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freebsd-dev/lib/libc/stdlib/exit.c

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BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
/*-
General further adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
2017-11-20 19:49:47 +00:00
* SPDX-License-Identifier: BSD-3-Clause
*
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
Renumber clauses to reduce diffs to other versions NetBSD, OpenBSD, and Android's Bionic number the clauses 1 through 3, so follow suit to make comparison easier.
2013-05-28 20:57:40 +00:00
* 3. Neither the name of the University nor the names of its contributors
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)exit.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
Fix the style of the SCM ID's. I believe have made all of libc .c's as consistent as possible.
2002-03-22 21:53:29 +00:00
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
#include "namespace.h"
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
#include <stdlib.h>
#include <unistd.h>
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
#include "un-namespace.h"
Move the declaration of __cleanup to libc_private.h as it is used in both stdio/ and stdlib/. Don't define __cleanup twice.
2005-09-12 13:46:32 +00:00
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
#include "atexit.h"
Move the declaration of __cleanup to libc_private.h as it is used in both stdio/ and stdlib/. Don't define __cleanup twice.
2005-09-12 13:46:32 +00:00
#include "libc_private.h"
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
Move the declaration of __cleanup to libc_private.h as it is used in both stdio/ and stdlib/. Don't define __cleanup twice.
2005-09-12 13:46:32 +00:00
void (*__cleanup)(void);
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
Add a global variable called __isthreaded that can be tested throughout libc to determine if locking is required. This is needed in libc for use with kernel threads, but until a thread is created, we don't really want to bother locking things. The variable was added here because the crt code calls exit(main()) so all programs will get the variable.
1998-04-11 07:02:58 +00:00
/*
* This variable is zero until a process has created a thread.
* It is used to avoid calling locking functions in libc when they
* are not required. By default, libc is intended to be(come)
* thread-safe, but without a (significant) penalty to non-threaded
* processes.
*/
int __isthreaded = 0;
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
/*
* Exit, flushing stdio buffers if necessary.
*/
void
Use ANSI C prototypes. Eliminates -Wold-style-definition warnings.
2015-09-20 20:24:28 +00:00
exit(int status)
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
{
Reference an external variable in threaded programs so that the autoinitialiser gets linked in and therefore called before main().
1998-04-29 09:08:43 +00:00
/* Ensure that the auto-initialization routine is linked in: */
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
extern int _thread_autoinit_dummy_decl;
Reference an external variable in threaded programs so that the autoinitialiser gets linked in and therefore called before main().
1998-04-29 09:08:43 +00:00
_thread_autoinit_dummy_decl = 1;
Add __cxa_thread_atexit(3) API implementation. This is the backing feature to implement C++11 thread storage duration specified by the thread_local keyword. A destructor for given thread-local object is registered to be executed at the thread termination time using __cxa_thread_atexit(). Libc calls the __cxa_thread_calls_dtors() during exit(3), before finalizers and atexit functions, and libthr calls the function at the thread termination time, after the stack unwinding and thread-specific key destruction. There are several uncertainties in the API which lacks a formal specification. Among them: - is it allowed to register destructors during destructing; we allow, but limiting the nesting level. If too many iterations detected, a diagnostic is issued to stderr and thread forcibly terminates for now. - how to handle destructors which belong to an unloading dso; for now, we ignore destructor calls for such entries, and issue a diagnostic. Linux does prevent dso unload until all threads with destructors from the dso terminated. It is supposed that the diagnostics allow to detect real-world applications relying on the above details and possibly adjust our implementation. Right now the choices were to provide the slim API (but that rarely stands the practice test). Tests are added to check generic functionality and to specify some of the above implementation choices. Submitted by: Mahdi Mokhtari <mokhi64_gmail.com> Reviewed by: theraven Discussed with: dim (detection of -std=c++11 supoort for tests) Sponsored by: The FreeBSD Foundation (my involvement) MFC after: 2 weeks Differential revisions: https://reviews.freebsd.org/D7224, https://reviews.freebsd.org/D7427
2016-08-06 13:32:40 +00:00
/*
* We're dealing with cleaning up thread_local destructors in the case of
* the process termination through main() exit.
* Other cases are handled elsewhere.
*/
__cxa_thread_call_dtors();
Implement __cxa_atexit/__cxa_finalize as specified by the cross-vendor ó++ ABI document at http://www.codesourcery.com/cxx-abi/abi.html#dso-dtor The ABI was initially defined for ia64, but GCC3 and Intel compilers have adopted it on other platforms. This is the patch from PR bin/59552 with a number of changes by me. PR: bin/59552 Submitted by: Bradley T Hughes (bhughes at trolltech dot com)
2003-12-19 17:11:21 +00:00
__cxa_finalize(NULL);
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
if (__cleanup)
(*__cleanup)();
_exit(status);
}
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