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.\" Hey Emacs! This file is -*- nroff -*- source.
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.\"
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.\" This manpage is Copyright (C) 1992 Drew Eckhardt;
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.\" 1993 Michael Haardt, Ian Jackson.
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" Modified Wed Jul 21 23:02:38 1993 by Rik Faith <faith@cs.unc.edu>
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.\" Modified 2001-11-17, aeb
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.\"
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_exit.2, brk.2, capget.2, chdir.2, chmod.2, chown.2, chroot.2, getdtablesize.2, gethostname.2, getpagesize.2, getsid.2, killpg.2, mknod.2, mknodat.2, poll.2, posix_fadvise.2, pread.2, readlink.2, setpgid.2, setreuid.2, sigaltstack.2, stat.2, symlink.2, sync.2, truncate.2, vfork.2, wait.2, wait4.2, a64l.3, abs.3, acos.3, acosh.3, asin.3, asinh.3, atan.3, atan2.3, atoi.3, cbrt.3, ceil.3, copysign.3, cosh.3, dirfd.3, div.3, ecvt.3, erf.3, erfc.3, exp.3, exp2.3, fabs.3, fdim.3, ffs.3, floor.3, fma.3, fmax.3, fmin.3, fmod.3, fpclassify.3, frexp.3, ftw.3, fwide.3, gcvt.3, getcwd.3, getdate.3, getgrent.3, gethostid.3, getpass.3, getpwent.3, getsubopt.3, getw.3, hypot.3, ilogb.3, index.3, isalpha.3, isgreater.3, iswblank.3, j0.3, ldexp.3, lockf.3, log.3, log10.3, log1p.3, logb.3, lrint.3, lround.3, mkstemp.3, mktemp.3, modf.3, mq_receive.3, mq_send.3, nan.3, nextafter.3, posix_fallocate.3, posix_memalign.3, printf.3, qecvt.3, random.3, realpath.3, remainder.3, remquo.3, rint.3, round.3, scalb.3, scalbln.3, scanf.3, siginterrupt.3, signbit.3, sigset.3, sinh.3, sqrt.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strfry.3, strpbrk.3, strsep.3, strspn.3, strstr.3, strtod.3, strtok.3, strtol.3, strtoul.3, strxfrm.3, tanh.3, tgamma.3, trunc.3, ttyslot.3, ualarm.3, usleep.3, wprintf.3, armscii-8.7, cp1251.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-3.7, iso_8859-5.7, iso_8859-6.7, iso_8859-8.7, koi8-u.7: tstamp
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-09-19 17:19:13 +00:00
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.TH _EXIT 2 2010-09-20 "Linux" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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2007-12-27 16:06:35 +00:00
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_exit, _Exit \- terminate the calling process
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.SH SYNOPSIS
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.B #include <unistd.h>
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.sp
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.BI "void _exit(int " status );
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.sp
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.B #include <stdlib.h>
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.sp
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.BI "void _Exit(int " status );
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2007-07-08 12:11:40 +00:00
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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2010-09-18 16:32:42 +00:00
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.ad l
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.BR _Exit ():
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2010-09-18 16:32:42 +00:00
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.RS 4
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2010-09-18 16:37:36 +00:00
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_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
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_POSIX_C_SOURCE\ >=\ 200112L;
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2010-09-18 16:32:42 +00:00
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.br
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or
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2007-07-08 12:11:40 +00:00
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.I cc\ -std=c99
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2012-03-12 15:22:05 +00:00
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.RE
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2010-09-18 16:32:42 +00:00
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.ad
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2004-11-03 13:51:07 +00:00
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.SH DESCRIPTION
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The function
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2005-10-19 07:07:02 +00:00
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.BR _exit ()
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terminates the calling process "immediately".
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Any open file descriptors
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belonging to the process are closed; any children of the process are
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inherited by process 1,
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2005-06-14 11:20:57 +00:00
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.IR init ,
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and the process's parent is sent a
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2004-11-03 13:51:07 +00:00
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.B SIGCHLD
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signal.
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.LP
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The value
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.I status
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is returned to the parent process as the process's exit status, and
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can be collected using one of the
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2007-05-11 23:07:02 +00:00
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.BR wait (2)
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2004-11-03 13:51:07 +00:00
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family of calls.
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.LP
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The function
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2005-10-19 07:07:02 +00:00
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.BR _Exit ()
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2004-11-03 13:51:07 +00:00
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is equivalent to
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2005-10-19 07:07:02 +00:00
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.BR _exit ().
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2004-11-03 13:51:07 +00:00
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.SH "RETURN VALUE"
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These functions do not return.
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.SH "CONFORMING TO"
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2006-08-03 13:57:17 +00:00
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SVr4, POSIX.1-2001, 4.3BSD.
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2007-05-12 09:06:04 +00:00
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The function
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.BR _Exit ()
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was introduced by C99.
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2004-11-03 13:51:07 +00:00
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.SH NOTES
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For a discussion on the effects of an exit, the transmission of
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2012-05-06 19:35:37 +00:00
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exit status, zombie processes, signals sent, and so on, see
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2004-11-03 13:51:07 +00:00
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.BR exit (3).
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.LP
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The function
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2005-10-19 07:07:02 +00:00
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.BR _exit ()
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2007-05-12 09:06:04 +00:00
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is like
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.BR exit (3),
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but does not call any
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2005-06-14 11:20:57 +00:00
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functions registered with
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2007-05-11 23:07:02 +00:00
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.BR atexit (3)
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2007-04-12 22:42:49 +00:00
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or
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2007-05-11 23:07:02 +00:00
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.BR on_exit (3).
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2005-06-14 11:20:57 +00:00
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Whether it flushes
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2004-11-03 13:51:07 +00:00
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standard I/O buffers and removes temporary files created with
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.BR tmpfile (3)
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2007-12-26 11:17:23 +00:00
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is implementation-dependent.
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2004-11-03 13:51:07 +00:00
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On the other hand,
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2005-10-19 07:07:02 +00:00
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.BR _exit ()
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2004-11-03 13:51:07 +00:00
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does close open file descriptors, and this may cause an unknown delay,
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2007-04-12 22:42:49 +00:00
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waiting for pending output to finish.
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If the delay is undesired,
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2007-06-21 22:55:04 +00:00
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it may be useful to call functions like
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2007-05-11 23:07:02 +00:00
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.BR tcflush (3)
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2007-05-12 09:06:04 +00:00
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before calling
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.BR _exit ().
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2007-06-08 09:56:56 +00:00
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Whether any pending I/O is canceled, and which pending I/O may be
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canceled upon
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2007-05-12 09:06:04 +00:00
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.BR _exit (),
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is implementation-dependent.
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2008-11-28 17:04:51 +00:00
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In glibc up to version 2.3, the
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.BR _exit ()
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wrapper function invoked the kernel system call of the same name.
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Since glibc 2.3, the wrapper function invokes
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.BR exit_group (2),
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in order to terminate all of the threads in a process.
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2004-11-03 13:51:07 +00:00
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.SH "SEE ALSO"
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.BR execve (2),
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2006-05-29 04:56:29 +00:00
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.BR exit_group (2),
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2004-11-03 13:51:07 +00:00
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.BR fork (2),
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.BR kill (2),
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.BR wait (2),
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.BR wait4 (2),
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.BR waitpid (2),
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2005-06-14 11:20:57 +00:00
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.BR atexit (3),
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2004-11-03 13:51:07 +00:00
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.BR exit (3),
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2005-06-14 11:20:57 +00:00
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.BR on_exit (3),
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2004-11-03 13:51:07 +00:00
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.BR termios (3)
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