Custom C program & daemon for our Linux server

Description of [login to view URL] & [login to view URL] to write: ----------------------------------------------------- #1. A list file building program: This program written in C must be extremely fast as it is running on a server. It is imperative that it will not slow down the server while it is running. It will scan a specified parent directory plus all of its sub directories plus corresponding files and add them to a list file on the server in a directory called "/dirs-files-list (The parent directory is manually specified in a config file by the root user before the program can be run) An example parent directory in the list is [login to view URL] An example of a file in a sub directory in the list is /images/[login to view URL] Example of one directory & one file added to the list file by the C program is: ------------------------------------------------------------------------------- VERY IMPORTANT NOTE: Each file is added to the list with its sub directory (An existing parent directory) "[login to view URL]" (An existing file in a [login to view URL] sub directory) "/images/[login to view URL]" For reference an apache2 log file would show this: The directory: [login to view URL] - - [06/Dec/2015:06:40:59 -0500] "GET /[login to view URL] HTTP/1.1" 200 1445 "[login to view URL]" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:42.0) Gecko/20100101 Firefox/42.0" The file: [login to view URL] - - [06/Dec/2015:06:35:24 -0500] "GET /images/[login to view URL] HTTP/1.1" 200 28715 "[login to view URL]" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:42.0) Gecko/20100101 Firefox/42.0" Each directory has many files in it and also many sub directories too. So the actual list file created will be large. The list file created by the program will grow larger daily as the content in the parent & sub directories have more content. An example of this is a blog application on our server. Date completion pointer: Each time the list file scanning program runs and is finished it then needs to write and store a date completion pointer with the exact date and time of its last scan so that when the scanning program runs again it first looks at the last completion pointer date and it will not add duplicate records to the current list file. #2. Write a daemon: A daemon that checks to see if any files have been added to the parent directory and all of its sub directories. Then it tells the C program to run the scan and add the new sub directories and files to the list file.