linux socket编程实例

/*
 ============================================================================
 Name    : client.c
 Author   : liusiyuan
 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 = "127.0.0.1";
  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;
}

/*
============================================================================
Name : server.c
Author : liusiyuan
Version :
Copyright : Your copyright notice
Description : 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 = "127.0.0.1";
 
int ret; // 返回值设置
socklen_t lent;
int pid;
addr.sin_family = AF_INET; //IPv4 Internet protocols
 
addr.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
 
//獲取socket描述符，IPV4asd
printf("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) {
//error
close(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;
}