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#include "common.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", global_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));
RRDSET *st = rrdset_find_bytype("system", "entropy");
if(unlikely(!st)) {
st = rrdset_create("system", "entropy", NULL, "entropy", NULL, "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;
}
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