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Problem 12 (msh) Bookmark this page Changing Directories Can the effect that the command cd has in bash be accomplished in our mini-shell, msh, by forking and making the system call chdir(new_directory_path) in the child process? In order to find out, write a program called newdir which makes this system call, and call it from msh6. Yes! No! Submit Exiting msh You have used 0 of 1 attempt A proposal to the problem of exiting the shell is to have keyboard control codes (such as ctrl-C) not kill the shell by making the (parent) shell ignore those signals. If just this is done, these control codes do not terminate the shell. How, in this situation, can we exit the shell? Does the following plan provide a solution to this problem? In this case we can exit the shell by sending the shell command exit to the child process for execution. In order to find out, experiment with msh6. This plan will work. Save This plan will not work.

Problem 12 (msh) Bookmark this page Changing Directories Can the effect that the command cd has in bash be accomplished in our mini-shell, msh, by forking and making the system call chdir(new_directory_path) in the child process? In order to find out, write a program called newdir which makes this system call, and call it from msh6. Yes! No! Submit Exiting msh You have used 0 of 1 attempt A proposal to the problem of exiting the shell is to have keyboard control codes (such as ctrl-C) not kill the shell by making the (parent) shell ignore those signals. If just this is done, these control codes do not terminate the shell. How, in this situation, can we exit the shell? Does the following plan provide a solution to this problem? In this case we can exit the shell by sending the shell command exit to the child process for execution. In order to find out, experiment with msh6. This plan will work. Save This plan will not work.

Database System Concepts
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 12 (msh) Bookmark this page Changing Directories Can the effect that the command cd has in bash be accomplished in our mini-shell, msh, by forking and making the system call chdir(new_directory_path) in the child process? In order to find out, write a program called newdir which makes this system call, and call it from msh6. Submit Exiting msh Yes! No! ( A proposal to the problem of exiting the shell is to have keyboard control codes (such as ctrl-C) not kill the shell by making the (parent) shell ignore those signals. If just this is done, these control codes do not terminate the shell. How, in this situation, can we exit the shell? Does the following plan provide a solution to this problem? In this case we can exit the shell by sending the shell command exit to the child process for execution. In order to find out, experiment with msh6. You have used 0 of 1 attempt Problem 11 (Merlin, Batman, and Madmax) Bookmark this page } What's in that file? This plan will work. This plan will not work. 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("Merlin versus "); fflush(stdout); close (1); if (fork() > 0) execlp("./batman", "./batman", (char*)0); execlp("./madman", "./madman", (char*)0); return 42; else Here are the two programs called by arrow: /* batman.c */ int main(void) { open("file1",02001); printf("Batman "); fflush(stdout); return 24; /* madman.c */ int main(void) { open("file1", 1); printf("Madmax "); fflush(stdout); return 24; After the program runs what does the command echo $? produce? Save Character for character file1 contains exactly the characters:
Transcribed Image Text:Problem 12 (msh) Bookmark this page Changing Directories Can the effect that the command cd has in bash be accomplished in our mini-shell, msh, by forking and making the system call chdir(new_directory_path) in the child process? In order to find out, write a program called newdir which makes this system call, and call it from msh6. Submit Exiting msh Yes! No! ( A proposal to the problem of exiting the shell is to have keyboard control codes (such as ctrl-C) not kill the shell by making the (parent) shell ignore those signals. If just this is done, these control codes do not terminate the shell. How, in this situation, can we exit the shell? Does the following plan provide a solution to this problem? In this case we can exit the shell by sending the shell command exit to the child process for execution. In order to find out, experiment with msh6. You have used 0 of 1 attempt Problem 11 (Merlin, Batman, and Madmax) Bookmark this page } What's in that file? This plan will work. This plan will not work. 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("Merlin versus "); fflush(stdout); close (1); if (fork() > 0) execlp("./batman", "./batman", (char*)0); execlp("./madman", "./madman", (char*)0); return 42; else Here are the two programs called by arrow: /* batman.c */ int main(void) { open("file1",02001); printf("Batman "); fflush(stdout); return 24; /* madman.c */ int main(void) { open("file1", 1); printf("Madmax "); fflush(stdout); return 24; After the program runs what does the command echo $? produce? Save Character for character file1 contains exactly the characters:
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