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freebsd-src/lib/libsys/__error.c

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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
*
Function to return a pointer to the non-threaded errno. This is declared with a weak symbol so that it won't be linked when linking against libc_r or libpthread.
1998-03-09 07:09:55 +00:00
* Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>.
* 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.
Remove 3rd clause, renumber, ok per email
2007-01-12 07:31:30 +00:00
* 3. Neither the name of the author nor the names of any co-contributors
Function to return a pointer to the non-threaded errno. This is declared with a weak symbol so that it won't be linked when linking against libc_r or libpthread.
1998-03-09 07:09:55 +00:00
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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.
*/
Add missing include to eliminate -Wmissing-prototypes warnings
2015-09-20 03:49:08 +00:00
#include "libc_private.h"
libsys: move errno to libsys Before, the 'errno' itself was defined in libc and was referenced by libsys, causing undesired dependency. Reviewed by: brooks, imp Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D43985
2024-02-20 15:13:09 +00:00
int errno;
Function to return a pointer to the non-threaded errno. This is declared with a weak symbol so that it won't be linked when linking against libc_r or libpthread.
1998-03-09 07:09:55 +00:00
Avoid calling internal libc function through PLT or accessing data though GOT, by staticizing and hiding. Add setter for __error_selector to hide it as well. Suggested and reviewed by: jilles Sponsored by: The FreeBSD Foundation MFC after: 1 week
2015-01-05 01:06:54 +00:00
static int *
Fix many "function declaration isn't a prototype" warnings in libc. I've only fixed code that seems to be written by `us'. There are still many warnings like this present in resolv/, rpc/, stdtime/ and yp/.
2009-12-05 19:31:38 +00:00
__error_unthreaded(void)
Function to return a pointer to the non-threaded errno. This is declared with a weak symbol so that it won't be linked when linking against libc_r or libpthread.
1998-03-09 07:09:55 +00:00
{
Avoid calling internal libc function through PLT or accessing data though GOT, by staticizing and hiding. Add setter for __error_selector to hide it as well. Suggested and reviewed by: jilles Sponsored by: The FreeBSD Foundation MFC after: 1 week
2015-01-05 01:06:54 +00:00
return (&errno);
Function to return a pointer to the non-threaded errno. This is declared with a weak symbol so that it won't be linked when linking against libc_r or libpthread.
1998-03-09 07:09:55 +00:00
}
Fix known issues which blow up the process after dlopen("libthr.so") (or loading a dso linked to libthr.so into process which was not linked against threading library). - Remove libthr interposers of the libc functions, including __error(). Instead, functions calls are indirected through the interposing table, similar to how pthread stubs in libc are already done. Libc by default points either to syscall trampolines or to existing libc implementations. On libthr load, libthr rewrites the pointers to the cancellable implementations already in libthr. The interposition table is separate from pthreads stubs indirection table to not pull pthreads stubs into static binaries. - Postpone the malloc(3) internal mutexes initialization until libthr is loaded. This avoids recursion between calloc(3) and static pthread_mutex_t initialization. - Reinstall signal handlers with wrapper on libthr load. The _rtld_is_dlopened(3) is used to avoid useless calls to sigaction(2) when libthr is statically referenced from the main binary. In the process, fix openat(2), swapcontext(2) and setcontext(2) interposing. The libc symbols were exported at different versions than libthr interposers. Export both libc and libthr versions from libc now, with default set to the higher version from libthr. Remove unused and disconnected swapcontext(3) userspace implementation from libc/gen. No objections from: deischen Tested by: pho, antoine (exp-run) (previous versions) Sponsored by: The FreeBSD Foundation MFC after: 1 week
2015-01-03 18:38:46 +00:00
Avoid calling internal libc function through PLT or accessing data though GOT, by staticizing and hiding. Add setter for __error_selector to hide it as well. Suggested and reviewed by: jilles Sponsored by: The FreeBSD Foundation MFC after: 1 week
2015-01-05 01:06:54 +00:00
static int *(*__error_selector)(void) = __error_unthreaded;
void
__set_error_selector(int *(*arg)(void))
{
__error_selector = arg;
}
Fix known issues which blow up the process after dlopen("libthr.so") (or loading a dso linked to libthr.so into process which was not linked against threading library). - Remove libthr interposers of the libc functions, including __error(). Instead, functions calls are indirected through the interposing table, similar to how pthread stubs in libc are already done. Libc by default points either to syscall trampolines or to existing libc implementations. On libthr load, libthr rewrites the pointers to the cancellable implementations already in libthr. The interposition table is separate from pthreads stubs indirection table to not pull pthreads stubs into static binaries. - Postpone the malloc(3) internal mutexes initialization until libthr is loaded. This avoids recursion between calloc(3) and static pthread_mutex_t initialization. - Reinstall signal handlers with wrapper on libthr load. The _rtld_is_dlopened(3) is used to avoid useless calls to sigaction(2) when libthr is statically referenced from the main binary. In the process, fix openat(2), swapcontext(2) and setcontext(2) interposing. The libc symbols were exported at different versions than libthr interposers. Export both libc and libthr versions from libc now, with default set to the higher version from libthr. Remove unused and disconnected swapcontext(3) userspace implementation from libc/gen. No objections from: deischen Tested by: pho, antoine (exp-run) (previous versions) Sponsored by: The FreeBSD Foundation MFC after: 1 week
2015-01-03 18:38:46 +00:00
int *
__error(void)
{
return (__error_selector());
}
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