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#include <mach/mach_init.h>
#include <mach/vm_map.h>
#include <mach/vm_region.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <stdio.h>

int main() {
    void *mem = malloc(getpagesize() + 15);
    void *ptr = (void *)(((uintptr_t)mem+15) & ~ 0x0F);

    vm_size_t vmsize = getpagesize();
    vm_address_t address = (uintptr_t)ptr / getpagesize() * getpagesize();
    mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT;
    vm_region_basic_info_data_t info;
    vm_region_flavor_t flavor = VM_REGION_BASIC_INFO;
    memory_object_name_t object;
    task_t the_task = mach_task_self();
    kern_return_t kr;

    kr = vm_protect(
        the_task,
        (vm_address_t) address,
        vmsize,
        FALSE,
        VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE);

    if (kr != KERN_SUCCESS)
        printf("vm_protect() failed\n");
    else
        printf("vm_protect() success\n");

    kr = vm_region(
        the_task,
        &address,
        &vmsize,
        VM_REGION_BASIC_INFO,
        &info,
        &info_count,
        &object);

    if (kr != KERN_SUCCESS)
        printf("vm_region() failed\n");
    else
        printf("vm_region() success\n");


    printf("%c%c%c %c%c%c\n",
        (info.protection & VM_PROT_READ)        ? 'r' : '-',
        (info.protection & VM_PROT_WRITE)       ? 'w' : '-',
        (info.protection & VM_PROT_EXECUTE)     ? 'x' : '-',
        (info.max_protection & VM_PROT_READ)    ? 'r' : '-',
        (info.max_protection & VM_PROT_WRITE)   ? 'w' : '-',
        (info.max_protection & VM_PROT_EXECUTE) ? 'x' : '-');
}