osfmk/kern/ipc_sync.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  *
  28  */
  29
  30 #include <kern/sync_sema.h>
  31 #include <kern/sync_lock.h>
  32 #include <kern/ipc_kobject.h>
  33 #include <kern/ipc_sync.h>
  34 #include <ipc/port.h>
  35 #include <ipc/ipc_space.h>
  36 #include <ipc/ipc_port.h>
  37 #include <mach/semaphore.h>
  38 #include <mach/lock_set_server.h>
  39 #include <mach/mach_port_server.h>
  40 #include <mach/port.h>
  41
  42
  43 kern_return_t
  44 port_name_to_semaphore(
  45         mach_port_name_t        name,
  46         semaphore_t             *semaphorep)
  47 {
  48         semaphore_t semaphore;
  49         ipc_port_t kern_port;
  50         kern_return_t kr;
  51
  52         if (!MACH_PORT_VALID(name)) {
  53                 *semaphorep = SEMAPHORE_NULL;
  54                 return KERN_INVALID_NAME;
  55         }
  56
  57         kr = ipc_object_translate(current_space(), name, MACH_PORT_RIGHT_SEND,
  58                                   (ipc_object_t *) &kern_port);
  59         if (kr != KERN_SUCCESS) {
  60                 *semaphorep = SEMAPHORE_NULL;
  61                 return kr;
  62         }
  63         /* have the port locked */
  64         assert(IP_VALID(kern_port));
  65
  66         if (!ip_active(kern_port) || (ip_kotype(kern_port) != IKOT_SEMAPHORE)) {
  67                 ip_unlock(kern_port);
  68                 *semaphorep = SEMAPHORE_NULL;
  69                 return KERN_INVALID_ARGUMENT;
  70         }
  71
  72         semaphore = (semaphore_t) kern_port->ip_kobject;
  73         assert(semaphore != SEMAPHORE_NULL);
  74         semaphore_reference(semaphore);
  75         ip_unlock(kern_port);
  76
  77         *semaphorep = semaphore;
  78         return KERN_SUCCESS;
  79 }
  80
  81 semaphore_t
  82 convert_port_to_semaphore (ipc_port_t port)
  83 {
  84         semaphore_t semaphore = SEMAPHORE_NULL;
  85
  86         if (IP_VALID (port)) {
  87                 ip_lock(port);
  88                 if (ip_active(port) && (ip_kotype(port) == IKOT_SEMAPHORE)) {
  89                         semaphore = (semaphore_t) port->ip_kobject;
  90                         semaphore_reference(semaphore);
  91                 }
  92                 ip_unlock(port);
  93         }
  94
  95         return (semaphore);
  96 }
  97
  98
  99 ipc_port_t
 100 convert_semaphore_to_port (semaphore_t semaphore)
 101 {
 102         ipc_port_t port;
 103
 104         if (semaphore != SEMAPHORE_NULL)
 105                 port = ipc_port_make_send(semaphore->port);
 106         else
 107                 port = IP_NULL;
 108
 109         return (port);
 110 }
 111
 112 lock_set_t
 113 convert_port_to_lock_set (ipc_port_t port)
 114 {
 115         lock_set_t lock_set = LOCK_SET_NULL;
 116
 117         if (IP_VALID (port)) {
 118                 ip_lock(port);
 119                 if (ip_active(port) && (ip_kotype(port) == IKOT_LOCK_SET)) {
 120                         lock_set = (lock_set_t) port->ip_kobject;
 121                         lock_set_reference(lock_set);
 122                 }
 123                 ip_unlock(port);
 124         }
 125
 126         return (lock_set);
 127 }
 128
 129 ipc_port_t
 130 convert_lock_set_to_port (lock_set_t lock_set)
 131 {
 132         ipc_port_t port;
 133
 134         if (lock_set != LOCK_SET_NULL)
 135                 port = ipc_port_make_send(lock_set->port);
 136         else
 137                 port = IP_NULL;
 138
 139         return (port);
 140 }
 141