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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
in glibc up to version 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.
.pp
the raw
.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
.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)
.sh colophon
this page is part of release 5.13 of the linux
.i man-pages
project.
a description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%https://www.kernel.org/doc/man\-pages/.
.so man3/div.3
.so man3/rpc.3
.\" copyright (c) 1995, thomas k. dyas <[email protected]>
.\"
.\" %%%license_start(verbatim)
.\" 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.\" manual page may be incorrect or out-of-date.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
.\" professionally.
.\"
.\" formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\" %%%license_end
.\"
.\" created 1995-08-09 thomas k. dyas <[email protected]>
.\" modified 1997-01-31 by eric s. raymond <[email protected]>
.\" modified 2001-03-22 by aeb
.\" modified 2003-08-04 by aeb
.\"
.th ustat 2 2021-03-22 "linux" "linux programmer's manual"
.sh name
ustat \- get filesystem statistics
.sh synopsis