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

void client(int, int), server(int, int);

int main(int argc, char **argv)
{
    int        pipe1[2], pipe2[2];
    pid_t    childpid;
    pipe(pipe1);
    pipe(pipe2);
    if ( (childpid = fork()) == 0) {
        close(pipe1[1]); 
        close(pipe2[0]); 
        server(pipe1[0], pipe2[1]); 
        exit(0);
    }
        
    close(pipe1[0]); 
    close(pipe2[1]); 
    client(pipe2[0], pipe1[1]); 
    waitpid(childpid, NULL, 0);    
    
    exit(0);
}

#include <stdio.h>
#include <string.h>
#include <unistd.h>

#define MAXLINE 1024

void client(int readfd, int writefd)
{
    size_t    len;
    ssize_t    n;
    char    buff[MAXLINE];
    
    while(NULL != fgets(buff, MAXLINE, stdin))
    {            
        len = strlen(buff);    
        if (buff[len-1] == '
')
            len--;        
            
        write(writefd, buff, len); 
        
        if(0 != read(readfd, buff, MAXLINE))
        {
            fputs(buff, stdout);
        }
    }
}

#include <stdio.h>
#include <string.h>
#include <unistd.h>

#define MAXLINE 1024

void server(int readfd, int writefd)
{
    ssize_t    n;
    char    buff[MAXLINE+1];
    
    while(1)
    {
        if ( (n = read(readfd, buff, MAXLINE)) == 0)
        {
            printf("end-of-file while reading pathname");
            return;
        }
        buff[n] = '';        
            
        write(writefd, buff, n); 

        sleep(1);
    }
}