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import setproctitle after forking on macOS #450

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import setproctitle after forking on macOS #450

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9 changes: 8 additions & 1 deletion mutmut/__main__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@
import signal
import subprocess
import sys
import platform
from abc import ABC
from collections import defaultdict
from configparser import (
Expand Down Expand Up @@ -55,7 +56,11 @@
import libcst as cst
import libcst.matchers as m
from rich.text import Text
from setproctitle import setproctitle

# do not import on macOS before forking, because this causes a segfault on newer versions (see #446)
# on other platforms, import before forking for a small performance gain (import takes some miliseconds; re-import later on is instant)
if platform.system() != 'Darwin':
from setproctitle import setproctitle

import mutmut
from mutmut.code_coverage import gather_coverage, get_covered_lines_for_file
Expand Down Expand Up @@ -1101,6 +1106,8 @@ def read_one_child_exit_status():
if not pid:
# In the child
os.environ['MUTANT_UNDER_TEST'] = mutant_name
# import for macOS (on other platforms, this re-import does nothing)
from setproctitle import setproctitle
setproctitle(f'mutmut: {mutant_name}')

# Run fast tests first
Expand Down