OpenAL32/alError.cpp

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2000 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc.,
  17  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <signal.h>
  24 #include <stdarg.h>
  25
  26 #ifdef HAVE_WINDOWS_H
  27 #define WIN32_LEAN_AND_MEAN
  28 #include <windows.h>
  29 #endif
  30
  31 #include "alMain.h"
  32 #include "alcontext.h"
  33 #include "alError.h"
  34
  35 ALboolean TrapALError = AL_FALSE;
  36
  37 void alSetError(ALCcontext *context, ALenum errorCode, const char *msg, ...)
  38 {
  39     char message[1024]{};
  40
  41     va_list args;
  42     va_start(args, msg);
  43     int msglen{vsnprintf(message, sizeof(message), msg, args)};
  44     va_end(args);
  45
  46     if(msglen < 0 || (size_t)msglen >= sizeof(message))
  47     {
  48         message[sizeof(message)-1] = 0;
  49         msglen = (int)strlen(message);
  50     }
  51     if(msglen > 0)
  52         msg = message;
  53     else
  54     {
  55         msg = "<internal error constructing message>";
  56         msglen = (int)strlen(msg);
  57     }
  58
  59     WARN("Error generated on context %p, code 0x%04x, \"%s\"\n",
  60          context, errorCode, message);
  61     if(TrapALError)
  62     {
  63 #ifdef _WIN32
  64         /* DebugBreak will cause an exception if there is no debugger */
  65         if(IsDebuggerPresent())
  66             DebugBreak();
  67 #elif defined(SIGTRAP)
  68         raise(SIGTRAP);
  69 #endif
  70     }
  71
  72     ALenum curerr{AL_NO_ERROR};
  73     context->LastError.compare_exchange_strong(curerr, errorCode);
  74     if((context->EnabledEvts.load(std::memory_order_relaxed)&EventType_Error))
  75     {
  76         std::lock_guard<std::mutex> _{context->EventCbLock};
  77         ALbitfieldSOFT enabledevts{context->EnabledEvts.load(std::memory_order_relaxed)};
  78         if((enabledevts&EventType_Error) && context->EventCb)
  79             (*context->EventCb)(AL_EVENT_TYPE_ERROR_SOFT, 0, errorCode, msglen, msg,
  80                                 context->EventParam);
  81     }
  82 }
  83
  84 AL_API ALenum AL_APIENTRY alGetError(void)
  85 {
  86     ContextRef context{GetContextRef()};
  87     if(UNLIKELY(!context))
  88     {
  89         constexpr ALenum deferror{AL_INVALID_OPERATION};
  90         WARN("Querying error state on null context (implicitly 0x%04x)\n", deferror);
  91         if(TrapALError)
  92         {
  93 #ifdef _WIN32
  94             if(IsDebuggerPresent())
  95                 DebugBreak();
  96 #elif defined(SIGTRAP)
  97             raise(SIGTRAP);
  98 #endif
  99         }
 100         return deferror;
 101     }
 102
 103     return context->LastError.exchange(AL_NO_ERROR);
 104 }