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36 lines
1002 B
C
36 lines
1002 B
C
#include <string.h>
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#include <stdio.h>
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#include "common.h"
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int entropy(int argc, char **argv) {
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FILE *f;
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int entropy;
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if(argc > 1) {
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if(!strcmp(argv[1], "config")) {
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puts("graph_title Available entropy\n"
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"graph_args --base 1000 -l 0\n"
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"graph_vlabel entropy (bytes)\n"
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"graph_scale no\n"
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"graph_category system\n"
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"graph_info This graph shows the amount of entropy available in the system.\n"
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"entropy.label entropy\n"
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"entropy.info The number of random bytes available. This is typically used by cryptographic applications.");
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return 0;
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}
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if(!strcmp(argv[1], "autoconf"))
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return writeyes();
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}
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if(!(f=fopen("/proc/sys/kernel/random/entropy_avail", "r"))) {
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fputs("cannot open /proc/sys/kernel/random/entropy_avail\n", stderr);
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return 1;
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}
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if(1 != fscanf(f, "%d", &entropy)) {
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fputs("cannot read from /proc/sys/kernel/random/entropy_avail\n", stderr);
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fclose(f);
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return 1;
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}
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fclose(f);
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printf("entropy.value %d\n", entropy);
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return 0;
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}
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