not something I've ever dealt with so ignore me if someone else has a real answer, but as a work-around could you pass file descriptors as command args? On Fri, Feb 13, 2026, 4:35 PM Swaren < haskell-mailing-list.eastward826@passmail.net> wrote:
Hi!
I'm new to Haskell, and I have a problem with the `createProcess` function (used to spawn a new Unix process) and FDs.
The function takes a `CreateProcess` data structure, which contains `std_in`, `std_err` and `std_out`, plus other unrelated parameters. These std parameters allow to give specific file descriptors to the child process (0, 1 and 2, which are the standard std FDs). This feature allows to capture the output of processes, or provide them input, by giving them a pipe as std_in and std_out, for example.
Now, is there a way to define other file descriptors? Like, having 5 more input pipes for the process to use. Currently, the `CreateProcess` API seems to be limited to the first three FDs.
I could disable the `close_fds` arg of `CreateProcess`, so that all the FDs are given to the process, but that's not truly a solution as it allows the process to access other FDs of my program.
Maybe there's a library for that, tell me, but I'd like to keep it the most "native" / built-in as possible. (plus, for some reason, it would be a pain to install a proper Haskell toolchain on my Frankenstein-like Linux machine)
Hope it's clear enough, thanks!
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