get sub process's output in parent process using pipe redirection

pipe_redirect.c

// get sub process's output in parent process using pipe redirection
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <fcntl.h>
#include <error.h>
#define BUFFSIZE 4000

int main()
{
    int pipefd[2];
    pid_t pid;
    if (pipe(pipefd) != 0)
    {
        perror("cannot create pipe");
    }
    pid = fork();
    if (pid == -1)
    {
        perror("cannot fork");
    }
    else if (pid == 0)
    {
        // child process
        close(pipefd[0]);
        int res = dup2(pipefd[1], STDOUT_FILENO);
        if (res != -1)
            execlp("lsblk", "lsblk", "--fs", "-o", "+MODEL,SIZE", "-J", NULL);
        else
        {
            perror("cannot redirect");
            exit(1);
        }
    }
    close(pipefd[1]);
    int status = -1;
    waitpid(pid, &status, 0);

    char buff[BUFFSIZE];
    ssize_t count = 0;
    count = read(pipefd[0], buff, BUFFSIZE - 1);
    if (count > 0)
        buff[count] = '\0';
    else
        perror("read error");

    // is there left data ?
    char test;
    count = read(pipefd[0], &test, 1);

    printf("%s\n", buff);
    if (count == 1)
        fprintf(stderr, "read incomplete data\n");

    close(pipefd[0]);

    return 0;
}