多进程服务器 -- 实现字符回射

服务器端

/*************************************************************************
* File Name: echoserverp.c
* Author: Chen WenKe
* Email: chenwenke666@gmail.com
* Blog: https://caotanxiaoke.github.io
* Created Time: Sun 18 Jun 2017 05:47:46 PM PDT
*
* Description: 多进程并发 客户端-服务器， 完成回射功能。    ************************************************************************/#include "csapp.h"void echo(int fd);
void sigchld_handler(int sig)
{while (waitpid(-1, 0, WNOHANG) > 0);return;
}int main(int argc, char **argv)
{int listenfd, connfd, port; socklen_t clientlen = sizeof(struct sockaddr_in);struct sockaddr_in clientaddr;if (argc != 2){fprintf(stderr, "usage: %s <port>\n", argv[0]);exit(0);}port = atoi(argv[1]); Signal(SIGCHLD, sigchld_handler);listenfd = Open_listenfd(port);while(1){connfd = Accept(listenfd, (SA *) &clientaddr, &clientlen);if(Fork() == 0){Close(listenfd); echo(connfd); Close(connfd);exit(0);}Close(connfd); }
}void echo(int connfd)
{int n; char buf[MAXLINE]; rio_t rio; Rio_readinitb(&rio, connfd); while(( n= Rio_readlineb(&rio, buf, MAXLINE)) != 0){printf("server received %d bytes\n", n); Rio_writen(connfd, buf, n); }
}

客户端

/*************************************************************************
* File Name: echoclient.c
* Author: Chen WenKe
* Email: chenwenke666@gmail.com
* Blog: https://caotanxiaoke.github.io
* Created Time: Sun 18 Jun 2017 08:00:49 PM PDT
*
* Description: ************************************************************************/#include "csapp.h"int main(int argc, char **argv)
{int clientfd, port; char *host, buf[MAXLINE];rio_t rio;if (argc != 3){fprintf(stderr, "usage: %s <host> <port>\n", argv[0]);exit(0); }host = argv[1]; port = atoi(argv[2]);clientfd = Open_clientfd(host, port); Rio_readinitb(&rio, clientfd); while (Fgets(buf, MAXLINE, stdin) != NULL){Rio_writen(clientfd, buf, strlen(buf)); Fputs(buf, stdout); }Close(clientfd);exit(0);
}

上面代码中所使用的头文件及编译方法