Unix Systems Programming

Define and explain:

i) SIGCHLD signal

Explain the following:

i) orpbaned process

Explain the following:

ii) zombie process

Explain the following:

iii) terminal login

Explain the following:

iv) network login.

Explain :

 i) process group

Explain :

ii) session.

What is daemon? Explain characteristics and coding rules.

Write a C/C++ program to show the use of alarm API.

What is race condition? Mention and explain routines to avoid race condition. 

Define and explain:

ii) waitpid function.

What is inter-process communication? List any 4 mechanisms (IPC). Also write a C/C++program that creates a child process to print a message.

Write a C/C++ program(s) to implement inter-process communication using FIFO file.

Explain briefly with examples:

i) Message queues

Explain briefly with examples:

ii) semaphores.

Explain shared memory as an inter-process mechanism (IPC).

What are steam pipes? Explain passing of file descriptors.

Briefly explain client-server functions.

Explain API with their prototypes. :

ii) read

List and explain feature test macros in POSIX systems

Compare : execution of an API with execution of C library function. Also list any four error status codes with their meaning. 

What is file? Explain types of files with command examples.

Explain UNIX Kernel support for files with a neat sketch.

Write differences between

i) Hard links and soft links 

Write differences between

ii) C steam pointer and file descriptor.

Explain file and record locking with C/C+-program.

Explain API with their prototypes. :

i) open

Compare and explain : ANSI C and K and RC with examples.

Explain API with their prototypes. :

iii) write

Explain API with their prototypes. :

iv) close.

Write a C/C++ program to rename a file (use my command /link and unlink APIs).

With a neat diagram, explain about termination ways for a process. Also write a C/C++programs to display:

i) Command line argument.

With a neat diagram, explain about termination ways for a process. Also write a C/C++programs to display:

ii) Environment variables.

Explain setjmp and longjmp functions with their prototypes. 

With neat sketch, explain memory structure/ layout of a C/C++ program that is to be executed.