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134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
/* Copyright (C) 1996-2018 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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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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#include <hurd/sigpreempt.h>
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#include <assert.h>
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/* Select any of pending signals from SET or wait for any to arrive. */
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int
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__sigwait (const sigset_t *set, int *sig)
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{
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struct hurd_sigstate *ss;
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sigset_t mask, ready;
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int signo = 0;
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struct hurd_signal_preemptor preemptor;
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jmp_buf buf;
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mach_port_t wait;
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mach_msg_header_t msg;
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sighandler_t
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preempt_fun (struct hurd_signal_preemptor *pe,
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struct hurd_sigstate *ss,
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int *sigp,
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struct hurd_signal_detail *detail)
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{
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if (signo)
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/* We've already been run; don't interfere. */
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return SIG_ERR;
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signo = *sigp;
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/* Make sure this is all kosher */
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assert (__sigismember (&mask, signo));
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/* Make sure this signal is unblocked */
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__sigdelset (&ss->blocked, signo);
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return pe->handler;
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}
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void
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handler (int sig)
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{
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assert (sig == signo);
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longjmp (buf, 1);
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}
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wait = __mach_reply_port ();
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if (set != NULL)
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/* Crash before locking */
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mask = *set;
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else
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__sigemptyset (&mask);
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ss = _hurd_self_sigstate ();
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__spin_lock (&ss->lock);
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/* See if one of these signals is currently pending. */
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__sigandset (&ready, &ss->pending, &mask);
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if (! __sigisemptyset (&ready))
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{
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for (signo = 1; signo < NSIG; signo++)
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if (__sigismember (&ready, signo))
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{
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__sigdelset (&ready, signo);
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goto all_done;
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}
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/* Huh? Where'd it go? */
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abort ();
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}
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/* Wait for one of them to show up. */
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if (!setjmp (buf))
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{
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/* Make the preemptor */
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preemptor.signals = mask;
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preemptor.first = 0;
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preemptor.last = -1;
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preemptor.preemptor = preempt_fun;
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preemptor.handler = handler;
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/* Install this preemptor */
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preemptor.next = ss->preemptors;
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ss->preemptors = &preemptor;
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__spin_unlock (&ss->lock);
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/* Wait. */
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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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abort ();
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}
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else
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{
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assert (signo);
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__spin_lock (&ss->lock);
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/* Delete our preemptor. */
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assert (ss->preemptors == &preemptor);
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ss->preemptors = preemptor.next;
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}
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all_done:
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spin_unlock (&ss->lock);
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__mach_port_destroy (__mach_task_self (), wait);
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*sig = signo;
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return 0;
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}
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libc_hidden_def (__sigwait)
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weak_alias (__sigwait, sigwait)
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