Code to get mem usage for OSX process

osx_getmem.c

#include <mach/task.h>
int getmem (vm_size_t *rss, vm_size_t *vs)
{
    struct task_basic_info t_info;
    mach_msg_type_number_t t_info_count = TASK_BASIC_INFO_COUNT;
    
    if (KERN_SUCCESS != task_info(mach_task_self(),
                                  TASK_BASIC_INFO, (task_info_t)&t_info, &t_info_count))
    {
        return -1;
    }
    *rss = t_info.resident_size;
    *vs  = t_info.virtual_size;
    return 0;
}