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Description:

processtracker 0.1.2

process-tracker
Process tracker enables tracking creation of child processes.
Usage:
import process_tracker; process_tracker.install()

import os

pid1 = os.fork()
pid2 = os.fork()
pid3 = os.fork()

if pid1 and pid2 and pid3:
print(process_tracker.children())

Prints a list of tuples with (pid, create_time) for each process.
create_time can be used to confirm that the current process (if any) with
the given pid is the same as the original. For example:
import process_tracker
import psutil

def get_create_time(ctime):
boot_time = psutil.boot_time()
clock_ticks = os.sysconf("SC_CLK_TCK")
return boot_time + (ctime / clock_ticks)

processes = []
for pid, create_time in process_tracker.children():
try:
p = psutil.Process(pid=pid)
except psutil.NoSuchProcess:
continue
if p.create_time() == get_create_time(create_time):
processes.append(p)

# processes now has the list of active child processes
# psutil itself does a check before sensitive operations that the
# active process create time is the same as when the Process object
# was initialized.
for p in processes:
p.terminate()

Limitations

Only tracks children spawned from dynamically-linked executables.
Relies on LD_PRELOAD so will not work for setuid/setgid executables.

Development
Basic

python -m venv .venv
.venv/bin/python -m pip install tox
Make changes
.venv/bin/python -m tox

Debugging C build
Avoids overhead of making sdist

As above
make c-build

Debugging issues from sub-process
gdb debugging of sub-processes.

As above
make debug

Debugging tests without rebuild

As above
.venv/bin/python -m pip install . .[dev]

Then

pip install . && pytest when rebuild is needed
pytest when only tests changed

Release
docker run \
-e REAL_UID=$(id -u) \
-e REAL_GID=$(id -g) \
-v "$PWD/scripts/build.sh:/build.sh" \
-v "$PWD:/src" \
dockcross/manylinux1-x64 \
sh -c 'cd /src && env "PATH=/opt/python/cp37-cp37m/bin:$PATH" /build.sh'