Supportforkillingthewholechildprocessgroup

tini only kills the immediate child process. This means that if you
do, for example,

and ctrl-C it, nothing happens: SIGINT is sent to the 'sh' process,
but that shell won't react to it while it is waiting for the 'sleep'
to finish.

This change adds a -g option to put the child process of tini into a
new process group, and sends signals to that group, so that every
process in the group gets a signal. This corresponds more closely to
what happens when you do ctrl-C etc. in a terminal: The signal is sent
to the foreground process group.

So if you try the example above with a container image that passes -g
to tini, the SIGINT will be received by the 'sleep', and the container
promptly exits.

该提问来源于开源项目：krallin/tini