| 1 | /* Demux messages sent on the signal port. |
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| 2 | Copyright (C) 1991-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <hurd.h> |
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| 20 | #include <hurd/signal.h> |
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| 21 | #include <stddef.h> |
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| 22 | |
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| 23 | struct demux |
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| 24 | { |
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| 25 | struct demux *next; |
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| 26 | boolean_t (*demux) (mach_msg_header_t *inp, |
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| 27 | mach_msg_header_t *outp); |
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| 28 | }; |
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| 29 | |
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| 30 | struct demux *_hurd_msgport_demuxers = NULL; |
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| 31 | |
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| 32 | extern boolean_t __msg_server (mach_msg_header_t *inp, |
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| 33 | mach_msg_header_t *outp); |
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| 34 | |
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| 35 | static boolean_t |
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| 36 | msgport_server (mach_msg_header_t *inp, |
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| 37 | mach_msg_header_t *outp) |
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| 38 | { |
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| 39 | extern boolean_t _S_msg_server (mach_msg_header_t *inp, |
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| 40 | mach_msg_header_t *outp); |
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| 41 | extern boolean_t _S_exc_server (mach_msg_header_t *inp, |
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| 42 | mach_msg_header_t *outp); |
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| 43 | struct demux *d; |
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| 44 | |
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| 45 | for (d = _hurd_msgport_demuxers; d != NULL; d = d->next) |
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| 46 | if ((*d->demux) (inp, outp)) |
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| 47 | return 1; |
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| 48 | |
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| 49 | return (_S_exc_server (inp, outp) |
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| 50 | || _S_msg_server (inp, outp)); |
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| 51 | } |
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| 52 | |
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| 53 | /* This is the code that the signal thread runs. */ |
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| 54 | void * |
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| 55 | _hurd_msgport_receive (void *arg) |
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| 56 | { |
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| 57 | /* Get our own sigstate cached so we never again have to take a lock to |
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| 58 | fetch it. There is much code in hurdsig.c that operates with some |
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| 59 | sigstate lock held, which will deadlock with _hurd_thread_sigstate. |
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| 60 | |
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| 61 | Furthermore, in the pthread case this is the convenient spot |
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| 62 | to initialize _hurd_msgport_thread (see hurdsig.c:_hurdsig_init). */ |
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| 63 | |
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| 64 | _hurd_msgport_thread = _hurd_self_sigstate ()->thread; |
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| 65 | |
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| 66 | while (1) |
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| 67 | (void) __mach_msg_server (msgport_server, __vm_page_size, _hurd_msgport); |
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| 68 | } |
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| 69 | |
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