sbrk
void *sbrk(intptr_t);
extern char *sbrk(intptr_t);
if ((base = sbrk(incr)) == (char *)-1)
xtra = (PAGE_SIZE - (vm_offset_t)sbrk(0)) & PAGE_MASK;
*basep = (vm_offset_t)sbrk(xtra + bytes) + xtra;
struct sbrk_args sbrk;
brk = sbrk(0);
nbrk = sbrk(0);
printf("BRK(0)=%x ",sbrk(0));
printf("BRK(1)=%x ",sbrk(0));
sbrk(0),NOPS,NBUCKETS,NSIZE);