C语言实现socket简单通信实例

/*============================================================================Name : server.cAuthor : kingVersion :Copyright : Your copyright noticeDescription : Hello World in C, Ansi-style============================================================================*/#include <stdlib.h>#include <pthread.h>#include <sys/socket.h>#include <sys/types.h>#include <netinet/in.h>#include <arpa/inet.h> /* inet(3) functions */#include <stdlib.h>#include <errno.h>#include <stdio.h>#include <string.h>int handle(int point);int main(void) {int sfd, ind;struct sockaddr_in addr;struct sockaddr_in clent;char resv[1024], sendbuf[1024];char buf[1024];char * myaddr = "192.168.231.128";int ret; // 返回值设置socklen_t lent;int pid;addr.sin_family = AF_INET; //IPv4 Internet protocolsaddr.sin_port = htons(5050); //这里输入服务器端口号addr.sin_addr.s_addr = inet_addr(myaddr);; //INADDR_ANY表示本机IP//取socket描述符，IPV4asdprintf("socket start /n");sfd = socket(AF_INET, SOCK_STREAM, 0);if (sfd < 0) {printf("socket error /n");return -1;}printf("bind start /n");//将套接子与指定端口链接if (bind(sfd, (struct sockaddr *) &addr, sizeof(struct sockaddr)) < 0) {printf("bind error /n");return -1;}//监听套接子printf("listen start /n");if (listen(sfd, 1024) < 0) {printf("listen error /n");return -1;}for (;;) {//接受来自客户端的信息printf("accept start /n");memset(&clent, 0, sizeof(clent));lent = sizeof(clent);ind = accept(sfd, (struct sockaddr *) &clent, &lent);if (ind < 0) {printf("accept error %d /n", ind);return -1;}printf("infor /n");printf("clent addr%s porit %d/n",inet_ntop(AF_INET, &clent.sin_addr, buf, sizeof(buf)),ntohs(clent.sin_port));pid = fork();if (pid == 0) {//子进程close(sfd);handle(ind);} else if (pid < 0) {//errorclose(ind);} else {//父进程}}return EXIT_SUCCESS;}int handle(int point) {int retn;char buf[1024];for (;;) {retn = read(point, buf, sizeof(buf));if (retn < 0) {printf("read error /n");close(point);break;} else if (retn == 0) {printf("client exit /n");close(point);break;}printf("client:%s/n", buf);if (strcmp("exit", buf) == 0) {printf("exit /n");close(point);return 0;}}return 0;}

/* ============================================================================ Name    : client.c Author   : king Version   : Copyright  : Your copyright notice Description : Hello World in C, Ansi-style ============================================================================ */#include <stdio.h>#include <stdlib.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>    /* inet(3) functions */int handle(int fd);int main(void) {  int nsd;  char buf[1024];  char * myaddr = "192.168.231.128";  struct sockaddr_in addr;  printf("welcome to echo client/n");  nsd = socket(AF_INET, SOCK_STREAM, 0);  printf("connect start1 /n");  //bzero(addr, sizeof(*addr));  memset(&addr,0,sizeof(addr));  printf("connect start2 /n");  addr.sin_family = AF_INET;  addr.sin_port = htons(5050);  addr.sin_addr.s_addr=inet_addr(myaddr);  printf("connect start3 /n");  if (connect(nsd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) < 0) {    printf("connect error /n");    return -1;  }  sleep(5);  printf("handle start/n");  handle(nsd);  close(nsd);  return EXIT_SUCCESS;}int handle(int fd) {  char sendl[1024], rev[1024];  int retn;  for (;;) {    memset(sendl,0,sizeof(sendl));    memset(rev,0,sizeof(rev));    if (fgets(sendl, 1024, stdin) == NULL) {      break;    }    //    printf("wirte start/n");    write(fd, sendl, strlen(sendl));    read(fd, rev,strlen(rev));  }  return 0;}