/*
To wait for one of two file descriptors to be ready for reading:
*/

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<netdb.h>
#include<fcntl.h>
#include<string.h>
#include <errno.h>

int main()
{
int fd0, fd1, maxfd, result;
fd_set readfds;
struct timeval tv;
char buffer[2];

tv.tv_sec = 1;   // 1.5 seconds
tv.tv_usec = 500000;  

FD_ZERO(&readfds);
FD_SET(fd0,&readfds);
FD_SET(fd1,&readfds);

if (fd0>fd1) maxfd = fd0+1; else maxfd = fd1+1;

result = select(maxfd,&readfds,NULL,NULL,&tv);

if (result == 0) printf("timed out\n");
if (result < 0)  printf("error\n");
if (result > 0) { printf("%d fd's are now ready for reading\n",result);
                  if FD_ISSET(fd0,&readfds) read(fd0,buffer,1);
		  if FD_ISSET(fd1,&readfds) read(fd1,buffer+1,1);
                }

exit(0);
}