Why does forking my process cause the file to be read infinitely

Question

I\'ve boiled down my entire program to a short main that replicates the issue, so forgive me for it not making any sense.

input.txt is a text file that has a couple

Answer 1

Replace exit(0) with _exit(0), and all is fine. This is an old unix tradition, if you are using stdio, your forked image must use _exit(), not exit().