3fc
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <pthread.h>
#include <sys/time.h>
#include <sys/types.h>
#include <math.h>

int pfds[2];
char buf[100000];

void do_fork(void)
{
    int n;

    sleep(1);
    printf("child reading...\n");
    n = read(pfds[0], buf, 64524);
    printf("%d bytes read\n", n);
    _exit(0); 
}


int main()
{
    pid_t pid;
    int n;
 
    if (pipe(pfds) < 0) {
	fprintf(stderr, "Couldn't create pipe\n");
	exit(1);
    }

    pid = fork();
    if (! pid) {
	do_fork();
    } 
    usleep(1000);

    printf("main writing...\n");
    n = write(pfds[1], buf, 64524);
    printf("parent wrote %d bytes\n", n);

//    printf("main writing...\n");
//    n = write(pfds[1], buf, 100);
//    printf("parent wrote %d bytes\n", n);

    n = read(pfds[0], buf, 4);
    if (n < 0) 
       perror("read");
    printf("parent: %d bytes read\n", n);
    getchar();
}
.

0