function terminates a process with the following consequences:
All open file descriptors in the calling process are closed.
This may entail delays; for example, waiting for output to drain.
A process in this state may not be killed, as it is already dying.
If the parent process of the calling process has an outstanding
call or catches the
signal, it is notified of the calling process's termination and
is set as defined by
(Note that typically only the lower 8 bits of
are passed on to the parent, thus negative values have less meaning.)
The parent process ID of all of the calling process's existing child
processes are set to 1; the initialization process (see the
inherits each of these processes.
If the termination of the process causes any process group
to become orphaned (usually because the parents of all members
of the group have now exited; see
and if any member of the orphaned group is stopped, the
signals are sent to all members of the newly orphaned process group.
If the process is a controlling process (see
signal is sent to the foreground process group of the controlling terminal,
and all current access to the controlling terminal is revoked.
Most C programs call the library routine
which flushes buffers, closes streams, unlinks temporary files, etc.,
and then calls