Description
Assignment 1(a):-
a) Write a C program to create a child process using the system
call fork( ) and from the child process, display the PID and PPID and
also display the same from parent process. Demonstarte the use of
exit(0) and exit(1).
Hints:
* There is a system call available in the LINUX to create a child
process called fork( ). Again the fork( ) system call returns the PID
of the child process to the parent process and returns the value 0 to
the child process. Moreover the return value type of the fork( ) system
call is pid_t.
* For fork( ) system call , you need a header file
#include
* To get the PID and PPID , we have two more system call getpid(
) and getppid( ) and the return types of both are int.
Assignment 1(b):-
Write a C program like the assignment 1(a). But here use the
system call wait() system to synchronize the execution of parent
program in your program until child process finishes.
Hints:
* For wait( ) system call , you need a header file
#include
Assignment 1(c):-
Write a C program like the assignment 1(b). and overlay a user
degined program into the address space of the child process using
execv() system call.Again use wait() system call to synchronize
the execution of parent program in your program until child
process finishes.Here use the macro WIFEXITED to capture the
returned status of the child in parent process. Also demonstarte
the use of argument vector to print the program name by the child
process.
