_EXIT(2)_EXIT(2)NAME_exit - terminate a process
SYNOPSIS
#include <stdlib.h>
int _exit(int status);
DESCRIPTION
The _exit function terminates a process with the following
consequences:
All file descriptors and directory streams open in the calling process
are closed. This may entail delays, for example, a process waiting for
output to drain may not be killed, as it is already dying.
The parent process of the calling process receives a SIGCHLD signal,
and when it executes a wait(2) or waitpid(2P) call (which it may
already be suspended on), the exit status of the calling process is
returned to it.
Children of the calling process aren't directly terminated. Child
processes may receive a SIGHUP signal as described below for process
groups. Otherwise, child processes are assigned the initialization
process (whose process ID is 1) as their parent.
If the calling process is a controlling process, the SIGHUP signal is
sent to each process in the foreground process group of the controlling
terminal, and the calling process' controlling terminal is
disassociated from the session, allowing it to be acquired by a new
controlling process.
For BSD applications, all stopped children of the exiting process are
restarted with a hangup signal (SIGHUP). For POSIX applications, if
the exit of the calling process causes a process group to become
orphaned, and if any member of the newly orphaned process group is
stopped, then a SIGHUP signal followed by a SIGCONT signal is sent to
each process in the newly orphaned process group.
Most C programs call the library routine exit(3), which performs
cleanup actions in the standard I/O library before calling _exit.
RETURN VALUE
This call never returns.
SEE ALSOfork(2), sigvec(2), wait(2), exit(3)
August 1, 1992 _EXIT(2)
