char buffer [BUFSIZE]; int fd = open("fooey",0_WRONLY|O_CREAT|O_TRUNC,0777); strcpy(buffer, "First data"); write(fd, buffer, strlen(buffer)); 1seek (fd, 90, SEEK_SET); strcpy(buffer, "Second data"); write(fd, buffer, strlen(buffer)); 1seek (fd, 100, SEEK_END); strpcy (buffer, "Third data"); write(fd, buffer, strlen(buffer)); close(fd); a. What is the size of the file at the end of this section of code? b. Describe the contents of the file say exactly what byte offsets contain actual data, and what offsets constitute "holes". c. Why might holey files be useful? d. Suppose, after the above sequence of writes, the same program opens the file for reading and then does:

char buffer [BUFSIZE]; int fd = open("fooey",0_WRONLY|O_CREAT|O_TRUNC,0777); strcpy(buffer, "First data"); write(fd, buffer, strlen(buffer)); 1seek (fd, 90, SEEK_SET); strcpy(buffer, "Second data"); write(fd, buffer, strlen(buffer)); 1seek (fd, 100, SEEK_END); strpcy (buffer, "Third data"); write(fd, buffer, strlen(buffer)); close(fd); a. What is the size of the file at the end of this section of code? b. Describe the contents of the file say exactly what byte offsets contain actual data, and what offsets constitute "holes". c. Why might holey files be useful? d. Suppose, after the above sequence of writes, the same program opens the file for reading and then does:

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Array

The simplest way to start thinking about an array is as a collection, or a set of elements. In programming, these elements may be constants, variables, functions and pointers.

Question

just do part d

char buffer [BUFSIZE];
int fd = open("fooey", O_WRONLY|O_CREAT|O_TRUNC,0777);
strcpy(buffer, "First data");
write(fd, buffer, strlen(buffer));
1seek (fd, 90, SEEK_SET);
strcpy (buffer, "Second data");
write(fd, buffer, strlen(buffer));
1seek (fd, 100, SEEK_END);
strpcy (buffer, "Third data");
write(fd, buffer, strlen(buffer));
close(fd);
a. What is the size of the file at the end of this section of code?
b. Describe the contents of the file say exactly what byte offsets contain actual data, and what
offsets constitute "holes".
c. Why might holey files be useful?
d. Suppose, after the above sequence of writes, the same program opens the file for reading and
then does:

1seek (rfd, 130, SEEK_SET); read (rfd, buffer, 40);
What will the read return, and what (if anything) will be placed in buffer?

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