问fork()中filedescriptor的行为

EN

#include<stdio.h>
#include<fcntl.h>

main()
{
int fp;
char buff[11];
int pid;
fp = open("file1.txt", O_RDONLY);
pid = fork();
if(pid==0)
{
    printf("Child begins %d\n", getpid());
    read(fp, buff, 5);
    buff[10] = '\0';
    printf("Child read:");
    puts(buff);
    printf("Child exiting\n");
}
else
{
    read(fp, buff, 5);
    buff[10] = '\0';
    printf("Parent read:");
    puts(buff);
    printf("Parent exiting\n");
}
 }