libc.so can't be unloaded, so move the hidden atexit() and pthread_atfork()

stubs for the executable from crtbegin.o into libc, which lets them be
excluded from static links that don't use them.
For this, drop the normal crt{begin,end}S.o from libc.so: the .init and .fini
sections for libc aren't called at the right times anyway, so it's good that
they're unused.  libc.so just needs __guard_local and the .note.openbsd.ident
section, so add them to stack_protector.c for now (this will be improved)

"good time" deraadt@

2 files changed, 27 insertions, 2 deletions

diff --git a/lib/libc/hidden/pthread.h b/lib/libc/hidden/pthread.h
new file mode 100644
index 00000000000..c390753a1c2
--- /dev/null
+++ b/lib/libc/hidden/pthread.h
@@ -0,0 +1,25 @@
+/*	$OpenBSD: pthread.h,v 1.1 2015/11/10 04:14:03 guenther Exp $	*/
+/*
+ * Copyright (c) 2015 Philip Guenther <guenther@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _LIBC_PTHREAD_H_
+#define	_LIBC_PTHREAD_H_
+
+#include_next <pthread.h>
+
+PROTO_DEPRECATED(pthread_atfork);
+
+#endif /* !_LIBC_PTHREAD_H_ */
diff --git a/lib/libc/hidden/stdlib.h b/lib/libc/hidden/stdlib.h
index 36e46072c50..0370fb8f5fe 100644
--- a/lib/libc/hidden/stdlib.h
+++ b/lib/libc/hidden/stdlib.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: stdlib.h,v 1.5 2015/10/25 18:01:24 guenther Exp $	*/
+/*	$OpenBSD: stdlib.h,v 1.6 2015/11/10 04:14:03 guenther Exp $	*/
 /*	$NetBSD: stdlib.h,v 1.25 1995/12/27 21:19:08 jtc Exp $	*/
 
 /*-
@@ -54,7 +54,7 @@ PROTO_NORMAL(abs);
 PROTO_NORMAL(arc4random);
 PROTO_NORMAL(arc4random_buf);
 PROTO_NORMAL(arc4random_uniform);
-/*PROTO_NORMAL(atexit);			actually in csu */
+PROTO_NORMAL(atexit);
 PROTO_STD_DEPRECATED(atof);
 PROTO_NORMAL(atoi);
 PROTO_STD_DEPRECATED(atol);