1 files changed, 60 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/mach/hurd/sigaltstack.c b/REORG.TODO/sysdeps/mach/hurd/sigaltstack.c
new file mode 100644
index 0000000000..4fba69e766
--- /dev/null
+++ b/REORG.TODO/sysdeps/mach/hurd/sigaltstack.c
@@ -0,0 +1,60 @@
+/* Copyright (C) 1992-2017 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <hurd.h>
+#include <hurd/signal.h>
+
+/* Run signals handlers on the stack specified by SS (if not NULL).
+   If OSS is not NULL, it is filled in with the old signal stack status.  */
+int
+__sigaltstack (const stack_t *argss, stack_t *oss)
+{
+  struct hurd_sigstate *s;
+  stack_t ss, old;
+
+  /* Fault before taking any locks.  */
+  if (argss != NULL)
+    ss = *argss;
+  if (oss != NULL)
+    *(volatile stack_t *) oss = *oss;
+
+  s = _hurd_self_sigstate ();
+  __spin_lock (&s->lock);
+
+  if (argss != NULL &&
+      (ss.ss_flags & SS_DISABLE) && (s->sigaltstack.ss_flags & SS_ONSTACK))
+    {
+      /* Can't disable a stack that is in use.  */
+      __spin_unlock (&s->lock);
+      errno = EINVAL;
+      return -1;
+    }
+
+  old = s->sigaltstack;
+
+  if (argss != NULL)
+    s->sigaltstack = ss;
+
+  __spin_unlock (&s->lock);
+
+  if (oss != NULL)
+    *oss = old;
+
+  return 0;
+}
+weak_alias (__sigaltstack, sigaltstack)