Problem 11 (Merlin, Batman, and Madman) Bookmark this page What's in that file? Assume that file1 exists and is empty. Consider what happens when the the program arrow is run. int main(void) { /* arrow.c */ } close (1); open("file1",1); printf("Madman versus Arrow!"); fflush(stdout); close (1); if (fork() > 0) { wait (NULL); execlp("./batman", "./batman", (char*)0); } } else Here are the two programs called by arrow: execlp("./merlin", "./merlin", (char*)0); return 42; /* batman.c */ int main(void) { open("file1", 1); printf("Batman"); close (1); return 24; /* merlin.c */ int main(void) { open("file1", 1); printf("Merlin"); close (1); return 24; fflush(stdout); fflush(stdout); After the program runs what does the command echo $? produce? Character for character file1 contains exactly the characters: Save
Problem 11 (Merlin, Batman, and Madman) Bookmark this page What's in that file? Assume that file1 exists and is empty. Consider what happens when the the program arrow is run. int main(void) { /* arrow.c */ } close (1); open("file1",1); printf("Madman versus Arrow!"); fflush(stdout); close (1); if (fork() > 0) { wait (NULL); execlp("./batman", "./batman", (char*)0); } } else Here are the two programs called by arrow: execlp("./merlin", "./merlin", (char*)0); return 42; /* batman.c */ int main(void) { open("file1", 1); printf("Batman"); close (1); return 24; /* merlin.c */ int main(void) { open("file1", 1); printf("Merlin"); close (1); return 24; fflush(stdout); fflush(stdout); After the program runs what does the command echo $? produce? Character for character file1 contains exactly the characters: Save
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
Related questions
Question
This is regarding Linux System calls using C syntax
![```markdown
Problem 11 (Merlin, Batman, and Madman)
What's in that file?
Assume that `file1` exists and is empty. Consider what happens when the program `arrow` is run.
/* arrow.c */
```c
int main(void) {
close(1);
open("file1", 1);
printf("Madman versus Arrow\n"); fflush(stdout);
close(1);
if (fork() > 0) {
wait(NULL);
execlp("./batman", "./batman", (char*)0);
}
else
execlp("./merlin", "./merlin", (char*)0);
return 42;
}
```
Here are the two programs called by `arrow`:
/* batman.c */
```c
int main(void) {
open("file1", 1);
printf("Batman"); fflush(stdout);
close(1);
return 24;
}
```
/* merlin.c */
```c
int main(void) {
open("file1", 1);
printf("Merlin"); fflush(stdout);
close(1);
return 24;
}
```
After the program runs what does the command `echo $?` produce?
[ ]
Character for character `file1` contains exactly the characters:
[ ]
Save
```](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd84c1829-b5be-42b1-ba72-3bae7a546286%2F15f967cd-646c-4c17-817c-a170c1b4e404%2Fgjge6cw_processed.png&w=3840&q=75)
Transcribed Image Text:```markdown
Problem 11 (Merlin, Batman, and Madman)
What's in that file?
Assume that `file1` exists and is empty. Consider what happens when the program `arrow` is run.
/* arrow.c */
```c
int main(void) {
close(1);
open("file1", 1);
printf("Madman versus Arrow\n"); fflush(stdout);
close(1);
if (fork() > 0) {
wait(NULL);
execlp("./batman", "./batman", (char*)0);
}
else
execlp("./merlin", "./merlin", (char*)0);
return 42;
}
```
Here are the two programs called by `arrow`:
/* batman.c */
```c
int main(void) {
open("file1", 1);
printf("Batman"); fflush(stdout);
close(1);
return 24;
}
```
/* merlin.c */
```c
int main(void) {
open("file1", 1);
printf("Merlin"); fflush(stdout);
close(1);
return 24;
}
```
After the program runs what does the command `echo $?` produce?
[ ]
Character for character `file1` contains exactly the characters:
[ ]
Save
```
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 2 steps with 2 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Recommended textbooks for you
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
C How to Program (8th Edition)
Computer Science
ISBN:
9780133976892
Author:
Paul J. Deitel, Harvey Deitel
Publisher:
PEARSON
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781337627900
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Programmable Logic Controllers
Computer Science
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education