2002-02-18 Roland McGrath <roland@frob.com>
authorroland <roland>
Tue, 19 Feb 2002 00:22:12 +0000 (00:22 +0000)
committerroland <roland>
Tue, 19 Feb 2002 00:22:12 +0000 (00:22 +0000)
* mach/msg.c [MACH_MSG_OVERWRITE]
(__mach_msg_trap, __mach_msg_overwrite): New functions.
* mach/Versions (libc: GLIBC_2.0): Add mach_msg_overwrite and __ name.

mach/Versions
mach/msg.c

index 4a7017f..18ec511 100644 (file)
@@ -24,7 +24,7 @@ libc {
 %endif
 
     # functions used by RPC stubs
-    __mach_msg;
+    __mach_msg; __mach_msg_overwrite;
     __mig_allocate; __mig_deallocate; __mig_dealloc_reply_port;
     __mig_get_reply_port; __mig_put_reply_port;
     __mig_strncpy;
@@ -40,7 +40,8 @@ libc {
     # m*
     mach_error; mach_error_string; mach_error_type;
     mach_host_self;
-    mach_msg; mach_msg_destroy;
+    mach_msg; mach_msg_overwrite;
+    mach_msg_destroy;
     mach_msg_send; mach_msg_receive;
     mach_msg_server; mach_msg_server_timeout;
     mach_open_devstream;
index ece1108..bccad7f 100644 (file)
@@ -1,31 +1,94 @@
-/* 
+/*
  * Mach Operating System
  * Copyright (c) 1991,1990,1989, 1995 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.
  */
 #include <mach/port.h>
 #include <mach/message.h>
 
+#ifdef MACH_MSG_OVERWRITE
+/* In variants with this feature, the actual system call is
+   __mach_msg_overwrite_trap.  */
+mach_msg_return_t
+__mach_msg_trap (mach_msg_header_t *msg,
+                mach_msg_option_t option,
+                mach_msg_size_t send_size,
+                mach_msg_size_t rcv_size,
+                mach_port_t rcv_name,
+                mach_msg_timeout_t timeout,
+                mach_port_t notify)
+{
+  return __mach_msg_overwrite_trap (msg, option, send_size,
+                                   rcv_size, rcv_name, timeout, notify,
+                                   MACH_MSG_NULL, 0);
+}
+weak_alias (__mach_msg_trap, mach_msg_trap)
+
+/* See comments below in __mach_msg.  */
+mach_msg_return_t
+__mach_msg_overwrite (mach_msg_header_t *msg,
+                     mach_msg_option_t option,
+                     mach_msg_size_t send_size,
+                     mach_msg_size_t rcv_size,
+                     mach_port_t rcv_name,
+                     mach_msg_timeout_t timeout,
+                     mach_port_t notify,
+                     mach_msg_header_t *rcv_msg,
+                     mach_msg_size_t rcv_msg_size)
+
+{
+  mach_msg_return_t ret;
+
+  /* Consider the following cases:
+     1. Errors in pseudo-receive (eg, MACH_SEND_INTERRUPTED
+     plus special bits).
+     2. Use of MACH_SEND_INTERRUPT/MACH_RCV_INTERRUPT options.
+     3. RPC calls with interruptions in one/both halves.
+  */
+
+  ret = __mach_msg_overwrite_trap (msg, option, send_size,
+                                  rcv_size, rcv_name, timeout, notify,
+                                  rcv_msg, rcv_msg_size);
+  if (ret == MACH_MSG_SUCCESS)
+    return MACH_MSG_SUCCESS;
+
+  if (!(option & MACH_SEND_INTERRUPT))
+    while (ret == MACH_SEND_INTERRUPTED)
+      ret = __mach_msg_overwrite_trap (msg, option, send_size,
+                                      rcv_size, rcv_name, timeout, notify,
+                                      rcv_msg, rcv_msg_size);
+
+  if (!(option & MACH_RCV_INTERRUPT))
+    while (ret == MACH_RCV_INTERRUPTED)
+      ret = __mach_msg_overwrite_trap (msg, option & ~MACH_SEND_MSG,
+                                      0, rcv_size, rcv_name, timeout, notify,
+                                      rcv_msg, rcv_msg_size);
+
+  return ret;
+}
+weak_alias (__mach_msg_overwrite, mach_msg_overwrite)
+#endif
+
 mach_msg_return_t
 __mach_msg (mach_msg_header_t *msg,
            mach_msg_option_t option,
@@ -36,29 +99,29 @@ __mach_msg (mach_msg_header_t *msg,
            mach_port_t notify)
 {
   mach_msg_return_t ret;
-  
+
   /* Consider the following cases:
      1. Errors in pseudo-receive (eg, MACH_SEND_INTERRUPTED
      plus special bits).
      2. Use of MACH_SEND_INTERRUPT/MACH_RCV_INTERRUPT options.
      3. RPC calls with interruptions in one/both halves.
      */
-  
+
   ret = __mach_msg_trap (msg, option, send_size,
                         rcv_size, rcv_name, timeout, notify);
   if (ret == MACH_MSG_SUCCESS)
     return MACH_MSG_SUCCESS;
-  
+
   if (!(option & MACH_SEND_INTERRUPT))
     while (ret == MACH_SEND_INTERRUPTED)
       ret = __mach_msg_trap (msg, option, send_size,
                             rcv_size, rcv_name, timeout, notify);
-  
+
   if (!(option & MACH_RCV_INTERRUPT))
     while (ret == MACH_RCV_INTERRUPTED)
       ret = __mach_msg_trap (msg, option & ~MACH_SEND_MSG,
                             0, rcv_size, rcv_name, timeout, notify);
-  
+
   return ret;
 }
 weak_alias (__mach_msg, mach_msg)