mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
133 lines
3.1 KiB
C
133 lines
3.1 KiB
C
/* Copyright (C) 1996-2013 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>
|
|
#include <hurd/msg.h>
|
|
#include <hurd/sigpreempt.h>
|
|
#include <assert.h>
|
|
|
|
/* Select any of pending signals from SET or wait for any to arrive. */
|
|
int
|
|
__sigwait (const sigset_t *set, int *sig)
|
|
{
|
|
struct hurd_sigstate *ss;
|
|
sigset_t mask, ready;
|
|
int signo = 0;
|
|
struct hurd_signal_preemptor preemptor;
|
|
jmp_buf buf;
|
|
mach_port_t wait;
|
|
mach_msg_header_t msg;
|
|
|
|
sighandler_t
|
|
preempt_fun (struct hurd_signal_preemptor *pe,
|
|
struct hurd_sigstate *ss,
|
|
int *sigp,
|
|
struct hurd_signal_detail *detail)
|
|
{
|
|
if (signo)
|
|
/* We've already been run; don't interfere. */
|
|
return SIG_ERR;
|
|
|
|
signo = *sigp;
|
|
|
|
/* Make sure this is all kosher */
|
|
assert (__sigismember (&mask, signo));
|
|
|
|
/* Make sure this signal is unblocked */
|
|
__sigdelset (&ss->blocked, signo);
|
|
|
|
return pe->handler;
|
|
}
|
|
|
|
void
|
|
handler (int sig)
|
|
{
|
|
assert (sig == signo);
|
|
longjmp (buf, 1);
|
|
}
|
|
|
|
wait = __mach_reply_port ();
|
|
|
|
if (set != NULL)
|
|
/* Crash before locking */
|
|
mask = *set;
|
|
else
|
|
__sigemptyset (&mask);
|
|
|
|
ss = _hurd_self_sigstate ();
|
|
__spin_lock (&ss->lock);
|
|
|
|
/* See if one of these signals is currently pending. */
|
|
__sigandset (&ready, &ss->pending, &mask);
|
|
if (! __sigisemptyset (&ready))
|
|
{
|
|
for (signo = 1; signo < NSIG; signo++)
|
|
if (__sigismember (&ready, signo))
|
|
{
|
|
__sigdelset (&ready, signo);
|
|
goto all_done;
|
|
}
|
|
/* Huh? Where'd it go? */
|
|
abort ();
|
|
}
|
|
|
|
/* Wait for one of them to show up. */
|
|
|
|
if (!setjmp (buf))
|
|
{
|
|
/* Make the preemptor */
|
|
preemptor.signals = mask;
|
|
preemptor.first = 0;
|
|
preemptor.last = -1;
|
|
preemptor.preemptor = preempt_fun;
|
|
preemptor.handler = handler;
|
|
|
|
/* Install this preemptor */
|
|
preemptor.next = ss->preemptors;
|
|
ss->preemptors = &preemptor;
|
|
|
|
__spin_unlock (&ss->lock);
|
|
|
|
/* Wait. */
|
|
__mach_msg (&msg, MACH_RCV_MSG, 0, sizeof (msg), wait,
|
|
MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
|
|
abort ();
|
|
}
|
|
else
|
|
{
|
|
assert (signo);
|
|
|
|
__spin_lock (&ss->lock);
|
|
|
|
/* Delete our preemptor. */
|
|
assert (ss->preemptors == &preemptor);
|
|
ss->preemptors = preemptor.next;
|
|
}
|
|
|
|
|
|
all_done:
|
|
spin_unlock (&ss->lock);
|
|
|
|
__mach_port_destroy (__mach_task_self (), wait);
|
|
*sig = signo;
|
|
return 0;
|
|
}
|
|
|
|
weak_alias (__sigwait, sigwait)
|