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      1 /*
      2  * Copyright (C) 2010 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "MachUtilities.h"
     28 
     29 #include <mach/task.h>
     30 
     31 void setMachPortQueueLength(mach_port_t receivePort, mach_port_msgcount_t queueLength)
     32 {
     33     mach_port_limits_t portLimits;
     34     portLimits.mpl_qlimit = queueLength;
     35 
     36     mach_port_set_attributes(mach_task_self(), receivePort, MACH_PORT_LIMITS_INFO, reinterpret_cast<mach_port_info_t>(&portLimits), MACH_PORT_LIMITS_INFO_COUNT);
     37 }
     38 
     39 mach_port_t machExceptionPort()
     40 {
     41     exception_mask_t exceptionMasks[EXC_TYPES_COUNT];
     42     exception_port_t exceptionHandlers[EXC_TYPES_COUNT];
     43     exception_behavior_t exceptionBehaviors[EXC_TYPES_COUNT];
     44     thread_state_flavor_t exceptionFlavors[EXC_TYPES_COUNT];
     45     mach_msg_type_number_t numExceptionMasks;
     46 
     47     kern_return_t kr = task_get_exception_ports(mach_task_self(), EXC_MASK_CRASH, exceptionMasks, &numExceptionMasks, exceptionHandlers, exceptionBehaviors, exceptionFlavors);
     48     if (kr != KERN_SUCCESS) {
     49         ASSERT_NOT_REACHED();
     50         return MACH_PORT_NULL;
     51     }
     52 
     53     // We're just interested in the first exception handler.
     54     return exceptionHandlers[0];
     55 }
     56 
     57 void setMachExceptionPort(mach_port_t exceptionPort)
     58 {
     59     // Assert that we dont try to call setMachExceptionPort more than once per process.
     60 #if !ASSERT_DISABLED
     61     static mach_port_t taskExceptionPort = MACH_PORT_NULL;
     62     ASSERT(taskExceptionPort == MACH_PORT_NULL);
     63     taskExceptionPort = exceptionPort;
     64 #endif
     65 
     66     if (task_set_exception_ports(mach_task_self(), EXC_MASK_CRASH, exceptionPort, EXCEPTION_STATE_IDENTITY | MACH_EXCEPTION_CODES, MACHINE_THREAD_STATE) != KERN_SUCCESS)
     67         ASSERT_NOT_REACHED();
     68 }
     69