threads/lu_utils.c

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Port and memory management for doing lookups to the lookup server
  25  * Copyright (C) 1989 by NeXT, Inc.
  26  */
  27 /*
  28  * HISTORY
  29  * 27-Mar-90  Gregg Kellogg (gk) at NeXT
  30  *      Changed to use bootstrap port instead of service port.
  31  *
  32  */
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <sys/types.h>
  36 #include <unistd.h>
  37 #include <mach/mach.h>
  38 #include <mach/error.h>
  39 #include <servers/bootstrap.h>
  40
  41 mach_port_t _lu_port = MACH_PORT_NULL;
  42 static name_t LOOKUP_NAME = "lookup daemon v2";
  43
  44 mach_port_t _lookupd_port(mach_port_t port) {
  45         kern_return_t ret;
  46
  47         if (port != MACH_PORT_NULL) {
  48                 ret = bootstrap_register(bootstrap_port, LOOKUP_NAME, port);
  49                 if (ret != BOOTSTRAP_SUCCESS) {
  50                         mach_error("bootstrap_register() failed", ret);
  51                         abort();
  52                 }
  53                 return port;
  54         } else if ((_lu_port == MACH_PORT_NULL) && (getpid() > 1)) {
  55                 ret = bootstrap_look_up(bootstrap_port, LOOKUP_NAME, &_lu_port);
  56                 if (ret != BOOTSTRAP_SUCCESS && ret != BOOTSTRAP_UNKNOWN_SERVICE) {
  57                         mach_error("bootstrap_look_up() failed", ret);
  58                         _lu_port = MACH_PORT_NULL;
  59                 }
  60         }
  61         return _lu_port;
  62 }
  63
  64 /* called as child starts up.  mach ports aren't inherited: trash cache */
  65 void
  66 _lu_fork_child()
  67 {
  68         _lu_port = MACH_PORT_NULL;
  69 }
  70
  71 void
  72 _lu_setport(mach_port_t desired)
  73 {
  74         if (_lu_port != MACH_PORT_NULL) {
  75                 mach_port_deallocate(mach_task_self(), _lu_port);
  76         }
  77         _lu_port = desired;
  78 }
  79
  80 int
  81 _lu_running(void)
  82 {
  83         return ((_lu_port != MACH_PORT_NULL) ||
  84                 (_lookupd_port(MACH_PORT_NULL) != MACH_PORT_NULL));
  85 }