process.c: read_process_output: hard coded 4096 bytes read limit

[Miguel Guedes <miguel.a.guedes@gmail.com>]

Hello List,

In process.c, function read_process_output, all reads are limited to a 
maximum of 4096 bytes.  What is the rationale behind imposing a hardcoded 
limit of 4096 bytes per read from a process channel? (why isn't the 
user allowed to specify this read limit when creating a process/
connection?)

A minor mode I've written that sometimes receives 500-800KB of data as a 
response from an async network connection (opened via make-network-
process) takes several seconds to fully receive the data due to the hard 
coded limit mentioned above and the fact that emacs waits between reads  
(probably in wait_reading_process_output upon receiving a signal in 
sigchld_handler).

-- 
Miguel