initial import

1 files changed, 160 insertions, 0 deletions

diff --git a/mach/msg-destroy.c b/mach/msg-destroy.c
new file mode 100644
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--- /dev/null
+++ b/mach/msg-destroy.c
@@ -0,0 +1,160 @@
+/* 
+ * 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  1995/01/23 22:16:52  roland
+ * (mach_msg_destroy): Define as weak alias for __mach_msg_destroy.
+ *
+ * Revision 1.2  1993/08/03  06:13:18  roland
+ * entered into RCS
+ *
+ * Revision 2.4  91/05/14  17:53:15  mrt
+ * 	Correcting copyright
+ * 
+ * Revision 2.3  91/02/14  14:17:43  mrt
+ * 	Added new Mach copyright
+ * 	[91/02/13  12:44:15  mrt]
+ * 
+ * Revision 2.2  90/08/06  17:24:22  rpd
+ * 	Created.
+ * 
+ */
+
+#if 1
+#include <mach.h>
+#else
+/* This is what CMU did, but that fails to declare some used functions.  */
+#include <mach/port.h>
+#include <mach/message.h>
+#include <mach_init.h>
+#endif
+
+static void mach_msg_destroy_port();
+static void mach_msg_destroy_memory();
+
+/*
+ *	Routine:	mach_msg_destroy
+ *	Purpose:
+ *		Deallocates all port rights and out-of-line memory
+ *		found in a received message.
+ */
+
+void
+__mach_msg_destroy(msg)
+    mach_msg_header_t *msg;
+{
+    mach_msg_bits_t mbits = msg->msgh_bits;
+
+    /*
+     *	The msgh_local_port field doesn't hold a port right.
+     *	The receive operation consumes the destination port right.
+     */
+
+    mach_msg_destroy_port(msg->msgh_remote_port, MACH_MSGH_BITS_REMOTE(mbits));
+
+    if (mbits & MACH_MSGH_BITS_COMPLEX) {
+	vm_offset_t saddr;
+	vm_offset_t eaddr;
+
+	saddr = (vm_offset_t) (msg + 1);
+	eaddr = (vm_offset_t) msg + msg->msgh_size;
+
+	while (saddr < eaddr) {
+	    mach_msg_type_long_t *type;
+	    mach_msg_type_name_t name;
+	    mach_msg_type_size_t size;
+	    mach_msg_type_number_t number;
+	    boolean_t is_inline;
+	    vm_size_t length;
+	    vm_offset_t addr;
+
+	    type = (mach_msg_type_long_t *) saddr;
+	    is_inline = type->msgtl_header.msgt_inline;
+	    if (type->msgtl_header.msgt_longform) {
+		    name = type->msgtl_name;
+		    size = type->msgtl_size;
+		    number = type->msgtl_number;
+		    saddr += sizeof(mach_msg_type_long_t);
+	    } else {
+		    name = type->msgtl_header.msgt_name;
+		    size = type->msgtl_header.msgt_size;
+		    number = type->msgtl_header.msgt_number;
+		    saddr += sizeof(mach_msg_type_t);
+	    }
+
+	    /* calculate length of data in bytes, rounding up */
+	    length = ((((number * size) + 7) >> 3) + 3) &~ 3;
+
+	    addr = is_inline ? saddr : * (vm_offset_t *) saddr;
+
+	    if (MACH_MSG_TYPE_PORT_ANY(name)) {
+		mach_port_t *ports = (mach_port_t *) addr;
+		mach_msg_type_number_t i;
+
+		for (i = 0; i < number; i++)
+		    mach_msg_destroy_port(*ports++, name);
+	    }
+
+	    if (is_inline) {
+		/* inline data sizes round up to int boundaries */
+		saddr += length;
+	    } else {
+		mach_msg_destroy_memory(addr, length);
+		saddr += sizeof(vm_offset_t);
+	    }
+	}
+    }
+}
+
+weak_alias (__mach_msg_destroy, mach_msg_destroy)
+
+static void
+mach_msg_destroy_port(port, type)
+    mach_port_t port;
+    mach_msg_type_name_t type;
+{
+    if (MACH_PORT_VALID(port)) switch (type) {
+      case MACH_MSG_TYPE_PORT_SEND:
+      case MACH_MSG_TYPE_PORT_SEND_ONCE:
+	(void) __mach_port_deallocate(__mach_task_self(), port);
+	break;
+
+      case MACH_MSG_TYPE_PORT_RECEIVE:
+	(void) __mach_port_mod_refs(__mach_task_self(), port,
+				    MACH_PORT_RIGHT_RECEIVE, -1);
+	break;
+    }
+}
+
+static void
+mach_msg_destroy_memory(addr, size)
+    vm_offset_t addr;
+    vm_size_t size;
+{
+    if (size > 0)
+	(void) __vm_deallocate(__mach_task_self(), addr, size);
+}