c_cpp Linux的下TCP的套接字编程示例

Posted 2021-05-14

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <dirent.h>
#include <signal.h>
#include <ctype.h>
 
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
 
int main()
{
  int lfd = socket(AF_INET,SOCK_STREAM,0);
 
  int opt = 1;//端口复用
  setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
 
  struct sockaddr_in addr;
  bzero(&addr, sizeof(addr));
  addr.sin_family = AF_INET;
  //inet_pton(AF_INET, "192.168.78.45", &laddr.sin_addr.s_addr);//监听特定地址
  addr.sin_addr.s_addr = htonl(INADDR_ANY);//监听所有地址
  addr.sin_port = htons(8888);
  if(bind(lfd, (struct sockaddr*)&addr, sizeof(addr))<0)
  {
      perror("bind");
      exit(1);
  }
 
  if (listen(lfd, 128) < 0)
  {
      perror("listen");
      exit(1);
  }
 
  bzero(&addr, sizeof(addr));
  socklen_t addrlen = sizeof(addr);
  int cfd = accept(lfd, (struct sockaddr*)&addr,&addrlen);
  char pbuf[16] = { 0 };
  inet_ntop(AF_INET, &addr.sin_addr.s_addr, pbuf, sizeof(pbuf));
  printf("[%s]:[%d] Connect.\n", pbuf, ntohs(addr.sin_port));
 
  //主业务
  char buf[128] = { 0 };
  bzero(&buf, sizeof(buf));
  while (scanf("%s", buf) > 0)
  {
      if(send(cfd, buf,strlen(buf),MSG_WAITALL) < 0)
      {
          perror("write");
          exit(1);
      }
      bzero(buf, sizeof(buf));
  }
  close(lfd);
  close(cfd);
  printf("server closed.\n");
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <dirent.h>
#include <signal.h>
#include <ctype.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main()
{
  int sfd = socket(AF_INET, SOCK_STREAM, 0);
  struct sockaddr_in addr;
  bzero(&addr, sizeof(addr));
  addr.sin_family = AF_INET;
  inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr.s_addr);
  addr.sin_port = htons(8888);

  if(connect(sfd, (struct sockaddr*)&addr, sizeof(addr)) < 0)
  {
      perror("connect");
      exit(1);
  }

  //主业务
  char buf[128] = { 0 };
  while (recv(sfd, buf, sizeof(buf),MSG_WAITALL)> 0)
  {
      printf("c:[%s]\n", buf);
      bzero(buf, sizeof(buf));
  }
  close(sfd);
  printf("client closed.\n");
}