From 0324daa0055227fdb157b8491d4e5bbe9d9d579a Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Thu, 21 Sep 1995 06:24:21 +0000
Subject: Thu Sep 21 00:03:53 1995  Roland McGrath 
 <roland@churchy.gnu.ai.mit.edu>

	* sysdeps/stub/sys/sem_buf.h (union semun): New type.

	* sysdeps/mach/hurd/i386/init-first.c (init1) [PIC]: Call
	__libc_global_ctors.
	* sysdeps/i386/init-first.c: Rewritten.
	* sysdeps/unix/sysv/linux/i386/init-first.S: File removed.
	* sysdeps/unix/sysv/linux/i386/init-first.c: New file.

	* sysdeps/unix/sysv/linux/i386/fpu_control.h: Fix name in decl of
	___fpu_control.

	* Makerules (build-shlib): New canned sequence, broken out of
	lib%.so rule.  Link in $^ instead of just $<.
	(lib%.so: lib%_pic.a): Use it.
	(libc.so): New target; use $(build-shlib) for cmds, but also depend
	on soinit.so first and sofini.so last.

	* elf/soinit.c: New file.
	* elf/sofini.c: New file.
	* elf/Makefile (distribute): Add soinit.c and sofini.c.
	(extra-objs): Add soinit.so and sofini.so.

	* sysvipc/sys/shm.h (shmat): Fix return type to char *.
	* sysdeps/stub/sys/ipc_buf.h (key_t): Type removed.

	* misc/syslog.c (vsyslog): Rewritten using open_memstream to
	dynamically allocate buffers.

	* Makerules (install-lib-nosubdir): Make this, rather than
	install-no-libc.a, depend on the installed shared libraries.
---
 elf/Makefile |  5 +++--
 elf/sofini.c |  9 +++++++++
 elf/soinit.c | 38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 50 insertions(+), 2 deletions(-)
 create mode 100644 elf/sofini.c
 create mode 100644 elf/soinit.c

(limited to 'elf')

diff --git a/elf/Makefile b/elf/Makefile
index b0923b2b6d..0065d2ba47 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -31,12 +31,13 @@ LDFLAGS-dl.so	:= -e 0 # work around ld bug
 
 rtld-routines	:= rtld $(addprefix dl-,load lookup object reloc	\
 				        runtime sysdep error init fini)
-distribute	= $(rtld-routines:=.c) dynamic-link.h do-rel.h
+distribute	= $(rtld-routines:=.c) dynamic-link.h do-rel.h \
+		  soinit.c sofini.c
 
 include ../Makeconfig
 
 ifeq (yes,$(build-shared))
-extra-objs	= $(rtld-routines:=.so)
+extra-objs	= $(rtld-routines:=.so) soinit.so sofini.so
 install-lib	= ld.so
 endif
 
diff --git a/elf/sofini.c b/elf/sofini.c
new file mode 100644
index 0000000000..e44041b5ec
--- /dev/null
+++ b/elf/sofini.c
@@ -0,0 +1,9 @@
+/* Finalizer module for ELF shared C library.  This provides terminating
+   null pointer words in the `.ctors' and `.dtors' sections.  */
+
+static void (*const __CTOR_END__[1]) (void)
+     __attribute__ ((unused, section (".ctors")))
+     = { 0 };
+static void (*const __DTOR_END__[1]) (void)
+     __attribute__ ((unused, section (".dtors")))
+     = { 0 };
diff --git a/elf/soinit.c b/elf/soinit.c
new file mode 100644
index 0000000000..0310b74b93
--- /dev/null
+++ b/elf/soinit.c
@@ -0,0 +1,38 @@
+/* Initializer module for building the ELF shared C library.  This file and
+   sofini.c do the work normally done by crtbeginS.o and crtendS.o, to wrap
+   the `.ctors' and `.dtors' sections so the lists are terminated, and
+   calling those lists of functions.  */
+
+static void (*const __CTOR_LIST__[1]) (void)
+     __attribute__ ((section (".ctors")))
+     = { (void (*) (void)) -1 };
+static void (*const __DTOR_LIST__[1]) (void)
+     __attribute__ ((section (".dtors")))
+     = { (void (*) (void)) -1 };
+
+static inline void
+run_hooks (void (*const list[]) (void))
+{
+  while (*++list)
+    (**list) ();
+}
+
+
+/* This function will be called from _init in init-first.c.  */
+void
+__libc_global_ctors (void)
+{
+  /* Call constructor functions.  */
+  run_hooks (__CTOR_LIST__);
+}
+
+
+/* This function becomes the DT_FINI termination function
+   for the C library.  */
+void _fini (void) __attribute__ ((section (".fini"))); /* Just for kicks.  */
+void
+_fini (void)
+{
+  /* Call destructor functions.  */
+  run_hooks (__DTOR_LIST__);
+}
-- 
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