#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"
+
+#include "util/macros.h"
+
+#ifdef HAVE_MINCORE
+#include <unistd.h>
+#include <sys/mman.h>
+#endif
static mtx_t _eglGlobalMutex = _MTX_INITIALIZER_NP;
struct _egl_global _eglGlobal =
{
- &_eglGlobalMutex, /* Mutex */
- NULL, /* DisplayList */
- 2, /* NumAtExitCalls */
- {
+ .Mutex = &_eglGlobalMutex,
+ .DisplayList = NULL,
+ .DeviceList = &_eglSoftwareDevice,
+ .NumAtExitCalls = 3,
+ .AtExitCalls = {
/* default AtExitCalls, called in reverse order */
- _eglUnloadDrivers, /* always called last */
- _eglFiniDisplay
+ _eglFiniDevice, /* always called last */
+ _eglUnloadDrivers,
+ _eglFiniDisplay,
},
- /* ClientExtensionString */
+ .ClientOnlyExtensionString =
"EGL_EXT_client_extensions"
+ " EGL_EXT_device_base"
+ " EGL_EXT_device_enumeration"
+ " EGL_EXT_device_query"
" EGL_EXT_platform_base"
- " EGL_EXT_platform_wayland"
- " EGL_EXT_platform_x11"
" EGL_KHR_client_get_all_proc_addresses"
- " EGL_MESA_platform_gbm",
+ " EGL_KHR_debug",
- NULL, /* debugCallback */
- _EGL_DEBUG_BIT_CRITICAL | _EGL_DEBUG_BIT_ERROR, /* debugTypesEnabled */
+ .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,
};
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
+}