Menu
Is it possible to find out the process id of the process which has caused some signal. In my scenario, I have multiple children of a process running, and I want to know which one of them sent the signal.
887
To know the PID of the process which sent a signal, set options=SA_SIGINFO , and use a sa_sigaction callback instead of sa_handler ; it will receive a siginfo_t struct, having a si_pid field. You can associate a data to the signal using sigqueue .
In this quick article, we've explored how to get the name and the command line of a given PID in the Linux command line. The ps -p <PID> command is pretty straightforward to get the process information of a PID. Alternatively, we can also access the special /proc/PID directory to retrieve process information.
The easiest way to find out if process is running is run ps aux command and grep process name. If you got output along with process name/pid, your process is running.
It is (finally!) very simple with python 3.
The following is tested with python 3.3.3:
#! /usr/bin/python3
import signal
import time, os
def callme(num, frame):
pass
# register the callback:
signal.signal(signal.SIGUSR1, callme)
print("py: Hi, I'm %d, talk to me with 'kill -SIGUSR1 %d'"
% (os.getpid(),os.getpid()))
# wait for signal info:
while True:
siginfo = signal.sigwaitinfo({signal.SIGUSR1})
print("py: got %d from %d by user %d\n" % (siginfo.si_signo,
siginfo.si_pid,
siginfo.si_uid))
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
