Support rthreads on OpenBSD 5.2 and later.

OpenBSD 5.2 and later have a proper threads implementation based on
kernel threads.  Debugging support is provided through additional
ptrace(2) requests, so this diff extends the generic code in
inf-ptrace.c with OpenBSD-specific code to discover additional threads.

gdb/ChangeLog:

        * obsd-nat.h: New file.
        * obsd-nat.c: New file.
        * Makefile.in (HFILES_NO_SRCDIR): Add obsd-nat.h.
        (ALLDEPFILES): Add obsd-nat.c.

1 files changed, 25 insertions, 0 deletions

diff --git a/gdb/obsd-nat.h b/gdb/obsd-nat.h
new file mode 100644
index 00000000000..ad021fc4a88
--- /dev/null
+++ b/gdb/obsd-nat.h
@@ -0,0 +1,25 @@
+/* Native-dependent code for OpenBSD.
+
+   Copyright (C) 2014 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef OBSD_NAT_H
+#define OBSD_NAT_H
+
+extern void obsd_add_target (struct target_ops *);
+
+#endif /* obsd-nat.h */