math_client.c

linux 高级编程的例子源码,包括了本书上的所有代码

/*filename: math_client.c*/
#include "xdr_math.h"

void usage(char *name)
{
   printf("Usage: %s hostname/IPaddr\n",name);
   exit (1);
}

int main(int argc,char **argv)
{
   struct MATH math;
   struct timeval timeout;
   CLIENT *client;
   enum clnt_stat stat;
   char c;

   if (argc!=2)
     usage(argv[0]);
   
   printf("choose the operate:\n\t0---ADD\n\t1---SUB\n\t2---MUL\n\t3---DIV\n");

   c=getchar();
   switch ( c )
   {
      case '0':
         math.op=ADD;
         break;
      case '1':
         math.op=SUB;
         break;
      case '2':
         math.op=MUL;
         break;
      case '3':
         math.op=DIV;
         break;
      default :
         printf("error :operate\n");
         exit(1);
   }
   
   printf("Input the first number: ");
   scanf("%f",&math.arg1);
   
   printf("Input the second number: ");
   scanf("%f",&math.arg2);

   client=clnt_create(argv[1],MATH_PROG,MATH_VER,"tcp");
   if (client==NULL)
   {
       clnt_pcreateerror("error: create client\n");
       exit(1);
   }   
   
   timeout.tv_sec=30;
   timeout.tv_usec=0;

   stat=clnt_call(client,MATH_PROC,(xdrproc_t)xdr_math,(caddr_t)&math,(xdrproc_t)xdr_math,(caddr_t)&math,timeout);
   if (stat!=RPC_SUCCESS)
   {
       clnt_perror(client,"Call Failed");
       exit(1);
   }

   printf("The Result is %.3f \n",math.result);
   
   exit(0);
}