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/**************************************************************************
*
* Copyright 2008 VMware, Inc.
* Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
* 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "c11/threads.h"
#include "eglglobals.h"
#include "egldevice.h"
#include "egldisplay.h"
#include "egldriver.h"
#include "egllog.h"
#ifdef HAVE_MINCORE
#include <unistd.h>
#include <sys/mman.h>
#endif
static mtx_t _eglGlobalMutex = _MTX_INITIALIZER_NP;
struct _egl_global _eglGlobal =
{
.Mutex = &_eglGlobalMutex,
.DisplayList = NULL,
.NumAtExitCalls = 3,
.AtExitCalls = {
/* default AtExitCalls, called in reverse order */
_eglFiniDevice, /* always called last */
_eglUnloadDrivers,
_eglFiniDisplay,
},
.ClientOnlyExtensionString =
"EGL_EXT_client_extensions"
" EGL_EXT_platform_base"
" EGL_KHR_client_get_all_proc_addresses"
" EGL_KHR_debug",
.PlatformExtensionString =
#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
"",
.ClientExtensionString = NULL,
.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);
}
}
const char *
_eglGetClientExtensionString(void)
{
const char *ret;
mtx_lock(_eglGlobal.Mutex);
if (_eglGlobal.ClientExtensionString == NULL) {
size_t clientLen = strlen(_eglGlobal.ClientOnlyExtensionString);
size_t platformLen = strlen(_eglGlobal.PlatformExtensionString);
_eglGlobal.ClientExtensionString = (char *) malloc(clientLen + platformLen + 1);
if (_eglGlobal.ClientExtensionString != NULL) {
char *ptr = _eglGlobal.ClientExtensionString;
memcpy(ptr, _eglGlobal.ClientOnlyExtensionString, clientLen);
ptr += clientLen;
if (platformLen > 0) {
// Note that if PlatformExtensionString is not empty, then it will
// already have a leading space.
assert(_eglGlobal.PlatformExtensionString[0] == ' ');
memcpy(ptr, _eglGlobal.PlatformExtensionString, platformLen);
ptr += platformLen;
}
*ptr = '\0';
}
}
ret = _eglGlobal.ClientExtensionString;
mtx_unlock(_eglGlobal.Mutex);
return ret;
}
EGLBoolean
_eglPointerIsDereferencable(void *p)
{
#ifdef HAVE_MINCORE
uintptr_t addr = (uintptr_t) p;
unsigned char valid = 0;
const long page_size = getpagesize();
if (p == NULL)
return EGL_FALSE;
/* align addr to page_size */
addr &= ~(page_size - 1);
if (mincore((void *) addr, page_size, &valid) < 0) {
_eglLog(_EGL_DEBUG, "mincore failed: %m");
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
return p != NULL;
#endif
}
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