summaryrefslogtreecommitdiffstats
path: root/collectors/proc.plugin/proc_sys_kernel_random_entropy_avail.c
diff options
context:
space:
mode:
Diffstat (limited to 'collectors/proc.plugin/proc_sys_kernel_random_entropy_avail.c')
-rw-r--r--collectors/proc.plugin/proc_sys_kernel_random_entropy_avail.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/collectors/proc.plugin/proc_sys_kernel_random_entropy_avail.c b/collectors/proc.plugin/proc_sys_kernel_random_entropy_avail.c
new file mode 100644
index 000000000..20d2116ce
--- /dev/null
+++ b/collectors/proc.plugin/proc_sys_kernel_random_entropy_avail.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "plugin_proc.h"
+
+int do_proc_sys_kernel_random_entropy_avail(int update_every, usec_t dt) {
+ (void)dt;
+
+ static procfile *ff = NULL;
+
+ if(unlikely(!ff)) {
+ char filename[FILENAME_MAX + 1];
+ snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/sys/kernel/random/entropy_avail");
+ ff = procfile_open(config_get("plugin:proc:/proc/sys/kernel/random/entropy_avail", "filename to monitor", filename), "", PROCFILE_FLAG_DEFAULT);
+ if(unlikely(!ff)) return 1;
+ }
+
+ ff = procfile_readall(ff);
+ if(unlikely(!ff)) return 0; // we return 0, so that we will retry to open it next time
+
+ unsigned long long entropy = str2ull(procfile_lineword(ff, 0, 0));
+
+ static RRDSET *st = NULL;
+ static RRDDIM *rd = NULL;
+
+ if(unlikely(!st)) {
+ st = rrdset_create_localhost(
+ "system"
+ , "entropy"
+ , NULL
+ , "entropy"
+ , NULL
+ , "Available Entropy"
+ , "entropy"
+ , PLUGIN_PROC_NAME
+ , "/proc/sys/kernel/random/entropy_avail"
+ , NETDATA_CHART_PRIO_SYSTEM_ENTROPY
+ , update_every
+ , RRDSET_TYPE_LINE
+ );
+
+ rd = rrddim_add(st, "entropy", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
+ }
+ else rrdset_next(st);
+
+ rrddim_set_by_pointer(st, rd, entropy);
+ rrdset_done(st);
+
+ return 0;
+}