在关于孤立进程组的 GNU libc手册中,它提到:
“process groups that continue running even after the session leader
has terminated are marked as orphaned process groups.
When a process group becomes an orphan, its processes are sent a SIGHUP
signal. Ordinarily, this causes the processes to terminate. However,
if a program ignores this signal or establishes a handler for it
(see Signal Handling), it can continue running as in the orphan process
group even after its controlling process terminates; but it still
cannot access …