mach/msg.c

   1 /*
   2  * Mach Operating System
   3  * Copyright (c) 1991,1990,1989, 1995 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@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 #include <mach/port.h>
  27 #include <mach/message.h>
  28
  29 mach_msg_return_t
  30 __mach_msg (mach_msg_header_t *msg,
  31             mach_msg_option_t option,
  32             mach_msg_size_t send_size,
  33             mach_msg_size_t rcv_size,
  34             mach_port_t rcv_name,
  35             mach_msg_timeout_t timeout,
  36             mach_port_t notify)
  37 {
  38   mach_msg_return_t ret;
  39
  40   /* Consider the following cases:
  41      1. Errors in pseudo-receive (eg, MACH_SEND_INTERRUPTED
  42      plus special bits).
  43      2. Use of MACH_SEND_INTERRUPT/MACH_RCV_INTERRUPT options.
  44      3. RPC calls with interruptions in one/both halves.
  45      */
  46
  47   ret = __mach_msg_trap (msg, option, send_size,
  48                          rcv_size, rcv_name, timeout, notify);
  49   if (ret == MACH_MSG_SUCCESS)
  50     return MACH_MSG_SUCCESS;
  51
  52   if (!(option & MACH_SEND_INTERRUPT))
  53     while (ret == MACH_SEND_INTERRUPTED)
  54       ret = __mach_msg_trap (msg, option, send_size,
  55                              rcv_size, rcv_name, timeout, notify);
  56
  57   if (!(option & MACH_RCV_INTERRUPT))
  58     while (ret == MACH_RCV_INTERRUPTED)
  59       ret = __mach_msg_trap (msg, option & ~MACH_SEND_MSG,
  60                              0, rcv_size, rcv_name, timeout, notify);
  61
  62   return ret;
  63 }
  64 weak_alias (__mach_msg, mach_msg)
  65
  66 mach_msg_return_t
  67 __mach_msg_send (mach_msg_header_t *msg)
  68 {
  69   return __mach_msg (msg, MACH_SEND_MSG,
  70                      msg->msgh_size, 0, MACH_PORT_NULL,
  71                      MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
  72 }
  73 weak_alias (__mach_msg_send, mach_msg_send)
  74
  75 mach_msg_return_t
  76 __mach_msg_receive (mach_msg_header_t *msg)
  77 {
  78   return __mach_msg (msg, MACH_RCV_MSG,
  79                      0, msg->msgh_size, msg->msgh_local_port,
  80                      MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
  81 }
  82 weak_alias (__mach_msg_receive, mach_msg_receive)