PATTACH_RDONLY
#define PGRAB_RDONLY PATTACH_RDONLY
if (pid == 0 || (pid == getpid() && (flags & PATTACH_RDONLY) == 0))
if ((flags & PATTACH_RDONLY) == 0) {
if ((phdl->flags & PATTACH_RDONLY) != 0)