Bash File Copy

Build Instructions

The program was tested in Ubuntu~18.04 on gcc version 7.3.0

Using the Makefile

In the terminal in the project folder, run:

make

Building Manually

In the terminal in the project folder:

run:

gcc -I -Wall filecopy.c -o fc~

This compiles the file an exectuable:

fc

Run Instructions

In the terminal in the project folder, run:

./fc

Enter the desired file to copy at the first prompt.

Enter the desired output file at the second prompt.

strace/dtruss output

% time seconds usecs/call calls errors syscall

---

writing to files, called to copy to output and print messages to stdout

58.24 0.009821 16 616 write

reading from files, called to get input from files and get user input from stdin

41.58 0.007011 11 616 read

close files, deallocate file descriptors, unlock record locks owned by process

0.18 0.000031 8 4 close

returns information about files, used on open and close

0.00 0.000000 0 4 fstat

maps and unmaps files into device memory; used on open, (file creation?), and closing.

0.00 0.000000 0 5 mmap

sets protection on calling process's memory, used on open and close to set whether or not files can be read, written, or executed

0.00 0.000000 0 4 mprotect

deletes mappings for specified address range, called on termination

0.00 0.000000 0 1 munmap

changes the location of program break, controls heap/stack size

0.00 0.000000 0 3 brk

checks user permissions for a file

0.00 0.000000 0 3 3 access

executes a program

0.00 0.000000 0 1 execve

sets architecture thread state, gets and sets subfunctions

0.00 0.000000 0 1 arch_prctl

opens file relative to directory file descriptor, takes relative path whereas open uses wd

0.00 0.000000 0 4 openat

---

100.00 0.016863 1262 3 total