The parent process will open the file using openO before the fork. The first child will

write the content of buf$[0]$ into the file. Then the second child will write the content of

buf $1$I Write a C program where two child processes are created using fork$().$ The parent process

and child processes all write into a shared file using system call write$().$ The file name is

given from command line.

Define three strings like this:

buf$[0]=$ "EXAM! EXAM! EXAM!

$"$;

buf$[1]=$ "HELP! HELP! HELP!

$"$;

buf$[2]=$ "STUDY! STUDY! STUDY!

$"$;

The parent process will open the file using open$()$ before the fork. The first child will

write the content of buf$[0]$ into the file. Then the second child will write the content of

buf$[1]$ into the file. Finally, the parent will write the content of buf$[2]$ into the file and

close the file. Add sleep$(5)$ after each write$()$ statement.

Use signal to coordinate the access to the shared file, so that the file is accessed with

mutual exclusion.

In addition to writing to the file, both parent and child processes should also write some

related information to the terminal. Can you use signal$()$when writing the code