Small C program to get total physical RAM in FreeBSD

getmem.c

#include <sys/types.h>
#include <sys/sysctl.h>
#include <stdio.h>

uint64_t
get_mem_size()
{
	uint64_t memsize = -1;

	size_t len = sizeof(memsize);
	int name[] = {CTL_HW, HW_PHYSMEM};

	sysctl(name, 2, &memsize, &len, NULL, 0);
	return memsize;
}

int main()
{
	uint64_t mem;
	mem = get_mem_size();
	printf("mem = %lu\n", mem);
	return 0;
}

Compile and run on FreeBSD

cc get_mem_size.c
./a.out