Reddit mentions of Writing Security Tools and Exploits

Yes.

Hacking Exposed

Shellcoders Handbook

Reverse Engineering

Malware Analyst's Cookbook

Gray Hat Python

Gray Hat Hacking Second Edition

Writing Security Tools & Exploits

Sockets, Shellcode, Porting and Coding: Reverese Engineering Exploits and Tool Coding for Security Professionals

Professional Penetration Testing

These are definitely some books you could start with. Once you've gone through those, you'll know more then a lot of them out there :)

There's these reddit threads on r/netsec:
http://www.reddit.com/r/netsec/comments/d3hua/how_to_get_started_in_netsec/
http://www.reddit.com/r/netsec/comments/ekyjw/interested_in_learning_about_network_security/

http://www.reddit.com/r/netsec/comments/es4si/what_are_some_good_netsec_books_out_there/
http://www.reddit.com/r/netsec/comments/g6r71/getting_started_in_network_security_a_list_of/

There's also loads of blogs and websites around, if you go hunting or look at some of these netsec threads, you'll find loads more material.

The following books might be old but still way better in writing backdoors and hacking stuff:
https://www.amazon.com/Sockets-Shellcode-Porting-Coding-Professionals/dp/1597490059/ref=sr_1_1?ie=UTF8&qid=1479315418&sr=8-1&keywords=shellcode+c

https://www.amazon.com/gp/product/1597499978/ref=pd_bxgy_14_img_2?ie=UTF8&psc=1&refRID=PH1DKACHVPSSV5Z4R7E9

https://www.amazon.com/gp/product/1932266674/ref=pd_bxgy_14_img_3?ie=UTF8&psc=1&refRID=PH1DKACHVPSSV5Z4R7E9

Best Regards