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一、fork创建进程，来实现多并发
这只是个demon，并不能用于实际项目，多进程，消耗太多资源。没有人这么玩

1、服务端代码：

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>int main(int argc,char **argv)
{int s_fd;int c_fd;int n_read;char readBuf[128];char msg[128] = {0};struct sockaddr_in s_addr;struct sockaddr_in c_addr;if(argc != 3){printf("param is not good\n");exit(-1);}memset(&s_addr,0,sizeof(struct sockaddr_in));memset(&c_addr,0,sizeof(struct sockaddr_in));//1.sockets_fd = socket(AF_INET,SOCK_STREAM,0);if(s_fd == -1){perror("socket");exit(-1);}s_addr.sin_family = AF_INET;s_addr.sin_port = htons(atoi(argv[2]));inet_aton(argv[1],&s_addr.sin_addr);//2.bindbind(s_fd,(struct sockaddr *)&s_addr,sizeof(struct sockaddr_in));//3.listen listen(s_fd,10);//4.acceptint clen = sizeof(struct sockaddr_in);while(1){c_fd = accept(s_fd,(struct sockaddr *)&c_addr,&clen);//父进程负责acceptif(c_fd == -1){perror("accept");}printf("get connect:%s\n",inet_ntoa(c_addr.sin_addr));if(fork() == 0)//创建一个子进程，来实现读写功能，父进程负责accept{if(fork() == 0)//创建一个子进程的子进程，来实现写功能{while(1){memset(msg,0,sizeof(msg));printf("input:");fgets(msg,sizeof(msg),stdin);write(c_fd,msg,strlen(msg));}}//5.readwhile(1)//子进程父进程，来实现读功能{memset(readBuf,0,sizeof(readBuf));n_read = read(c_fd,readBuf,128);if(n_read == -1){perror("read");}else{printf("get message:%d,%s\n",n_read,readBuf);}}break;}}return 0;
}

2、客户端代码：

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>int main(int argc,char **argv)
{int c_fd;int n_read;char readBuf[128];//      char *msg = "msg form client";char msg[128] = {0};struct sockaddr_in c_addr;memset(&c_addr,0,sizeof(struct sockaddr_in));if(argc != 3){printf("parm is not good\n");exit(-1);}//1.socketc_fd = socket(AF_INET,SOCK_STREAM,0);if(c_fd == -1){perror("socket");exit(-1);}c_addr.sin_family = AF_INET;c_addr.sin_port = htons(atoi(argv[2]));inet_aton(argv[1],&c_addr.sin_addr);//2.connectif(connect(c_fd,(struct sockaddr *)&c_addr,sizeof(struct sockaddr)) == -1){perror("connect");exit(-1);}if(fork() == 0)//创建一个子进程，来实现写功能{while(1){memset(msg,0,sizeof(msg));printf("input:");fgets(msg,sizeof(msg),stdin);write(c_fd,msg,strlen(msg));}}while(1)//父进程进程，来实现读功能{memset(readBuf,0,sizeof(readBuf));n_read = read(c_fd,readBuf,128);if(n_read == -1){perror("read");}else{printf("get message form server:%d,%s\n",n_read,readBuf);}}return 0;
}