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glibc/mach/msgserver.c
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/* Copyright (C) 1993-2016 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/>. */ | |
/* Based on CMU's mach_msg_server.c revision 2.4 of 91/05/14, and thus | |
under the following copyright. Rewritten by Roland McGrath (FSF) | |
93/12/06 to use stack space instead of malloc, and to handle | |
large messages with MACH_RCV_LARGE. */ | |
/* | |
* Mach Operating System | |
* Copyright (c) 1991,1990 Carnegie Mellon University | |
* All Rights Reserved. | |
* | |
* Permission to use, copy, modify and distribute this software and its | |
* documentation is hereby granted, provided that both the copyright | |
* notice and this permission notice appear in all copies of the | |
* software, derivative works or modified versions, and any portions | |
* thereof, and that both notices appear in supporting documentation. | |
* | |
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" | |
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR | |
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. | |
* | |
* Carnegie Mellon requests users of this software to return to | |
* | |
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU | |
* School of Computer Science | |
* Carnegie Mellon University | |
* Pittsburgh PA 15213-3890 | |
* | |
* any improvements or extensions that they make and grant Carnegie Mellon | |
* the rights to redistribute these changes. | |
*/ | |
/* | |
* (pre-GNU) HISTORY | |
* | |
* Revision 2.4 91/05/14 17:53:22 mrt | |
* Correcting copyright | |
* | |
* Revision 2.3 91/02/14 14:17:47 mrt | |
* Added new Mach copyright | |
* [91/02/13 12:44:20 mrt] | |
* | |
* Revision 2.2 90/08/06 17:23:58 rpd | |
* Created. | |
* | |
*/ | |
#include <mach.h> | |
#include <mach/mig_errors.h> | |
#include <stdlib.h> /* For malloc and free. */ | |
#include <assert.h> | |
#ifdef NDR_CHAR_ASCII /* OSF Mach flavors have different names. */ | |
# define mig_reply_header_t mig_reply_error_t | |
#endif | |
mach_msg_return_t | |
__mach_msg_server_timeout (boolean_t (*demux) (mach_msg_header_t *request, | |
mach_msg_header_t *reply), | |
mach_msg_size_t max_size, | |
mach_port_t rcv_name, | |
mach_msg_option_t option, | |
mach_msg_timeout_t timeout) | |
{ | |
mig_reply_header_t *request, *reply; | |
mach_msg_return_t mr; | |
if (max_size == 0) | |
{ | |
#ifdef MACH_RCV_LARGE | |
option |= MACH_RCV_LARGE; | |
max_size = 2 * __vm_page_size; /* Generic. Good? XXX */ | |
#else | |
max_size = 4 * __vm_page_size; /* XXX */ | |
#endif | |
} | |
request = __alloca (max_size); | |
reply = __alloca (max_size); | |
while (1) | |
{ | |
get_request: | |
mr = __mach_msg (&request->Head, MACH_RCV_MSG|option, | |
0, max_size, rcv_name, | |
timeout, MACH_PORT_NULL); | |
while (mr == MACH_MSG_SUCCESS) | |
{ | |
/* We have a request message. | |
Pass it to DEMUX for processing. */ | |
(void) (*demux) (&request->Head, &reply->Head); | |
assert (reply->Head.msgh_size <= max_size); | |
switch (reply->RetCode) | |
{ | |
case KERN_SUCCESS: | |
/* Hunky dory. */ | |
break; | |
case MIG_NO_REPLY: | |
/* The server function wanted no reply sent. | |
Loop for another request. */ | |
goto get_request; | |
default: | |
/* Some error; destroy the request message to release any | |
port rights or VM it holds. Don't destroy the reply port | |
right, so we can send an error message. */ | |
request->Head.msgh_remote_port = MACH_PORT_NULL; | |
__mach_msg_destroy (&request->Head); | |
break; | |
} | |
if (reply->Head.msgh_remote_port == MACH_PORT_NULL) | |
{ | |
/* No reply port, so destroy the reply. */ | |
if (reply->Head.msgh_bits & MACH_MSGH_BITS_COMPLEX) | |
__mach_msg_destroy (&reply->Head); | |
goto get_request; | |
} | |
/* Send the reply and the get next request. */ | |
{ | |
/* Swap the request and reply buffers. mach_msg will read the | |
reply message from the buffer we pass and write the new | |
request message to the same buffer. */ | |
void *tmp = request; | |
request = reply; | |
reply = tmp; | |
} | |
mr = __mach_msg (&request->Head, | |
MACH_SEND_MSG|MACH_RCV_MSG|option, | |
request->Head.msgh_size, max_size, rcv_name, | |
timeout, MACH_PORT_NULL); | |
} | |
/* A message error occurred. */ | |
switch (mr) | |
{ | |
case MACH_RCV_TOO_LARGE: | |
#ifdef MACH_RCV_LARGE | |
/* The request message is larger than MAX_SIZE, and has not | |
been dequeued. The message header has the actual size of | |
the message. We recurse here in hopes that the compiler | |
will optimize the tail-call and allocate some more stack | |
space instead of way too much. */ | |
return __mach_msg_server_timeout (demux, request->Head.msgh_size, | |
rcv_name, option, timeout); | |
#else | |
/* XXX the kernel has destroyed the msg */ | |
break; | |
#endif | |
case MACH_SEND_INVALID_DEST: | |
/* The reply can't be delivered, so destroy it. This error | |
indicates only that the requester went away, so we | |
continue and get the next request. */ | |
__mach_msg_destroy (&request->Head); | |
break; | |
default: | |
/* Some other form of lossage; return to caller. */ | |
return mr; | |
} | |
} | |
} | |
weak_alias (__mach_msg_server_timeout, mach_msg_server_timeout) | |
mach_msg_return_t | |
__mach_msg_server (boolean_t (*demux) (mach_msg_header_t *in, | |
mach_msg_header_t *out), | |
mach_msg_size_t max_size, | |
mach_port_t rcv_name) | |
{ | |
return __mach_msg_server_timeout (demux, max_size, rcv_name, | |
MACH_MSG_OPTION_NONE, | |
MACH_MSG_TIMEOUT_NONE); | |
} | |
weak_alias (__mach_msg_server, mach_msg_server) |