_exit, _Exit — terminate the calling process
terminates the calling process "immediately". Any open file
descriptors belonging to the process are closed; any children
of the process are inherited by process 1,
init, and the process's
parent is sent a
is returned to the parent process as the process's exit
status, and can be collected using one of the wait(2) family of
For a discussion on the effects of an exit, the transmission of exit status, zombie processes, signals sent, and so on, see exit(3).
_exit() is like
exit(3), but does not call
any functions registered with atexit(3) or on_exit(3). Open stdio(3) streams are not
flushed. On the other hand,
_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 tcflush(3) before calling
_exit(). Whether any pending
I/O is canceled, and which pending I/O may be canceled upon
In glibc up to version 2.3, the
_exit() wrapper function invoked the
kernel system call of the same name. Since glibc 2.3, the
wrapper function invokes exit_group(2), in order
to terminate all of the threads in a process.
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and the latest version of this page, can be found at
This manpage is Copyright (C) 1992 Drew Eckhardt;
and Copyright (C) 1993 Michael Haardt, Ian Jackson.
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.
Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date. The author(s) assume no
responsibility for errors or omissions, or for damages resulting from
the use of the information contained herein. The author(s) may not
have taken the same level of care in the production of this manual,
which is licensed free of charge, as they might when working
Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.
Modified Wed Jul 21 23:02:38 1993 by Rik Faith <faithcs.unc.edu>
Modified 2001-11-17, aeb