void glGetObjectPtrLabel(void * ptr, GLsizei bufSize, GLsizei * length, char * label);
label is the address of a string that will be used to store the object label. bufSize specifies the number of characters in the array identified by label. length contains the address of a variable which will receive the number of characters in the object label. If length is NULL, then it is ignored and no data is written. Likewise, if label is NULL, or if bufSize is zero then no data is written to label.
GL_INVALID_VALUE is generated if ptr is not the name of an existing sync object.
GL_INVALID_VALUE is generated if bufSize is zero.
If not NULL, length and label should be addresses to which the client has write access, otherwise undefined behavior, including process termination may occur.
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