libsyscall/mach/mach_eventlink.c

   1 /*
   2  * Copyright (c) 2019 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 #include <mach/boolean.h>
  30 #include <mach/message.h>
  31 #include <mach/kern_return.h>
  32 #include <mach/mach_traps.h>
  33 #include <mach/mach_types.h>
  34 #include <mach/clock_types.h>
  35 #include <mach/mach_eventlink_types.h>
  36
  37 /*
  38  * __mach_eventlink* calls are bsd syscalls instead of mach traps because
  39  * they need to return a 64 bit value in register and mach traps currently
  40  * does not allow 64 bit return values.
  41  */
  42 uint64_t
  43 __mach_eventlink_signal(
  44         mach_port_t         eventlink_port,
  45         uint64_t            signal_count);
  46
  47 uint64_t
  48 __mach_eventlink_wait_until(
  49         mach_port_t                          eventlink_port,
  50         uint64_t                             wait_signal_count,
  51         uint64_t                             deadline,
  52         kern_clock_id_t                      clock_id,
  53         mach_eventlink_signal_wait_option_t  option);
  54
  55 uint64_t
  56 __mach_eventlink_signal_wait_until(
  57         mach_port_t                          eventlink_port,
  58         uint64_t                             wait_count,
  59         uint64_t                             signal_count,
  60         uint64_t                             deadline,
  61         kern_clock_id_t                      clock_id,
  62         mach_eventlink_signal_wait_option_t  option);
  63
  64 kern_return_t
  65 mach_eventlink_signal(
  66         mach_port_t         eventlink_port,
  67         uint64_t            signal_count)
  68 {
  69         uint64_t retval = __mach_eventlink_signal(eventlink_port, signal_count);
  70
  71         return decode_eventlink_error_from_retval(retval);
  72 }
  73
  74 kern_return_t
  75 mach_eventlink_wait_until(
  76         mach_port_t                          eventlink_port,
  77         uint64_t                             *wait_count_ptr,
  78         mach_eventlink_signal_wait_option_t  option,
  79         kern_clock_id_t                      clock_id,
  80         uint64_t                             deadline)
  81 {
  82         uint64_t retval;
  83
  84         retval = __mach_eventlink_wait_until(eventlink_port, *wait_count_ptr,
  85             deadline, clock_id, option);
  86
  87         *wait_count_ptr = decode_eventlink_count_from_retval(retval);
  88         return decode_eventlink_error_from_retval(retval);
  89 }
  90
  91 kern_return_t
  92 mach_eventlink_signal_wait_until(
  93         mach_port_t                          eventlink_port,
  94         uint64_t                             *wait_count_ptr,
  95         uint64_t                             signal_count,
  96         mach_eventlink_signal_wait_option_t  option,
  97         kern_clock_id_t                      clock_id,
  98         uint64_t                             deadline)
  99 {
 100         uint64_t retval;
 101         retval = __mach_eventlink_signal_wait_until(eventlink_port, *wait_count_ptr,
 102             signal_count, deadline, clock_id, option);
 103         *wait_count_ptr = decode_eventlink_count_from_retval(retval);
 104         return decode_eventlink_error_from_retval(retval);
 105 }