乙個Linux下的TCP服務2

為了優化 《乙個linux下的tcp服務1> 的效率, 本篇用epoll多路io復用技術, 並設定et模式, 檔名為epoll.c.

該檔案不僅包含了服務端**, 還包含客戶端**, 這可以通過編譯引數compile_server來控制. 同時可以指定客戶端數量, 具體**如下:

// epoll.c

#include #include #include #include #include #include #include #include #include #include #include #include int setnonblock(int fd) 
flags |= o_nonblock;
if (fcntl(fd, f_setfl, flags) == -1) 
return 0;
}int addfd(int efd, int fd, int mode)
int epolletadd(int efd, int fd, int mode)
void epolletdel(int efd, int fd)
void epolletmodifymode(int efd, int fd, int mode)
void connfunc(int efd, int fd)
epolletadd(efd, connfd, epollin | epollet);
}void readfunc(int efd, int fd)
else
return;
}else if (readlen == 0) 
#ifndef compile_server
printf("client recv msg: %s\n", buf);
#else 
printf("server recv msg: %s\n", buf);
#endif
epolletmodifymode(efd, fd, epollout | epollet);
}void writefunc(int efd, int fd)
void errfunc(int efd, int fd)
int binding(char *ip, int port, int sfd)
int connecting(char *ip, int port, int sfd)
int socketing(char *ip, int port)
#ifndef compile_server
if (connecting(ip, port, sfd) == -1)
#else
if (setsockopt(sfd, sol_socket, so_reuseaddr, (void *)&val, sizeof(int)) == -1)
if (binding(ip, port, sfd) == -1)
if (listen(sfd, 512) == -1)
#endif
return sfd;
faield:
close(sfd);
return -1;
}int server(char *ip, int port)
if ((sockfd = socketing(ip, port)) == -1)
if (epolletadd(epollfd, sockfd, epollin | epollet) == -1)
printf("epoll server start success.\n");
for(;;)
for (int index = 0; index < count; ++index) 
else if(activeevents[index].events & epollin)
else if (activeevents[index].events & epollout)
else }}
close(epollfd);
close(sockfd);
return 0;
}int client(char *ip, int port, int nums)
for (int i = 0; i < nums; ++i)
if (epolletadd(epollfd, sockfd, epollout | epollet) == -1)
}printf("epoll client start success.\n");
for(;;)
for (int index = 0; index < count; ++index) 
else if (activeevents[index].events & epollout)
else }}
close(epollfd);
close(sockfd);
return 0;
}int main(int argc, char *ar**)
client(ar**[1], atoi(ar**[2]), atoi(ar**[3]));
#else 
if (argc != 3)
server(ar**[1], atoi(ar**[2]));
#endif
return 0;
}

gcc epoll.c -o epoll_server -dcompile_server -std=c99

./epoll_server 127.0.0.1 6688

gcc epoll.c -o epoll_client -std=c99

./epoll_client 127.0.0.1 6688 1024

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