MAP_PREFAULT_READ
MAP_PREFAULT_READ, fd, data_offset) == MAP_FAILED) {
hdr = mmap(NULL, page_size, PROT_READ, MAP_PRIVATE | MAP_PREFAULT_READ,
MAP_PRIVATE | MAP_PREFAULT_READ, fd, hdr->e_phoff);
} else if (flags & MAP_PREFAULT_READ)
MAP_PREFAULT_READ | MAP_GUARD | MAP_32BIT |
MAP_PREFAULT_READ, fd, 0);
#ifndef MAP_PREFAULT_READ
#ifdef MAP_PREFAULT_READ
flags |= MAP_PREFAULT_READ;
#if defined(MAP_PREFAULT_READ)
flags |= MAP_PREFAULT_READ;