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229
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1 #include <stdio.h>
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2 #include <stdlib.h>
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230
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3 #include <sys/time.h>
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229
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4 #include "Random.h"
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370
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5 #define HAS_SRANDOMDEV 1
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229
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6
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7 /**
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230
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8 * /dev/urandom, random から取得した値を seed として使う
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229
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9 */
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10 Random::Random(void)
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11 {
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230
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12 reset();
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229
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13 }
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14
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15 /**
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16 * 引数で seed を指定する
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17 */
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18 Random::Random(unsigned int seed)
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19 {
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20 srandom(seed);
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21 }
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22
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230
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23 void
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24 Random::reset(void)
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25 {
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370
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26 #if HAS_SRANDOMDEV
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230
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27 FILE *fp;
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28 unsigned int seed;
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29 struct timeval tv;
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30
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31 fp = fopen("/dev/urandom", "r");
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32 if (!fp) fp = fopen("/dev/random", "r");
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33
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34 if (fp) {
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35 int res = fread(&seed, sizeof(unsigned int), 1, fp);
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36 if (res != sizeof(unsigned int)) {
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37 fclose(fp);
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38 fp = NULL;
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39 }
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40 }
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41
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42 if (!fp) {
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43 gettimeofday(&tv, NULL);
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44 seed = (tv.tv_sec ^ tv.tv_usec);
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45 } else {
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46 fclose(fp);
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47 }
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48
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49 srandom(seed);
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370
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50 #else
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51 srandomdev();
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52 #endif
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230
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53 }
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54
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370
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55 /*!
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56 1 から 2^(32-1) のランダムな数値を返す。
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57 */
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58
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229
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59 int
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60 Random::getData(void)
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61 {
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62 return random();
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63 }
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