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      1 /*
      2  * Mach Operating System
      3  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
      4  * All Rights Reserved.
      5  *
      6  * Permission to use, copy, modify and distribute this software and its
      7  * documentation is hereby granted, provided that both the copyright
      8  * notice and this permission notice appear in all copies of the
      9  * software, derivative works or modified versions, and any portions
     10  * thereof, and that both notices appear in supporting documentation.
     11  *
     12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     15  *
     16  * Carnegie Mellon requests users of this software to return to
     17  *
     18  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     19  *  School of Computer Science
     20  *  Carnegie Mellon University
     21  *  Pittsburgh PA 15213-3890
     22  *
     23  * any improvements or extensions that they make and grant Carnegie Mellon
     24  * the rights to redistribute these changes.
     25  */
     26 /*
     27  * HISTORY
     28  * $Log:mach_msg.c,v $
     29  * Revision 2.3  92/01/23  15:22:17  rpd
     30  * Fixed to not pass MACH_SEND_INTERRUPT and MACH_RCV_INTERRUPT
     31  * to the kernel.
     32  * [92/01/20            rpd]
     33  *
     34  * Revision 2.2  92/01/15  17:17:13  rpd
     35  * Created from msg.c.
     36  * [92/01/15            rpd]
     37  *
     38  */
     39 
     40 #if defined(VGO_darwin)
     41 
     42 #include "pub_core_basics.h"
     43 #include "pub_core_mach.h"
     44 
     45 #include <mach/port.h>
     46 #include <mach/message.h>
     47 
     48 #define LIBMACH_OPTIONS (MACH_SEND_INTERRUPT|MACH_RCV_INTERRUPT)
     49 
     50 extern mach_msg_return_t
     51 mach_msg_trap(mach_msg_header_t *msg,
     52               mach_msg_option_t option,
     53               mach_msg_size_t send_size,
     54               mach_msg_size_t rcv_size,
     55               mach_port_t rcv_name,
     56               mach_msg_timeout_t timeout,
     57               mach_port_t notify);
     58 
     59 mach_msg_return_t
     60 mach_msg(msg, option, send_size, rcv_size, rcv_name, timeout, notify)
     61     mach_msg_header_t *msg;
     62     mach_msg_option_t option;
     63     mach_msg_size_t send_size;
     64     mach_msg_size_t rcv_size;
     65     mach_port_t rcv_name;
     66     mach_msg_timeout_t timeout;
     67     mach_port_t notify;
     68 {
     69     mach_msg_return_t mr;
     70 
     71     /*
     72      * Consider the following cases:
     73      *1) Errors in pseudo-receive (eg, MACH_SEND_INTERRUPTED
     74      *plus special bits).
     75      *2) Use of MACH_SEND_INTERRUPT/MACH_RCV_INTERRUPT options.
     76      *3) RPC calls with interruptions in one/both halves.
     77      *
     78      * We refrain from passing the option bits that we implement
     79      * to the kernel.  This prevents their presence from inhibiting
     80      * the kernel's fast paths (when it checks the option value).
     81      */
     82 
     83     mr = mach_msg_trap(msg, option &~ LIBMACH_OPTIONS,
     84                        send_size, rcv_size, rcv_name,
     85                        timeout, notify);
     86     if (mr == MACH_MSG_SUCCESS)
     87         return MACH_MSG_SUCCESS;
     88 
     89     if ((option & MACH_SEND_INTERRUPT) == 0)
     90         while (mr == MACH_SEND_INTERRUPTED)
     91             mr = mach_msg_trap(msg,
     92                                option &~ LIBMACH_OPTIONS,
     93                                send_size, rcv_size, rcv_name,
     94                                timeout, notify);
     95 
     96     if ((option & MACH_RCV_INTERRUPT) == 0)
     97         while (mr == MACH_RCV_INTERRUPTED)
     98             mr = mach_msg_trap(msg,
     99                                option &~ (LIBMACH_OPTIONS|MACH_SEND_MSG),
    100                                0, rcv_size, rcv_name,
    101                                timeout, notify);
    102 
    103     return mr;
    104 }
    105 
    106 #endif // defined(VGO_darwin)
    107 
    108 /*--------------------------------------------------------------------*/
    109 /*--- end                                                          ---*/
    110 /*--------------------------------------------------------------------*/
    111