added available entropy

[netdata.git] / src / proc_sys_kernel_random_entropy_avail.c

diff --git a/src/proc_sys_kernel_random_entropy_avail.c b/src/proc_sys_kernel_random_entropy_avail.c
new file mode 100755 (executable)
index 0000000..cb6154b
--- /dev/null
+++ b/src/proc_sys_kernel_random_entropy_avail.c
@@ -0,0 +1,34 @@
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "config.h"
+#include "procfile.h"
+#include "rrd.h"
+#include "plugin_proc.h"
+
+int do_proc_sys_kernel_random_entropy_avail(int update_every, unsigned long long dt) {
+       static procfile *ff = NULL;
+
+       if(dt) {} ;
+
+       if(!ff) ff = procfile_open("/proc/sys/kernel/random/entropy_avail", "", PROCFILE_FLAG_DEFAULT);
+       if(!ff) return 1;
+
+       ff = procfile_readall(ff);
+       if(!ff) return 0; // we return 0, so that we will retry to open it next time
+
+       unsigned long long entropy = strtoull(procfile_lineword(ff, 0, 0), NULL, 10);
+
+       RRDSET *st = rrdset_find_bytype("system", "entropy");
+       if(!st) {
+               st = rrdset_create("system", "entropy", NULL, "system", "Available Entropy", "entropy", 1000, update_every, RRDSET_TYPE_LINE);
+               rrddim_add(st, "entropy", NULL, 1, 1, RRDDIM_ABSOLUTE);
+       }
+       else rrdset_next(st);
+
+       rrddim_set(st, "entropy", entropy);
+       rrdset_done(st);
+
+       return 0;
+}