Linux下网络编程-简易Epll服务器和客户端
简易Epll服务器:
cpp
复制代码
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#define BUF_SIZE 100
#define EPOLL_SIZE 50
void error_handling(const char *buf);
int main(int argc, char *argv[])
{
if(argc!=2)
{
printf("Usage : %s <port>\n", argv[0]);
exit(1);
}
int serv_sock, clnt_sock;
struct sockaddr_in serv_adr, clnt_adr;
socklen_t adr_sz;
int str_len, i;
char buf[BUF_SIZE];
serv_sock=socket(PF_INET, SOCK_STREAM, 0);
memset(&serv_adr, 0, sizeof(serv_adr));
serv_adr.sin_family=AF_INET;
serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
serv_adr.sin_port=htons(atoi(argv[1]));
if(bind(serv_sock, (struct sockaddr*) &serv_adr, sizeof(serv_adr))==-1)
error_handling("bind() error");
if(listen(serv_sock, 5)==-1)
error_handling("listen() error");
epoll_event event;
int epfd,event_count;
epfd=epoll_create(100);
if(epfd==-1)
{
error_handling("epoll_create() failed");
close(serv_sock);
}
epoll_event* all_events=new epoll_event[EPOLL_SIZE];
event.events=EPOLLIN;//默认是设置条件触发方式
event.data.fd=serv_sock;
epoll_ctl(epfd,EPOLL_CTL_ADD,serv_sock,&event);
while(1)
{
event_count=epoll_wait(epfd,all_events,EPOLL_SIZE,-1);
if(event_count==-1)
{
puts("epoll_wait() error\n");
break;
}
for(int i=0;i<event_count;i++)
{
if(all_events[i].data.fd==serv_sock)
{
adr_sz=sizeof(clnt_adr);
clnt_sock=accept(serv_sock,(struct sockaddr*)&clnt_adr,&adr_sz);
event.events=EPOLLIN;
event.data.fd=clnt_sock;
epoll_ctl(epfd,EPOLL_CTL_ADD,clnt_sock,&event);
printf("connected client: %d \n", clnt_sock);
}
else
{
str_len=read(all_events[i].data.fd,buf,BUF_SIZE);
if(str_len==0)//关闭请求
{
epoll_ctl(epfd,EPOLL_CTL_DEL,all_events[i].data.fd,NULL);
close(all_events[i].data.fd);
printf("closed client:%d\n",all_events[i].data.fd);
}
else
{
write(all_events[i].data.fd,buf,BUF_SIZE);
}
}
}
}
delete[] all_events;
close(serv_sock);
close(epfd);
return 0;
}
void error_handling(const char *buf)
{
fputs(buf, stderr);
fputc('\n', stderr);
exit(1);
}
简易客户端:
cpp
复制代码
//编译命令:g++ -g PThreadSocketClient.cpp -o PThreadSocketClient -lpthread
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <pthread.h>
#define BUF_SIZE 100
#define NAME_SIZE 20
char name[NAME_SIZE]="[DEFAULT]";
char msg[BUF_SIZE];
void* send_msg(void * arg);
void* recv_msg(void * arg);
void error_handling(const char * msg);
int main(int argc, char *argv[])
{
int sock;
struct sockaddr_in serv_addr;
pthread_t snd_thread, rcv_thread;
void * thread_return;
if(argc!=4)
{
printf("Usage : %s <IP> <port> <name>\n", argv[0]);
exit(1);
}
sprintf(name, "[%s]", argv[3]);
sock=socket(PF_INET, SOCK_STREAM, 0);
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family=AF_INET;
serv_addr.sin_addr.s_addr=inet_addr(argv[1]);
serv_addr.sin_port=htons(atoi(argv[2]));
if(connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))==-1)
error_handling("connect() error");
pthread_create(&snd_thread,NULL,send_msg,(void*)&sock);
pthread_create(&rcv_thread,NULL,recv_msg,(void*)&sock);
pthread_join(snd_thread,&thread_return);
pthread_join(rcv_thread,&thread_return);
close(sock);
return 0;
}
void* send_msg(void * arg)
{
int sock=*(int *)arg;
char name_msg[NAME_SIZE+BUF_SIZE];
while(1)
{
fgets(msg,BUF_SIZE,stdin);
if(!strcmp(msg,"q\n")||!strcmp(msg,"Q\n"))
{
close(sock);
exit(0);
}
sprintf(name_msg,"%s %s",name,msg);
write(sock,name_msg,strlen(name_msg));
}
return NULL;
}
void* recv_msg(void * arg)
{
int sock=*(int *)arg;
char name_msg[NAME_SIZE+BUF_SIZE];
int str_len;
while(1)
{
str_len=read(sock,name_msg,NAME_SIZE+BUF_SIZE-1);
if(str_len==-1)
{
return (void*)-1;
}
name_msg[str_len]=0;
fputs(name_msg,stdout);
}
return NULL;
}
void error_handling(const char * msg)
{
fputs(msg, stderr);
fputc('\n', stderr);
exit(1);
}