把管道作爲標準輸入輸出

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

int main()
{
    int data_processed;
    int file_pipes[2];
    const char some_data[] = "123";
    pid_t fork_result;

    if (pipe(file_pipes) == 0) 
    {
        fork_result = fork();
        if (fork_result == (pid_t)-1)
        {
            fprintf(stderr, "Fork failure");
            exit(EXIT_FAILURE);
        }

        if (fork_result == (pid_t)0)
        {
            close(0);
            dup(file_pipes[0]);
            close(file_pipes[0]);
            close(file_pipes[1]);

            execlp("od", "od", "-c", (char *)0);
            exit(EXIT_FAILURE);
        }
        else 
        {
            
            close(1);
            dup(file_pipes[1]);
	    	close(file_pipes[0]);
            close(file_pipes[1]);
/*
            data_processed = write(file_pipes[1], some_data,
                                   strlen(some_data));
            close(file_pipes[1]);

            printf("%d - wrote %d bytes\n", (int)getpid(), data_processed);
*/
	    printf("hello world");
	    
        }
    }
    exit(EXIT_SUCCESS);
}

父進程的標準輸出作爲管道的寫端，子進程的標準輸入作爲管道的讀端