WSU Vancouver - CS360 - File Systems

Systems Programming - Assignment 3 - reading files recusively

C/File System Recusion Program

Abstract

This program does the following:

• Takes one or zero command line arguments.
• Argument, if present, is a pathname (relative or absolute). If no argument is present, the pathname of the present working directory is assumed (getcwd).
• recursively traverses the directories and their files, starting with the pathname, and lists every regular file that is readable by the current process.
• each regular file is listed to stdout as a full pathname, ne pathname per line.
• No order is defined for the pathnames that are output.

Other:

• Ignore symbolic links (Why?) - Symbolic link loop - Symoblic link to parent directory

C Functions Used:

• chmod - change directory
• access - check user's permissions for a file
• opendir - open a directory
• readdir - read a directory
• closedir - close a directory
• lstat - get file status

Requirements

GNU C and GNU make

Executing

    make
    ./readable <optional pathname>

to clean the project when done:

    make clean

Note

Better solutions exist, but constrained because of the restrictions of the assignment. Modern methods of file traversing can be found online, _BSD_SOURCE traversial is not recommended nor safe for production code.