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82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
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/* Copyright (C) 1991, 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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#include <hurd/msg.h>
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/* Change the set of blocked signals to SET,
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wait until a signal arrives, and restore the set of blocked signals. */
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int
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DEFUN(sigsuspend, (set), CONST sigset_t *set)
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{
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struct hurd_sigstate *ss;
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sigset_t newmask, oldmask, pending;
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mach_port_t wait;
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mach_msg_header_t msg;
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if (set != NULL)
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/* Crash before locking. */
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newmask = *set;
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/* Get a fresh port we will wait on. */
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wait = __mach_reply_port ();
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ss = _hurd_self_sigstate ();
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__spin_lock (&ss->lock);
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oldmask = ss->blocked;
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if (set != NULL)
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/* Change to the new blocked signal mask. */
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ss->blocked = newmask & ~_SIG_CANT_MASK;
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/* Notice if any pending signals just became unblocked. */
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pending = ss->pending & ~ss->blocked;
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/* Tell the signal thread to message us when a signal arrives. */
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ss->suspended = wait;
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__spin_unlock (&ss->lock);
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if (pending)
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/* Tell the signal thread to check for pending signals. */
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__msg_sig_post (_hurd_msgport, 0, __mach_task_self ());
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/* Wait for the signal thread's message. */
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__mach_msg (&msg, MACH_RCV_MSG, 0, sizeof (msg), wait,
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MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
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__mach_port_destroy (__mach_task_self (), wait);
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__spin_lock (&ss->lock);
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ss->blocked = oldmask; /* Restore the old mask. */
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pending = ss->pending & ~ss->blocked; /* Again check for pending signals. */
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__spin_unlock (&ss->lock);
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if (pending)
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/* Tell the signal thread to check for pending signals. */
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__msg_sig_post (_hurd_msgport, 0, __mach_task_self ());
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/* We've been interrupted! And a good thing, too.
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Otherwise we'd never return.
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That's right; this function always returns an error. */
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errno = EINTR;
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return -1;
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}
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