Mon Mar 27 02:23:15 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>

	* posix/unistd.h [__USE_BSD] (ttyslot): Declare it.

	* posix/unistd.h [__USE_BSD] (L_SET, L_INCR, L_XTND): Define
 	unless L_SET already defined.
	* misc/sys/file.h (L_SET, L_INCR, L_XTND): Don't define if L_SET
 	already defined.

	Incorporated -lutil library from 4.4-Lite.
	* misc/Makefile (extra-libs, libutil-routines): New variables.
	* misc/login.c, misc/login_tty.c, misc/logout.c, misc/logwtmp.c,
	sysdeps/generic/pty.c: New files for -lutil incorporated from 4.4-Lite.

	Support simple, light-weight unwind-protect mechanism for longjmp.
	* setjmp/longjmp.c: Call _longjmp_unwind first thing.
	* sysdeps/mach/hurd/jmp-unwind.c: New file.
	* sysdeps/stub/jmp-unwind.c: New file.
	* sysdeps/i386/jmp_buf.h (_JMPBUF_UNWINDS): New macro.
	* sysdeps/mips/jmp_buf.h (_JMPBUF_UNWINDS): New macro.
	* setjmp/Makefile (routines): Add jmp-unwind.
	* hurd/hurd/userlink.h (struct hurd_userlink): Move `next' and
 	`prevp' members into new substructure `resource'; add another such
 	substructure `thread' and members `cleanup' (function ptr) and
 	`cleanup_data' (generic ptr).
	(_hurd_userlink_link, _hurd_userlink_unlink): Insert/remove LINK
	into the `_hurd_self_sigstate ()->active_resources' list via the
	`thread' substructure.
	* hurd/hurd/port.h (_hurd_port_cleanup): Declare it.
	(_hurd_port_locked_get): Set LINK->cleanup to _hurd_port_cleanup and
	LINK->cleanup_data' to the port extracted.
	* hurd/hurd/signal.h (struct hurd_sigstate): New member
	`active_resources'.
	* hurd/port-cleanup.c: New file.
	* hurd/Makefile (routines): Add port-cleanup.

	* malloc/malloc.c: Include errno.h.

Sat Mar 25 18:24:21 1995  Roland McGrath  <roland@churchy.gnu.ai.mit.edu>

	* locale/loadlocale.c (_nl_load_locale): Avoid */ inside comment.

1 files changed, 62 insertions, 0 deletions

diff --git a/sysdeps/mach/hurd/jmp-unwind.c b/sysdeps/mach/hurd/jmp-unwind.c
new file mode 100644
index 0000000000..f7540f0dde
--- /dev/null
+++ b/sysdeps/mach/hurd/jmp-unwind.c
@@ -0,0 +1,62 @@
+/* _longjmp_unwind -- Clean up stack frames unwound by longjmp.  Hurd version.
+Copyright (C) 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <setjmp.h>
+#include <hurd/signal.h>
+#include <hurd/userlink.h>
+#include <assert.h>
+
+/* This function is called by `longjmp' (with its arguments) to restore
+   active resources to a sane state before the frames code using them are
+   jumped out of.  */
+
+void
+_longjmp_unwind (jmp_buf env, int val)
+{
+  struct hurd_sigstate *ss = _hurd_self_sigstate ();
+  struct hurd_userlink *link;
+
+  /* All access to SS->active_resources must take place inside a critical
+     section where signal handlers cannot run.  */
+  __spin_lock (&ss->lock);
+  assert (! ss->critical_section);
+  ss->critical_section = 1;
+  __spin_unlock (&ss->lock);
+
+#ifndef _JMPBUF_UNWINDS
+ #error "sysdeps/MACHINE/jmp_buf.h fails to define _JMPBUF_UNWINDS"
+#endif
+
+  /* Iterate over the current thread's list of active resources.
+     Process the head portion of the list whose links reside
+     in stack frames being unwound by this jump.  */
+
+  for (link = ss->active_resources;
+       link && _JMPBUF_UNWINDS (env[0].__jmpbuf, link);
+       link = link->thread.next)
+    /* Remove this link from the resource's users list,
+       since the frame using the resource is being unwound.
+       This call returns nonzero if that was the last user.  */
+    if (_hurd_userlink_unlink (link))
+      /* One of the frames being unwound by the longjmp was the last user
+	 of its resource.  Call the cleanup function to deallocate it.  */
+      (*link->cleanup) (link->cleanup_data, env, val);
+
+  _hurd_critical_section_unlock (ss);
+}