freebsd branch: swap plugin: Use `sysctlnametomib' to query the mib if we don't know it.

Maybe this should be the default?

diff --git a/src/swap.c b/src/swap.c
index 7dd8d68..1d284f3 100644 (file)
--- a/src/swap.c
+++ b/src/swap.c
@@ -215,16 +215,29 @@ static void swap_read (void)
 /* #endif HAVE_LIBKSTAT */
 
 #elif HAVE_SYS_SYSCTL_H
-       int mib[2];
+       int              mib[3];
+       size_t           mib_len;
        struct xsw_usage sw_usage;
        size_t           sw_usage_len;
+       int              status;
 
-       mib[0] = CTL_VM;
-       mib[1] = VM_SWAPUSAGE;
+#if defined(VM_SWAPUSAGE)
+       mib_len = 2;
+       mib[0]  = CTL_VM;
+       mib[1]  = VM_SWAPUSAGE;
+#else
+       mib_len = 3;
+       if ((status = sysctlnametomib ("vm.swap_info", mib, &mib_len)) < 0)
+       {
+               syslog (LOG_WARN, "swap plugin: sysctlnametomib failed: %s",
+                               strerror (errno));
+               return;
+       }
+#endif
 
        sw_usage_len = sizeof (struct xsw_usage);
 
-       if (sysctl (mib, 2, &sw_usage, &sw_usage_len, NULL, 0) != 0)
+       if (sysctl (mib, mib_len, &sw_usage, &sw_usage_len, NULL, 0) != 0)
                return;
 
        /* The returned values are bytes. */