File py314.patch of Package python-capturer

From 3d0a9a040ecaa78ce2d39ec76ff5084ee7be6653 Mon Sep 17 00:00:00 2001
From: Scott K Logan <logans@cottsay.net>
Date: Wed, 16 Jul 2025 15:58:09 -0500
Subject: [PATCH] Prefer multiprocessing 'fork' start method if available

The default multiprocessing start method for Linux changed in Python
3.14 from 'fork' to 'forkserver'. Because capturer relies on sharing
file descriptors, only 'fork' can be used. Prefer that start method
specifically (if the platform supports it).
---
 capturer/__init__.py | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/capturer/__init__.py b/capturer/__init__.py
index 407ba26..9f98950 100644
--- a/capturer/__init__.py
+++ b/capturer/__init__.py
@@ -136,6 +136,10 @@ class MultiProcessHelper(object):
     def __init__(self):
         """Initialize a :class:`MultiProcessHelper` object."""
         self.processes = []
+        try:
+            self.context = multiprocessing.get_context('fork')
+        except ValueError:
+            self.context = multiprocessing.get_context()
 
     def start_child(self, target):
         """
@@ -146,8 +150,8 @@ def start_child(self, target):
                        :class:`multiprocessing.Event` to be set when the child
                        process has finished initialization.
         """
-        started_event = multiprocessing.Event()
-        child_process = multiprocessing.Process(target=target, args=(started_event,))
+        started_event = self.context.Event()
+        child_process = self.context.Process(target=target, args=(started_event,))
         self.processes.append(child_process)
         child_process.daemon = True
         child_process.start()
@@ -309,7 +313,7 @@ def start_capture(self):
             # Capture (and most likely relay) stdout/stderr as separate streams.
             if self.relay:
                 # Start the subprocess to relay output.
-                self.output_queue = multiprocessing.Queue()
+                self.output_queue = self.context.Queue()
                 self.start_child(self.merge_loop)
             else:
                 # Disable relaying of output.