Re: 12.2: fork() causing getline() to repeat stdin endlessly

[Max Nikulin <manikulin@gmail.com>]

On 25/10/2023 02:19, Greg Wooledge wrote:
> At this point I still don't know *why* glibc rewinds stdin 
> intermittently on exit().

Consider a parent process that reads some file. When a specific keyword 
appears there, it should start a child that parses the same file till 
another keyword. When the child exits the parent continues reading the 
the file from the point where the child stopped.

Buffered input in child may cause offset beyond the point where the 
child faced terminating keyword. It is reasonable to rewind the input 
file to the position just after last string actually processed by the child.

So flush on exit looks like a way to make applications a bit more 
reliable. However the price is that developers must be careful with fork.