socket编程

客户端：client.c

#include
#include
#include
#include
#include
#include
#include
#include
#include

int main(int argc, char **argv[])
{
  struct sockaddr_in addr, servaddr;
  int s, err;
  int port = 8383;
  char IP[100] = "10.144.15.234";
  char msg[100]="Hello \n";
  if((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) printf("error in socket\n");
  bzero(&addr, sizeof(addr));
  addr.sin_family = AF_INET;
  addr.sin_port = htons(port);
  addr.sin_addr.s_addr = inet_addr(IP);

  err =  connect(s, (struct sockaddr *) &addr, sizeof(addr));
  if (err <0) printf("error:%d\n",errno);
  send(s, msg, sizeof(msg), 0);

}

编译参数：

cc -o client client.c -lsocket -lnsl

服务器端：host.c

#include
#include
#include
#include
#include
#include
#include
#include
#include

int main(int argc, char **argv[])
{
  struct sockaddr_in addr, caddr;
  int s,cs, len, err;
  int port = 8383;
  char IP[100] = "10.144.15.234";
  char msg[100];
  if((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) printf("error in socket\n");
  bzero(&addr, sizeof(addr));
  addr.sin_family = AF_INET;
  addr.sin_port = htons(port);
  addr.sin_addr.s_addr = htonl(INADDR_ANY);
  err = bind(s, (struct sockaddr *)&addr, sizeof(addr));
  if(err < 0) {
     printf("bind error\n");
     printf("error = %d : ",errno);
     printf("EBADF, EACCESS, ENOTSOCK=%d,%d,%d\n", EBADF,EACCES,ENOTSOCK);
     exit(0);
  }
  listen(s, SOCK_STREAM);
  len = sizeof(addr);
  while(1){
    cs = accept(s, (struct sockaddr *)&addr, &len); 
    if(cs >0) {
      read(cs, msg, 100);
      printf("now recv %s\n",msg);
    }
    else  sleep(1);
  }

}
编译参数：

cc -o host host.c -lsocket -lnsl