#include <cmath>#include <ctime>#include <cstdio>#include <sys/time.h>#include "randnum.h"Include dependency graph for randnum.cpp:

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Functions | |
| unsigned long int | random_seed () |
| Generate a random seed from /dev/random if available. | |
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Generate a random seed from /dev/random if available. if no /dev/random, generate the seed from current time in milli-second
Definition at line 58 of file randnum.cpp. 00059 {
00060 unsigned int seed;
00061 struct timeval tv;
00062 FILE *devrandom;
00063
00064 if ((devrandom = fopen("/dev/urandom","r")) == NULL) {
00065 gettimeofday(&tv,0);
00066 seed = tv.tv_sec + tv.tv_usec;
00067 //printf("Got seed %u from gettimeofday()\n",seed);
00068 }
00069 else {
00070 fread(&seed,sizeof(seed),1,devrandom);
00071 //printf("Got seed %u from /dev/random\n",seed);
00072 fclose(devrandom);
00073 }
00074
00075 return seed;
00076 }
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1.3.9.1