Sends a break signal of the specified type to the specified process group.
can be one of
signaling, respectively, the pressing of CTRL + Break and of CTRL + C. If not
is the PID of a process sharing the same console. If omitted,
it defaults to 0 (the current process), which is also the only meaningful
value that you can pass to this function.
on error, a nonzero value on success.