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// 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), NULL);
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);
}
rrddim_set_by_pointer(st, rd, entropy);
rrdset_done(st);
return 0;
}
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