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- /*
- * 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.
- */
- /*
- * HISTORY
- * $Log: mach_msg_server.c,v $
- * 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/boolean.h>
- #include <mach/kern_return.h>
- #include <mach/port.h>
- #include <mach/message.h>
- #include <mach/mig_errors.h>
-
- #include <stdlib.h> /* For malloc and free. */
-
- /*
- * Routine: mach_msg_server
- * Purpose:
- * A simple generic server function.
- */
-
- mach_msg_return_t
- __mach_msg_server_timeout(demux, max_size, rcv_name, option, timeout)
- boolean_t (*demux)();
- mach_msg_size_t max_size;
- mach_port_t rcv_name;
- mach_msg_option_t option;
- mach_msg_timeout_t timeout;
- {
- register mig_reply_header_t *bufRequest, *bufReply, *bufTemp;
- register mach_msg_return_t mr;
-
- bufRequest = (mig_reply_header_t *) malloc(max_size);
- if (bufRequest == 0)
- return KERN_RESOURCE_SHORTAGE;
- bufReply = (mig_reply_header_t *) malloc(max_size);
- if (bufReply == 0)
- return KERN_RESOURCE_SHORTAGE;
-
- for (;;) {
- get_request:
- mr = __mach_msg(&bufRequest->Head, MACH_RCV_MSG|option,
- 0, max_size, rcv_name,
- timeout, MACH_PORT_NULL);
- while (mr == MACH_MSG_SUCCESS) {
- /* we have a request message */
-
- (void) (*demux)(&bufRequest->Head, &bufReply->Head);
-
- if (bufReply->RetCode != KERN_SUCCESS) {
- if (bufReply->RetCode == MIG_NO_REPLY)
- goto get_request;
-
- /* don't destroy the reply port right,
- so we can send an error message */
- bufRequest->Head.msgh_remote_port = MACH_PORT_NULL;
- __mach_msg_destroy(&bufRequest->Head);
- }
-
- if (bufReply->Head.msgh_remote_port == MACH_PORT_NULL) {
- /* no reply port, so destroy the reply */
- if (bufReply->Head.msgh_bits & MACH_MSGH_BITS_COMPLEX)
- __mach_msg_destroy(&bufReply->Head);
-
- goto get_request;
- }
-
- /* send reply and get next request */
-
- bufTemp = bufRequest;
- bufRequest = bufReply;
- bufReply = bufTemp;
-
- mr = __mach_msg(&bufRequest->Head,
- MACH_SEND_MSG|MACH_RCV_MSG|option,
- bufRequest->Head.msgh_size, max_size, rcv_name,
- timeout, MACH_PORT_NULL);
- }
-
- /* a message error occurred */
-
- if (mr != MACH_SEND_INVALID_DEST)
- break;
-
- /* the reply can't be delivered, so destroy it */
- __mach_msg_destroy(&bufRequest->Head);
- }
-
- free((char *) bufRequest);
- free((char *) bufReply);
- return mr;
- }
-
-
- mach_msg_return_t
- __mach_msg_server (demux, max_size, rcv_name)
- boolean_t (*demux) ();
- 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);
- }
-