What is a file descriptor and what is it used for

Assignment Help Computer Engineering

Reference no: EM131876561

Problem

1. Explain the difference between system calls and library functions. What happens in the CPU when a system call is invoked?

2. Why must we immediately check the value of errno after a system call fails, rather than later?

3. What is a file descriptor, and what is it used for?

4. Check the man pages of open, dup, dup2, pipe, and fcntl and see if you find anything they have in common.

Reference no: EM131876561

Questions Cloud

How the open call can be used to emulate the function : Specify how the open call can be used to emulate the function performed by the shell's > and >> symbols.

What is the economic production quantity in bags : Healthy Plants Ltd. (HP) produces its premium plant food in 100-pound bags. Demand for the product is 100,000 pounds per week. HP operates 50 weeks per year.

Prepare a research report on a travel destination : You need a research report on a travel destination .The format is the essence of the project, Just fill in the appropriate sections with a few paragraphs.

Examining currently driving quality reform in healthcare : Healthcare reform is not necessarily new on the healthcare scene, yet it has become the major driver of change in recent years with continued industry.

What is a file descriptor and what is it used for : Why must we immediately check the value of errno after a system call fails, rather than later? What is a file descriptor, and what is it used for?

Discuss about the organizational theory and design : The changes will take place to fix the concerned areas the company faces. The solutions to the lack of new trendy clothes and limits on reaching customers.

What interesting observation can you make from the contents : Execute the command ls > newlist. What interesting observation can you make from the contents of newlist?

Discuss key compliance and accreditation issues : Healthcare budgeting is critically impacted by business compliance issues such as corporate compliance and accreditation.

Why error message is seen at terminal in spite of having use : Explain why the error message is seen at the terminal in spite of having used the 2> symbol: $ cat bar ksh: cannot open foo: No such file or directory.

User Account

All Pages