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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/mach/hurd/sigaltstack.c
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initial import
Diffstat (limited to 'sysdeps/mach/hurd/sigaltstack.c')
-rw-r--r--sysdeps/mach/hurd/sigaltstack.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/sigaltstack.c b/sysdeps/mach/hurd/sigaltstack.c
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+++ b/sysdeps/mach/hurd/sigaltstack.c
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+/* Copyright (C) 1992, 1993, 1994, 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 <ansidecl.h>
+#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
+DEFUN(sigaltstack, (ss, oss),
+ CONST struct sigaltstack *argss AND struct sigaltstack *oss)
+{
+ struct hurd_sigstate *s;
+ struct sigaltstack ss, old;
+
+ /* Fault before taking any locks. */
+ if (argss != NULL)
+ ss = *argss;
+ if (oss != NULL)
+ *(volatile struct sigaltstack *) oss = *oss;
+
+ s = _hurd_self_sigstate ();
+ __spin_lock (&s->lock);
+
+ if (argss != NULL &&
+ (ss.ss_flags & SA_DISABLE) && (s->sigaltstack.ss_flags & SA_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;
+}