sevent
const struct sevent *as = a;
const struct sevent *bs = b;
static bool pmu_alias_is_duplicate(struct sevent *a, struct sevent *b)
struct sevent *aliases;
struct sevent *s;
struct sevent *aliases;
aliases = calloc(len, sizeof(struct sevent));
qsort(aliases, len, sizeof(struct sevent), cmp_sevent);