[Rpm-maint] [rpm-software-management/rpm] Signal Handling (Discussion #3150)

[Neale Ferguson]

If I establish signal handlers prior to invoking an RPM function then when I return from that function the signal handlers are no longer "active". For example,
```
import rpm
import sys
import signal

def signal_handler(__signo, __stack):
    print("Signaled")
    sys.exit(1)

signal.signal(signal.SIGTERM, signal_handler)

ti = rpm.TransactionSet()
mi = ti.dbMatch("name", "docker-ce")
for h in mi:
    print(h)
    break

signal.signal(signal.SIGTERM, signal_handler)

while True:
    pass
```
If I move the `signal.signal(...` to before the `while` loop then it works as expected.

I installed `rpm` via `pip3 install rpm`.

Is there a call I should be making to clean up the RPM environment that would restore my signal handler?

Thanks... Neale

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