osfmk/kern/ipc_sync.c

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