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This commit is contained in:
Helmut Grohne 2008-06-21 11:33:06 +00:00 • committed by Steve Schnepp
parent 0cde2ae787
commit 209937078b
15 changed files with 737 additions and 0 deletions
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35
tools/munin-plugins-busybox/entropy.c Normal file
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#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;
}