Swap (DragonFly): add support

Author: CarterLi

src/detection/swap/swap_bsd.c

@@ -3,6 +3,47 @@
 
 #include <vm/vm_param.h>
 #include <sys/stat.h>
+#include <sys/param.h>
+
+static void addSwapEntry(FFlist* result, struct xswdev* xsw, uint32_t pageSize)
+{
+    if (xsw->xsw_nblks == 0) // DFBSD reports some /dev/wdog devices with nblks == 0
+        return;
+
+    FFSwapResult* swap = ffListAdd(result);
+    if (xsw->xsw_dev == NODEV)
+        ffStrbufInitStatic(&swap->name, "[NFS]");
+    else
+        ffStrbufInitF(&swap->name, "/dev/%s", devname(xsw->xsw_dev, S_IFCHR));
+    swap->bytesUsed = (uint64_t) xsw->xsw_used * pageSize;
+    swap->bytesTotal = (uint64_t) xsw->xsw_nblks * pageSize;
+}
+
+#if __DragonFly__
+
+const char* ffDetectSwap(FFlist* result)
+{
+    struct xswdev xsws[32];
+    size_t size = sizeof(xsws);
+    if (sysctlbyname("vm.swap_info_array", xsws, &size, NULL, 0) < 0)
+        return "sysctlbyname(\"vm.swap_info_array\") failed";
+
+    uint32_t pageSize = instance.state.platform.sysinfo.pageSize;
+
+    size_t count = size / sizeof(struct xswdev);
+    if (count == 0)
+        return NULL;
+
+    if (xsws->xsw_version != XSWDEV_VERSION)
+        return "xswdev version mismatch";
+
+    for (uint32_t i = 0; i < count; ++i)
+        addSwapEntry(result, &xsws[i], pageSize);
+
+    return NULL;
+}
+
+#elif __FreeBSD__
 
 const char* ffDetectSwap(FFlist* result)
 {
@@ -12,7 +53,7 @@ const char* ffDetectSwap(FFlist* result)
         return "sysctlnametomib(\"vm.swap_info\") failed";
 
     uint32_t pageSize = instance.state.platform.sysinfo.pageSize;
-    
+
     for (int n = 0; ; ++n)
     {
         mib[mibsize] = n;
@@ -22,12 +63,11 @@ const char* ffDetectSwap(FFlist* result)
             break;
         if (xsw.xsw_version != XSWDEV_VERSION)
             return "xswdev version mismatch";
-        
-        FFSwapResult* swap = ffListAdd(result);
-        ffStrbufInitF(&swap->name, "/dev/%s", devname(xsw.xsw_dev, S_IFCHR));
-        swap->bytesUsed = (uint64_t) xsw.xsw_used * pageSize;
-        swap->bytesTotal = (uint64_t) xsw.xsw_nblks * pageSize;
+
+        addSwapEntry(result, &xsw, pageSize);
     }
 
     return NULL;
 }
+
+#endif