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/* Demux messages sent on the signal port.
Copyright (C) 1991-2020 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
<https://www.gnu.org/licenses/>. */
#include <hurd.h>
#include <hurd/signal.h>
#include <stddef.h>
struct demux
{
struct demux *next;
boolean_t (*demux) (mach_msg_header_t *inp,
mach_msg_header_t *outp);
};
struct demux *_hurd_msgport_demuxers = NULL;
extern boolean_t __msg_server (mach_msg_header_t *inp,
mach_msg_header_t *outp);
static boolean_t
msgport_server (mach_msg_header_t *inp,
mach_msg_header_t *outp)
{
extern boolean_t _S_msg_server (mach_msg_header_t *inp,
mach_msg_header_t *outp);
extern boolean_t _S_exc_server (mach_msg_header_t *inp,
mach_msg_header_t *outp);
struct demux *d;
for (d = _hurd_msgport_demuxers; d != NULL; d = d->next)
if ((*d->demux) (inp, outp))
return 1;
return (_S_exc_server (inp, outp)
|| _S_msg_server (inp, outp));
}
/* This is the code that the signal thread runs. */
void *
_hurd_msgport_receive (void *arg)
{
/* Get our own sigstate cached so we never again have to take a lock to
fetch it. There is much code in hurdsig.c that operates with some
sigstate lock held, which will deadlock with _hurd_thread_sigstate.
Furthermore, in the pthread case this is the convenient spot
to initialize _hurd_msgport_thread (see hurdsig.c:_hurdsig_init). */
_hurd_msgport_thread = _hurd_self_sigstate ()->thread;
while (1)
(void) __mach_msg_server (msgport_server, __vm_page_size, _hurd_msgport);
}
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