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63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
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/* Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <hurd.h>
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#include <hurd/signal.h>
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/* Run signals handlers on the stack specified by SS (if not NULL).
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If OSS is not NULL, it is filled in with the old signal stack status. */
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int
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DEFUN(sigaltstack, (ss, oss),
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CONST struct sigaltstack *argss AND struct sigaltstack *oss)
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{
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struct hurd_sigstate *s;
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struct sigaltstack ss, old;
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/* Fault before taking any locks. */
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if (argss != NULL)
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ss = *argss;
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if (oss != NULL)
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*(volatile struct sigaltstack *) oss = *oss;
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s = _hurd_self_sigstate ();
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__spin_lock (&s->lock);
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if (argss != NULL &&
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(ss.ss_flags & SA_DISABLE) && (s->sigaltstack.ss_flags & SA_ONSTACK))
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{
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/* Can't disable a stack that is in use. */
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__spin_unlock (&s->lock);
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errno = EINVAL;
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return -1;
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}
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old = s->sigaltstack;
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if (argss != NULL)
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s->sigaltstack = ss;
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__spin_unlock (&s->lock);
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if (oss != NULL)
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*oss = old;
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return 0;
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}
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