mirror of
https://github.com/munin-monitoring/contrib.git
synced 2018-11-08 00:59:34 +01:00
38 lines
1 KiB
C
38 lines
1 KiB
C
#include <string.h>
|
|
#include <stdio.h>
|
|
#include "common.h"
|
|
|
|
#define ENTROPY_AVAIL "/proc/sys/kernel/random/entropy_avail"
|
|
|
|
int entropy(int argc, char **argv) {
|
|
FILE *f;
|
|
int entropy;
|
|
if(argc > 1) {
|
|
if(!strcmp(argv[1], "config")) {
|
|
puts("graph_title Available entropy\n"
|
|
"graph_args --base 1000 -l 0\n"
|
|
"graph_vlabel entropy (bytes)\n"
|
|
"graph_scale no\n"
|
|
"graph_category system\n"
|
|
"graph_info This graph shows the amount of entropy available in the system.\n"
|
|
"entropy.label entropy\n"
|
|
"entropy.info The number of random bytes available. This is typically used by cryptographic applications.");
|
|
print_warncrit("entropy");
|
|
return 0;
|
|
}
|
|
if(!strcmp(argv[1], "autoconf"))
|
|
return writeyes();
|
|
}
|
|
if(!(f=fopen(ENTROPY_AVAIL, "r"))) {
|
|
fputs("cannot open " ENTROPY_AVAIL "\n", stderr);
|
|
return 1;
|
|
}
|
|
if(1 != fscanf(f, "%d", &entropy)) {
|
|
fputs("cannot read from " ENTROPY_AVAIL "\n", stderr);
|
|
fclose(f);
|
|
return 1;
|
|
}
|
|
fclose(f);
|
|
printf("entropy.value %d\n", entropy);
|
|
return 0;
|
|
}
|