// Timing and RSS helpers for the benchmark.
//
// Allocation profiling is handled by heaptrack (an external LD_PRELOAD
// tool), not by interposing malloc in this target. This avoids fragile
// glibc-version-dependent hook code and the measurement perturbation of
// in-process counting.

#include "include/CBenchSupport.h"

#include <stdio.h>
#include <time.h>

uint64_t bench_rss_kb(void) {
    FILE *f = fopen("/proc/self/statm", "r");
    if (f == NULL) {
        return 0;
    }
    unsigned long total = 0, resident = 0;
    int n = fscanf(f, "%lu %lu", &total, &resident);
    fclose(f);
    if (n != 2) {
        return 0;
    }
    return (uint64_t)resident * 4; // pages -> KiB, assuming 4 KiB pages
}

uint64_t bench_now_ns(void) {
    struct timespec ts;
    clock_gettime(CLOCK_MONOTONIC, &ts);
    return (uint64_t)ts.tv_sec * 1000000000ull + (uint64_t)ts.tv_nsec;
}