osfmk/kern/ipc_sync.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_COPYRIGHT@
  32  *
  33  */
  34
  35 #include <kern/sync_sema.h>
  36 #include <kern/sync_lock.h>
  37 #include <kern/ipc_kobject.h>
  38 #include <kern/ipc_sync.h>
  39 #include <ipc/port.h>
  40 #include <ipc/ipc_space.h>
  41 #include <ipc/ipc_port.h>
  42 #include <mach/semaphore.h>
  43 #include <mach/lock_set_server.h>
  44 #include <mach/mach_port_server.h>
  45 #include <mach/port.h>
  46
  47
  48 kern_return_t
  49 port_name_to_semaphore(
  50         mach_port_name_t        name,
  51         semaphore_t             *semaphorep)
  52 {
  53         semaphore_t semaphore;
  54         ipc_port_t kern_port;
  55         kern_return_t kr;
  56
  57         if (!MACH_PORT_VALID(name)) {
  58                 *semaphorep = SEMAPHORE_NULL;
  59                 return KERN_INVALID_NAME;
  60         }
  61
  62         kr = ipc_object_translate(current_space(), name, MACH_PORT_RIGHT_SEND,
  63                                   (ipc_object_t *) &kern_port);
  64         if (kr != KERN_SUCCESS) {
  65                 *semaphorep = SEMAPHORE_NULL;
  66                 return kr;
  67         }
  68         /* have the port locked */
  69         assert(IP_VALID(kern_port));
  70
  71         if (!ip_active(kern_port) || (ip_kotype(kern_port) != IKOT_SEMAPHORE)) {
  72                 ip_unlock(kern_port);
  73                 *semaphorep = SEMAPHORE_NULL;
  74                 return KERN_INVALID_ARGUMENT;
  75         }
  76
  77         semaphore = (semaphore_t) kern_port->ip_kobject;
  78         assert(semaphore != SEMAPHORE_NULL);
  79         semaphore_reference(semaphore);
  80         ip_unlock(kern_port);
  81
  82         *semaphorep = semaphore;
  83         return KERN_SUCCESS;
  84 }
  85
  86 semaphore_t
  87 convert_port_to_semaphore (ipc_port_t port)
  88 {
  89         semaphore_t semaphore = SEMAPHORE_NULL;
  90
  91         if (IP_VALID (port)) {
  92                 ip_lock(port);
  93                 if (ip_active(port) && (ip_kotype(port) == IKOT_SEMAPHORE)) {
  94                         semaphore = (semaphore_t) port->ip_kobject;
  95                         semaphore_reference(semaphore);
  96                 }
  97                 ip_unlock(port);
  98         }
  99
 100         return (semaphore);
 101 }
 102
 103
 104 ipc_port_t
 105 convert_semaphore_to_port (semaphore_t semaphore)
 106 {
 107         ipc_port_t port;
 108
 109         if (semaphore != SEMAPHORE_NULL)
 110                 port = ipc_port_make_send(semaphore->port);
 111         else
 112                 port = IP_NULL;
 113
 114         return (port);
 115 }
 116
 117 lock_set_t
 118 convert_port_to_lock_set (ipc_port_t port)
 119 {
 120         lock_set_t lock_set = LOCK_SET_NULL;
 121
 122         if (IP_VALID (port)) {
 123                 ip_lock(port);
 124                 if (ip_active(port) && (ip_kotype(port) == IKOT_LOCK_SET)) {
 125                         lock_set = (lock_set_t) port->ip_kobject;
 126                         lock_set_reference(lock_set);
 127                 }
 128                 ip_unlock(port);
 129         }
 130
 131         return (lock_set);
 132 }
 133
 134 ipc_port_t
 135 convert_lock_set_to_port (lock_set_t lock_set)
 136 {
 137         ipc_port_t port;
 138
 139         if (lock_set != LOCK_SET_NULL)
 140                 port = ipc_port_make_send(lock_set->port);
 141         else
 142                 port = IP_NULL;
 143
 144         return (port);
 145 }
 146