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contrib-munin/tools/munin-plugins-busybox/entropy.c
2013-01-28 13:29:19 +01:00

36 lines
1002 B
C

#include <string.h>
#include <stdio.h>
#include "common.h"
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.");
return 0;
}
if(!strcmp(argv[1], "autoconf"))
return writeyes();
}
if(!(f=fopen("/proc/sys/kernel/random/entropy_avail", "r"))) {
fputs("cannot open /proc/sys/kernel/random/entropy_avail\n", stderr);
return 1;
}
if(1 != fscanf(f, "%d", &entropy)) {
fputs("cannot read from /proc/sys/kernel/random/entropy_avail\n", stderr);
fclose(f);
return 1;
}
fclose(f);
printf("entropy.value %d\n", entropy);
return 0;
}