This is regarding Linux System calls using C syntax Problem 11 (Merlin, Batman, and Madman)Bookmark this pageWhat's in that file?Assume that file1 exists and is empty. Consider what happens when the the program arrow is run./* arrow.c */int main(void) {}close (1);open ("file1", 1);}printf("Madman versus Arrow!"); fflush(stdout);close (1);if (fork() > 0) {wait (NULL);execlp("./batman", "./batman", (char*)0);}else}execlp("./merlin", "./merlin", (char*)0);Here are the two programs called by arrow :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

Solution: a) After the program runs what does the command echo $ contains? The correct answer is…

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

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Problem 3. This problem is about the same file foo as in the previous problem, but before it is modified. A program opens it for reading and gets back the file descriptor number fd. The program has a character array char buf [30]. The program now does the following: if ((rv = read (fd, buf,20)) < 0) { ...handle error... } if ((rv = read(fd,buf,20)) < 0) { ...handle error...} a. What does each call return (assuming no errors)? b. What do the first 20 bytes of the character array buf contain after the second read call? c. What do the last 10 bytes of buf contain?
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