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).

MFC r276630:
Remove interposing, fix malloc, reinstall signal handlers wrappers on
libthr load.

MFC r276681:
Avoid calling internal libc function through PLT or accessing data
though GOT.

MFC r277032:
Reduce the size of the interposing table and amount of
cancellation-handling code in the libthr.

MFC note:
r276646 ("do not erronously export 'openat' symbol from rtld") is not
applicable to stable/10 yet, since PATHFDS support was not merged.

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/libthr/sys/thr_error.c b/lib/libthr/sys/thr_error.c
index 45295c5..852588a 100644
--- a/lib/libthr/sys/thr_error.c
+++ b/lib/libthr/sys/thr_error.c
@@ -42,8 +42,9 @@
 #undef errno
 extern	int	errno;
 
+__weak_reference(__error_threaded, __error);
 int *
-__error(void)
+__error_threaded(void)
 {
 	struct pthread *curthread;