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服务端代码：

#include

#include

#include

#include

#include

#include

#include

#include

#define MYPORT 3490 /*定义用户连接端口*/

#define BACKLOG 10 /*多少等待连接控制*/

main()

{

int sockfd, new_fd; /* listen on sock_fd, new connection on new_fd

*/

struct sockaddr_in my_addr; /* my address information */

struct sockaddr_in their_addr; /* connector's address information */

int sin_size;

if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {

perror(\"socket\");

exit(1);

}

my_addr.sin_family = AF_INET; /* host byte order */

my_addr.sin_port = htons(MYPORT); /* short, network byte order */

my_addr.sin_addr.s_addr = INADDR_ANY; /* auto-fill with my IP */

bzero(&(my_addr.sin_zero),; /* zero the rest of the struct */

if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct

sockaddr))== -1) {

perror(\"bind\");

exit(1);

}

if (listen(sockfd, BACKLOG) == -1) {

perror(\"listen\");

exit(1);

}

while(1) { /* main accept() loop */

sin_size = sizeof(struct sockaddr_in);

if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, \\

&sin_size)) == -1) {

perror(\"accept\");

continue;

}

printf(\"server: got connection from %s\\n\

inet_ntoa(their_addr.sin_addr));

if (!fork()) { /* this is the child process */

if (send(new_fd, \"Hello, world!\\n\

perror(\"send\");

close(new_fd);

exit(0);

}

close(new_fd); /* parent doesn't need this */

while(waitpid(-1,NULL,WNOHANG) > 0); /* clean up child processes */

}

}

客户代码:

#include

#include

#include

#include

#include

#include

#include

#include

#define PORT 3490 /* 客户机连接远程主机的端口 */

#define MAXDATASIZE 100 /* 每次可以接收的最大字节 */

int main(int argc, char *argv[])

{

int sockfd, numbytes;

char buf[MAXDATASIZE];

struct hostent *he;

struct sockaddr_in their_addr; /* connector's address information */

if (argc != 2) {

fprintf(stderr,\"usage: client hostname\\n\");

exit(1);

}

if ((he=gethostbyname(argv[1])) == NULL) { /* get the host info */

herror(\"gethostbyname\");

exit(1);

}

if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {

perror(\"socket\");

exit(1);

}

their_addr.sin_family = AF_INET; /* host byte order */

their_addr.sin_port = htons(PORT); /* short, network byte order */

their_addr.sin_addr = *((struct in_addr *)he->h_addr);

bzero(&(their_addr.sin_zero),; /* zero the rest of the struct */

if (connect(sockfd, (struct sockaddr *)&their_addr,sizeof(struct

sockaddr)) == -1) {

perror(\"connect\");

exit(1);

}

if ((numbytes=recv(sockfd, buf, MAXDATASIZE, 0)) == -1) {

perror(\"recv\");

exit(1);

}

buf[numbytes] = '\\0';

printf(\"Received: %s\

close(sockfd);

return 0;

}