Linux內核在3.6和3.7合入了TCP Fast Open特性，在3.7.3版本上驗證了一下，I did it!

以下是C語言實例()：

server端代碼：

#include /* See NOTES */

#include

#include

#include

int main(){

int portno = 5060;

socklen_t clilen;

char buffer[256];

struct sockaddr_in serv_addr, cli_addr;

int cfd;

int sfd = socket(AF_INET, SOCK_STREAM, 0); ? // Create socket

bzero((char *) &serv_addr, sizeof(serv_addr));

serv_addr.sin_family = AF_INET;

serv_addr.sin_addr.s_addr = INADDR_ANY;

serv_addr.sin_port = htons(portno);

bind(sfd, &serv_addr,sizeof(serv_addr));? ? ? // Bind to well known address

int qlen = 5; ? ? ? ? ? ? ? ? // Value to be chosen by application

int err = setsockopt(sfd, IPPROTO_TCP/*SOL_TCP*/, 23/*TCP_FASTOPEN*/, &qlen, sizeof(qlen));

listen(sfd,1);? ? ? ? ? ? ? ? // Mark socket to receive connections

cfd = accept(sfd, NULL, 0); ? // Accept connection on new socket

while(1){

int len = read(cfd,buffer,256);

if(len)

printf("tcp fast open: %s\\n",buffer);

else

break;

// read and write data on connected socket cfd

}

close(cfd);

}

client端代碼：

#include

#include

#include

#include

int main(){

struct sockaddr_in serv_addr;

struct hostent *server;

char *data = "Hello, tcp fast open";

int data_len = strlen(data);

int sfd = socket(AF_INET, SOCK_STREAM, 0);

server = gethostbyname("localhost");

bzero((char *) &serv_addr, sizeof(serv_addr));

serv_addr.sin_family = AF_INET;

bcopy((char *)server->h_addr,

(char *)&serv_addr.sin_addr.s_addr,

server->h_length);

serv_addr.sin_port = htons(5060);

int len = sendto(sfd, data, data_len, 0x20000000/*MSG_FASTOPEN*/,

(struct sockaddr *) &serv_addr, sizeof(serv_addr));

printf("error: %s\\n",strerror(errno));

close(sfd);

sleep(5);

}

執行結果：

# ./server

tcp fast open: Hello, tcp fast open

# ./client

error: Success

環境：Fedora 18 升級內核到3.7.3；glibc 2.17；gcc 4.7.2

記得要執行： echo 1 > /proc/sys/net/ipv4/tcp_fastopen

總結

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