Write program in C, (to be used in Unix OS). I already have most of the code, please add to the code already given to get the program to run. Also provide a screenshot of the output.

Please do not copy from another source. I will upvote the correct answer, thanks!

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Lab Instructions:

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Given Code:

#include

#include

#include

#include

#include

#include

// Function ptototypes

int readX();

void writeX(int);

int main()

{

int pid; // pid: used to keep track of the child process

int x = 19530; // x: our value as integer

int i; // iterator

// Write x to file

writeX(x);

// output inital value to the screen

printf("x = %d ", x);

// loop 5 times

for( i = 0; i

{

// output the current loop iteration

printf(" ITERATION %d ", i+1);

// Add code here

}

exit(0);

}

/// Returns the value read from .shareX.dat

int readX()

{

char xChar[10]; // xChar: our value as a char

int fd; // fd: file descriptor

// open to read and store x

if ( (fd = open(".shareX.dat", O_RDONLY )) == -1 )

{

perror("Error opening file");

exit(2);

}

// read xChar from the file

if ( read(fd, xChar, 10) == -1 )

{

perror("Error reading file");

exit(3);

}

// close file for reading

close(fd);

// convert xChar to int and return

return atoi(xChar);

}

/// Writes the writeX value to the file .shareX.dat

void writeX(int writeX)

{

char xChar[10]; // xChar: our value as a char

int fd; // fd: file descriptor

int xBytes; // how much to write

// open, clear, and create file if not createdi

if ( (fd = open(".shareX.dat",

O_CREAT | O_TRUNC | O_WRONLY, 0644 )) == -1 )

{

perror("Error opening file");

exit(4);

}

// convert x to char

xBytes = sprintf(xChar, "%d", writeX);

// put xChar in file

if ( write(fd, xChar, xBytes) == -1 )

{

perror("Error writing to file");

exit(5);

}

// close the file for writing

close(fd);

return;

}

Implement a program that will communicate the value of an integer x, between processes. You can do this using a file to store the value of x, or you can use shared memory with shmget or mmap. Shared memory is out of the scope of this class, so you will have to teach yourself how to use it, however if you put in the effort to learn, it results in simpler more elegant code. x will start with the value 19530, and you must print that value. Then you will loop 5 times where in each loop: the child goes first and subtracts 5 from x, the parent then divides x by 5, and both processes print who they are and their result of x after the operation. If you use a file and not shared memory, then during each iteration of the loop both processes must get the value of x from the file, and store the resulting value of x to the file. wait() is a required function call, so you will need to create a new process, and terminate it each time through the loop The following system calls are required for this lab fork(.) wait() he following functions may be useful for this lab: open), read), write() sleep(): make the process wait for a number of seconds atoi): converts string to integer sprintf O: can be used to convert integer to string