Mercurial > hg > mlmmj
view src/random-int.c @ 486:89a256e8f1d3
read() wrapper, and yet another littering hole plunged
author | mmj |
---|---|
date | Tue, 03 May 2005 03:39:11 +1000 |
parents | 3f177909efc8 |
children | 793e5b2b28f2 |
line wrap: on
line source
/* Copyright (C) 2002, 2003 Mads Martin Joergensen <mmj at mmj.dk> * * $Id$ * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to * deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or * sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #include <fcntl.h> #include <stdlib.h> #include <unistd.h> #include <time.h> #include "wrappers.h" int random_int() { unsigned int seed; int devrandom; unsigned char ch; seed = (unsigned int)time(NULL); devrandom = open("/dev/urandom", O_RDONLY); if(devrandom < 0) devrandom = open("/dev/random", O_RDONLY); if (devrandom >= 0) { readn(devrandom, &ch, 1); seed ^= ch; readn(devrandom, &ch, 1); seed ^= ch << 8; readn(devrandom, &ch, 1); seed ^= ch << 16; readn(devrandom, &ch, 1); seed ^= ch << 24; close(devrandom); } srand(seed); return rand(); } #if 0 int main(int argc, char **argv) { int i; for(i = 0; i < 25; i++) printf("%i\n", random_int()); return 0; } #endif