INNER CODE UNIT · C
q
lh3/ksw2 · kalloc.c:141
q = (size_t*)kmalloc(km, n_bytes);
memcpy(q, ap, (*p - 1) * sizeof(size_t));
kfree(km, ap);
return q;
}
void *kmalloc(void *_km, size_t n_bytes)
{
kmem_t *km = (kmem_t*)_km;
size_t n_units, *p, *q;
if (n_bytes == 0) return 0;
if (km == 0) return malloc(n_bytes);
/* "n_units" means the number of units. The size of one unit equals to sizeof(kheader_t).
* "1" is the kheader_t of a block, which is always required. */
n_units = 1 + (n_bytes + sizeof(size_t) - 1) / sizeof(size_t);
if (n_units&1) ++n_units; /* make n_units an even number, or it will segfault if only one unit remains */