Use a Thread Information Block in both single and multi-threaded programs.

This stores errno, the cancelation flags, and related bits for each thread
and is allocated by ld.so or libc.a.  This is an ABI break from 5.9-stable!

Make libpthread dlopen'able by moving the cancelation wrappers into libc
and doing locking and fork/errno handling via callbacks that libpthread
registers when it first initializes.  'errno' *must* be declared via
<errno.h> now!

Clean up libpthread's symbol exports like libc.

On powerpc, offset the TIB/TCB/TLS data from the register per the ELF spec.

Testing by various, particularly sthen@ and patrick@
ok kettenis@

1 files changed, 3 insertions, 6 deletions

diff --git a/lib/libc/sys/pwrite.c b/lib/libc/sys/pwrite.c
index 445b12ab430..2c99f4912a5 100644
--- a/lib/libc/sys/pwrite.c
+++ b/lib/libc/sys/pwrite.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pwrite.c,v 1.10 2015/09/11 13:26:20 guenther Exp $	 */
+/*	$OpenBSD: pwrite.c,v 1.11 2016/05/07 19:05:22 guenther Exp $	 */
 
 /*
  * Copyright (c) 1992, 1993
@@ -31,22 +31,19 @@
 
 #include <sys/syscall.h>
 #include <unistd.h>
-#include "thread_private.h"
 
 ssize_t	__syscall(quad_t, ...);
 PROTO_NORMAL(__syscall);
 
 
-STUB_PROTOTYPE(pwrite);
-
-STUB_ALIAS(pwrite);
+DEF_SYS(pwrite);
 
 /*
  * This function provides 64-bit offset padding that
  * is not supplied by GCC 1.X but is supplied by GCC 2.X.
  */
 ssize_t
-STUB_NAME(pwrite)(int fd, const void *buf, size_t nbyte, off_t offset)
+HIDDEN(pwrite)(int fd, const void *buf, size_t nbyte, off_t offset)
 {
 	return (__syscall(SYS_pwrite, fd, buf, nbyte, 0, offset));
 }