/************************************************************************** * * Copyright 2008 VMware, Inc. * Copyright 2009-2010 Chia-I Wu * Copyright 2010-2011 LunarG, Inc. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sub license, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. * **************************************************************************/ #include #include #include #include #include "c11/threads.h" #include "eglglobals.h" #include "egldevice.h" #include "egldisplay.h" #include "egldriver.h" #include "util/macros.h" #ifdef HAVE_MINCORE #include #include #endif static mtx_t _eglGlobalMutex = _MTX_INITIALIZER_NP; struct _egl_global _eglGlobal = { .Mutex = &_eglGlobalMutex, .DisplayList = NULL, .DeviceList = &_eglSoftwareDevice, .NumAtExitCalls = 3, .AtExitCalls = { /* default AtExitCalls, called in reverse order */ _eglFiniDevice, /* always called last */ _eglUnloadDrivers, _eglFiniDisplay, }, #if USE_LIBGLVND .ClientOnlyExtensionString = #else .ClientExtensionString = #endif "EGL_EXT_client_extensions" " EGL_EXT_device_base" " EGL_EXT_device_enumeration" " EGL_EXT_device_query" " EGL_EXT_platform_base" " EGL_KHR_client_get_all_proc_addresses" " EGL_KHR_debug" #if USE_LIBGLVND , .PlatformExtensionString = #else " " #endif "EGL_EXT_platform_device" #ifdef HAVE_WAYLAND_PLATFORM " EGL_EXT_platform_wayland" #endif #ifdef HAVE_X11_PLATFORM " EGL_EXT_platform_x11" #endif #ifdef HAVE_DRM_PLATFORM " EGL_MESA_platform_gbm" #endif #ifdef HAVE_SURFACELESS_PLATFORM " EGL_MESA_platform_surfaceless" #endif "", .debugCallback = NULL, .debugTypesEnabled = _EGL_DEBUG_BIT_CRITICAL | _EGL_DEBUG_BIT_ERROR, }; static void _eglAtExit(void) { EGLint i; for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--) _eglGlobal.AtExitCalls[i](); } void _eglAddAtExitCall(void (*func)(void)) { if (func) { static EGLBoolean registered = EGL_FALSE; mtx_lock(_eglGlobal.Mutex); if (!registered) { atexit(_eglAtExit); registered = EGL_TRUE; } assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls)); _eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func; mtx_unlock(_eglGlobal.Mutex); } } EGLBoolean _eglPointerIsDereferencable(void *p) { uintptr_t addr = (uintptr_t) p; const long page_size = getpagesize(); #ifdef HAVE_MINCORE unsigned char valid = 0; if (p == NULL) return EGL_FALSE; /* align addr to page_size */ addr &= ~(page_size - 1); if (mincore((void *) addr, page_size, &valid) < 0) { return EGL_FALSE; } /* mincore() returns 0 on success, and -1 on failure. The last parameter * is a vector of bytes with one entry for each page queried. mincore * returns page residency information in the first bit of each byte in the * vector. * * Residency doesn't actually matter when determining whether a pointer is * dereferenceable, so the output vector can be ignored. What matters is * whether mincore succeeds. See: * * http://man7.org/linux/man-pages/man2/mincore.2.html */ return EGL_TRUE; #else // Without mincore(), we just assume that the first page is unmapped. return addr >= page_size; #endif }