EXIT
Section: System Calls (2)
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BSD mandoc
BSD 4
NAME
_exit
- terminate the calling process
SYNOPSIS
Fd #include <unistd.h>
Ft void
Fn _exit int status
DESCRIPTION
The
Fn _exit
function
terminates a process with the following consequences:
-
All of the descriptors open 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
wait
call
or catches the
SIGCHLD
signal,
it is notified of the calling process's termination and
the
status
is set as defined by
wait(2).
-
The parent process-ID of all of the calling process's existing child
processes are set to 1; the initialization process
(see the DEFINITIONS section of
intro(2))
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
``orphaned process group''
in
intro(2)),
and if any member of the orphaned group is stopped,
the
SIGHUP
signal and the
SIGCONT
signal are sent to all members of the newly-orphaned process group.
-
If the process is a controlling process (see
intro(2)),
the
SIGHUP
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
exit(3),
which flushes buffers, closes streams, unlinks temporary files, etc.,
before
calling
Fn _exit .
RETURN VALUE
Fn _exit
can never return.
SEE ALSO
fork(2),
sigaction(2),
wait(2),
exit(3)
STANDARDS
The
_exit
function is defined by
St -p1003.1-88 .
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- SEE ALSO
-
- STANDARDS
-
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Time: 16:29:00 GMT, April 18, 2022