1#include "swap.h"
 2#include "common/debug.h"
 3#include <errno.h>
 4#include <string.h>
 5#include <sys/stat.h>
 6#include <sys/swap.h>
 7#include <limits.h>
 8#include <stdalign.h>
 9
10enum { FFMaxNSwap = 8 };
11
12const char* ffDetectSwap(FFlist* result) {
13    char strings[FFMaxNSwap][PATH_MAX];
14    alignas(swaptbl_t) uint8_t buffer[sizeof(swaptbl_t) + sizeof(swapent_t) * (FFMaxNSwap - 1)] = {};
15    swaptbl_t* table = (swaptbl_t*) buffer;
16    table->swt_n = FFMaxNSwap;
17    for (int i = 0; i < FFMaxNSwap; ++i) {
18        table->swt_ent[i].ste_path = strings[i];
19    }
20
21    int size = swapctl(SC_LIST, table);
22    if (size < 0) {
23        FF_DEBUG("swapctl() failed: %s", strerror(errno));
24        return "swapctl() failed";
25    }
26
27    const uint32_t pageSizeShift = instance.state.platform.sysinfo.pageSizeShift;
28    for (int i = 0; i < size; ++i) {
29        FFSwapResult* swap = FF_LIST_ADD(FFSwapResult, *result);
30        ffStrbufInitS(&swap->name, table->swt_ent[i].ste_path);
31        swap->bytesTotal = (uint64_t) table->swt_ent[i].ste_pages << pageSizeShift;
32        swap->bytesUsed = swap->bytesTotal - ((uint64_t) table->swt_ent[i].ste_free << pageSizeShift);
33    }
34
35    return nullptr;
36}