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-.\" This manpage is Copyright (C) 1992 Drew Eckhardt;
-.\" and Copyright (C) 1993 Michael Haardt, Ian Jackson.
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Modified Wed Jul 21 23:02:38 1993 by Rik Faith <faith@cs.unc.edu>
-.\" Modified 2001-11-17, aeb
-.\"
-.TH _exit 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-_exit, _Exit \- terminate the calling process
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "[[noreturn]] void _exit(int " status );
-.P
-.B #include <stdlib.h>
-.P
-.BI "[[noreturn]] void _Exit(int " status );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR _Exit ():
-.nf
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-.fi
-.SH DESCRIPTION
-.BR _exit ()
-terminates the calling process "immediately".
-Any open file descriptors belonging to the process are closed.
-Any children of the process are inherited by
-.BR init (1)
-(or by the nearest "subreaper" process as defined through the use of the
-.BR prctl (2)
-.B PR_SET_CHILD_SUBREAPER
-operation).
-The process's parent is sent a
-.B SIGCHLD
-signal.
-.P
-The value
-.I "status & 0xFF"
-is returned to the parent process as the process's exit status, and
-can be collected by the parent using one of the
-.BR wait (2)
-family of calls.
-.P
-The function
-.BR _Exit ()
-is equivalent to
-.BR _exit ().
-.SH RETURN VALUE
-These functions do not return.
-.SH STANDARDS
-.TP
-.BR _exit ()
-POSIX.1-2008.
-.TP
-.BR _Exit ()
-C11, POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, SVr4, 4.3BSD.
-.P
-.BR _Exit ()
-was introduced by C99.
-.SH NOTES
-For a discussion on the effects of an exit, the transmission of
-exit status, zombie processes, signals sent, and so on, see
-.BR exit (3).
-.P
-The function
-.BR _exit ()
-is like
-.BR exit (3),
-but does not call any
-functions registered with
-.BR atexit (3)
-or
-.BR on_exit (3).
-Open
-.BR stdio (3)
-streams are not flushed.
-On the other hand,
-.BR _exit ()
-does close open file descriptors, and this may cause an unknown delay,
-waiting for pending output to finish.
-If the delay is undesired,
-it may be useful to call functions like
-.BR tcflush (3)
-before calling
-.BR _exit ().
-Whether any pending I/O is canceled, and which pending I/O may be
-canceled upon
-.BR _exit (),
-is implementation-dependent.
-.SS C library/kernel differences
-The text above in DESCRIPTION describes the traditional effect of
-.BR _exit (),
-which is to terminate a process,
-and these are the semantics specified by POSIX.1 and implemented
-by the C library wrapper function.
-On modern systems, this means termination of all threads in the process.
-.P
-By contrast with the C library wrapper function, the raw Linux
-.BR _exit ()
-system call terminates only the calling thread, and actions such as
-reparenting child processes or sending
-.B SIGCHLD
-to the parent process are performed only if this is
-the last thread in the thread group.
-.\" _exit() is used by pthread_exit() to terminate the calling thread
-.P
-Up to glibc 2.3, the
-.BR _exit ()
-wrapper function invoked the kernel system call of the same name.
-Since glibc 2.3, the wrapper function invokes
-.BR exit_group (2),
-in order to terminate all of the threads in a process.
-.SH SEE ALSO
-.BR execve (2),
-.BR exit_group (2),
-.BR fork (2),
-.BR kill (2),
-.BR wait (2),
-.BR wait4 (2),
-.BR waitpid (2),
-.BR atexit (3),
-.BR exit (3),
-.BR on_exit (3),
-.BR termios (3)