select function

[compiler]

Will someone please explain to me why this call to select won't return?

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>

int localpipes[2];
const char * message = "ichyfoobar";
int len;
int wresult,rresult;
int cstatus;
char buffer[98];
fd_set mainset;
int n;

void main()
{
        len = strlen(message);
        printf("creating pipes\n");
        if (pipe(localpipes) < 0)
        {
                printf("Error with the pipe function\n");
                exit(1);
        }
        printf("creating forked process\n");
        if (fork() == 0)
        {
                if ((wresult = write(localpipes[1],message,len)) < 1)
                {
                        printf("Error with write\n");
                        exit(2);
                }
                exit(0);
        }

        wait(&cstatus);

        FD_ZERO(&mainset);
        FD_SET(localpipes[0],&mainset);
        printf("Gets stuck next line\n");
        n = select(1,&mainset,NULL,NULL,NULL);
        printf("We won't see this\n");
        printf("n : %d\n",n);
        printf("Reading the data\n");

        if ((rresult = read(localpipes[0],buffer,70)) < 1)
        {
                printf("Error with read\n");
                exit(3);
        }


        printf("%s\n",buffer);
        exit(0);
}

I've tried putting values into the last struct timeval parameter, but that
doesn't seem to make any difference.  Thanks in advance.

-john