How to safely catch and forward a OS signal (SIGINT, SIGHUP, etc)

[stiffstream]

How to safely catch and forward a OS signal (SIGINT, SIGHUP, etc)

[eao197]

Hi!

You can find an approach that we used earlier in our arataga project:

Signal handling loop: https://github.com/Stiffstream/arataga/blob/b6e1720dd2df055949847425f12bb1af56edbe83/arataga/main.cpp#L602-L639
The core part of the main function: https://github.com/Stiffstream/arataga/blob/b6e1720dd2df055949847425f12bb1af56edbe83/arataga/main.cpp#L866-L877

Some of approaches you mentioned should also work and don't seem to be complex in implementation, for example:

• Periodically poll signals through a signalfd.
• Wait on a signalfd from another thread and send a message though a mchain.

But this case:

• Make a custom timer thread implementation that replaces the condition variable by an eventfd or self-pipe, so that it can simultaneously wait on other FDs or receive data from a signal handler.

seems to be overkill in implementation complexity.

[jcarrano]

Thanks for the quick response. I had failed to notice that one can use a custom loop through a wrapped env!