initial import

1 files changed, 194 insertions, 0 deletions

diff --git a/mach/msgserver.c b/mach/msgserver.c
new file mode 100644
index 0000000000..e0dc29b754
--- /dev/null
+++ b/mach/msgserver.c
@@ -0,0 +1,194 @@
+/* Copyright (C) 1993, 1994, 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+/* 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.
+ */
+/*
+ * HISTORY
+ * $Log$
+ * Revision 1.3  1995/01/21 15:00:57  roland
+ * Converted to use weak aliases with macros from libc-symbols.h.
+ *
+ * Revision 1.2  1994/10/10  07:20:14  roland
+ * Increase default MAX_SIZE to two pages.
+ *
+ * Revision 1.1  1993/12/06  23:25:25  roland
+ * entered into RCS
+ *
+ * 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.  */
+
+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)
+{
+  register mig_reply_header_t *request, *reply;
+  register mach_msg_return_t mr;
+
+  if (max_size == 0)
+    {
+      option |= MACH_RCV_LARGE;
+      max_size = 2 * __vm_page_size; /* Generic.  Good? XXX */
+    }
+
+  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);
+
+	  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:
+	  /* The request message is larger than MAX_SIZE, and has not
+	     been dequued.  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);
+
+	case MACH_SEND_INVALID_DEST:
+	  /* The reply can't be delivered, so destroy it.  This error
+	     indicates only that the requestor 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 (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);
+}
+weak_alias (__mach_msg_server, mach_msg_server)