]>
code.delx.au - pulseaudio/blob - src/polypcore/random.c
4 This file is part of polypaudio.
6 polypaudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 polypaudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with polypaudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
34 #include <polypcore/core-util.h>
35 #include <polypcore/log.h>
39 static int has_whined
= 0;
41 static const char *devices
[] = { "/dev/urandom", "/dev/random", NULL
};
43 static int random_proper(void *ret_data
, size_t length
) {
45 assert(ret_data
&& length
);
49 #else /* OS_IS_WIN32 */
55 assert(ret_data
&& length
);
62 if ((fd
= open(*device
, O_RDONLY
)) >= 0) {
64 if ((r
= pa_loop_read(fd
, ret_data
, length
)) < 0 || (size_t) r
!= length
)
76 #endif /* OS_IS_WIN32 */
79 void pa_random_seed(void) {
82 if (random_proper(&seed
, sizeof(unsigned int)) < 0) {
84 pa_log_warn(__FILE__
": failed to get proper entropy. Falling back to seeding with current time.");
87 seed
= (unsigned int) time(NULL
);
93 void pa_random(void *ret_data
, size_t length
) {
97 assert(ret_data
&& length
);
99 if (random_proper(ret_data
, length
) >= 0)
103 pa_log_warn(__FILE__
": failed to get proper entropy. Falling back to unsecure pseudo RNG.");
106 for (p
= ret_data
, l
= length
; l
> 0; p
++, l
--)
107 *p
= (uint8_t) rand();