1#include "swap.h"
 2#include "common/debug.h"
 3#include "common/sysctl.h"
 4
 5#include <errno.h>
 6#include <string.h>
 7#include <vm/vm_param.h>
 8#include <sys/stat.h>
 9#include <sys/param.h>
10
11static void addSwapEntry(FFlist* result, struct xswdev* xsw, uint32_t pageSizeShift) {
12    if (xsw->xsw_nblks == 0) { // DFBSD reports some /dev/wdog devices with nblks == 0
13        return;
14    }
15
16    FFSwapResult* swap = FF_LIST_ADD(FFSwapResult, *result);
17    if (xsw->xsw_dev == NODEV) {
18        ffStrbufInitStatic(&swap->name, "[NFS]");
19    } else {
20        ffStrbufInitF(&swap->name, "/dev/%s", devname(xsw->xsw_dev, S_IFCHR));
21    }
22    swap->bytesUsed = (uint64_t) xsw->xsw_used << pageSizeShift;
23    swap->bytesTotal = (uint64_t) xsw->xsw_nblks << pageSizeShift;
24}
25
26#if __DragonFly__
27
28const char* ffDetectSwap(FFlist* result) {
29    struct xswdev xsws[32];
30    size_t size = sizeof(xsws);
31    if (sysctlbyname("vm.swap_info_array", xsws, &size, nullptr, 0) < 0) {
32        FF_DEBUG("sysctlbyname(\"vm.swap_info_array\") failed: %s", strerror(errno));
33        return "sysctlbyname(\"vm.swap_info_array\") failed";
34    }
35
36    const uint32_t pageSizeShift = instance.state.platform.sysinfo.pageSizeShift;
37
38    size_t count = size / sizeof(struct xswdev);
39    if (count == 0) {
40        return nullptr;
41    }
42
43    if (xsws->xsw_version != XSWDEV_VERSION) {
44        FF_DEBUG("xswdev version mismatch");
45        return "xswdev version mismatch";
46    }
47
48    for (uint32_t i = 0; i < count; ++i) {
49        addSwapEntry(result, &xsws[i], pageSizeShift);
50    }
51
52    return nullptr;
53}
54
55#elif __FreeBSD__
56
57const char* ffDetectSwap(FFlist* result) {
58    int mib[16];
59    size_t mibsize = ARRAY_SIZE(mib);
60    if (sysctlnametomib("vm.swap_info", mib, &mibsize) < 0) {
61        FF_DEBUG("sysctlnametomib(\"vm.swap_info\") failed: %s", strerror(errno));
62        return "sysctlnametomib(\"vm.swap_info\") failed";
63    }
64
65    const uint32_t pageSizeShift = instance.state.platform.sysinfo.pageSizeShift;
66
67    for (int n = 0;; ++n) {
68        mib[mibsize] = n;
69        struct xswdev xsw;
70        size_t size = sizeof(xsw);
71        if (sysctl(mib, (uint32_t) (mibsize + 1), &xsw, &size, nullptr, 0) < 0) {
72            break;
73        }
74        if (xsw.xsw_version != XSWDEV_VERSION) {
75            FF_DEBUG("xswdev version mismatch");
76            return "xswdev version mismatch";
77        }
78
79        addSwapEntry(result, &xsw, pageSizeShift);
80    }
81
82    return nullptr;
83}
84
85#endif