Operating System Lab 2: File Management and Protection

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What is the purpose of the Open system call in file manipulation?

To close an open file descriptor

To append new information to the beginning of the file

To create a new empty file

To open a file for reading, writing, or both (correct)

What is the flag used to open a file for writing only?

O_RDONLY

O_WRONLY (correct)

O_RDWR

O_APPEND

What is the purpose of the Close system call in file manipulation?

To close an open file descriptor (correct)

To open a file for reading

To append new information to the end of the file

To create a new empty file

What is the flag used to create a new file if it does not exist?

O_CREAT Signup and view all the answers

What is the flag used to initially clear all data from a file?

O_TRUNC Signup and view all the answers

What is the mode used to open a file for reading and writing?

O_RDWR Signup and view all the answers

What is the purpose of the O_EXCL flag when combined with O_CREAT?

To ensure that the caller must create the file Signup and view all the answers

What is the flag used to append new information to the end of a file?

O_APPEND Signup and view all the answers

What system call is used to open a file in C?

open Signup and view all the answers

Which header file is required to include for using the open system call?

#include Signup and view all the answers

What flag should be used with the open system call to create a new file if it does not exist?

O_CREAT Signup and view all the answers

What is the correct way to handle an error in opening a file?

if (fd < 0) Signup and view all the answers

What does the write system call return upon successful execution?

The number of bytes written Signup and view all the answers

What argument does the write system call NOT take?

File path Signup and view all the answers

Which system call is used to close an open file descriptor?

close Signup and view all the answers

Which function must be used to avoid buffer overflow while writing a string to a file?

strlen Signup and view all the answers

Which system call is used to open a file in the C programming language?

open() Signup and view all the answers

What is the purpose of the write() system call?

To write data to a file Signup and view all the answers

Which header file is required to use the open() system call in a C program?

#include Signup and view all the answers

How are file permissions for the owner, group, and others specified in the chmod function?

S_IRWXU, S_IRWXG, S_IRWXO Signup and view all the answers

What happens when the close() system call is invoked?

It closes an open file descriptor Signup and view all the answers

In the context of the chmod function, what does S_IWUSR represent?

Write permission for the user Signup and view all the answers

What is the correct function definition for the write() system call?

ssize_t write(fd, void *buf, size_t nbytes) Signup and view all the answers

Which system call would be used to modify the owner and group of a file?

chown Signup and view all the answers