buf[];
int ret;
int i;
connect_fd = socket(AF_UNIX, SOCK_STREAM, ); if(connect_fd < )
{
perror("client create socket failed");
return ;
}
srv_addr.sun_family = AF_UNIX;
strcpy(srv_addr.sun_path, UNIX_DOMAIN);
ret = connect(connect_fd, (struct sockaddr*)&srv_addr, sizeof(srv_addr)); if(ret == -)
{
perror("connect to server failed!");
close(connect_fd);
unlink(UNIX_DOMAIN);
return ;
} memset(rcv_buf, , );
int rcv_num = read(connect_fd, rcv_buf, sizeof(rcv_buf));
printf("receive message from server (%d) :%s\n", rcv_num, rcv_buf); memset(snd_buf, , );
strcpy(snd_buf, "message from client");
printf("sizeof(snd_buf): %d\n", sizeof(snd_buf)); printf("send data to server... ...\n");
for(i = ; i < ; i++)
{
write(connect_fd, snd_buf, sizeof(snd_buf));
}
printf("send end!\n");
close(connect_fd);
return ; }
与网络的socket通信的区别,即socket地址有些区别,其他的一样。
sockaddr_in用于网络的socket通信,sockaddr_un用于本机上的进程之间的通信。