1/* mcat0.c JM 2 * repoduces the basic function of cat 3 S*/ 4 5 int open(char *filename, ...); 6 long read (int fd, void *buffer, unsigned long byte_count); 7 long write(int fd, void *buffer, unsigned long byte_count); 8 int close(int fd); 9 10 int main(int argc, char *args[]) { char buffer; 11 12 13 14 15 16 17} 18 19 20 21} open (args[1], 0); while (read(3, &buffer, 1) > 0) { write(1, &buffer, 1); close (3); return 0;

1/* mcat0.c JM 2 * repoduces the basic function of cat 3 S/ 4 5 int open(char filename, ...); 6 long read (int fd, void buffer, unsigned long byte_count); 7 long write(int fd, void buffer, unsigned long byte_count); 8 int close(int fd); 9 10 int main(int argc, char *args[]) { char buffer; 11 12 13 14 15 16 17} 18 19 20 21} open (args[1], 0); while (read(3, &buffer, 1) > 0) { write(1, &buffer, 1); close (3); return 0;

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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Question

Hello, I need help completing and understanding this data flow diagram for this program that reads from a file and writes to the terminal screen.

1/* mcat0.c JM
2* repoduces the basic function of cat
3 S*/
4
5 int open(char *filename, ...);
6 long read (int fd, void *buffer, unsigned long byte_count);
7 long write(int fd, void *buffer, unsigned long byte_count);
8 int close(int fd);
9
10 int main(int argc, char *args[]) {
char buffer;
11
12
13
14
15
16
17}
18
19
20
21}
open (args [1], 0);
while (read (3, &buffer, 1) > 0) {
write(1, &buffer, 1);
close (3);
return 0;
CS212
Data-flow Diagram for mcato filel
user space
system space
hardware
hard disk
file1
mcat0
1
data-flow diagram
terminal
screen
keyboard

Process by which instructions are given to a computer, software program, or application using code.

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