Programming Asiignment 3 help

1. You are strongly recommended to create a dedicated directory cp367a3 for this assignment, and
navigate to the directory cp367a3 where you want to store your work.

2. How to zip your directory a3.
under dirctory cp367a3
zip -r cp367_a3_XXXX#### unixio.c a3output.txt systemcall.txt
where XXXX####  is your Laurier's email ID

3. You may refer to the following program design to complete the lab programming assignment 3.
You'll need to Complete the main() function so that the program runs as required by adding missing pieces of code in your implementation.

#include <fcntl.h> // open
#include <unistd.h> // read
#include <sys/types.h> // read
#include <sys/uio.h> // read
#include <stdio.h> // fopen, fread
#include <stdlib.h>
#include <sys/time.h> // gettimeofday

struct timeval start, end; // maintain starting and finishing wall time.

void startTimer( ) { // memorize the starting time
        gettimeofday( &start, NULL );
}

void stopTimer( char *str ) { // checking the finishing time and computes the elapsed time
        gettimeofday( &end, NULL );
printf("%s's elapsed time\t= %ld\n",str, ( end.tv_sec - start.tv_sec ) * 1000000 + (end.tv_usec - start.tv_usec ));

}

int main( int argc, char *argv[] ) {

int typeofcalls;
// validate arguments
// // implementation

// Parsing the arguments passed to your C program
// Including the number of bytes to read per read( ) or fread( ), and
// the type of i/o calls used
// implementation

//
if (typeofcalls == 1) {
// Use unix I/O system calls to
// implementation

} else if (typeofcalls == 0) {
// Use standard I/O
// implementation
}

return 0;
}

4. After you finish your program, you can do the following tests to check if your program works correctly.

For the testing purpose, you first need to create a file with a specific size, for example, using the truncate utility. As shown below, you can shrink or extend the size of a file named filename to 1M by using truncate. If the filename doesn't exist, it will be created

truncate -s 1M filename

Learn the syntax of the truncate utility using the man command
man truncate

- compile and test

$gcc -o unixio unixio.c
$./unixio filename 1024 1

- batch test: create a bash shell script named t.sh with following content:

#!/bin/bash
buffersize=(1 256 512 1024 2048 2096)
## Start testing
for value in ${buffersize[*]}
do
## Testing Unix I/O system calls
tcommando="./unixio filename $value 1"
eval $tcommando
## Testing C calls
tcommando="./unixio filename $value 0"
eval $tcommando
done
## Testing is done! :-)

Note that you need to set up proper permissions on the above testing script before you execute the script, for example,
chmod +x script.sh
, which allows everyone to execute the script.

Then, enter
./t.sh

Assume you have successfully executed your program and your program passes your tests, please record your execution output when reading a file by 1, 256, 512, 1024, 2048, and 2096 bytes and save your execution output into a file named a3output.txt by entering
./t.sh>a3output.txt

Also, you need to test the following abnormal situations to see whether your program is robust to handle these abnormal situations
• Invalid number of arguments
• A file argument that does not exist
• Invalid number of bytes (or buffer size) to read per read( ) or fread( ), for example, negative number of bytes
• The type of I/O calls entered is invalid