src/lib/libc/sys/__error.c, branch release/13.1.0

General further adoption of SPDX licensing ID tags.

2017-11-20T19:49:47Z

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.

Add missing include to eliminate -Wmissing-prototypes warnings

2015-09-20T03:49:08Z

Avoid calling internal libc function through PLT or accessing data

2015-01-05T01:06:54Z

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

Fix known issues which blow up the process after dlopen("libthr.so")

2015-01-03T18:38:46Z

(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

Fix many "function declaration isn't a prototype" warnings in libc.

2009-12-05T19:31:38Z

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/.

Remove 3rd clause, renumber, ok per email

2007-01-12T07:31:30Z

Fix the style of the SCM ID's.

2002-03-22T21:53:29Z

I believe have made all of libc .c's as consistent as possible.

To be consistent, use the __weak_reference macro from

2001-04-10T04:11:50Z

instead of #pragma weak to create weak definitions. This macro is improperly named, though, since a weak definition is not the same thing as a weak reference. Suggested by: bde

Remove _THREAD_SAFE and make libc thread-safe by default by

2001-01-24T13:01:12Z

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. 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 from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch

Function to return a pointer to the non-threaded errno. This is declared

1998-03-09T07:09:55Z

with a weak symbol so that it won't be linked when linking against libc_r or libpthread.