text: /* 
   * Mach Operating System
   * Copyright (c) 1991,1990,1989 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:	mach_msg.c,v $
   * Revision 2.3  92/01/23  15:22:17  rpd
   * 	Fixed to not pass MACH_SEND_INTERRUPT and MACH_RCV_INTERRUPT
   * 	to the kernel.
   * 	[92/01/20            rpd]
   * 
   * Revision 2.2  92/01/15  17:17:13  rpd
   * 	Created from msg.c.
   * 	[92/01/15            rpd]
   * 
   */
  
  #include <mach/port.h>
  #include <mach/message.h>
  
  #define LIBMACH_OPTIONS	(MACH_SEND_INTERRUPT|MACH_RCV_INTERRUPT)
  
  mach_msg_return_t
  mach_msg(msg, option, send_size, rcv_size, rcv_name, timeout, notify)
  	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_return_t mr;
  
  	/*
  	 * 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.
  	 *
  	 * We refrain from passing the option bits that we implement
  	 * to the kernel.  This prevents their presence from inhibiting
  	 * the kernel's fast paths (when it checks the option value).
  	 */
  
  	mr = mach_msg_trap(msg, option &~ LIBMACH_OPTIONS,
  			   send_size, rcv_size, rcv_name,
  			   timeout, notify);
  	if (mr == MACH_MSG_SUCCESS)
  		return MACH_MSG_SUCCESS;
  
  	if ((option & MACH_SEND_INTERRUPT) == 0)
  		while (mr == MACH_SEND_INTERRUPTED)
  			mr = mach_msg_trap(msg,
  				option &~ LIBMACH_OPTIONS,
  				send_size, rcv_size, rcv_name,
  				timeout, notify);
  
  	if ((option & MACH_RCV_INTERRUPT) == 0)
  		while (mr == MACH_RCV_INTERRUPTED)
  			mr = mach_msg_trap(msg,
  				option &~ (LIBMACH_OPTIONS|MACH_SEND_MSG),
  				0, rcv_size, rcv_name,
  				timeout, notify);
  
  	return mr;
  }
  