State Queries - Praise for OpenGL ES 30 Programming Guide - page 443

GL_ANY_SAMPLES_PASSED_CONSERVATIVE, or
GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN
specifies the query object parameter to be retrieved;
must be GL_CURRENT_QUERY
specifies an array of the appropriate type for storing the
returned parameter values

pname

params

The state of a query object can be retrieved by calling the following function:

void glGetQueryObjectuiv (GLuint id , GLenum pname ,

GLuint * params )

specifies the name of a query object
specifies the query object parameter to be retrieved;
can be GL_QUERY_RESULT or GL_QUERY_RESULT_AVAILABLE
specifies an array of the appropriate type for storing the
returned parameter values

id
pname

params

Sync Object Queries

The properties of a sync object can be retrieved from the current OpenGL
ES 3.0 context by calling the following function:

void glGetSynciv (GLsync sync , GLenum pname ,

GLsizei bufsize , GLsizei * length ,

GLint * values )

specifies the sync object to query
specifies the parameter to retrieve from the sync object

sync
pname

the number of bytes available in the returning values
the address of the returned number of bytes in values
specifies the address of an array for the returned parameter

bufsize
length
values